guy claiming ~60 chp gain on ls1 with fast 90
02-09-2016, 09:07 AM
#1
guy claiming ~60 chp gain on ls1 with fast 90 A local guy with a stock ls1 that he claims has the same .467/.479 cam as my lq4, but has headers and full exhaust and a fast 92 intake, mail order tune, is claiming the ported fast 92 is to blame. He estimates around 420 chp (ls1 6speed).
His 1/8 mile time is extremely impressive for his mods and it being a 4th gen trans am. He did a 7.3 and said he was only launching around 3500 rpm.
Do you think he actually has a much larger cam and doesn't know it or isn't telling me? My car weighs 3064 lbs and I thought I'de be around a similar 360 hp area as him at first but his 1/8 mile and chp estimate just don't make any sense to me UNLESS a fast 92 truly gives that huge of a gain even with a .467/.479 cam.
I'm way lighter and the threads on here have put a truck intake like mine in a similar boat to fast intakes for power numbers on a stockish motor. I ran a 7.72
His 7.3 1/8 mile puts him at around mid 11s in the 1/4 mile....that sounds way too fast for what he has done. Any thoughts?
His 1/8 mile time is extremely impressive for his mods and it being a 4th gen trans am. He did a 7.3 and said he was only launching around 3500 rpm.
Do you think he actually has a much larger cam and doesn't know it or isn't telling me? My car weighs 3064 lbs and I thought I'de be around a similar 360 hp area as him at first but his 1/8 mile and chp estimate just don't make any sense to me UNLESS a fast 92 truly gives that huge of a gain even with a .467/.479 cam.
I'm way lighter and the threads on here have put a truck intake like mine in a similar boat to fast intakes for power numbers on a stockish motor. I ran a 7.72
His 7.3 1/8 mile puts him at around mid 11s in the 1/4 mile....that sounds way too fast for what he has done. Any thoughts?
Last edited by foxsl; 02-09-2016 at 03:10 PM.
02-09-2016, 10:03 AM
#3
What are the actual cam specs? The lift isn't nearly as important as duration and lsa which will determine valve events. The cam could have the same lift but one could have 2* overlap and the other 12* overlap which will make an insane difference in power.
A truck intake is similar in power to a ls6 car intake...it is not on par with a Fast intake even on a stock engine. An unported Fast would be at least 10rwhp over a ls6 intake on a bone stock engine and will get more with porting or on a cammed engine.
Not sure what elevation you race at but if your car is really that light then your times seem slow to me for a cammed and bolt on 6.0l
My car went over 88mph in the 1/8th at near 3800lbs with a cam/bolt on ls1. 230/224 XE lobed Comp Cam, longtubes, Fast 90mm, and underdrive pulley through a 4l60e with Yank SS3600 and 3.42 12 bolt rear.
A truck intake is similar in power to a ls6 car intake...it is not on par with a Fast intake even on a stock engine. An unported Fast would be at least 10rwhp over a ls6 intake on a bone stock engine and will get more with porting or on a cammed engine.
Not sure what elevation you race at but if your car is really that light then your times seem slow to me for a cammed and bolt on 6.0l
My car went over 88mph in the 1/8th at near 3800lbs with a cam/bolt on ls1. 230/224 XE lobed Comp Cam, longtubes, Fast 90mm, and underdrive pulley through a 4l60e with Yank SS3600 and 3.42 12 bolt rear.
02-09-2016, 10:16 AM
#5
What are the actual cam specs? The lift isn't nearly as important as duration and lsa which will determine valve events. The cam could have the same lift but one could have 2* overlap and the other 12* overlap which will make an insane difference in power.
A truck intake is similar in power to a ls6 car intake...it is not on par with a Fast intake even on a stock engine. An unported Fast would be at least 10rwhp over a ls6 intake on a bone stock engine and will get more with porting or on a cammed engine.
Not sure what elevation you race at but if your car is really that light then your times seem slow to me for a cammed and bolt on 6.0l
My car went over 88mph in the 1/8th at near 3800lbs with a cam/bolt on ls1. 230/224 XE lobed Comp Cam, longtubes, Fast 90mm, and underdrive pulley through a 4l60e with Yank SS3600 and 3.42 12 bolt rear.
A truck intake is similar in power to a ls6 car intake...it is not on par with a Fast intake even on a stock engine. An unported Fast would be at least 10rwhp over a ls6 intake on a bone stock engine and will get more with porting or on a cammed engine.
Not sure what elevation you race at but if your car is really that light then your times seem slow to me for a cammed and bolt on 6.0l
My car went over 88mph in the 1/8th at near 3800lbs with a cam/bolt on ls1. 230/224 XE lobed Comp Cam, longtubes, Fast 90mm, and underdrive pulley through a 4l60e with Yank SS3600 and 3.42 12 bolt rear.
I don't have headers just stock manifolds, catless 2.5inch duals
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02-09-2016, 10:48 AM
#11
ohhh I see
7.3 in the 1/8th with a stock cam ls1 and a 3500rpm launch? Did you see this happen because that doesn't even sound possible. If so has it repeated the run to rule out a glitched timing slip?
running 7.25@94mph 1/8th I went 11.46@116 1/4 on a 1.61 60ft
I say he's heads/cam or spraying.
7.3 in the 1/8th with a stock cam ls1 and a 3500rpm launch? Did you see this happen because that doesn't even sound possible. If so has it repeated the run to rule out a glitched timing slip?
running 7.25@94mph 1/8th I went 11.46@116 1/4 on a 1.61 60ft
I say he's heads/cam or spraying.
02-09-2016, 10:55 AM
#12
ohhh I see
7.3 in the 1/8th with a stock cam ls1 and a 3500rpm launch? Did you see this happen because that doesn't even sound possible. If so has it repeated the run to rule out a glitched timing slip?
running 7.25@94mph 1/8th I went 11.46@116 1/4 on a 1.61 60ft
I say he's heads/cam or spraying.
7.3 in the 1/8th with a stock cam ls1 and a 3500rpm launch? Did you see this happen because that doesn't even sound possible. If so has it repeated the run to rule out a glitched timing slip?
running 7.25@94mph 1/8th I went 11.46@116 1/4 on a 1.61 60ft
I say he's heads/cam or spraying.
Here is all the info he mentioned on his times:
7.36@95 mph in the 1/8th mile
2002 ws6 ls1, stock heads and cam, no spray, DA was 2550, 1.68 60 foot,
1 7/8" headers, x pipe duals, reving to 6400 rpm
He says his secret is "lightweight, especially in clutch and balancer"
Has innovators west pulley and electric water pump.
And sorry it's a "ported fast 92, 85mm descreened truck maf, full 90 mm full intake tract"
02-09-2016, 12:03 PM
#14
ohhh I see
7.3 in the 1/8th with a stock cam ls1 and a 3500rpm launch? Did you see this happen because that doesn't even sound possible. If so has it repeated the run to rule out a glitched timing slip?
running 7.25@94mph 1/8th I went 11.46@116 1/4 on a 1.61 60ft
I say he's heads/cam or spraying.
7.3 in the 1/8th with a stock cam ls1 and a 3500rpm launch? Did you see this happen because that doesn't even sound possible. If so has it repeated the run to rule out a glitched timing slip?
running 7.25@94mph 1/8th I went 11.46@116 1/4 on a 1.61 60ft
I say he's heads/cam or spraying.
02-09-2016, 01:10 PM
#17
TECH Fanatic
Won't see that kind of power from just an intake unless it had an ls1 intake on it and even then that's a stretch. That's a lot of mph in that da for a stock internal setup.
