Head pulley size.

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Jul 5, 2016 | 03:02 PM

BLNLS1/RX7

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From: Fishers,IN.

Head pulley size.

Switched my 4.0 pulley on my F!-R ProCharger to a 3.85.After a dyno re-tune I took car to the track and was shocked that I had lost 1/2 second in the 1/4 mile.Made 5 more runs and every run was off between 4 tenths and 6 tenths.Cant figure was going on.

Jul 5, 2016 | 03:28 PM

Bob@BruteSpeed

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Steve, are you seeing black dust on the blower? With the GTO and an F-1R, I'd actually be surprised if you didn't get belt slippage with a 3.85 pulley. Bob

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Jul 5, 2016 | 04:20 PM

BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

Steve, are you seeing black dust on the blower? With the GTO and an F-1R, I'd actually be surprised if you didn't get belt slippage with a 3.85 pulley. Bob

That was the very first thing I though of.But the belt is not slipping at all.

Jul 5, 2016 | 06:54 PM

Bob@BruteSpeed

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From: Roanoke, IN

Quote:

Originally Posted by BLNLS1/RX7

That was the very first thing I though of.But the belt is not slipping at all.

I'd look for a boost leak Steve. You can cap the ends of the tubing at the throttle body and at the blower and put a tire valve in one of the caps and give it several psi of air pressure. Plumbing caps work well for this. Some people find pinhole leaks in their intercoolers, it can make a big difference though. A guy down in Mexico City, Mexico had a boost leak, I've have him try one thing and then another, it came down to his LS6 intake had become cracked internally. Bob

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Jul 5, 2016 | 06:56 PM

Bob@BruteSpeed

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From: Roanoke, IN

One other thing Steve, the air filter can become a huge restriction too. You have to be careful running without a filter to see if it's the problem, but it's been the problem on many cars. Bob

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Jul 5, 2016 | 07:16 PM

BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

Just put a new intercooler in.

Jul 5, 2016 | 07:17 PM

BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

One other thing Steve, the air filter can become a huge restriction too. You have to be careful running without a filter to see if it's the problem, but it's been the problem on many cars. Bob

No room for a filter.

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Jul 5, 2016 | 08:02 PM

BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

That would be the first place I'd look. Back at the old shop we had V6 Mustang kit that had a hole in the new intercooler. Bob

Will check it on Wed. Thanks Bob.

Jul 6, 2016 | 01:05 AM

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Blown06

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How are you verifying that the belt is not slipping?

Can we see a datalog of the boost curve?

Jul 6, 2016 | 11:02 AM

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BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Blown06

How are you verifying that the belt is not slipping?

Can we see a datalog of the boost curve?

Have had different ProChargers over the years and I look for any residule black dust or any other signs ( visual ) of the belt slipping.

Jul 6, 2016 | 04:47 PM

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BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

That would be the first place I'd look. Back at the old shop we had V6 Mustang kit that had a hole in the new intercooler. Bob

No leaks in the intercooler Bob.I would call ProCharge tech support but am always put on hold waiting for them to pickup.

Jul 6, 2016 | 07:42 PM

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BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by BLNLS1/RX7

Have had different ProChargers over the years and I look for any residule black dust or any other signs ( visual ) of the belt slipping.

You sure could if I had one.

Jul 15, 2016 | 12:29 PM

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BLNLS1/RX7

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From: Fishers,IN.

Got back on the dyno on Wed. and might have found the problem. Will take car to the track next week and see.

Jul 15, 2016 | 12:32 PM

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Bob@BruteSpeed

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Quote:

Originally Posted by BLNLS1/RX7

Got back on the dyno on Wed. and might have found the problem. Will take car to the track next week and see.

What did you find Steve? Bob

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Jul 16, 2016 | 06:30 PM

#16

BLNLS1/RX7

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

What did you find Steve? Bob

Went up to Leesburg IN. and had Justin dyno and data log my car since Brent is still recovering from his last surgery in June.Made 5 pulls and it appears that maybe the belt is slipping and was losing a couple lbs. of boost.The car was also running very rich.Made some adjustments and now I need to get to the track with it.How is your Vega coming along Bob?

Jul 17, 2016 | 01:11 AM

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Blown06

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Quote:

Originally Posted by Blown06

How are you verifying that the belt is not slipping?

Can we see a datalog of the boost curve?

Quote:

Originally Posted by BLNLS1/RX7

Have had different ProChargers over the years and I look for any residule black dust or any other signs ( visual ) of the belt slipping.

Quote:

Originally Posted by BLNLS1/RX7

Glad you got it figured out. Do you have any dyno graphs, power numbers or screen shots of the boost curve?

After they found the belt issue, what did they do to fix it?