Please help! Boost acting funky
LOL....Classic Clay...The logs would show the slip or other issue, but you want to rather just speculate...Enjoy Clay...
He can go verify by putting it in 5th gear at 2000rpm or so and hammering the throttle. If the RPMs jump up as soon as he hits peak boost without the car accelerating, then the rpms fall back down and catch, he knows the clutch is slipping. Much easier and simpler than trying to gather all those tools to diagnose it by looking at logs.
What am I supposed to enjoy?
EvoM Guru
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From: Tri-Cities, WA // Portland, OR
Im not exactly sure if this is boost cut or what, i will try my best to explain. So im driving 65 on the highway in 5th and decide to get on it a little. Boost starts creeping slowly and then my rpms drop about 200 and seems like my turbo hiccup'd but the car continues to pull strong after this. Any clue?
This also happens in 4th gear, kinda like the turbo lags a little to much and then it just kicks in trying to make up for what it lagged?? if thats even understandable.. Im just really frustrated right now. When i accelerate at wot for the first two gears allseems normal. Could this be boost cut? boost controller gone bad?
Any help/advice would be appreciated..
but the car continues to pull strong after this. Any clue? This also happens in 4th gear, kinda like the turbo lags a little to much and then it just kicks in trying to make up for what it lagged?? if thats even understandable.. Im just really frustrated right now. When i accelerate at wot for the first two gears allseems normal. Could this be boost cut? boost controller gone bad?
Any help/advice would be appreciated..
Yes...and that's why it's the clutch. They don't just drop - they rise then drop, but he doesn't know how to describe it, because he's not familiar with what a slipping clutch does.
What were you trying to point out by saying this?
What were you trying to point out by saying this?
EvoM Guru
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From: Tri-Cities, WA // Portland, OR
I was trying to point out that the guy clearly observed a drop in rpms, but did not say anything about seeing an upward spike in rpms.
Clay & Original Poster -- There are several characteristics of a clutch that is going bad. If you feel your clutch is bad, then OK get a new one, but I would still explore a few other tests prior to that expense.
My suggestion was to log the car during the problem because that would reveal a lot (including a slipping clutch). Although a slipping clutch is still possible cause to your dilemma, I really doubt it is the problem. I feel this is the case because you mentioned that you just turned down the boost a tad (peak torque on my car changed very little @22 psi vs 25 psi becuase of the timing changes) and your problem went away. That said, Clay could be right and your clutch could be slipping. A simple log of the car would resolve the problem -- something you should consider given you have modded your car (IMHO).
My suggestion was to log the car during the problem because that would reveal a lot (including a slipping clutch). Although a slipping clutch is still possible cause to your dilemma, I really doubt it is the problem. I feel this is the case because you mentioned that you just turned down the boost a tad (peak torque on my car changed very little @22 psi vs 25 psi becuase of the timing changes) and your problem went away. That said, Clay could be right and your clutch could be slipping. A simple log of the car would resolve the problem -- something you should consider given you have modded your car (IMHO).
It's much simpler and quicker to go out and test the clutch in 5th gear than to procure all those logging items. He can test the clutch the next time he drives, but it may be a week before he gets all those items. I agree that it's a good idea to have full logging capabilities, but that does not have to preclude testing the clutch.
It's much simpler and quicker to go out and test the clutch in 5th gear than to procure all those logging items. He can test the clutch the next time he drives, but it may be a week before he gets all those items. I agree that it's a good idea to have full logging capabilities, but that does not have to preclude testing the clutch.
...Peace 
I 100% completely agree with Warr here. In fact, I would be willing to be that it is a clutch problem. Whoever said fuel cut is a moron and shouldn't be giving troubleshooting advice. Warr is one of the smartest guys on this forum, you guys should really listen to what he has to say...
Thanks guys for all the important info/feedback. I have came to the conclusion that it is my clutch just by reading some of the things written, and on top of that my car showing the exact symptoms. The search will now begin for my new clutch. Let the research begin......
Be sure to do that test I prescribed above before purchasing a clutch, but I don't think there's much hope.
As for clutch recommendations, I've written reviews on 3 different clutches, so go take a look if you want. My top recommendation is the Exedy Twin HD cerametallic for around $1300-1400 (includes lightweight chromoly flywheel). If you want a single disk for under $1k, then I suggest the Exedy stg2 4-puck, but that's only if you don't mind harsh initial engagement when starting from a stop. I don't recommend single disk organics.
As for clutch recommendations, I've written reviews on 3 different clutches, so go take a look if you want. My top recommendation is the Exedy Twin HD cerametallic for around $1300-1400 (includes lightweight chromoly flywheel). If you want a single disk for under $1k, then I suggest the Exedy stg2 4-puck, but that's only if you don't mind harsh initial engagement when starting from a stop. I don't recommend single disk organics.
I 100% completely agree with Warr here. In fact, I would be willing to be that it is a clutch problem. Whoever said fuel cut is a moron and shouldn't be giving troubleshooting advice. Warr is one of the smartest guys on this forum, you guys should really listen to what he has to say...
Im not exactly sure if this is boost cut or what, i will try my best to explain. So im driving 65 on the highway in 5th and decide to get on it a little. Boost starts creeping slowly and then my rpms drop about 200 and seems like my turbo hiccup'd but the car continues to pull strong after this. Any clue?
This also happens in 4th gear, kinda like the turbo lags a little to much and then it just kicks in trying to make up for what it lagged?? if thats even understandable.. Im just really frustrated right now. When i accelerate at wot for the first two gears allseems normal. Could this be boost cut? boost controller gone bad? Any help/advice would be appreciated..
but the car continues to pull strong after this. Any clue? This also happens in 4th gear, kinda like the turbo lags a little to much and then it just kicks in trying to make up for what it lagged?? if thats even understandable.. Im just really frustrated right now. When i accelerate at wot for the first two gears allseems normal. Could this be boost cut? boost controller gone bad?
Any help/advice would be appreciated.. ....Does your clutch engage extremely late? Is your clutch really soft? Are you sure the RPMs did not climb / rise and the car feel like it slowed down [rate of acceleration decreased]?
Xballsport -- Sorry but I am still perplexed by the RPMs dropping and a clutch slipping ....Does your clutch engage extremely late? Is your clutch really soft? Are you sure the RPMs did not climb / rise and the car feel like it slowed down [rate of acceleration decreased]?
....Does your clutch engage extremely late? Is your clutch really soft? Are you sure the RPMs did not climb / rise and the car feel like it slowed down [rate of acceleration decreased]?