FAST LS Intake
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From: Miami, Fl. - Hurricane Highway
Depending on what mods you have they are worth it. If your just bolt ons or maybe bolt ons with a cam just get yourself an LS6. But if you got bolt ons, cam, and heads you can really benefit from a Fast 90. Even though trans am1 gained only 5hp, i bet his power under the curve looks alot better than what it did prior to the 90mm intake set-up. And thats all that matters not how much power you make, but the area you make your power and how you use it.
-Joel
-Joel
Originally Posted by 2000Hawk
Depending on what mods you have they are worth it. If your just bolt ons or maybe bolt ons with a cam just get yourself an LS6. But if you got bolt ons, cam, and heads you can really benefit from a Fast 90. Even though trans am1 gained only 5hp, i bet his power under the curve looks alot better than what it did prior to the 90mm intake set-up. And thats all that matters not how much power you make, but the area you make your power and how you use it.
-Joel
-Joel
This is from a post in an old thread about porting a Fast78 out to an 85mm. It's from Tony Mamo and it is the best post that I have seen regaurding the diferent manifolds.
There is not as much difference between a 78 and a 90 as most think...
Hope you don't mind me quoteing you Tony...
Consider this in your search for "value" (I look at everything on a HP per dollar basis).
If you already have a good epoxied and ported 78 mm TB (like a Mark Shaner piece or something similar) score a 78 unit cheap and just consider having it ported. Even at the prices I charge to do a very neat and thorough job your return on investment is still better than buying a larger 85 mm TB and cutting up the snout which might close the gap in half between the 78 and the 90 netting you 2-3 HP. For an extra few hundred you would see an additional gain of 10 RWHP and a similar bump in TQ (my ported FAST 78 set-up went 20 RWHP and 15 RWTQ stronger than my former LS6/78 set-up as I previously mentioned).
For grins I just whipped up this spreadsheet....prices and performance may vary slightly but I think the general point I am making would still be intact.
Manifold.............Avg Retail $$...........Typical Gain.........Cost/HP
Stk FAST 78.............700........................8....... ............. $87
Stk FAST 90 (w/ TB)..1200......................13................. ...$92
FAST 78 w/ 85 mm.....900.......................11............... .....$82
Ported FAST 78.........1200......................18........... .........$67
Ported FAST 90/90.....1700......................23............... .....$74
The key is to understand that the snout doesn't represent the largest restriction in the FAST hence the smaller gains when messing with it. Reshaping and reconfiguring the ports are where the larger gains in airflow and power can be unlocked....
Tony
There is not as much difference between a 78 and a 90 as most think...
Hope you don't mind me quoteing you Tony...
Consider this in your search for "value" (I look at everything on a HP per dollar basis).
If you already have a good epoxied and ported 78 mm TB (like a Mark Shaner piece or something similar) score a 78 unit cheap and just consider having it ported. Even at the prices I charge to do a very neat and thorough job your return on investment is still better than buying a larger 85 mm TB and cutting up the snout which might close the gap in half between the 78 and the 90 netting you 2-3 HP. For an extra few hundred you would see an additional gain of 10 RWHP and a similar bump in TQ (my ported FAST 78 set-up went 20 RWHP and 15 RWTQ stronger than my former LS6/78 set-up as I previously mentioned).
For grins I just whipped up this spreadsheet....prices and performance may vary slightly but I think the general point I am making would still be intact.
Manifold.............Avg Retail $$...........Typical Gain.........Cost/HP
Stk FAST 78.............700........................8....... ............. $87
Stk FAST 90 (w/ TB)..1200......................13................. ...$92
FAST 78 w/ 85 mm.....900.......................11............... .....$82
Ported FAST 78.........1200......................18........... .........$67
Ported FAST 90/90.....1700......................23............... .....$74
The key is to understand that the snout doesn't represent the largest restriction in the FAST hence the smaller gains when messing with it. Reshaping and reconfiguring the ports are where the larger gains in airflow and power can be unlocked....
Tony
