MAFS are AMAZING. It's FIXED!!

[A4 TSCHUSS]

Well I have always said from right when I got my GTRS back in January of 06 that my car wont run for shit with the MAF unhooked. I dont understand how others can but I just proved it again that mine wont!

I redid my intake and put in the MAF in the 3" housing and bam 12:1 air/fuel at 15psi. Ok lets turn it up some, BAM! 20psi 12:1 air/fuel. Ok a little more, 24psi and still 11.9:1-12.1:1 and also on timing 9 making 10-12 degrees of timing.

My timing was reading high with the maf unhooked saying 14-19 range, guess stuff was all out of wack

[traf818]

get your ass to the dyno now!!!

[7speed]

glad you found the problem, one day when my engine grows up it will be just like yours

[PCYC]

I wish i could learn all that stuff, i guess you have to build it to understand it

[RLB6]

get your ass to the dyno now!!!

X2. I see about 370 AWHP in your future

[Don Supreme]

So how does 24 psi feel?

Please log inj on time @ 24 psi --- very important.

[A4 TSCHUSS]

I will do it tomorrow morning before I turn the boost down and leave town.

[Don Supreme]

How does it feel ---- not impressed? --- I bet you that 3" housing is choking you up a bit.

[A4 TSCHUSS]

I have a late spooling issue too I need to figure out and a bad oil leak from the driver side of engine. I had the spool problem when I put in the GT3071r for the 2 or 3 weeks I ran it. It was hitting like 20psi at 4700 rpm. I swapped out my bov for my old dv so that wasnt the problem and now my engine is all new and also a different turbo and it is still spooling late. I think that would all point to the wastegate. I dont know if that could be related to my having a 5psi spring or not but I hit 20psi at like 4400rpm.

And my intake is a 4" 90 coming off the turbo that tapers to 3" then I have a piece of 3" exhaust pipe as a spacer between that and then a 3" hump hose then another spacer then a 90 turning it toward the passenger fender, then the MAF and then a cone filter on the end. I was running just the 4" to 3" 90 off the turbo then the spacer with the filter on the end before making the whole intake with MAF, it did the same late spool then.

And it is definitely faster than before but I cant see how Shawn was saying his car scared him when he turned it to 27psi with like 5 degrees of timing. Mine is far from scaring me, Shawn what a wimp! I guess I need to run against another car to really see how I am doing. I didnt think my GTRS was really fast either when I put it in until I ran someone else and smoked them.

[Don Supreme]

Doubting your 11 sec run now???

Listen --- change that spring --- the spring is probably starting to crack open a bit...

[A4 TSCHUSS]

I am gonna order a new one and I said on race gas tweaked out, not at 24psi and 11 degrees of timing on 93 and meth.

[HTA A4]

What intake do you have on right now David?

EDIT: Do you get any CELs with the new setup?

[A4 TSCHUSS]

What intake do you have on right now David?

EDIT: Do you get any CELs with the new setup?

Read post #9 for intake and I have a CEL for the VVT since the plug is just hanging by the fire wall due to the AEB head not having VVT (variable valve timing) with my Schrick cams which use a non vvt cam chain tensioner.

[CO AVANT]

yeah wondering if you pull the upper limited maf exceeded code like Shawn and I have on this maf setup with revo 550cc 8500 software. Let me know if it ever pops up...

[Don Supreme]

I am gonna order a new one and I said on race gas tweaked out, not at 24psi and 11 degrees of timing on 93 and meth.

Yeah, but the car should be "scary fast" @ 24 psi --- so something is up or you are just down playing - more than likely its the former.

That slow boost onset will also rob that feeling of crushing torque onset.

Can we get a video muwhahahha...

[HTA A4]

CO AVANT, do the cat cams have vvt?

[A4 TSCHUSS]

Maybe tomorrow night I will race my friend with a B5 A4 with Tapp tuned 3071r to see where I stand if my trip goes well and I dont have any problems (crosses fingers)

[A4 TSCHUSS]

CO AVANT, do the cat cams have vvt?

You can use it with the smallest ones (3651)

[Don Supreme]

Maybe tomorrow night I will race my friend with a B5 A4 with Tapp tuned 3071r to see where I stand if my trip goes well and I dont have any problems (crosses fingers)

Good luck ---

[B6Lovin]

Yeah, but the car should be "scary fast" @ 24 psi --- so something is up or you are just down playing - more than likely its the former.

That slow boost onset will also rob that feeling of crushing torque onset.

Can we get a video muwhahahha...

slow boost onset ftl. I just put a MBC in line with my wastegate today (still on 14.7 at first) and that shit felt amazingly quick by comparison. the faster onset of boost (aka spike instead of the linear pull i had) is just mind blowing, and it happens about 150-200rpm sooner with the MBC than just on the WG spring alone.

upping it to 17psi just made my night.

i'd definitely be willing to bet that your weak WG spring has something to do with your excessive lag, but it's good to hear that your A/F is back in spec. sucks that you're having to run that dinky little MAF - when you go to custom tune on the 750's you should see about having that deleted.

[A4 TSCHUSS]

Pretty sure he tunes to a 3" maf as well. Have to check in to it more

[A4 TSCHUSS]

3rd gear pull on 24psi, 93 octane, meth injection, Revo timing 9

Injector on time and A/F

[A4ringedONE8T]

BTDC? CF's?

[Don Supreme]

HOly fuck duck -- Just like I told you ---

You are running OVER 100% duty cycle - the injectors are MAXXED OUT!!

Don't run the boost that high until you get bigger injector with tune.

