Bob@BruteSpeed

iTrader: (16)

On my '99 Camaro I was seeing 20 psi of boost with an F-1A. The engine was a 408 with 9.5/1 compression, AFR 225 heads, our blower cam, and a Vic Jr intake. This was with running through the truck inlet hat and an air filter. The F-1A takes a little more power to turn it, so belt slippage can become a problem, however, it has a 5.40/1 gear ratio while your D-1SC has a 4.10/1. With the 5.40/1 gear ratio you don't run as small of a blower pulley, and larger pulleys give better belt wrap. I was using a 3.90 pulley on my Camaro. As you add more boost, the point where it starts to come in drops down as the blower is spinning faster at any given rpm. Bob

+badss+

iTrader: (12)

just to give you an ideal i just ran a 10.74 at 138 mph 3rd pass first time out car just got finished with engine and procharger swap its so nasty lol the f1a sounds like a f16 for sure
but love it.
check the link to get a feel for the f1a..
https://www.facebook.com/brandon.ray...9?notif_t=like

Stelth

Hi Bob

Great info ,

What belt and crank pulley size was this achieved on and how much power did it show?

I bought an F1A the other day locally and swapped out my old D1SC .

Maxed out with a 3.9/7.5 pulley combo, I believe i have an issue due to the fact it produced almost identical power and boost figures as the D1.

I have posted on other thread with someone with a similar issue.


Any further information would be greatly appreciated ,


cheers

Bob@BruteSpeed

iTrader: (16)

I had a 3.90 blower pulley and a 7.65 crank pulley. We saw 18 to 20 psi of boost with this combo. The 5000 stall converter wasn't going to produce good dyno numbers. It takes around 1000 hp for a 3500lb vehicle to run a 9.0 in the 1/4 mile. Bob

Stelth

that is one very fast Camaro !!!

Hmmm, now i really suspect i have an issue ,

416 LS3 , ported LS3 heads , GT7 cam , 9.5 comp big exhaust

16 psi at 7000rpm 635 hp (Dyno Dynamics) no filter on the back.

This cant be right for an F1A maxed out and $3000 later

thanks for the info .

cheers

Bob@BruteSpeed

iTrader: (16)

Unless you're up in a higher elevation, or a really low compression ratio, you do have a problem. I'm at 800 to 900 ft. Bob

Stelth

I am near the coast so very low, my compression should be 9.5 with the 68cc heads and 4.07inch -20cc pistons at 0 deck with the .042 gasket.

I suspect a blocked intercooler at this stage ,

cheers

Bob@BruteSpeed

iTrader: (16)

9.5/1 is what I had too. I would agree on the intercooler being the first place to look in to. Bob

Stelth

Thanks Bob !

Stelth

Hey Bob ,

Problem worked out as we suspected!

24 psi reading before the cooler , 16 psi after the cooler , with out filter.

Getting custom larger flow intercooler made up ,

cheers

Bob@BruteSpeed

iTrader: (16)

Good deal, you found the problem. You'll have to post up after you get the new intercooler installed. Bob

Stelth

Sure,

I will have to work out how much of a restriction i will still need to add after the new intercooler by adding a filter.

Bit cautious on the boost level and also how much a stock alloy block can handle.

Cheers