Fast 90/90 or ???
04-25-2006, 05:02 PM
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Fast 90/90 or ??? I have a H/C car now with 420 rwhp and want to get to around 450-460 before i put on the nitrous. Would ti be worth it to spend the money on a fast 90/nw90 or keep my ls6/bbk80mm. Im running out of things to do and want to get the most n/a that i can. I had 420 with a 4'' catback now i have true duals. Mods are tsp 231/237, patriot 5.3's, underdrive pulley, lid, ls6, bbk 80mm, long tubes, forged pistons, 85mm maf. What else can i do?
04-25-2006, 05:07 PM
#3
if you want to reach 450 then yea, . . or i would look into the tpis ls6 90, . . they take your ls6 intake and cut off a piece of it and attach a larger opening, its cheaper than buyin a fast intake and others including myself say that the horsepower gain from a fast intake is attributed to its larger opening, . .
04-25-2006, 05:55 PM
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I think ill give tpis a call and talk to them about what i could gain from swapping to that and having them port the intake to match the heads also.
04-25-2006, 08:22 PM
#5
Originally Posted by 02TransAm/Batmobile
if you want to reach 450 then yea, . . or i would look into the tpis ls6 90, . . they take your ls6 intake and cut off a piece of it and attach a larger opening, its cheaper than buyin a fast intake and others including myself say that the horsepower gain from a fast intake is attributed to its larger opening, . .
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04-25-2006, 08:40 PM
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Originally Posted by orangeapeel
Or you can never buy an LS6 and skip straight to a used FAST. 
That was what I did.
That was what I did.
Pay to play!
04-25-2006, 09:50 PM
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A Fast 90/90 setup will not get you there. You will probaly need some better heads and then you might not even need a different intake. Or you could tune it and jet up.
04-25-2006, 10:42 PM
#11
Originally Posted by n2o
A Fast 90/90 setup will not get you there. You will probaly need some better heads and then you might not even need a different intake. Or you could tune it and jet up.
04-26-2006, 10:39 AM
#12
You could throw an electric water pump on there with a fast 90/90 setup and a good tune... That could put you where you want to be. What headers are you using? Long tube headers with merge collectors and the FAST 90/90 and good tune would probably get you there too.
04-26-2006, 01:55 PM
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He probaly does not have the ptv clearance to run a bigger cam. Many of the PP 5.3's have been milled considerably. I am speaking from experience here, my 224/224 .560/.560 was hitting on 4 pistons with pp 5.3's. Now I was spinning the motor to 6600 rpm, but still.
04-26-2006, 02:50 PM
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Good luck. I see those are mustang dyno numbers so they read lower than dynojets anyways. You'll probably need a GOOD set of heads or rework the ones you have. A bigger cam isn't always the answer of course but heads are vital. You will just have to match your setup properly. If you mangae to get the numbers you want you'll be way up there in the H/C dyno list. Do you take your car to the track at all? Those are already good numbers that you have there. What heads and cam are you running now?
04-26-2006, 05:58 PM
#16
Originally Posted by n2o
He probaly does not have the ptv clearance to run a bigger cam. Many of the PP 5.3's have been milled considerably. I am speaking from experience here, my 224/224 .560/.560 was hitting on 4 pistons with pp 5.3's. Now I was spinning the motor to 6600 rpm, but still.
04-28-2006, 10:00 PM
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The pistons do have -2cc valve reliefs and i was thinking of having a custom ground cam put it. i have a tsp 231/237 now. i really dont want to have to pull the heads or spend an extra 2000 for a better set of heads. The biggest reason i want more n/a power is because i know i will lose some when i have to drop the timing for the n20. i will probably do the fast 90/90 since i can sell the ls6 intake. When i had the shop install the 231/237 they checked the p/v clearance and said there was plenty of room. I dont know if i want to swap the cam cuz i have a really nice flat torque curve.
04-28-2006, 10:18 PM
#18
Originally Posted by Jefro6996
The pistons do have -2cc valve reliefs and i was thinking of having a custom ground cam put it. i have a tsp 231/237 now. i really dont want to have to pull the heads or spend an extra 2000 for a better set of heads. The biggest reason i want more n/a power is because i know i will lose some when i have to drop the timing for the n20. i will probably do the fast 90/90 since i can sell the ls6 intake. When i had the shop install the 231/237 they checked the p/v clearance and said there was plenty of room. I dont know if i want to swap the cam cuz i have a really nice flat torque curve.
04-30-2006, 02:02 PM
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I have wanted to get a new cam for a while. But how does my p/v clearnce compare to stock now since i have the p.p. 5.3l heads. Are they milled and did i lose some clearance and did i get any closer to stock with my -2cc valve reliefs? And who do you recommend for a custom ground cam that can get over 450rwhp with the fast 90/90. Also how big of a cam can i go?