[Don Supreme]

Should be spraying enough fuel for over 500 Crank HP...

Its good thing don't have an 8500 file because you would WAY WAY LEAN.

[CO AVANT]

I'm still wondering why you are not pulling higher g/s than me with the same maf setup... I did not use my maf at sea level so don't know what my readings were down there.

Anthony, I currently have the vvt solenoid unplugged on my 3651's because I kept getting an intake cam over-advanced code with it plugged in, even though engine and cam timing were dead on perfect, and runs perfect. BobQ told me to just run them without vvt.

[A4ringedONE8T]

HOly fuck duck -- Just like I told you ---

You are running OVER 100% duty cycle - the injectors are MAXXED OUT!!

Don't run the boost that high until you get bigger injector with tune.

How are you seeing they are maxed out?

[mike-2ptzero]

I dont think 6 seconds from 3800-6500 in 3rd gear which seems to be on the slow side is going to be anywhere near 350whp. Might want to compare the time it takes your car to run 3rd gear compare to shawns.

For BAT we also use 4200-7500 or even 4500-7500.

How are you seeing they are maxed out?

Doesn't his AFR go lean at the end of his run once he hits 7k rpm?

Time stamp 10.01
.821 requested AFR
1.047 actual AFR


Next time stamp of 10.2 still shows high engine load so he was most likely still WOT at that point.

[Don Supreme]

How are you seeing they are maxed out?

I can calulate it based on the data in the log.

There are 1 of 2 things happening here (or maybe a little of both)

ME7.5 is attempting to target lambda as programmed by REVO
1:
His setup is flowing so much air that the ECU is opening the injector for longer periods of time to try and compensate, but an injector can only open but so much.... He hit 90% of max @ ~ 5500 RPM and hit 100% @ ~7000 RPM.

2: The fuel isn't flowing due to restriction of flow due to weak fuel pump, small lines, or whatever (So the ECU keeps requesting more fuel the only way it can, by opening the injector longer)


(I am leaning towards #1)

Needless to say - Opening an injector for 100% duty cycle is never a good thing. The injector may over heat(and fail) and the injector goes STATIC - meaning it just pours fuel like a garden house instead of pulsing like it should.

[dougyfresh]

Don Supreme...
Don't lean on #1 too far. He's got the stock fuel pump in and I'm sure that is limiting things quite a bit.


#2 can be omitted if fuel pressure up at those RPMs is checked. If fuel pressure dies then the pump can't handle the requested flow. (which you know)

[ThatGuyAlex]

can someone make a post on how to read this damn chart. I wanna learn since im on my way planing BT

[Don Supreme]

can someone make a post on how to read this damn chart. I wanna learn since im on my way planing BT

There is probably a thread dedicated to it already.

Maybe I should post this, but I was thinking of developing.... ah I won't post it... talk is cheap.

[dougyfresh]

can someone make a post on how to read this damn chart. I wanna learn since im on my way planing BT

This is the beginning: http://audizine.com/forum/showthread.php?t=43545

More details need to be added.

[Don Supreme]

Don Supreme...
Don't lean on #1 too far. He's got the stock fuel pump in and I'm sure that is limiting things quite a bit.


#2 can be omitted if fuel pressure up at those RPMs is checked. If fuel pressure dies then the pump can't handle the requested flow. (which you know)

I doubt he is monitoring fuel pressure... bottom line is lower the boost until further notice.

[dougyfresh]

I doubt he is monitoring fuel pressure... bottom line is lower the boost until further notice.

My thoughts exactly. I was just posting what 'needs' to be done to better figure out what is going on.

With trying to get these 'off-the-shelf' tunes working on configurations they weren't written for (or any tune for that matter) many things need to be looked at. Fuel pressure being one of them. Wide-Band for A/F is another. EGTs are another. Etc.. etc..

[mike-2ptzero]

Don Supreme...
Don't lean on #1 too far. He's got the stock fuel pump in and I'm sure that is limiting things quite a bit.


#2 can be omitted if fuel pressure up at those RPMs is checked. If fuel pressure dies then the pump can't handle the requested flow. (which you know)

You mean he still hasn't installed the 040 fuel pump he bought?

[A4ringedONE8T]

You mean he still hasn't installed the 040 fuel pump he bought?

I believe its in the car already

[Don Supreme]

You mean he still hasn't installed the 040 fuel pump he bought?

I didn't know he had one....... The 040 pump should do the trick nicely, but they aren't as powerful as the 044s.

"Bosch 040 pump is 235 litres per hour and supports 520 bhp at 73.5"

[dougyfresh]

You mean he still hasn't installed the 040 fuel pump he bought?

Correct.

Here you go:

Also I turned the boost up to 20psi for one run and had nothing but 13:1 through 13.7:1 the boost is now down at 15psi where it will stay until I figure this out. I am thinking if I should just not even screw with the Revo and start my custom tune now with the 750cc injectors. I still need to put in my 040 fuel pump but I cant see that being the problem since Shawn is running 27psi without an issue while I cant run 18psi. Also gonna put in my MAF since my car idles terrible without it and loads up sometimes. I have never been able to run without it while others dont have a problem, I dont get it.

http://audizine.com/forum/showthread...45#post2972745






Don. It should be enough

flows can support over 500HP and flows of 250l/hr at 55psi and 160l/hr at 73.5psi,

[mike-2ptzero]

I didn't know he had one....... The 040 pump should do the trick nicely, but they aren't as powerful as the 044s.

"Bosch 040 pump is 235 litres per hour and supports 520 bhp at 73.5"

Yeah back when he got Greg's old FMIC.