Head pulley size.

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What diameter is your crank pulley? Engine RPM? What engine?

It seems like you're spinning the blower awfully hard just to make 17 lbs. I run a 5.25" blower pulley and make 18 lbs.

Jul 18, 2016 | 08:32 AM

#22

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From: Roanoke, IN

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Originally Posted by BLNLS1/RX7

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?

I didn't know Brent had another surgery, is he doing okay?

I got an Gen V LT1 that is going into the Vega, I just haven't had enough time to do much with it yet. Tony got back from Afghanistan and bought a wrecked Wrangler JK. We took the body off swapped frames, and installed an LS iron block in it. Less than six months after Tony was back he headed back to Afghanistan. Bob

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Jul 18, 2016 | 10:30 AM

#23

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From: Fishers,IN.

Quote:

Originally Posted by tvanlant

What diameter is your crank pulley? Engine RPM? What engine?

It seems like you're spinning the blower awfully hard just to make 17 lbs. I run a 5.25" blower pulley and make 18 lbs.

It is a 6.0lt. iron block bored .60 over.The head pulley is 3.85.

Jul 18, 2016 | 10:34 AM

#24

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From: Fishers,IN.

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Originally Posted by Bob@BruteSpeed

He had to go back in again ( 3rd ) for repairs from his original surgery.He will be on limited work for awhile until he gets healed up.Well I guess I wont see your Vega at the track this year.Did Tony re-enlist?

Jul 18, 2016 | 10:51 AM

#25

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Quote:

Originally Posted by BLNLS1/RX7

It is a 6.0lt. iron block bored .60 over.The head pulley is 3.85.

Yeah, we need to know blower speed. Crank pulley diameter, engine RPM?

Jul 18, 2016 | 10:57 AM

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From: Fishers,IN.

The F1-R is rated at 68,000 with max. boost of 38lb.Crank pulley is 7.625.Engine RPM was 6700 on this session.Do not know what the blower speed was.

Jul 18, 2016 | 11:10 AM

#27

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Blower speed = RPM X CRANK PULLEY DIA. / BLOWER PULLEY DIA X STEP UP RATIO

For yours: 6700 X 7.625 / 3.85 X 5.40 = 71,655 rpm.

You are spinning the blower way too fast. And you have a huge problem elsewhere. The F1R will make a ton of boost at max RPM. I'm spinning my F1R to 57,600 rpm and making 18 lbs.

Jul 18, 2016 | 11:27 AM

#28

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From: Fishers,IN.

Quote:

Originally Posted by tvanlant

Don't you have to factor in the tire size?

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Jul 18, 2016 | 11:37 AM

#29

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From: Roanoke, IN

Quote:

Originally Posted by BLNLS1/RX7

Man, that's too bad, I feel bad for Brent!

Tony's over there as a contractor, it's his third or fourth time as a contractor. Bob

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Jul 18, 2016 | 11:38 AM

#30

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From: Roanoke, IN

Quote:

Originally Posted by BLNLS1/RX7

Don't you have to factor in the tire size?

Nope, tire size doesn't affect impeller rpm Steve. Bob

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Jul 18, 2016 | 12:46 PM

#31

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If you share more information about your setup, we can help you figure it out.

I would not run the car any more until you figure it out or you will start breaking stuff.

1st thing - put your 4.00" pulley back on (or a 4.13 or 4.25 if you have one). With the blower at max rpm, it should make around 30 psi, depending on what heads, cam, intake etc.

What intercooler do you have? Pictures of it?
What do you have for an inlet?
Exhaust?

Jul 18, 2016 | 01:00 PM

#32

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From: Fishers,IN.

Quote:

Originally Posted by tvanlant

intercooler is 31 X 12 X 4 and is new.The heads are TEA Stage 1 The intake is a LS2 with a 92 MM throttle body.There was no room for a filter on blower.Lingenfelter blower cam.The header were made for the application.

Jul 18, 2016 | 01:26 PM

#33

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picture or link to the intercooler?

Pictures of the engine bay?

Jul 18, 2016 | 01:53 PM

#34

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From: Fishers,IN.

Quote:

Originally Posted by tvanlant

picture or link to the intercooler?

Pictures of the engine bay?

Unable to locate paperwork on the intercooler but it was from E-Bay and I think it was around $200. Can take pictures later today.

Jul 18, 2016 | 02:18 PM

#35

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From: Roanoke, IN

The GTO crank pulley is 7.00" in diameter. Bob

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Jul 18, 2016 | 02:33 PM

#36

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From: Roanoke, IN

This picture of Steve's car was most likely after we had installed the D-1SC at the old EPP shop. Bob

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Jul 18, 2016 | 02:34 PM

#37

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From: Fishers,IN.

Quote:

Originally Posted by Bob@BruteSpeed

The GTO crank pulley is 7.00" in diameter. Bob

When I went to the F!-R from the D1 I had to switch out the crank pulley to a 7.625 to be able to run the 12 rib belt.

Jul 18, 2016 | 02:35 PM

#38