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slipping clutch

skyline33
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skyline33 Grand Master

skyline33

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Posted

I just installed a boost controller and running 1 bar, tonight i took the car out for a spin and when i'm driviing in 3 or 4th the car just slows down as if its down shifting or something (for 2secs) then comes back to normal (it actually did it a few time).

the car is still running the stock exhaust, apart from the boost controller and a blitz bov the car is stock.

I'm guessing slipping clutch, but i've never driven a car with a slipping clutch, any ideas??

also what does a slipping clutch feel like??

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skyline33 Grand Master

skyline33

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Originally posted by meggala

there is also a boost cut at aoround 12 psi or so which could be causeing the problem

thanks meggala, that actually sounds right, i'll run 0.8 until i put the exhaust on. how does one overcome the boost cut off

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Zahos Mentor

Zahos

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when you say it feels like the brakes have been applied, is it like someone has SLAMMED them on hard, or is it like they are being applied gently?

I'm guessing it's the first, as at 1 bar, you are definately hitting the boost cut, and with a std exhaust and standard intercooler, your AFM will be maxing out! If your intercooler is stock, and you have set the ebc for 1 bar, your turbo is producing almost 2 bar, to make up for the preassure drop accross the intercooler!!!!

Keep it at this setting and your turbo wont last long at all, especially with a SII R33.

Wind it down to 0.7 bar (no more), and let us know how you go...

Even when you upgrade your intercooler and exhaust (and intake), I would not be going past 0.8 bar with the stock turbo.... if you want it to live...

Zahos

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raist60 Community Regular

raist60

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I ran 14 pound on my stocky for bloody ages and nothing happend. And if its not your clutch i dont know how or why someone said it was but its not. Slipping clutch the car will just rev up but wont pull. From what your saying its not reving up. So it aint your clutch.

Either boost cut or your talking bout the standard R33 standard ecu flat spot that we have all enjoyed.

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skyline33 Grand Master

skyline33

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thanks everyone for your replies.

well it appears that it was hitting the boost cut off, cause i reduced the boost to 0.8 and increated the duty cycle and it seems fine. but there is a noise from the boost controller unit in the engine bay when it hits boost, apparently thats normal any comment would be appreciated

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FIL Enthusiast

FIL

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Posted

boost cut often feels like you've hit a brick wall... the motor loses revs really quickly, and it can shake the whole car up if your pushing hard....

as for the boost controller... it would be bleeding air off when you reach the stock boost level, as it needs to maintain a level below stock boost at the wastegate, but the boost that the controller (between manifold and wastegate) is seeing is still rising... so there will be air being released... it should be a reasonably quiet sound... but u might be able to notice it...

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Guest INASNT

Guest INASNT

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i bet your car feels quicker with 0.8 bar boost than at 1 bar with the stock cooler and exhaust, coz at 1 bar with stock cooler and exhaust u r producing more heat than power, and u can say bye bye to your turbo as it will be running nearly 2 bar as Zahos said!!

people still dont understand that more boost doesent always mean more power!:(

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