Z06Vette.com - Corvette Z06 Forum

**MikesZ06** · 11-14-2002, 08:22 PM

For the record, I have indicated in a couple of previous posts that I had experienced no belt slippage with my ATI.
Was able to have a short session at the track last Sunday and am fairly certain I'm getting quite a bit of slippage due to 1/4 mile mph's. Best run was only 11.665 and that was with a 1.730 60' and a 1/8 mph of almost 100. 1/4 mph only 121.75 and I know this thing should be in the high 120's or low 130's for the 1/4.
Talked to the tuner and they are pretty certain it's the belt.
Taking it back to them on the 9th for guages install, new fuel management system and upping boost to 10. They also have some ideas on eliminating the belt slippage.
If anyone is interested, I will keep you posted on progress.

Baron · 11-14-2002, 08:31 PM

Quote:

Originally posted by MikesZ06
this thing should be in the high 120's or low 130's for the 1/4.
Talked to the tuner and they are pretty certain it's the belt.
Taking it back to them on the 9th for guages install, new fuel management system and upping boost to 10. They also have some ideas on eliminating the belt slippage.
If anyone is interested, I will keep you posted on progress.

Definitely interested

WA 2 FST · 11-14-2002, 08:49 PM

With 576rwhp (assuming the peak is made BEFORE 6500rpm...if its still going up at that point, then you are not truly utilizing all the power there) in a 3300lb car (assuming 200lb driver), you should be at 134-135mph easily.

Belt slippage is not uncommon with some of these blowers. It was easier to address when the companies used a _seperate_ belt for the blower drive...and left the stock S-belt to drive your accessories all alone. With the packaging of these new motors, it is really impossible to do that, so what you end up with is one long belt driving everything.

Belt dressing (VHT) works pretty good, but it will shorten the life of the belt, too.

**MikesZ06** · 11-14-2002, 08:56 PM

Wes, I've been using some belt dressing (Tire Claw) and I think it's worked up to a point. One of my tuners employees was at the track and he saw my 1/4 mph. They feel fairly certain I'm getting a lot of slippage

They also felt fairly confident they could do something about it so I'll just have to see, I guess.

WA 2 FST · 11-15-2002, 08:15 AM

I agree its slipping, Mike. No doubt about that. MPH should, and will be

, higher once that's worked out.

tonybrasco · 11-15-2002, 08:35 AM

mike lol im going ot get that that katech tensioner installed today ..... when u bring ur car to the shop please keep me informed on how they will eliminate the slippage.... i had the same thing 119 trap speed when i shoulds be in the upper 120's ...thanks mike

tonybrasco · 11-15-2002, 08:36 AM

oh i forgot to add if u want to check for belt slippage look for black dust everywhere..... there was tons of black dust on my little light under my hood

**MikesZ06** · 11-15-2002, 08:52 AM

Tony, haven't seen the black dust yet but my 1/4 mph and my SOTP feel tell me I'm not getting full boost at higher speeds. I'll let you know what they do to correct it.

22655TD · 11-15-2002, 09:28 AM

does belt dressing work on tires for slipping??

ZO6/Les · 11-15-2002, 09:37 AM

Mike,

Tape a piece of paper to the steering wheel which reads:

" Note To Self: Keep the fun pedal ALL THE WAY to the floor until I see the trap lights".

AKA belt slipping is a common problem. Gatorback Goodyear belts are the best, make sure you are going with as many ribs as possible. You say you are increasing boost - hopefully with a larger crank pulley, not a smaller blower pulley? The slipping is usually at the blower pulley so keeping it larger and changing boost through increasing the diameter of the crank pulley is the way to go in my book.

Les

**MikesZ06** · 11-15-2002, 10:05 AM

Quote:

Originally posted by 22655TD
does belt dressing work on tires for slipping??

Honestly don't know. My tuner recommends tire dressing (Tire Claw) to lessen the risk of belt slippage.......go figure

**MikesZ06** · 11-15-2002, 10:10 AM

Quote:

Originally posted by ZO6/Les
Mike,

Tape a piece of paper to the steering wheel which reads:

" Note To Self: Keep the fun pedal ALL THE WAY to the floor until I see the trap lights".

AKA belt slipping is a common problem. Gatorback Goodyear belts are the best, make sure you are going with as many ribs as possible. You say you are increasing boost - hopefully with a larger crank pulley, not a smaller blower pulley? The slipping is usually at the blower pulley so keeping it larger and changing boost through increasing the diameter of the crank pulley is the way to go in my book.

Les

Les, I think they will be using a larger crank pulley but I'm not certain.
May also be going from a 6 rib to an 8 rib. Again, not sure.

Keep the fun pedal ALL THE WAY to the floor until I see the trap lights". ....Keep the fun pedal ALL THE WAY to the floor until I see the trap lights". ....
OK, I think I've got it now

tonybrasco · 11-15-2002, 03:29 PM

but if u go to 8 rib that means u have to change all the pullies and that sucks i hear its like $ 1200 to convert to 8 rib.... i have also heard they sell a bracket which spins the sc head unit in a different positon which stops the belt from spinning but that is also 500 bucks..... i think we should call up procharger and complain... those 8 rib pillies should be included... dont they do test... if everyone is having this prob ,didnt they....mike if you want we can call procharger and complain... we need couple of more people to call as well..... if u want to do something like this we can start a post : attention all procharger users and list the problems so people can call and maybe procharger will take care of the problem.... just an idea

jnation · 11-16-2002, 12:00 AM

I am getting a larger pulley to wrap more of the belt around the ATI. The problem is that only 1/3 of the belt meets the ATI pulley. We are wrapping that bitch all the way down the pulley now. When it spins the belt HAS to torque it 8-ribs and tight as shit. Watch my car go.

My next dyno will POP 680rwhp--possibly 700rwhp. Watch.

That spray on juice is crap. Just gums up the grooves.Big Numbers

WA 2 FST · 11-16-2002, 12:41 AM

Jeff,

I don't know what you're spraying on, but I have used a product called "Insta-boost" which was actually developed by a guy I knew who was a great tuner in Dallas years ago. It does work, and prevented you from having to overtorque the belt.

I have to say guys that I am honestly AMAZED that Procharger didn't design it with an 8-rib belt. They have been in this game long enough to "know better". I had the 100th kit that Vortech produced...this was back in '92. 10 years ago a lot of these EFI blowers were in their infancy. We all had 6-rib belts and they were slipping then...and we were only spinning 5500rpm with our little stock 5.0 Mustangs. Within several years Auto Specialties came out with 8-rib conversions and since then Vortech used AS pulleys in their kits, and sold the conversions as upgrades to current owners. An 8-rib belt will solve a lot of problems. Some guys use 10-rib belts or cog pulleys (harder on the blower during decel, as their is ZERO slippage).

With the rpms that a Z06 spins efficiently, I would think an 8-rib would be imperative.

If Vortech or Paxton or anyone else is offering a 6-rib in their kits, then I'm shaking my head at them, too.

These people should just flat out know better. It's a shame. But you guys will get it worked out and be very pleased with the results...like Jeff.