Cranking k04 wastegate and installing n75H(race) Valve..hav sum questions????

[audikid66]

hey so my buddy had a GLI with giac tune ..bolt ons etc. and he cranked his k03 wastegate and put on a n75H valve and his boost holds real nice.. on a k03 he is like just starting to drop boost from 20 lbs to like 16 at 5200 rpm and at 6000rpm he is still at like 15 when im normally at 12..so it spools up a tiny bit later but he gets boost longer in his powerband and holds better... now im doing this to my K04 tomorrow.. im wondering if anyone has experience with this and can put in some input and if anyone here is running the n75H valve and if it has helped their car..thanks in advance....

[absolutegtr]

i have read the n75h will cause problems....the b5's like the race one....but supposedly our b6's dont

[audikid66]

yea i've heard mixed things

[audikid66]

bump anyone have any input?

[LampyB]

i've also heard an overwhelming "stay away from the N75 race valve" here on AZ. a lot of people have sold it after installation because of problems in their B6. i can't say what the deal is for a B5/B7. you're only using a K04, my recommendation is stick with the stock N75 ("F" i believe...?) and it'll perform better than the race valve.

[phantom b6]

I don't think cranking the wastegate is good for the turbo, although if you don't beat the shit out of it you shouldn't have too much of a problem.

I'm cranking my k03 on Friday for a dyno on Saturday. I barely drive anymore so I might leave it... I plan on a k04 anyway

[audikid66]

i beat my car.. if i blow the ko4 then ill jus go bigger

[audikid66]

might try putting my buddys n75h in my car first to see how it reacts.. i heard some people love it and some people jus keep gettin put in limp mode

[Shady Milkman]

there isnt any good reason to having 20psi to redline on a k04 its all just hot air at that point

[audikid66]

it won't be all hot air when im tuned on meth soon..

[audikid66]

shadymilkman- how those s4 brakes that i sold you treatin ya? i ended up buying another set when i fucked up my old wheels and got new wheels..love em!

[Shady Milkman]

shadymilkman- how those s4 brakes that i sold you treatin ya? i ended up buying another set when i fucked up my old wheels and got new wheels..love em!

i love them, they bite plenty hard for me

when you get meth we should do some pulls if you ever up in north nj. I just have a revo k04 with the stock cat. It would be cool to see how much more power you get out of it

[audikid66]

def man...yea im up in nor jerz a decent amount..especilly in winter...im down even before i do meth...damn bro take the stock cat off...your car will feel mazingly better..jus get a test pipe

[Shady Milkman]

def man...yea im up in nor jerz a decent amount..especilly in winter...im down even before i do meth...damn bro take the stock cat off...your car will feel mazingly better..jus get a test pipe

im trying to figure out what to do with my car

i was about to sell it for an evo x then decided to keep it for another year or 2 and maybe get a c6 z06

if i keep the car im thinking about building a gt28rs turbo kit for my car

[DenverNoob]

race valve, meth, or otherwise, physics are going to prevent you really being able to get more out of your k04. Believe me when I tell you this...I took a k04 as far as it could go and really at the end of the day got all of an additional 5whp out of it. Simple fact is that the turbo is too small. Even if you can get the compressor to make 20psi to redline (and I was making 25 spikes, holding 18 to 5500rpm at 5800 ft elevation on E85 fuel)...not only are you blowing hot air, you are also forgetting that the real problem is actually the exhaust housing, which can only move a VERY finite amount of air. Exhaust turbine drives the compressor, so do the math there. On those little turbos, your drive pressure (pressure between the exhaust ports and the compressor) is going to be double or worse to the pressure the compressor is making (ex: 20psi in the compressor, 40+ psi of drive pressure). This means you are WAY tapped out. not only will you not make more boost, it can flat out be bad for the engine.

in short, I would stay away from race valves, and I would DEFINITELY not f*uck with the wastegate on a k04. All you are going to do is blow sh!t up.

[audikid66]

doooo it! i might eventually go gt2871r..i wanna get the full potential out of the k04 tho which is why im going for a maxxed out k04 setup

[AudiA4_20T]

lol have you looked at what cranking the wastegate entails on our cars? Its 10x harder than a VW

[audikid66]

thanks for the input guys

[audikid66]

what do you mean? thought i cn jus go under there and screw in that nut on the wastegate actuator?

[AudiA4_20T]

you can but its near impossible to get to... I did it on my K03 when I built the 2.0L, but the motor was out

[audikid66]

hmm.. i guess ill figure it out.. im bored and got nutin to do today so. y not

[phantom b6]

You're going to have to unbolt the turbo from the test pipe/cat and the exhaust mani and try to move it enough to reach the wastegate

[widgget]

yeah, i'm pulling my GTRS tonight to tighten my wastegate (want to verify it's not the cause of my boost issue). there really isn't anyway you can get to it.

