From what I've seen so far, with both a 78mm and a 90mm throttle body, the FAST intake is marginally ahead of the LS6 intake, and both are well ahead of the LS2 intake, as far as air flow and power output on a stock LS1 or LS2 engine.

Has anyone done any hard data-gathering on intake & throttle body combinations yet on a stroker and/or forced-induction motor?

Trying to decide what to put on my 402 LS2.

 

i dunno bout the ls2 but the stroked/blown gen3's love the 90/90lsx manifold

 

Still looking for hard data on this. Anyone done actual tests yet?

 

Why wasnt the LSX more of an improvement? IE, bolted to head 320CFM flows
and runner length cut down enough to allow 5500 RPM TQ peak on large strokers and 7500 RPM HP peaks on large strokers?

 

they did a test in Hot Rod, and the LS6 produced 8hp and 16lb-ft with the LS6 tb over the LS2, and the LSX produced 7hp and 8lb-ft over the LS6. they made 499hp with a few other things. check their web site for the full article

 

Yes, I've seen the article in Hot Rod. I'm looking specifically for data on engines with BIG CUBES and FORCED INDUCTION. The results are likely going to be different than with Stock displacement and Normal aspiration.

 

i would guess it would just be amplified results of that being that the FAST 90 flows best, and better flow is better for big cubes and forced induction

 

With a 346 LS1, the LSX is actually WORSE than an LS6 for a street motor (which mine is primarily) and hardly worth the price to only get an extra 8hp above 5000rpms. The LSX is ONLY superior on a pure racer that sees nothing but high rpms, according to the data I've seen thus far.

Now, instead of everyone here just speculating, or talk about stock-sized NA LS1s, who actually wants to address my question with some dyno charts in hand?

Someone, please? I know there are some blown/stroked guys out there...........

 

on a larger than stock engine, the LSX has shown bigger gains over the LS6 all over the curve. i don't have dyno charts, but i have read alot

 

Phoenix57 - How much gain are we talking about? Single digit horsepower/torque, more than 20 hp/20 tq average? Please elaborate if you can.

 

Remember the LSX is a 3-piece manifold - not exactly the strongest for cars with big boost... especially for the gain. Just my $.02

 

the LSX also has a blow out disc option for if the pressure exceeds 30psi.

 

Does that mean it will hold 29 psi boost without leaking or that a backfire will have somewhere to go? Hmmm interesting.

Mike.