Black Sunshine/ 00SS

iTrader: (1)

Big cam, hyd, in the 245-257 range.

I currently run the Fast 90/NW 90, and see 125 MPH (best of 127) in the 1/4 mile, with a raceweight of 3559. On motor.

The car is a street/strip combo, set up for NOS. Just wondering what has been dyno proven for this combo.

Iron block, AFR 225.

Blown04Z06

from what i have read you have the right combo, the only other thing you can do is have the fast ported, not sure if the NW Tb can be ported or even needs it.

Patrick G

iTrader: (14)

Get Tony Mamo to port your FAST, then make sure all your piping to your airbox is 90mm or better. If you're running a MAF, there are a few ponies available by removing it, but at this point, the FAST is the choke point of the system. The more you get it to flow, the more your heads will flow.

Black Sunshine/ 00SS

iTrader: (1)

If it's the choke, then wouldn't a sheet metal intake be better? Or would this not be good on the street?

Blown04Z06

the concern with sheet metal intake is heat soak when driving on the street and sitting at idle. but if you have it ceramic coated that should be able to cut most of the heat soak out of the equasion. port the fast and see if that helps, most ported fast 90's on your set up are seeing 20+hp gains. its worth it. i wouldnt just throw away a $865 intake. lt1dave can port the fast for less and his results are proven. its ported the same day he gets it and he would send it back to you that day as well. he ported my fast 90. i have a LS2 403 + Dart 225's 62cc, im still waiting for my car to be finished, suppose to be done later today.

Patrick G

iTrader: (14)

The sheet metal intake typically has much shorter runners than a FAST intake. This is going to bias the torque and hp peaks to a much higher rpm level. On the bonus side, the sheet metal intake won't lop off the flow of your excellent heads the way a FAST intake will, so this will help you make more power. If it's a racecar, the sheet metal intake is the way to go...but keep in mind, LS1 Joe's sheet metal intake for example, wasn't better than his FAST until 6500 rpm. For a street/strip car, a long runner sheet metal intake is the ultimate. The Harrop IR intake is a good example of giving you the best of both worlds.

98redorangeta

iTrader: (10)

I havnet seen the dyno results but what about carb style intakes arent they doing pretty good?

Louie83

iTrader: (3)

So I take you are saying the Harrop makes just as good low rpm numbers as the Fast? What accounts for this difference in the Harrop compared to other sheet metal intakes?

Blown04Z06

im wondering the same question, im thinking about going this way in the future with higher flowing heads.

Patrick G

iTrader: (14)

That Harrop is better down low and up high compared to the FAST. It spanks it everywhere. The reason why? Very high flowing high velocity runners, long length to promote strong mid-range power, individual throttle body per cylinder. Why are there so few out there in the US? For around $3500-4000, most people would go forced induction instead. But for the ultimate in street/strip, the Harrop is tops in my opinion.

JimMueller

iTrader: (9)

Just out of curiosity, will the Harrop properly mount to the newer intake ports, i.e., L92, LS7, etc?

Judd

iTrader: (1)

Did 540 RWHP and nearly 500ftlbs of torque. 402 with ported 225 AFRs with a bit bigger cam {256/264}. Ported LSX and NW 90mm TB.

Black Sunshine/ 00SS

iTrader: (1)

I'm guessing this was with a 6 speed car? Not really a fair comparison. But out of curiosity, what do you trap in the 1/4? I thought 127 was great in a 3559 lb car.

If porting the intake gets such great gains, then the intake is a big bottle neck to the heads. How about the Wilson intake? I dont have a problem sticking with what I have, if it is the best I can do, but it looks like not to many guys are experimenting with different options to see what is best.

Judd

iTrader: (1)

Yes it was a 6 speed. Wasn't really trying to make a comparison to an automatic just giving my results. Have not ran the car yet {probably won't untill spring} but my old set-up {cam only 346 with 400HP} trapped as high as 118.5mph.

TUF383

We make a transition spacer for both LS7 & L76/L92 heads.
It is not ideal, but the cost of tooling another design from scratch is prohibitive.