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  1. #41
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by ralphie_43 View Post
    Hey man so the max is 16,000 rpm

    Sent from my SM-G930V using Audizine mobile app
    Sweet so I’m just barely under max speed haha... I’ve spent forever trying to find a definite answer to that, thanks haha!

  2. #42
    Quote Originally Posted by b7_Andy View Post
    Sweet so I’m just barely under max speed haha... I’ve spent forever trying to find a definite answer to that, thanks haha!
    What size pulley you running?


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  3. #43
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Calderfer2665 View Post
    What size pulley you running?


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    2.8” pulley on the supercharger

  4. #44
    Veteran Member Four Rings GrapeBandit's Avatar
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    How did out figure your SC is at max rpm while only pushing 7.5psi? Like what formula did you use? Seems off because the m62 is good to around 15psi
    r.i.p.CASABLANCA B5 1.8t
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  5. #45
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by GrapeBandit View Post
    How did out figure your SC is at max rpm while only pushing 7.5psi? Like what formula did you use? Seems off because the m62 is good to around 15psi
    I divided the crankshaft pulley diameter by the supercharger pulley diameter to get the number of rotations the supercharger makes per rotation of the crankshaft then multiplied by my redline (6800 rpm). It’s not all about boost, it’s really mass airflow that’s important. The MP62 will make twice as much boost on Miatas that have a 1.6 and much smaller intake ports because air spends more time between the supercharger and the cylinders getting pressurized. The 2.8 can flow way more air because more cylinders, bigger intake ports, and the PES manifold has pretty big ports too so the air flows faster into the cylinders before it can reach really high pressures.

  6. #46
    That’s why I asked as well? I’am running the smaller pulley and it’s about 10-11psi with no problems?


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  7. #47
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Calderfer2665 View Post
    That’s why I asked as well? I’am running the smaller pulley and it’s about 10-11psi with no problems?


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    What elevation do you drive at? I know at sea level this pulley should make 10psi. Unlike turbo setups or even the supercharger in the B8s, boost isn’t regulated with this kit so your peak boost is pretty much whatever your blower can put out at redline. So boost is directly related to pre-supercharger air pressure. I live 6,000 ft above sea level and peak at 7.5 psi... when I drive through the Eisenhower tunnel at 12,000 ft above sea level I can only reach about 6 psi at redline. So I figure at sea level I’d probably peak at 9 psi which means I’m losing about 1 psi for all the hacking I did to my supercharger.

  8. #48
    Veteran Member Four Rings GrapeBandit's Avatar
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    Quote Originally Posted by b7_Andy View Post
    I divided the crankshaft pulley diameter by the supercharger pulley diameter to get the number of rotations the supercharger makes per rotation of the crankshaft then multiplied by my redline (6800 rpm). It’s not all about boost, it’s really mass airflow that’s important. The MP62 will make twice as much boost on Miatas that have a 1.6 and much smaller intake ports because air spends more time between the supercharger and the cylinders getting pressurized. The 2.8 can flow way more air because more cylinders, bigger intake ports, and the PES manifold has pretty big ports too so the air flows faster into the cylinders before it can reach really high pressures.
    So are you saying the m62 cant produce 1 bar on a 2.8 v6?

    Its going to produce 1 bar on my mercedes 2.3L 4cyl(only 6,000 redline)when I get it back from the machine shop. Not much smaller than your engine and lower redline.
    r.i.p.CASABLANCA B5 1.8t
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    PCV? Just dump it on the ground!

  9. #49
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by GrapeBandit View Post
    So are you saying the m62 cant produce 1 bar on a 2.8 v6?

    Its going to produce 1 bar on my mercedes 2.3L 4cyl(only 6,000 redline)when I get it back from the machine shop. Not much smaller than your engine and lower redline.
    It’d probably make 1 bar if it was a 4 cylinder or if I had 2.7 heads and a manifold similar to a 2.7 manifold because the airflow would be more restricted so it’d build up pressure faster. But that wouldn’t make much sense because it wouldn’t be putting air into the engine any faster. Horsepower isn’t all about boost, air pressure is only consistent with the volume of your intake system, port sizing in the heads and engine displacement. Smaller intake volume=more pressure but less flow. Making a ton of boost is good for power, but there’s guys with corvettes that are making almost 1,000 hp on 12 psi because 12psi in their giant intake system is actually moving waaaaaay more air than like 30 psi in a 4 cylinder.

