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Old 10-30-2013, 06:35 PM   #1
eclipseballer00
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Default Car cutting out at full throttle/boost

Hey guys im having a issue and although i have a few ideas im clueless on it.

So here it goes i will try to explain best i can, basically when im driving my car normally it runs perfectly fine, know when i put the gas down all the way the turbo spools and gets almost to peak boost and then drops, lets say im in 5th at 60mph and my rpms are building once i hit about 4.5k rpm and 15 psi boost it feels like the car goes into neutral and doesn't pull but the rpms are still going up. Then, if i keep holding the gas it will catch agian and start to pull very lightly then repeats the process.
I know not a very good explanation but its best i have to explain in words.

Some people told me could be my clutch? or could be the main hose from intercooler to throttle leaking? (going to try to replace this first)

OH and about my car
2005 wrx with about 85k miles on it
list of mods
Vf39
sti tmic
catless downpipe and hks catback
aem cold air intake
greddy bov that has recirculation back into the motor
cobb ap v2 set on stage 2

Everything else is suspension or body mods.

lmk if you guys have ever had this happen to you, or what it could possibly be thanks!!
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Old 10-30-2013, 06:43 PM   #2
GrimmSpeed
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Are you loosing boost or just power?

Mike
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Old 10-30-2013, 07:05 PM   #3
eclipseballer00
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I loose all my power and probally only a little boost
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Old 10-30-2013, 08:24 PM   #4
jerbull88
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Quote:
Originally Posted by eclipseballer00 View Post
I loose all my power and probally only a little boost
Makes no sense at all. If the rpms are going up and your speed is not, then your clutch is indeed slipping.
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Old 10-30-2013, 09:58 PM   #5
eclipseballer00
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Replaced the hose and went for a test drive, no luck. Guess I'll need to get the clutch replaced lol
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Old 10-31-2013, 12:08 AM   #6
Wrxstage2yukon
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That's your clutch man, but if it's gives out violently that would be wierd,
A clutch when it slips is just that, it's slipping and not taking the load properly and usually they show symptoms at WOT
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Old 10-31-2013, 12:14 PM   #7
GrimmSpeed
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If the clutch was slipping wouldn't the RPMs jump? From his description it sounds like there is a loss in power not the clutch slipping.

Mike
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Old 10-31-2013, 12:19 PM   #8
danger1138
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Yup Tell tale signs of a slipping clutch. If you floor it and revs are building, but once you get to the rpm range where your making the most torque, lets just say 4500, your clutch just cant clamp down and hold that load anymore therefore it slips. You feel like your in neutral in which u rev but the car isnt responding.
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Old 10-31-2013, 06:40 PM   #9
GrimmSpeed
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I could be wrong but it just doesn't sound like a clutch to me. He said the revs keep climbing but power goes down. If the clutch was slipping then the revs would jump and then settle back down.

I bet this is related to something in the ignition system or maybe a bad maf? When was the last time your plugs were changed?

Mike
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Old 11-01-2013, 01:26 AM   #10
_mPizzle_
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As much as I hate to say it, it's definitely the clutch. Mine did that same exact thing but at lower rpms even... It was bad. It did in lower gears too with enough boost. The clutch is slipping out of gear. Don't wait till it's too late and also try to get a new flywheel or have the one you have resurfaced. It'll save you some headache later. Sorry man.
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Old 11-01-2013, 09:00 AM   #11
InTheBurbs_of_Chi
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Clutch.
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Old 11-02-2013, 09:41 PM   #12
eclipseballer00
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Thanks for all the help guys, it is the clutch. I searched youtube vids and my car is doing the exact same thing.
Ill need to replace the clutch, does anyone have any advice as to what a good clutch would be to buy? Gonna call some shops and ask about install and re surfacing as well.
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Old 11-02-2013, 09:45 PM   #13
eclipseballer00
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Thanks for all the help guys, it is the clutch. I searched youtube vids and my car is doing the exact same thing.
Ill need to replace the clutch, does anyone have any advice as to what a good clutch would be to buy? Gonna call some shops and ask about install and re surfacing as well.
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Old 11-02-2013, 10:08 PM   #14
IdahoTrey
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The same exact thing happened to me a few weeks ago. I replaced my clutch with an Exedy OEM replacement along with a brand new flywheel. I ordered both from Flatirons Tuning and was stoked with the price and shipping time. I definitely suggest a new flywheel vs a resurfaced one too.
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Old 11-04-2013, 12:55 AM   #15
Zath22
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mine was doing this too but my clutch is old
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Old 11-04-2013, 01:07 PM   #16
kaotic WeRX
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go oem clutch for the power you have it will suffice. It is better for a clutch to slip when overheated than for a tranny to receive all the shock.
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Old 11-05-2013, 09:56 PM   #17
BuckwildWRX
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What about the possibility of timing retard due to knock... I had a dsm that would pick up knock and make it feel like I lost power with the more boost it saw.
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Old 11-05-2013, 10:04 PM   #18
jerbull88
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Quote:
Originally Posted by BuckwildWRX View Post
What about the possibility of timing retard due to knock... I had a dsm that would pick up knock and make it feel like I lost power with the more boost it saw.
Nope.
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Old 04-25-2014, 10:07 PM   #19
Sandy93
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I'm new to this I have had my car for like almost two years
The mod are
Intake
Down pipe
Sti top mount
119000 miles
No TUNE GOING TO GET THAT.. WANT TO FIX
WHATS WRONG FRIST
02 Wrx


So what's wrong is I have lost all my boost and also sputters when under load boost might hit just 5 psi.. BUT! When I reset the ecu there goes the boost a little lag because of the intake and no TUNE car idle okay had to change a coil pack a few weeks ago was miss hiring but no code was on so I just changed one and it stopped, going to get the other three before I tune the car..

But after that that's when I been having this boost problem
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Old 04-25-2014, 10:14 PM   #20
Ruzty1311
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You've ran your car for two years without a tune or???? That's mistake #1 if that's the case...you're bound to run into some sort of issues without a tune for those mods...get a protune and it should fix your issues
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