efini_8

Hey guys, i haven't posted for awhile, so here is my post. Unfortuneatly, it's not good news.

Ok, i got the turbo installed in Late Aug. I had a problem w/ overboosting, i have no turbo boost controller, so i don't know what the deal is. Under full throttle, i'm boosting at 9psi max, 10psi max, or 11psi max. depends on how i warm up the car... it sounds weird, but this is what it does... Usually, it's always at 10-11psi under full boost.

But this isn't the main problem i'm dealing with.

In 4th, 5th, and 6th gear, when i'm at around 3k rpms, and i give the car wide open throttle, as soon as the boost is maxed, the RPM's start peaking allll the way. Usually, it went from 3k -5.5k and went back down again according to where the car was picking up speed, but now, in 5th or 6th gear, under WOT, the car's rpm's just rise real fast (not as fast as if i was flooring it in neutral), but significantly fast for me to see that the rpm's are rising much faster than the acceration of the car...

What can this be a result of? Is my clutch finally giving out?

Anyhelp would be greatly appreciated guys.

Rotary Rasp

iTrader: (2)

I think you need to reword your post. I'm really confused.

Blue87Sport

The key phrase in that post is: "the rpm's are rising much faster than the acceration of the car."

If the engine speed is increasing without a corresponding increase in the speed of the car then either your clutch is slipping or the the wheels are spinning. Since its happening in a high gear, it is the clutch slipping.

Do you notice a burning (clutch) smell? Is it worse going up hill?

Sounds like its time a new clutch with more clamping power.

zoomzoom_8

problems with the overboosting can be solved by adjusting the waste gate acutator arm if you have not solved that, but yea sounds like a clutch problem, ever slip when just pulling away?

efini_8

Hey zoomzoom... I don't know how to adjust the waste gate acutator arm. From a stop, no, i really don't have problems pulling away... but on the high gears, yea, the engine speed increases significantly faster than the mph speed.

Also, no, i do NOT notice any clutch burning.

However, my blow off valve makes a weird noise when it is not fully boosted. It kinda sounds like a pss pss pss pssssssss.... instead of the normal, Pishhhhhhhhhh (whistling noise)

Does this help?

zoomzoom_8

waste gate acutator is what that vacuum line connents to on the turbo itself, when you look at it, it has an arm that goes to the lever that opens/closes the wastegate, if you disconnect it, it screw in and out to adjust the boost, andrian-1 i think taught me that so you might want to pm him.

sounds like a clutch with the rpms going up, do this, put your emergency brake on tight, put it in first gear and dump the clutch, if it does not cut off your clutch is really bad.

iridearocket

If your rev's are accelerating faster than the car, your clutch is slipping. (or your tires are lighting up) You can test this by pushing hard on the throttle until it starts slipping, and then slightly back off. If the revs back down to the point at which you think the car is accelerating as the same rate, then it is quite certain that your power is exceeding the limit of the clutch. It is possible that some tires will start slipping without making noise, but unlikely that it will do that in the top gears. (you need so much HP to break an *** end loose in 6th)

However, first you need to set your turbo to be where you want it with the proper boost, and then see if your clutch still slips. There is no point changing the clutch is you plan to back your boost down a little. Go to a dyno and try to tune the turbo for a good band of power from 5000 revs and up, rather than for peak hp at 8000 revs which may break the clutch loose.

Brice-RX8

But if the clutch is already slipping, then it has probably already been glazed over and I doubt will ever be any good again. Just a thought.

kw1k

if your clutch is slipping go for it.

efini_8

dfajdafjadksf... i hate life.

yea, the clutch seems to slip. but it doesn't slip in 1st or 2nd or mostly 3rd... this sucks.

ShadowX

There's more torque (from trying to turn the tires because of the gear reduction) on the clutch in higher gears, so that's probably why it's not as bad in lower gears.

Your overboosting could be several things, from a vacuum line to the way your exhaust is setup. Not saying don't try to fix it, you just need to look at other things beside the wastegate.