  10. #50
    Veteran Member Four Rings Joe Jr.'s Avatar
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    sounds like a fun car. I'd like to see it sometime. Do you do any of the meets with the guys and the rocky mountain Quattros? I haven't just because it seems like its mostly about new cars and RS cars etc.
    Need another!

  11. #51
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Joe Jr. View Post
    sounds like a fun car. I'd like to see it sometime. Do you do any of the meets with the guys and the rocky mountain Quattros? I haven't just because it seems like its mostly about new cars and RS cars etc.
    I used to go to a lot of Denver Audi meets in the past. I haven’t been to any in a while mainly because I’ve been so busy with school and work, but I’d be down to go to a Rocky Mountain quattros meet sometime. They’ve got their next one like the 20th right? It does seem like all fancy Audi’s that go though, I’d have to hide mine in the back corner or something haha

  12. #52
    Veteran Member Four Rings Joe Jr.'s Avatar
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    yeah now that you say that. i saw that they are doing something on the 20th. I was at the Lafayette cars n coffee last Saturday. it was a good day for it. Lots of cars out.
    Need another!

  13. #53
    Established Member Two Rings BonusParts's Avatar
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    Quote Originally Posted by b7_Andy View Post
    What elevation do you drive at? I know at sea level this pulley should make 10psi. Unlike turbo setups or even the supercharger in the B8s, boost isn’t regulated with this kit so your peak boost is pretty much whatever your blower can put out at redline. So boost is directly related to pre-supercharger air pressure. I live 6,000 ft above sea level and peak at 7.5 psi... when I drive through the Eisenhower tunnel at 12,000 ft above sea level I can only reach about 6 psi at redline. So I figure at sea level I’d probably peak at 9 psi which means I’m losing about 1 psi for all the hacking I did to my supercharger.
    He's at sea level.

    Good numbers, thats about what the standard 6psi 3.xx pulley does at sea level.

    I kinda miss mine a bit

    BY the way, did you want to maybe switch to Coil on Plug? I have a harness I made for mine, then never used and sold the car...
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  14. #54
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by BonusParts View Post
    He's at sea level.

    Good numbers, thats about what the standard 6psi 3.xx pulley does at sea level.

    I kinda miss mine a bit

    BY the way, did you want to maybe switch to Coil on Plug? I have a harness I made for mine, then never used and sold the car...
    Like a B7 style coil conversion?

  15. #55
    Active Member One Ring
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    Hey Andy, what size belt do you have match with your 2.8 pulley on the G2? I'm using a 6pk 1970, Feels a little lose.

  16. #56
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Kefe8302 View Post
    Hey Andy, what size belt do you have match with your 2.8 pulley on the G2? I'm using a 6pk 1970, Feels a little lose.
    Looks like I ordered a 1968.5 mm belt. The continental part number is 4060775.

  17. #57
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    Much appreciated. Thanks for this build write up by the way. It gave me the confidence to install my AEM fuel pump.

  18. #58
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Kefe8302 View Post
    Much appreciated. Thanks for this build write up by the way. It gave me the confidence to install my AEM fuel pump.
    No problem, much more to come with the write up when I finally get around to doing it lol

  19. #59
    Veteran Member Four Rings b7_Andy's Avatar
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    So last week I took a road trip through Scottsdale, AZ and then to Park City, UT to ski and then back to Denver. Total trip was 2,300 miles and the car somehow didn’t breakdown Scottsdale is about 1,500 ft above sea level so I was making about 8.5 psi while I was there and man did the car haul ass! I did find another rebuilt rotor pack for sale on eBay that I’m thinking I’ll get for this supercharger so I can have fresh rotors. I’m pretty sure the boost I’m losing is from how beat up the rotors are and all the material I took off of them from resurfacing. I think with new rotors I could probably get 2 psi back which would maybe translate to like 30 hp lol. I will update if/when I swap the rotor pack.

  20. #60
    Veteran Member Four Rings Joe Jr.'s Avatar
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    cool picture! I was just there in November and going back again in March. I was debating taking my b5, and i think i decided against it. lol. but yeah its amazing when you leave Colorado and go somewhere with air how you notice the extra power the car has.
    Need another!

  21. #61
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Joe Jr. View Post
    cool picture! I was just there in November and going back again in March. I was debating taking my b5, and i think i decided against it. lol. but yeah its amazing when you leave Colorado and go somewhere with air how you notice the extra power the car has.
    It makes such a difference, I wish I could see how much power my 3.2 B7 has at sea level.

