fuel cut possibly??

[blk_srt]

When I hit full boost(about 14psi for now) after a few seconds its like I'm getting fuel cut or something cause the car just jerks and kind of acts like I have a boost leak. I just changed my plugs with some NGK BE7RES gapped at .028 like chunkymilk instructed and that didnt solve anything. Any ideas as to what might be the problem?

[defiancy]

Originally Posted by pr_ricer

When I hit full boost(about 14psi for now) after a few seconds its like I'm getting fuel cut or something cause the car just jerks and kind of acts like I have a boost leak. I just changed my plugs with some NGK BE7RES gapped at .028 like chunkymilk instructed and that didnt solve anything. Any ideas as to what might be the problem?

I'm having the exact same problem.

[blk_srt]

Originally Posted by defiancy

I'm having the exact same problem.

I'm glad I'm not the only one. At least now someone knows what I'm talking about.

[Turbodog97]

That sounds strange but probably not fuel cut because I remember my eclipse with the evo III and no fuels mods topped out at 16psi with no problem. From what I've heard about fuel cut, it's like you just hit a wall while boosting. Have you changed your plug wires also? If you did have a boost leak the car would definitely jerk a lot, I would check again for cracks and holes in your piping.

[defiancy]

I know I don't have a boost leak I'm almost 100% sure. I just can't figure out what it is.

[blk_srt]

I just changed the plugs and wires and I've smoke tested my entire intake/exhaust system granted its not pressure testing but all my couplers were just replaced with silocone so those are good. I can't think of anything that could cause this
EDIT: Also if you where to have a boost leak wouldn't it be noticable more than just at full boost, or could it just be a leak that only leaks at full boost? I think I might have just answered my own question

[defiancy]

Originally Posted by pr_ricer

I just changed the plugs and wires and I've smoke tested my entire intake/exhaust system granted its not pressure testing but all my couplers were just replaced with silocone so those are good. I can't think of anything that could cause this
EDIT: Also if you where to have a boost leak wouldn't it be noticable more than just at full boost, or could it just be a leak that only leaks at full boost? I think I might have just answered my own question

I've had a boost leak before, and when I would try to boost I could hear the turbo spinning but I wasn't getting any boost. hence boost leak. I mean that was a major one but on a smaller scale I think it would be you wouldn't be getting as much boost as normal.

I'm getting good boost until 14-15psi, as soon as it hits that the car just fucking jerks like it's stuttering or something. Just like yours

It makes me think fuel cut.

[blk_srt]

Originally Posted by defiancy

I've had a boost leak before, and when I would try to boost I could hear the turbo spinning but I wasn't getting any boost. hence boost leak. I mean that was a major one but on a smaller scale I think it would be you wouldn't be getting as much boost as normal.

I'm getting good boost until 14-15psi, as soon as it hits that the car just fucking jerks like it's stuttering or something. Just like yours

It makes me think fuel cut.

yep, same thing. I think we might need Kevins knowledge lol

[violent31601]

you sure your car isn't cold?

[blk_srt]

Originally Posted by violent31601

you sure your car isn't cold?

umm, yes

[LouieAWDTSi]

Yea my car seems to jerk like that only when the engine is cold. Than again, it doesnt do it at full boost, just basically in between 1 psi and 13psi(full boost) when its cold. Im really curious about your problem though. Kevin's knowledge would def be appreciated for this.

[inatalonIXLR8]

My car acts the same way. Only under full boost after about three seconds. Drives me mad! I've always thought fuel cut, but I want to fix it asap.

[kjewer1]

Fuel cut won't act like a stuttering, as someone mentioned. It just straight shuts the fuel off, for a couple seconds. Of all the boost leaks I've had, none really caused a stuttering effect, while 99% of the time this is ignition related. So I would stick with ignition for now. The plugs sound good. I know you said you changed the wires, but there are only two wires that I trust. Stock (ran them deep into the 11s ) and NGKs. I've seen just about every other type fail on install, right out of the box, especially if they are not designed specifically for a turbo car. NT wires don't have to do 10% as a good a job as turbo motors wires do. The compressed fuel air mixture is much denser than what you find in an NT motor, it can be tougher to get a spark through. If the path of least resistance becomes out the side of the weak ass jacket or boot, you're all done. Magnecores are technically a trusted brand meant for our motors, but I've had too many of them shit the bed as soon as I install them.

If the description was a little different I might suspect fuel cut if the temperature where you are is very low. Air density goes up of course, and the mas reports this to the ECU as expected. You will hit the limit at a significantly lower boost than you did in the summer. Hard to say if 14 psi is the magic number, since there are so many variables in different setups. All the talk I go into about changing airflow vs boost applies here as well.

If plugs and wires dont do it, I usually try to borrow coil packs and ignitors to go one step further. I always have an extra ECU closeby as well, just in case that would do it. Only then would I move away from ignition related troubleshooting and try other things. A boost leak test certainly is easy to do, and I recomend to do them no less often than you would change your oil anyway, so do that if you havent already anyway, regardless of wether or not we exepct it to be the source of the stuttering.

[blk_srt]

Just put on stock wires, and yes its pretty cold here(minnesota, averaging 30 or less during the day)

[inatalonIXLR8]

Yeah, my Talon doesn't exactly hit a "wall" like you said with fuel cut. It stutters. I'll definately check the ignition system, thanks.