07VistaChicago

So I did a couple 4th gear pulls on the highway and once I reached 4000 rpm the rpms stopped climbing like the belt was slipping, lack of fuel, or something. I know I have some clutch slippage when I WOTin 5th gear, but also get some vibes in 5th when I get into it (don't know if that is a symptom, normal, or something entirely different). Any insights?

odel

Most likely belt slippage. You have the expensive way to fix this with the Steeda belt tensioner (but you'll need a tune update as it increases the boost) or the cheap way (less than $100) with a regular belt tensioner. Any good mechanic can do this.

07VistaChicago

Yeah I can replace the belt tensioner, but will I end up with the same problem? The car only has 16k miles on it and the belt tensioner.

hammeron

yep, something isn't right....

07VistaChicago

Also the car is not indicating any codes, goes through the rpms fine in all other gears

Doogie65

Might be worth while and fairly cheap to install a new belt. Not sure how long they are supposed to last, but with 16K on it, maybe it is slightly stretched???

onederful100

dont think its belt slipping. if it were, the rpms would still climb, you just wouldn't go any faster. i felt my clutch slipping before i changed it and the rpms climb but no power as well. not sure what your problem is....does it bog at 4k rpm? or any other symptoms? boost is ok? so if you floor it in 4th the rpm's just stop at 4k? how's the a/f? are you going WOT in the other gears and no problems?

07VistaChicago

Well I would think the opposite, if there was belt slippage on the SC the boost would drop and the rpms would slow on their rise which is what seems to be happening. Clutch slippage I agree would increase engine rpms with no increase in drivetrain speed. I do have that when I WOT in 5th. All other gears seem fine.

Diabolical!

Or go the mid-price way, a Thump_rrr billet tensioner.

I agree that it is most likely belt slip. Second most likely issue is clutch. Also, and I hate to even ask this, did you replace your COPs?

07VistaChicago

COPs are stockers. The car had all of this on it when I got it except the shifter.