  22. #62
    Veteran Member Four Rings b7_Andy's Avatar
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    Well I sliced my finger open and can't work for a couple days so I finally got the free time I needed to update this thread lol. All the DIY stuff I did is now covered in the first two posts if anyone wants to see. It's been around 5,000 miles that I've been driving this setup and so far I'm still really happy with it and haven't run into any big issues. Here's some of my future planning for the car...

    -Rebuild the supercharger with a new rotor pack in hopes to get to 9 psi at altitude.
    -Get an E85 tune made for the car, hopefully before summer when it starts getting real hot again.
    -Redo a lot of the exhaust... I plan on getting an XS-Power twin 2 B5 S4 catback and modifying my downpipes again. I don't like having the flex pipes at the lowest point of the car, so I want to relocate them to the downward section of the downpipes like how they are in the B7s. I also want to add interchangeable cats/test pipes with V-bands to the last flat section of the downpipes so I can switch out cats or test pipes in a matter of minutes for having to pass emissions or whatnot. Currently I'm running the stock catback which is literally just rotting. My exhaust also reduces from dual 2.5" to dual 2" to single 2.36" so from beginning to end I'm getting a 60% reduction in flow area which combined with the rotting catback makes these car sound awful. It's raspy as hell haha
    -Convert my front suspension to B7 suspension. I have a spare set of stock B7 front coilovers with 55,000 miles on them and B7 spindles. This way I'll have 1,000 more brake options so I can actually put decent brakes on this car and the suspension should ride a little nicer.

  23. #63
    Veteran Member Four Rings Joe Jr.'s Avatar
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    wow, you've been driving the thing alot. I barely put 4k on my car last year. I really like running the e85 in the summer also, and its definitely a power boost. I like the plans for updating the suspension. I spent most of last year getting the suspension on mine sorted...new 034 control arms, shocks/springs, engine mounts...ect.
    Need another!

  24. #64
    Veteran Member Four Rings b7_Andy's Avatar
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    Ya half the miles were from the road trip haha... and and yes motor mounts! My stock 3.2 mounts that I put in there have gotten destroyed since it’s been supercharged so I definitely need some good motor mounts in there.

  25. #65
    Veteran Member Four Rings b7_Andy's Avatar
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    Well I went out last night in the wagon with my buddy driving my B7 A4 3.2 to race the two cars because I’ve wanted to see if the wagon is faster or not. I had a GoPro on the side of the car and somehow all the video files are corrupted and it didn’t record anything The cars are almost the exact same speed. Every pull both cars pretty much held doors. Up high like 3rd-4th the wagon would pull a little bit on certain races. I’m going to have to try and get videos again... But anyway I have the rebuilt rotor pack with some extra goodies ready to go in. I’ll update this when that all gets installed and I see what kind of power I’m making. I also did the B7 spindle and brake conversion. I’m still trying to decide what kind of brakes I’m going to go with, but I’ll have more information on that later. Just figured I’d give a little update.

  26. #66
    Veteran Member Four Rings Joe Jr.'s Avatar
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    sounds like fun.
    Need another!

  27. #67
    Veteran Member Four Rings b7_Andy's Avatar
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    Been a while since I updated this thread, just passed 202,000 miles and still running solid! So I ended up rebuilding the supercharger again with a new rotorpack from a Cobalt SS supercharger. The rotor blades were the exact same, but the bearing shafts on the new rotors were about 7 mm longer than the old rotors.



    This meant the needle bearings in the back of the supercharger had to be recessed further down for the new rotors to work. So back to hacking everything up again... This is probably not the way to go about it, but I made do with the tools I had and about 8,000 miles later the supercharger is still running strong. I got a giant ass drill bit 1/64" smaller than the diameter of the bore where the needle bearings press into, and drilled the two holes a few mm deeper. When I reached the depth I needed, I then swept the holes by hand with a circular sanding bit on a Dremel until the bore of the holes got back to the press-fit tolerance. Miraculously I drilled the holes straight and the new bearings pressed in snug and now sit deep enough for the new rotors. And, everything still turned smooth! While I had the supercharger in pieces I removed the stock air temp sensor I had fitted in the manifold, and re-drilled and tapped the hole for an aftermarket air temp sensor that can go up to 300 ºF. I also replaced the shaft seal on the supercharger snout and reassembled the supercharger with a silicone sealer designed for gear oil (the red anaerobic stuff did not seal very well the first time around and I had multiple leaks).







