slipping clutch

[skyline33]

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??

[meggala]

the car feels liek you reving and its not gaining speed

Iwouldnt run 1 bar with a stock exhasut though

.8 should be heaps

[meggala]

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

[skyline33]

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

[Neil]

Try taking off in 3rd Gear,,,that will tell you straight away if your clutch is slipping. All revs,,,little movement.

Neil.

[skyline33]

it actually drive normal then all of a sudden it just feels like brakes have been applied then jerks then back to normal. I hope that explains it

[G0DF4Th3R]

sounds like a slipping clutch haha worse feeling in the world aside from blowing ure engine...all of us have felt it including me...

[Zahos]

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

[skyline33]

yeah, i'm running stock intercooler. i'll give it a shot and let you guys know

[raist60]

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.

[Xeron]

Go into 4th gear and rev to aproximitly 2000rpm and drop the clutch, if you dont stall instantly then your clutch is slipping. Yours isn't but thats always a good test to know for when ur buying cars and stuff.

[skyline33]

thanks man i'll give it a shot

[skyline33]

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

[FIL]

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...

[Guest INASNT]

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!