OUTATIME GTA

I'm possibly getting some awesome belt slippage with my Procharger P1SC that I'm trying to remedy. Using their 3.7" diameter pulley, I show ~7.5psi on my pillar gauge, but on the dyno recently they barely measured 3psi. I've noticed some black film/dust on the head unit and bracket, indicating some slip I'm assuming. The current belt tension seems tight and when pressing down perpendicularly, it has barely 1/4" flex. I don't recall if it was a Gates, or an off brand. I may try a Goodyear Gatorback next. In addition to that, I was reading on the Reichard Racing ultra-grip pullies. Twice the price as a standard pulley and I've heard they can eat a belt if not aligned properly, but I wanted to know if they have any reviews in here. Any other suggestions to look into are welcome as well. Thanks!

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Current Collection: (See vBGarage for pics/details)

• '89 Trans Am GTA (L98) / '88 Firebird (Z20 Package) / '01 Trans Am (LS1)
  

Sonix

- How did the dyno measure your boost pressure? Where did they tie into? Same place your gauge pillar is measuring?
- Have you verified your belt alignment with a straight edge or anything like that?

Saabster

Belt slip on throttle lift off is normal. If it doesn't slip you risk damaging the gears in the compressor.

3rd gen Will

Are you running the 8 rib setup? Possibly moving over to the 12 rib would get rid of the belt slippage.

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1991 Camaro Z28 Black/Red Leather

350 TPI. Globe West Trac Pack, Koni Adjustables. Baer Front, PBR Rear brake, drilled/slotted rotors. 52mm TB, 255 pump w/ racetronix hotwire kit. 24# SVO's. Borla adjustable 3" cat back.

On the work bench:
ZZ4 Cam
Edelbrock headers
D1 w/ twin high flow intercoolers
Kenne Bell Boost-a-pump


2000 Trans Am White/Black Leather

346 LS1. BMR Sub Frames. Spohn Torque Arm, LCA's, Edelbrock Adj PHB. Eibach sportlines and Bilstiens. Baer Decelarotors Front/rear, EBC greenstuff pads. SLP lid, LS6 intake, Comp 224 cam. ASP UD crank pulley/balancer. Pacesetter headers, Borla Adjustable 3" cat back. Pro 5.0 Shifter, LS7 clutch. Nitrous.

OUTATIME GTA

Yes, they tied into the T where the boost gauge lines are. It's an electrical gauge btw. How is it the gauge would show 7+ and only measuring ~3 on the dyno?

I think the belt is aligned OK, but I do see a little white fray on one section, nothing major though. Mainly the black film makes me think it may be slipping at higher rpms. I am hoping a better belt and pulley helps, but not sure what else. I guess a boost leak is a possibility as well. How does 1 check for that, other than obvious connections in intercooling piping, etc.?

I'm using the 8-rib and it's not like I'm using a tiny pulley, I shouldn't have to swap to a 12-rib setup to see the correct psi.

Sonix

Perhaps your electrical gauge isn't properly calibrated? If two gauges measured something different, I wouldn't assume leakage yet, i'd check for a bad gauge. See how you can calibrate the gauge.

How long have you been running that belt? If you've got some white fray and only have a few thousand km's on the belt i'd be concerned about it being out of alignment. I'm assuming the white fray is on a side and not the underside?

OUTATIME GTA

Less than a year on the belt and yes the small segment I noticed was on the side.