: Lost boost, Maintained power. Need new setup



hemi2LS
08-22-11, 08:19 PM
Got a call from my local installer saying he had some headers in. I get the headers and added Mayhem II cam in the mix.
I went from 13lbs of boost to 10lbs, and maintained my power of 630whp and then 570lbs now 579lbs. Dynoed and the heat was at 112 degrees were previous it was at 77 degrees, car feels alot stronger then before and sounds alot nastier.

Question would I benefit more from a 9.5 lower and 2.5 upper setup and gain that boost back plus pick up a few more hp. Or would a 9.1 and 2.5 be better (not sure if im right but isn't this setup pretty much equal to my current 10" pulley?)

open for suggestions

Current MODS 10lbs boost
Mayhem II Cam
Kooks Headers
3" exhaust
New Era Cai
Ported TB/Snout/Blower
650 lift springs
10" pulley
Modified LS9 Injectors

Previous Mods 13lbs boost
Cat Delet pipies
GT9 cam
3" exhaust
New Era Cai
Ported TB/Snout/Blower
650 lift springs
10" pulley
Modified LS9 Injectors

Razorecko
08-23-11, 08:32 AM
Are you still on your stock block or is it built ? I'd do the 9.1 lower 2.5 upper

Cub Cadet
08-23-11, 08:37 AM
What about swapping in a different, more efficient blower?

hemi2LS
08-23-11, 09:04 AM
still on the stock block.
will the 9.1-2.5 setup be spinning the blower past it's effencieny?

Razorecko
08-23-11, 09:12 AM
still on the stock block.
will the 9.1-2.5 setup be spinning the blower past it's effencieny?

You would def be pushing it. I'm a little suprised that with that 10" you're only pushing 10lbs. I've got the whole h/c ported/headers combo and i'm pushing 11.5 on a 9.1" only.

cbloveday
08-23-11, 10:00 AM
I lost power when I tried the 9 or 10 lower with the 2.55 upper. I had to go back to the 8.6, oddly enough

hemi2LS
08-23-11, 10:30 AM
You would def be pushing it. I'm a little suprised that with that 10" you're only pushing 10lbs. I've got the whole h/c ported/headers combo and i'm pushing 11.5 on a 9.1" only.

Maybe the 3" exhaust is helping with that 1psi difference. I'm at 10.7 now. I may give it a try. what are you pushing with your 9.1 setup..

cbloveday- how much did you loose on the switch from 9-10 with 2.5 upper?

Razorecko
08-23-11, 11:08 AM
Maybe the 3" exhaust is helping with that 1psi difference. I'm at 10.7 now. I may give it a try. what are you pushing with your 9.1 setup..

cbloveday- how much did you loose on the switch from 9-10 with 2.5 upper?

I pushed 654rwhp corrected on Jesse's dyno. That was 11.5 a/f and very conservative timing

cbloveday
08-23-11, 11:22 AM
I got dyno somewhere but I wann say @ least 50rwhp. Again, that was me. I tried several times to go to a bigger lower witht he LSA and LSX.
Maybe it is just due to my application.

hemi2LS
08-23-11, 02:11 PM
I figure I'm loosing a bit of hp due to 112 Dallas temp during the dyno. If I could just make up for the boost I did loose I'll be set. what will that setup pick up in boost?