How much boost is needed?

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Apr 12, 2006 | 01:00 PM

Cbrakllr

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From: Jupiter, Florida

How much boost is needed?

I was wondering how much boost it will take to get 600-650 hp from an Ls1 with longtubes, true duals, lq9 heads, Superchager cam?

Apr 12, 2006 | 03:23 PM

Project GatTagO

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From: Little Austin

Non boosted HP x (boost/14.7) - HP loss for supercharger = Final HP

sounds right....

Andrew

Apr 12, 2006 | 03:30 PM

LSs1Power

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From: VA

Check Sig for results. 10-11psi should put u around 600rwhp on a dynojet or 560rwhp or so on a mustang dyno.

Apr 12, 2006 | 05:38 PM

C.W.A

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From: texas

I'm running 5psi, d1sc with restrictor from ECS 583rwhp!

Apr 12, 2006 | 08:45 PM

LSs1Power

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From: VA

Quote:

Originally Posted by C.W.A

I'm running 5psi, d1sc with restrictor from ECS 583rwhp!

Whats your crank and SC pulley size? What RPM did you stop the dyno run?

Apr 12, 2006 | 09:18 PM

C.W.A

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From: texas

4.75 on the SC pulley and I think 8.5 on the crank! the d1 has a restrictor also!

I'm not possitive on the crank pulley. I think you and I have talk about this before! They took it to 6200 and the AF went lean so they stopped!

Apr 12, 2006 | 09:52 PM

LSs1Power

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From: VA

Quote:

Originally Posted by C.W.A

That will be around 45500 RPM from the D-1SC. I saw 11psi (13psi without the hat) from running my blower at 46300 RPM or so. So i guess there are two possibilities for why you are getting 580rwhp while showing 5psi on the gauge:

1. Messed up gauge.... You need to replace it or try another one just to check if its working right.
2. The heads and cam you are running are flowing soo well that you dropped 4-5psi.

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Apr 14, 2006 | 09:24 PM

LSs1Power

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From: VA

Quote:

Originally Posted by C.W.A

what do you mean dropped 4-5psi

checked the gauge and it's working fine!

I mean that at your RPM blower speed you should be seeing anywhere between 8-10 psi at the least. As you know psi is a reading of restriction at the intake manifold. Since you have heads and cam that might affected the boost reading because the engine is taking more air in hence the lower boost readings. Great numbers none the less