[audikid66]

yea i figured that out today....cant do it without unbolting the test pipe from the turbo.. i did re-align my neuspeed snub tho and got rid of some vibrations! gonna try my buddys n75h and if it work good then ill keep it on and buy him a new one

[widgget]

pulled my GTRS out and the adjustment looks good, the wastegate had pressure on it so it didn't have any play at all.don't think it could have gone tighter. did the oil while i had it on the ramps too.

the MBC i ordered today should be here next week sometime so i'll replace the N75H i have right now an see if that makes a difference. if not then i'm just going to have to keep clamping off sections of the whole system and doing repeated pressure tests to isolate the problem area.

[audikid66]

dman thats beat man hope u figure out ur problem... im thinking bout doing an EBC i don't know if it will work good with a k04 tho

[AudiA4_20T]

dman thats beat man hope u figure out ur problem... im thinking bout doing an EBC i don't know if it will work good with a k04 tho

do you have meth? Seriously past that you just plain need a bigger turbo

[audikid66]

im doing meth very soon..which is why now that its cold i wanna find something to turn my boost up a smidge. so when i do meth all i hafta do it tweak timing with lemmiwinks.i just want it to hold a little better or push a few more lbs. out.... im going for a maxxed out k04 setup...then i might be doing a 71r eliminator...this way when/if i decide to do the eliminator all i need is turbo,injectors, and ill be getting it dyno tuned and rods to be safe

[audikid66]

will an EBC be ok with a k04 or no good?

[DenverNoob]

will an EBC be ok with a k04 or no good?

ittl work fine, the key is to control the boost spike which if in the right conditions can actually be devastating on a k04 setup. At the end of the day you are throwing a LOT of coin at a turbo that flat out cant do what I think you want it to do.

If you are gearing up for a BT setup, my advice would be to make purchases around that setup hardware-wise. Keep in mind some things will have to be changed (depending on the turbo a LOT could have to be changed) to get the BT setup right.

Honestly I see what you are trying to do here and can appreciate it. I did it myself...sh!t...I converted my entire fuel system to run ethanol as a fuel (similar to meth injection only 1/2 the issues from simplicity standpoint once the conversion was complete) and believe me...it can only go so far.

I would keep a SERIOUS eye on your boost spikes and do EVERYTHING possible to keep that turbo from spiking past 22 lbs, give or take. I let my k04 run a little wild and the results were, at the end of the day, somewhat bad (lol). Even running an MBC in tandem with the n75 is a good choice for the k04. no matter what adjustments you make, you are not going to sustain 20 lbs of anything past 5000 rpm on a good day without grenading that turbo. if that is your intention, it seems like a pretty big waste given the demand for new/used k04-15 turbos in the market right now....which ultimately could help you out getting a proper BT setup in the car.

I totally get that you like the k04, lord knows I did....but having been on both sides of the fence you are only going to do more harm then good trying to pull that last 5 whp out of it.

[b6onboost]

you can run the N75H with an MBC or EBC in tandem on a K03 or K04. as long as you set the max boost on the controller to 21-22lbs. all that will happen is you'll hold a little longer as the signal to actuate the wastegate will be delayed compared to an N75F. if you choose not to run an N75, as in MBC/EBC only, you end up with quicker spool but a very on/off throttle.

in all honestly all it does is change the spool/boost characteristics of the turbo. it doesn't actually make the car noticeably faster.

[audikid66]

i loved how my car felt with the mbc and no n75..i think im going with an EBC...any reccomendtions?

[CTS Turbo]

it won't be all hot air when im tuned on meth soon..

That should be fun, but your turbine wheel is still going to be spinning out of its efficiency range, at least you'll be ready for bigger and better things.

[audikid66]

yea i know..like i said im just going for maximum k04 setup..then see where i go from there..

[7speed]

Just sell your K04 and buy my GT71R

[audikid66]

i would but my money is being spent else where right now... just bought dtm carbon boser which is gettin the sides painted and clear bra then getting my USP front molded,repainted,clear bra, and my iforged wheels are gettin taken apart and the faced are getting painted..then ill be gettin the labonte water/meth kit installed.. sooo im gonna hafta enjoy the k04 til im ready to step up with the big boys.. i wanna do rods if im going bigger..jus for security

[HeymyAudi]

I tightened up the wastegate on my k03/04 hybrid I got and what I noticed is that the boost kicks in a lil bit faster and harder.. but this thing still runs outta air... I used a manual boost controller and I keep it around 18 to 20lbs and it moved really nice but dont think your going to see a big difference... Its just a bit more peppy

[audikid66]

put the n75H in and its not bad..no limp mode yet..spiking around 21 lbs...i think im gonna do an EBC when i do meth tho

[docurley]

Interesting thread, I'm due to migrate my Hybrid K04-15 (K04-23+ spec) from my B5 to the B6 and will be looking to max it. I ran this turbo for 3 weeks on a K03s remap and this thing would boost to 25psi+ no problem at all and I had to wind it down to 17psi with my EBC due to the Fuelling having issue trying to run so much boost.

I'm looking to slap it on my 190bhp Sport-line Quattro which is bone stock 380 injectors uprated DV (not sure which right now) and may be a N75J valve which I have heard good reports on and should hold better midrange boost then a custom remap which I'm hopping to yield around the 270bhp mark.