LSX & 90mm TB results
LSX & 90mm TB results Before: 407 RWHP, 398 RWTQ
After: 420 RWHP, 400 RWTQ
Decent gain, considering the fact my heads suck (JPR S2). I would expect a gain of 20-25 RWHP could be expected with good flowing heads.
The gains were entirely between 5500-6500 RPMs, but the intake lost nothing down low.
Tuning is a must to maximize the LSX, the first dyno pull prior to tuning showed ZERO GAIN. The LSX leaned out the A/F ratio, so Jeff had to richen it up and pull timing to find max power. Best power was made with 27 degrees of timing, with the LS6 intake I made best power with 30 degrees.
After: 420 RWHP, 400 RWTQ
Decent gain, considering the fact my heads suck (JPR S2). I would expect a gain of 20-25 RWHP could be expected with good flowing heads.
The gains were entirely between 5500-6500 RPMs, but the intake lost nothing down low.
Tuning is a must to maximize the LSX, the first dyno pull prior to tuning showed ZERO GAIN. The LSX leaned out the A/F ratio, so Jeff had to richen it up and pull timing to find max power. Best power was made with 27 degrees of timing, with the LS6 intake I made best power with 30 degrees.
Good deal, thanks for sharing! 
The 90mm seems like the way to go. You can use it if you go bigger, and wth H/C you will still see some gains, and lose nothing down low.
Agains, thanks for the info.
Rob
The 90mm seems like the way to go. You can use it if you go bigger, and wth H/C you will still see some gains, and lose nothing down low.
Agains, thanks for the info.
Rob
SMITH- You going to Roxboro tommorow night? Get your tranny back yet? Call me or drop me a PM.
13 HP for ~$1300 is not a great HP per dollar ratio, IMO. Probably that money would be better spent on a good pair of ported heads...but if you already have heads and cam, its a worthwhile mod for those looking for every last HP.
And JPR heads have proven not to be the best ported LS1 heads on the market
, so I really think better heads will benefit more from the extra air.
13 HP for ~$1300 is not a great HP per dollar ratio, IMO. Probably that money would be better spent on a good pair of ported heads...but if you already have heads and cam, its a worthwhile mod for those looking for every last HP.
And JPR heads have proven not to be the best ported LS1 heads on the market
, so I really think better heads will benefit more from the extra air. Trending Topics
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Originally Posted by xxxhp
Congrats. What was the power difference between 27 deg timing & 30 deg timing?
About 7 HP. The other 6 HP came from getting the A/F ratio dialed in.
Originally Posted by BADSS
About 7 HP. The other 6 HP came from getting the A/F ratio dialed in.
Originally Posted by gojo
Nice results. It's a good mod for power that doesn't hurt driveability. IMO it's a good value.
I agree. And better heads and/or more cubes will benefit more. I also want to point out that I did no porting or port matching with the intake, so there may be more gains to be found there.
Drivability is actually improved...throttle response is crisper; I guess due to the larger TB. For example, 5% throttle opening of a 90mm TB is gonna let in a lot more air than 5% throttle on a 75mm TB.
