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dyno and clutch slippage

bazr33
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bazr33 Mentor

bazr33

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Hey guys got my car dynoed at F.I.S.T today

my dad took it in cause due to work, so i didnt get to speak with them

the dyno graphs b4 the car was tuned, was suprsing

only did 116rwkw all the shit was all over the joint.

thats how badly APC tuned the car,

car was tuned, timing adjusted and boost changed to 8 psi

if want some pics of the dyno graphs ya can email me.

[email protected]

after 2 and half hours, and also findin a big leak or somethin on the standard blow off valve and sortin out everything

it was dynoed at 170.1rwkw, on 8psi, smooth as power line.

on that dyno the clutch was slipping at top end so still could of got more.

i just got my car converted to manual, but have had issues with clutch slipping.

my theory is that it wasnt bled properly and could still be air in the system .

as its been adjusted 3 times as the clutch has been engaging at each end of the clutch pedal

and there has been heaps of free travel, then goes back to none at all. and been adjusted each time. Getting real sick of the shit cause havent even got a chance to get a good run in the car.

the gearbox is in good condition,

no crunchin on gears at all,

when the pedal has been adjusted , every is real smooth and awesome to drive

but then a couple of days later it adjusts itself and theres either no free travel or heaps, and engagin at one of the ends of teh pedal.

Brand new clutch ( heavy duty)

and has a 200b slave cylinder, as being told they are the same as a skyline one.

Anyway happy how it idles and runs jsut the clutch at the moment.

and was happy with the dyno even though the clutch did slip on the dyno.

Hopefully when i get all teh shit sorted i'll take it down the quarter .

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https://www.sau.com.au/forums/topic/78947-dyno-and-clutch-slippage/
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BHDave Grand Master

BHDave

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If you have air in the line the clutch will try to stay engaged rather than disengage.

I ran into a problem a couple of months back when i changed my master and slave cylinders. The master wasn't retracting far enough and maintaining pressure in the system. As a result as the temperature of the fluid got hotter (say from sitting at traffic lights for a couple of minutes) it would partially disengage the clutch which resulted in slip when accelerating away.

Easy one to check too. Jack the car up, grab the piston on the slave cylinder and see if you can push it back. If you cant then thats your problem, if you can then you get to keep looking.

bazr33 Mentor

bazr33

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Posted

trying what bhdave said today see if i can move it

just the thing is that theres abosolutley no free travel and the clutch is harder then usual to push in , so i dont know if im goin to be able to push the piston back .

give it ago though

and i dont know how to post the dyno graph up

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