    I also made a custom air intake, which actually made a noticeable boost increase on the low end of the powerband. With the throttle pointing right up against the false firewall there's not a lot of room to wrap a 3" intake around so I used what's called a cobra head coupler.





    For the intake temp sensor I welded a 2" x 1" x 1/2" piece of scrap aluminum to the intake tube and drilled a hole straight through it and drilled and tapped the M6 bolt thread. I also added a bung to thread a barb into for the PCV hose and I also welded in a bung for my cold side air temp sensor. One thing I noticed is that due to the location of the intake and temp sensor in this car, when the engine shuts off, all the heat from the downpipes rises up and heats up the intake tube. So when I start the car within an hour after I've been driving it, the intake air temp will read 120-150 ºF, which causes the AFR to be kind of lean until it figures out what's going on. I heat wrapped the aluminum intake tube too hoping it would help, but it still gets too hot. This also happened with the stock intake, so there's really not much that can be done, just a poor location for an intake temp sensor.





    Now that I have cold and hot side aftermarket temp sensor locations, I was able to install my dual intake temp gauge in the driver side air vent.



    For anyone that's curious, I typically see hot-side temps between 180 ºF and 220 ºF when I'm street racing at night and it's a little cooler, and the hottest I've seen it get was 240 ºF when I was hillclimbing this summer on a 100º day. I know I'm nearing the max temp you can be at with pump fuel, but I haven't had any issues yet. I'd like to be able to use an aftercooler like this: https://mercracing.net/shop/ct-engin...charge-cooler/. I would either need to cast a new manifold or make an adapter plate that would probably be too big to work on this car... maybe one day.

    Oh I almost forgot, here's a before and after of the supercharger boost... The rebuild got close to 2 psi of boost back just by having clean rotors.



    It's hard to compare all the new data to the first log I made because it was freezing cold the first time I logged power, MAF, and timing after the initial install. Even though the boost is a lot higher, I only gained a few g/s of MAF, which is weird. I also found out that this car depends a lot on the intake temperature. The timing advance will change as much as 6-7 degrees based on the temps and the power and torque will change as much as 20 hp/tq depending on the time of year.

    Some other things I've done since the last update are 18Z brakes, all 4 wheel bearings, B7 spindles then B5 S4 spindles, adjustable coilovers, had to replace the heater core, got 4 new S4 facelift doors (I've now replaced 7 panels on this car), black roof rails, and fixed the long cranking issue. I first had B7 aluminum spindles which did work, but they widened the track width just enough to destroy my inner axle boots in a few thousand miles. I'll probably go back to B7 spindles when I swap my spare 0A3 into the car because then I'll be using B7 axles and everything will be the right dimensions (since I hate the 01E and there's no way it lasts another season of street racing). To do B7 spindles all the control arms are the same except for the lower straight arm. The balljoint is a different size so you have to use a B7 control arm with a B5 shock bottom bushing. The ABS sensor also fits perfect in the bore if you use the same sleeve from your B5 spindles. Anyway, I'm just running B5 S4 spindles now and all the suspension parts and axles are happy.





    For the doors everything was super quick except for the driver's door. The facelift doors have a new style door handle on the inside too, which created a problem because I still need to use the key in the door. There's no way to swap just the lock over to the newer door handle, so I had to cut up the two door handle/lock assemblies and bond them together. They're made of indium or tin and have a melting point under 400 ºF so they can't be fused or brazed, which means the only option is to use JB weld. It took a long ass time, but it worked and hasn't broken yet.







    Heater core job wasn't too bad besides all my wiring I had to move around for the aftermarket gauges.



    And the long cranking issue I've had for probably a year and a half now was the simplest thing ever. I guess AEM fuel pumps don't come with built-in check valves so I installed an in-line check valve with some standard 5/16" fuel line hose right above the outlet of the fuel pump and now the car starts up every time. This is the check valve I used: https://www.highflowfuel.com/i-23908...-8mm-5-16.html.

    And that's about everything I can think of since the last update!


