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ls6 vs fast 90

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Old 11-04-2006, 05:57 PM
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Default ls6 vs fast 90

is the fast intake much of a improvement over the ls6 intake has anyone done any dyno comparisons
Old 11-04-2006, 05:59 PM
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Originally Posted by B18CYA
is the fast intake much of a improvement or the ls6 intake has anyone done any dyno comparisons
if you have a big cam or h/c combo its worth it.. if your just doing bolt ons or a small cam its not worth it.. my opion only though.
Old 11-04-2006, 06:03 PM
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There is a dyno chart in one of the stickies, itll help you out
Old 11-04-2006, 06:12 PM
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Default ls6 vs fast 90

Originally Posted by flyinglow57
if you have a big cam or h/c combo its worth it.. if your just doing bolt ons or a small cam its not worth it.. my opion only though.
I agree. I improved 18 HP and 18 TQ with my modded 346 N/A C5.
Old 11-04-2006, 06:21 PM
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$400 vs $1100 no more power down low but good bit above 5500rpm, IMO for us lil street racers not really worth the extra $$ but for a all out racer ya i see the point.
Old 11-04-2006, 06:24 PM
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thanks guys for info unfortunrtly i will be using a ls6 on top my new stroker looks like i will be giving up some big power
Old 11-04-2006, 07:31 PM
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On a stroker it is a must. My car actually lost a couple RWHP and gained 8 RWTQ when I went to the Fast 90/LS2 TB. My car was much crisper with the LS6 intake on, even after the tune. I plan on building a stroker a little later on so it wasn't like I wasted the money.

J.R>
Old 11-05-2006, 08:34 AM
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i know a few guys who's motors went a little softer with the 90/90. Big cube motors, no question, go 90/90. But a 346 will only respond well if youve got some big mods.
Old 11-05-2006, 09:24 AM
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Moving to the External land of the LS1 motor.
Old 11-05-2006, 10:25 AM
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There is a bolt-on only 346 that gained 2mph when switching from the LS6 and ported tb to a 90/90.

H/C 346's usually gain around 10-15 rwhp over the LS6, and ported 90's will gain another 10 or so rwhp.
Old 11-05-2006, 05:28 PM
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Whats do yall consider a big cubic inch motor? What about a monster 370 with 240-250 cam and stage 3 heads with alot of nitrous?
Old 11-05-2006, 09:39 PM
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Originally Posted by forgedbluess
Whats do yall consider a big cubic inch motor? What about a monster 370 with 240-250 cam and stage 3 heads with alot of nitrous?
Just go LS2 402.
Old 11-05-2006, 10:00 PM
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I already started on the 370 or i would have.
Old 11-05-2006, 11:04 PM
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Yes...almost always a good upgrade. Only time it would not prove as beneficial is when you are not heavily modded (just bolt ons)
Old 11-06-2006, 05:56 AM
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Originally Posted by 1stz06
On a stroker it is a must. My car actually lost a couple RWHP and gained 8 RWTQ when I went to the Fast 90/LS2 TB. My car was much crisper with the LS6 intake on, even after the tune.
J.R>
That's down to the LS2 TB, either swap TB's (NW or PTM) or port the LS2 TB and you should see quite a difference.
Old 11-06-2006, 06:22 AM
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Originally Posted by 300bhp/ton
That's down to the LS2 TB, either swap TB's (NW or PTM) or port the LS2 TB and you should see quite a difference.




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