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OREX

By OREX,
in Forced Induction Performance

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OREX Collaborator

OREX

Posted
Posted

Guys i need some feedback from professionals such as yourselves.

My R32 GTS4 is running a HKS 2530.

Bigger injectors and fuel pump.

Apexi front mount.

I've got a super strong clutch.

Old style Apexi AVCR.

Only running 10psi.

The other day i was driving like normal, seriously, and the tachometre needle just jumped over 8 thousand revs as if i had clutched in, but i haden't. I pulled over and checked what i could but there was nothing visibly wrong. i started the car again and it drove fine. it's as if the engine is boosting like a million pounds without fuel. I checked the wastegate actuator line, no problem and all hoses are fine, clutch engages all gears fine, no diff noise, no gearbox noise, just this scary overboosting (imo).

If anyone knows what i mean please help a brother out!

Peace.

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OREX Collaborator

OREX

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thanks guys. yes the car does move while the problem is occuring but feels VERY slow, as if there is NO boost at all. as for clutch slippage there has been no such action, fresh clutch very strong. I was thinking about the boost controller solenoid but i don't know how to fix one if possible. thanks again for your valuable input.

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rbs13 Community Regular

rbs13

Posted
Posted

replace it. heard a bit about the avcr ones.. not the best or something.. dunno how true it is.. also heard that they are the same as power fc ones? i know a lot of people who use AVCR and have NO problems but maybe heat got to it.. ??

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OREX Collaborator

OREX

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thanks fellas i value your input. i was thinking of replacing the AVCR with a new one but it's $1000 i think? and no my turbo's fine, thanks i checked (lucky!).

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WazR32GTSt Grand Master

WazR32GTSt

Posted
Posted

sounds like a slipping clutch to me. how long ago did you change it? with a stock one or aftermarket one?

if it were the boost solenoid going then that doesn't explain why it revved to 8000rpm suddenly it would only explain the loss of power.

maybe a problem with the diff? sounds something drivetrain-related as if the engine lost load and just revved freely...

let us know how you go,

Waz.

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OREX Collaborator

OREX

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thank you ed and waz. these things sound scary to a novice like me and i'm not so sure i know how to acurately check these things. the clutch is probably a year old and feels really grippy and always did before the problem started, it's a heavy duty item. the problem happens all the time now. any ideas how to check gearbox and diff?

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tridentt150v Grand Master

tridentt150v

Posted
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Does it happen when you accelerate? or just after you change gears? turn corners? etc etc

Does it happen when you are doing a certain speed or rev??

Or does it just happen any time on a straight bit of road at normal speed [and you may have been sitting on the same speed for a while?

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OREX Collaborator

OREX

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ooh so many questions. okay, car starts, clutch fine into gear, accelerate fine up to 1500rpm and then it's as if i've clutched in and the pressure of my foot on the gas pedal sends the revs flying. happens through corners and start stop etc. kind of goes away after a good warm up, say 15 mins. after this happened a few times i didn't want to damage the car further so i haven't taken it anywhere yet.

Thanks trident.

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Roy Grand Master

Roy

Posted
Posted

When the engine revs increase, are you braking out into wild wheelspin? It is physically impossible for your revs to increase so dramatically without your roadspeed inceassing also.

So you are either braking into pretty wild wheelspin (i think you would have noticed that by now :) ) or you have a drivetrain problem, im assuming your clutch. :Oops:

You say it happens in 1st gear, does it happen in say 3rd gear going up a hill?

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OREX Collaborator

OREX

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thanks roy. yeah no wheelspin, and it does happen in any gear. as for my clutch it was working fine for a year and then one night while in 5th gear on a freeway it just revved up. the clutch engages all gears easily so if anyone could tell me how to check my clutch i would greatly appreciate it.

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ferni Grand Master

ferni

Posted
Posted

Orex: definatly your clutch is slipping, in higher gears, 3rd, 4th etc... you will find it just revs up without going anywhere...

time for a new clutch, quick

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