  28. #68
    Veteran Member Four Rings b7_Andy's Avatar
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    So as far as what's planned down the road for this car, I definitely think it'd be a perfect car to test a twin-charged setup on. Mechanically I'm confident I could make it happen and have everything fit. I would plan for a single turbo right where the battery sits (with the false firewall cut out), and if I used a smaller coolant reservoir and had the intake feed the throttle behind the supercharger from the driver side, it could all fit. The biggest thing holding me back is the tuning. What I've figured out is the ME5.9.2 ECUs in the early B5 A4s are worthless. I want to use a standalone ECU to control just the fueling, ignition, and boost, but I imagine I'd still have to program the stock ECU to turn off the injector cycles and ignition, and I don't think I have any chance of writing a ME5 ECU. Apparently you can write these ECUs, but you can't read them, which is weird as hell. I took apart my spare ECU and it doesn't have any read pins for my bench flashing tool. I've talked to two tuners that are confident they can make a twin charged tune if I convert the ECU and wiring to a 2.7 S4 setup. I'd need a 2.7 throttle body, throttle pedal with wiring, all the engine sensors that are different, 2.7 ignition components, the whole 2.7 wiring harness and ECU, and then I don't know how I'd re-pin the chassis side of the harness. Seems like converting to ME7 is the only way this car gets any further, but it would probably almost be easier to swap the supercharger over to an S4, and then build off that car... if S4's hadn't gotten so damn expensive, let alone I haven't found a single wagon for sale near me. I'll see what else I can find out about tuning a setup like that, but I'd definitely like to convert this to a twin charged setup one day.

  29. #69
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    Awesome thread, I enjoyed the read and insanely large pictures!

    Serious question: Have you considered Megasquirt for standalone?

  30. #70
    Veteran Member Four Rings b7_Andy's Avatar
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    Quote Originally Posted by Victorymike18 View Post
    Awesome thread, I enjoyed the read and insanely large pictures!

    Serious question: Have you considered Megasquirt for standalone?
    All the pictures are shared links from imgur so I’m not sure how to edit the size. And I’ve thought about multiple standalone systems, but I’m just not sure how to run the standalone ECU while maintaining stock ECU to control everything else.

  31. #71
    Veteran Member Four Rings Blazius's Avatar
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    Megasquirt does not belong on an Audi B5.. HUGE downgrade from Motronic even NA form.

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    Quote Originally Posted by Blazius View Post
    Megasquirt does not belong on an Audi B5.. HUGE downgrade from Motronic even NA form.
    Fair point. I don't have hands-on experience with these cars (yet) but know that MS is a worthwhile upgrade on Mk1 & Mk2 VW engines, which is why I asked.

    Not intending to hijack the thread, but I'd say that a B5 with the 12v (for those who like them) may be a good candidate for Megasquirt.

  33. #73
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    Any chance @B7_Andy is still watching this? I'm curious about a couple things:

    First off, any updates on the SC setup, and have you moved ahead with twin charging?

    Second: You mentioned the B7 uprights added some track width which damaged the CV boots. I haven't heard about that and have a pair of B6 aluminum uprights I was planning to swap onto my car, but now I'm worried... Did you use the early B5 S4 aluminum uprights, or the iron ones which Audi had to use about halfway into the B5 S4 production.

  34. #74
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    Andy, I saw your g2 kit up for sale on instagram. Reason for selling?

    Would also be curious to hear about your experience with spindles on this platform as well!
    I scored a 99.5 a4 that had a g2 kit on it. total barn find. still waiting for the keys from audi so no idea how much work the thing needs but its low miles at 83k and most of those miles are without the SC.
    There was a b7 s4 at the junkyard so I pulled the front spindles, calipers and rotors. Then I saw your thread... Sounds like I'd need to swap an 0a3 in and use b7 axles to make it work. or swap the inner joints of b7 axles with mine, if that's possible.

  35. #75
    Veteran Member Four Rings b7_Andy's Avatar
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    Denver, CO

    Just wanted to update this thread. I sold the supercharger and parted the vehicle out around a year and a half ago. The car did 25,000 hard miles with the supercharger and never burned a drop of oil. This was a super fun car and I definitely miss it!

    I sold my supercharger kit to a b5 owner in Canada that installed it on his A4. Apparently there is someone on Instagram that goes by "audilambo_auto_parts" who is falsely advertising this supercharger kit. He is a scammer and has been using my pictures along with pictures of other people's parts to steal money. HE IS NOT SELLING MY SUPERCHARGER KIT. I've had a handful of people report him and I don't know how his account hasn't been taken down yet. If you see his post with my old supercharger kit for sale, please report his account.

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