I see that Summit now has them available for delivery. Claim 30HP on a LS6... Thoughts ??? $650 +/-

 

No way. A ported FAST on a H/C car usually doesn't give that much of a bump over stock, and these things die after 6,000 RPMs where you would tend to see an advantage on intakes. If you want more for less then port your stock LS6 TB and intake manifold and be happy

 

Umm on a seperate note I wonder what the weight differance is on a "Nylon 6" composite vs stock... Anyway in the new Summit Jan/Feb catalog it says 32HP and 31ft/tq over a factory with a 90mm TB...

 

probably tested on a 600+hp race motor just so they could make those claims Through years of field observation and testing I've found manufacturer marketing hype seldom pans out in reality.

 

umm.... than explain the pick up of about 20 wheel horsepower a least over ls6 inake on almost every car here with a fast on it

 

Because most people go from a stock LS6 intake and throttle body to a professionally ported FAST setup. This is an apples to oranges comparison. I had a pro ported LS6 intake and throttle body and then went to a pro ported FAST setup and only gained 5hp in a very narrow peak hp range, but lost average under the curve TQ and HP. So the ported LS6 setup was better for my application than the ported FAST.

Hype has driven the sales of the FAST more than anything, it is unneccesary for many applications and only really shines in the most extreemly built 346ci engine. Tuners, and vendors like the FAST b/c it is easier to port and is something else to sell and make a profit on. Back in 02 LG was making 470rwhp with just thier G5X2 cam through a ported LS6 manifold and Throttle body. At that time they stated the ported LS6 setup was more than adequate at this power level. Now that the FAST has emerged they are promoting it. I wonder why? ($$$)

I have also seen some independent tests done on pre-release Street Warrior manifolds that showed the manifold loosing effectiveness after 6000 rpms. But maybe this is why the release has been delayed for so long; perhaps they went back to the drawing board and came up with a more effective design. Only time will tell. But I wouldn't go out and buy one just based on what the manufacturer claims.

Does that satisfy your hit and run question?

 

A well ported LS6 combo will work better on a street 346ci motor than the FAST 90 b/c intake velocities will be higher through the LS6 which will result in better cylinder filling in the mid RPMs. Once you go beyond 450rwhp the ported LS6 setup will begin to restrict max power b/c you need the larger volume of air to better fill the cylinders in the higher RPMs. So above those power levels it would be a no brainer on a track car to go with a 90 setup, but will still be a tradeoff on a H/C street car with a 346ci.

 

Great thread. I had been pondering porting my LS6 set up or buying the Street Warrior. Sounds like porting the LS6 makes more sense.

 

I was wondering what is involved when porting and found this article to be interesting. I would have thought the composite manifold would be a "cleaner" (less over-mold etc.) piece than a sand casting but I guess it's not?

http://www.highperformancepontiac.co...ing/index.html

http://www.sa-motorsports.com/diyport.aspx

 

What a funny world as a supplier of "porting" plenums and throttleb s just called me said "not worth the time to port LS6 plenum and throttle body porting will increase responsiveness but NO HP " !!! word for word !!!



Joe

 

My Cousin calls that "localized fatalizm". I found a similar stament while surfing for porting info.

"Note: we do not port LS1 or LS6 manifolds as there are no measuarble gains associated with these manifolds."

Scroll past the dyno sheets...

http://forum.grrrr8.net/showthread.php?p=27961

 

Lies I tell you, Lies

Call or email Lingenfelter customer service, they are not hurting for business and will tell you the truth about what is to be gained on porting the LS6 gear vs a 90mm setup on a 346ci engine. Just porting the throttle body on a stock LS6 is only good for about 2-3 hp. But once you add headers the advantage goes to a gain around 7hp. The increase becomes even more (15+) when you do cam and heads and match port the intake manifold to the TB and heads.

Before I went to the ported FAST setup I contacted Lingenfelter; they told me I'd be wasting my money (because I already had a ported LS6throttle body and match ported my intake to my TB and heads)unlike a couple other tuners. Lingenfelter was correct I wasted a bunch of money going to a ported FAST setup over the Ported LS6.


If you go to a larger engine such as 383ci the demand for the 90 mm opening becomes neccessary to maximize the engine's potential.

 

Sounds like "Ricer math" to me. I didn't do a before and after dyno between my H/C install, and later addition of FAST, but, after installing the 90/90, my clutch went away. It worked fine for a couple of months after my H/C install, so, not scientific proof, just anectodal.

 

Because Lingenfelter is king of rice?

Common sense would tell you not. There wouldn't have been much gain for your ported FAST when your motor was bone stock... agreed? Now when you add headers, good heads, bigger cam the needed airflow to produce the extra power changes dramatically, so when you slap the ported FAST on your previously air starved setup it is going to make a big difference. Similar result would be experienced when going from stock TB and manifold on a modified engine to a Ported LS6 TB and match ported manifold. Ultimately the FAST is going to produce bigger peak numbers the more aggressive one gets with the build; no argument there, even with my mild cam my peak numbers were higher with the FAST but my below peak numbers were lower