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So this problem has been going on for a while now, and I've made some progress recently in some areas but not in others.

The biggest problem is I'm experiencing either a fuel cut or ignition cut under anything more than light throttle. I can build a max of 4-5 lbs of boost, but the higher my RPMs the less boost I can build.

We have fixed all the codes that were thrown by the ECU... what the hell would cause my car to do this but not throw a code????

Unfortunately, the shop that originally did the engine replacement/mods really did a number on me, as the wiring and vacuum system was totally hacked up. That being said, we've fixed the wiring, but we're not sure of the vacuum lines. I'm running non-seq with the air pump.

Basically, given the shitty job done on wiring/etc, I need to know every little thing that could possibly cause this kind of boost problem. For all I know, the turbos aren't even configured for non-seq like they should have been!

...Also, the car used to fall on its face @ 4500 RPMs regardless of boost/no boost, but we've fixed that problem...

It starts great, idles fairly well, and runs great other than the boost issue. Even at light throttle and 2-3 lbs of boost it pulls nicely... I just can't have too much fun

Here's my update in the Midwest Forum:

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"Allright, thanks to a TON of help from Kevin (thanks again!), we've made some progress on my car finally. The wiring was totally hacked up, so we've cleaned that up and we think we have the solenoids straightened out (bye bye rats nest!), but aren't too sure about the non-seq vacuum setup with the airpump still in use.

After getting things back together Sunday, we got it started but the Check Engine Light was on. Took it out and still having the problem of loss of power as RPMs and boost increase. Pulled the CEL - Code 5 for the knock sensor.

Tonight we fixed the knock sensor problem (no more codes finally ) but the car is still falling on it's face. HOWEVER, unlike before, I am able to get it past 4500 RPMs, so that's an improvement as well.

Talking to Ryan and Gary, they don't think I'm getting a fuel cut... so if it's not a fuel cut, I guess that would mean the ignition is being cut for some reason? I can hit 4-5 lbs of boost at lower RPMs, but again as RPMs increase the less boost I can build without the car totally falling on it's face.

Other than the vacuum hose setup for the non-seq w/airpump, which we're not 100% sure we have right, we're kinda stumped. If the clown that did the original engine swap/mods screwed things up so badly with the vac lines and wiring, is it possible he has the boost controller wired wrong and is it possible that could cause this kind of problem?

If the turbos aren't set up correctly for non-seq? What if the door wasn't welded open like it should have been?

I'm just tossing ideas out, because after seeing what I've seen under my hood/manifold, I have NO faith in the work previously done. I'm surprised it was even running at ANY point

Anyways, any more ideas would be appreciated. We'll be diving back in all day Sunday again!"

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Any and all ideas will be very appreciated! Now that we're finally making some progress and working on it, I want to get this f**ker running the way it should! It's been almost TWO YEARS

Mods are in my sig below....

TitaniumCranium

iTrader: (3)

mabey the fuel cut sensor is fautly

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Maybe, but I'm told what I'm experiencing isn't a fuel cut.

DrunkenBowler

I would check and re-check your vaccum lines. That's usually a common place for loss of boost. Or, you can buy a new wiring harness and install that.

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I think wiring-wise we're good; we checked continuity on the major components and all tested OK.

Vacuum definately a possibility... we're still trying to figure out if we have it set up correctly for the non-seq with air pump.

Kento

Sounds definitely like a vacuum line problem to me. The fact that higher rpms reduces your maximum boost level is a sign IMO. Go over that stuff with a fine-tooth comb.

rdavidsrx7

higher rpms, boost goes down.....sounds like only one turbo is pushing boost, did you remove the buterfly in the Y pipe that would normaly block off the second turbo. What about the precontrol flapper in the manifold, you mention it but have you checked whether it is cut away or atleast held open?

rdavidsrx7

whats your email? I'll send you a vac diagram specificly for the non-sequential mod, it was invaluable to me. PM to me incase i miss this thread.

Bob

Fatman0203

Check if you have the pill's in the vacuum lines. I didnt have them and did the 5$ boost controller and that was my problem.