Ls6, Ls2, Fast
Thread Starter
Burning Brakes
Joined: Jan 2007
Posts: 833
Likes: 2
From: Boca FL
Ls6, Ls2, Fast
Last edited by coanan; Jan 12, 2008 at 11:59 PM.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Good info. I'd like to point out that this was with a stock motor with stock cam and heads. The FAST90/90 performed well, but it didn't get a chance to shine because the cam was done before the manifold reached it's power band. It pretty much shows why you would be wasting your money by going with a FAST on a stock motor unless you plan on increasing the high rpm airflow.
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The LS2 has been shown to be a dog on 5.7L motors, and the tables revealed that fact, but I noticed it performed much better on the LS2.
It's kind of interesting because the LS2 uses 243 heads and a bigger cam than an LS1. Not sure if it's the same as an LS6. That would explain the higher numbers for it on the LS2.
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I switched to an LS6 manifold after I did my headers for my 'bolt-on' stage and it made a very big difference. It almost felt like it doubled the power increase from the headers.
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The LS2 has been shown to be a dog on 5.7L motors, and the tables revealed that fact, but I noticed it performed much better on the LS2.
It's kind of interesting because the LS2 uses 243 heads and a bigger cam than an LS1. Not sure if it's the same as an LS6. That would explain the higher numbers for it on the LS2.
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I switched to an LS6 manifold after I did my headers for my 'bolt-on' stage and it made a very big difference. It almost felt like it doubled the power increase from the headers.
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
1. Today, guy states ZERO change in performance w/FAST (unported)
2. Data in past indicates loss of power, when intake first came out.
3. Tony M and the like claim increases only in power.
4. Vengeance Racing has increases in power.
5. Other famous porters intakes resulted in loss of power according to local performance shop.
As a whole most of the data indicates a slight loss of low end power with gains in high rpm area. What I have not seen are ET comparisons from one intake to the next.
I've got #4 on order, so soon enough you guys will get:
1. Unbiased dyno results 1 intake to the next.
2. Retuned results.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
The other thing to be very careful of is port mis-match. I am running Dart heads, their intake port is very narrow and I ran into a flow problem as a result. Bottom line, the system as a whole should be examined.
