tvanlant

iTrader: (4)

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.

Bob@BruteSpeed

iTrader: (16)

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

BLNLS1/RX7

iTrader: (2)

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

BLNLS1/RX7

iTrader: (2)

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?

tvanlant

iTrader: (4)

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

BLNLS1/RX7

iTrader: (2)

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.

tvanlant

iTrader: (4)

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.

BLNLS1/RX7

iTrader: (2)

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

Bob@BruteSpeed

iTrader: (16)

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

Bob@BruteSpeed

iTrader: (16)

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

tvanlant

iTrader: (4)

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?

BLNLS1/RX7

iTrader: (2)

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.

tvanlant

iTrader: (4)

picture or link to the intercooler?

Pictures of the engine bay?

BLNLS1/RX7

iTrader: (2)

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.

Bob@BruteSpeed

iTrader: (16)

The GTO crank pulley is 7.00" in diameter. Bob

Bob@BruteSpeed

iTrader: (16)

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

BLNLS1/RX7

iTrader: (2)

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.

Bob@BruteSpeed

iTrader: (16)

Ah, that makes sense. Bob

BLNLS1/RX7

iTrader: (2)

Intercooler looking up from garage floor.

BLNLS1/RX7

iTrader: (2)

Thanks Bob. Yea this is the old set-up with the D1.