Any side by side LS2 vs LSX dyno comparisons yet?
10-01-2004, 06:00 PM
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Any side by side LS2 vs LSX dyno comparisons yet? Has anyone taken the same block and done a side by side comparison yet? Preferably with the FAST TB. I'd like to know how much you're gaining b/c of the intake alone. Whats the difference in gains? Anyone?
10-05-2004, 03:52 PM
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I want an LSX 90mm intake manifold using the 90mm FAST TB dyno tested on a chassis dyno, and then swapped out on the SAME MOTOR for an LS2 intake(I understand the mods needed to do this) also using the 90mm FAST TB. I wish they had a 78mm LS2 design, I'd like to know how much the LS2 is gaining soley by the 90mm TB.
10-07-2004, 12:11 PM
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Would be real nice to see.
Hopefully someone does this soon.
I am willing to bet the difference is almost 0.
From the flow numbers I have seen on a stock LS2 headed and camed car the LS6 LS2 Fast 78 and Fast 90 will probally all be very close in HP because the car is stock.
Once you add heads cam and especially cubic inches you will start to see a difference.
Based on the flow numbers it looks like the fast has GM's *** on this one.
Hopefully someone does this soon.
I am willing to bet the difference is almost 0.
From the flow numbers I have seen on a stock LS2 headed and camed car the LS6 LS2 Fast 78 and Fast 90 will probally all be very close in HP because the car is stock.
Once you add heads cam and especially cubic inches you will start to see a difference.
Based on the flow numbers it looks like the fast has GM's *** on this one.
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10-07-2004, 05:54 PM
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Well, I guess the question I'm begging is whether the gains found by the FAST are attributable both to 90mm intake opening as well as improved flow designs within the intake itself; also whether the LS2's gains are purely due to the 90mm intake opening. Has anyone torn the LS2 apart to see how reworked it is over the LS6?
10-09-2004, 10:55 PM
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Originally Posted by Beast96Z
From what I've read on this board, a reputable suporting vendor flow'd the LS6 intake against the LS-2 and the 2 show'd no diffrence. This would lead me to believe the LSX would still be better and all gains seen were from the throttle body.
10-11-2004, 10:22 PM
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For a stock car, nothing. The LS-6 is plenty. If a cheap kit surfaces to adapt an LS-2 with ease, maybe go for that if anything. FAST intakes on stock cars have shown close to no gain. It wouldn't be worth the dough...
10-11-2004, 10:58 PM
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Originally Posted by ataylors
Just for the record, as this becomes blurry on this board, can you define stock. Some people concider heads and cams bolt-ons
10-11-2004, 11:22 PM
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Bolt-ons stop at the intake inlet, and the exiting exhaust ports of the heads. The throttle body and headers are basically as far in as you'd go to be considered a 'bolt-on' only car.
10-11-2004, 11:32 PM
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When I said stock = stock internals, I meant it only for his definition in reference to the lsx intake conversation. NoseUp's explanation above is the perfect definition for what Bolt-on modifications are.
