That power drop off is not bad at all, have you seen small turbo car's? My brothers speed6 will drop over 5 pounds of boost from 5500 to 6500rpm's. lol

i believe it, but it made max power at 6800 rpm. stock cam 2.8" pulley cars do that. unfortunately, all of the efficiency and flow charts provide data to a blower speed of 14 k rpm. without real world testing, we cant know how the blower flows at 18 k rpm that hes spinning to.

youre right though, its not that bad

Nah, the gmpp manifold has nothing to do with me not dropping boost. That little ported manifold flows just fine. Take a look at my flat torque curve in my dyno thread.

Like spawne said.... its the H62 that helps me out.

I still think he's a tad bit down on boost from where he should be, however. Someone had made a good point about the added efficiency of the cams, which would completely makes sense and is likely the culprit here. Stupid little m62.. lol

Yep. I saw 1 psi drop with my cams.

My car did the exact same thing with my zzp s2 cams, and they did in infra's car also. It's what was said earlier: their most efficient point is at high rpm, letting more air in and out.

Right. Which is why I said I agreed with it and made complete sense once it was mentioned. :)

Great news! But will one of your ported blower be able to help me flow more cfms at the 7-8k RPM range? right now it seems my higher redline is not utilized as well as id like. already have heard good things about the ported blower from 09cobalt.

Amclure or something does them here.

Don't you do the ported blower casings? Or does MrBelvedere?

A ported m62 definitely isn't going to give big numbers by any means, but CobaltSS 16's setup yielded some good results with it, although I'm not sure who did his blower porting. Hopefully we can get back on the dyno soon to compare against his previous setup. We WERE supposed to do that this past Saturday, but of course, it snowed Friday into Saturday here so that got the big ol' fat axe.

^ Yeah Alex over at Granite State Dyno who did my pulls was bitching at me cause I didnt call before coming over on Saturday.
Alex: 'Well looks like we wont be able to do it today' he's looking at the car through the shop window... 5 mins later 'Well I guess since you drove all the way up here' as hes's pulling the car in... 5min later. 'You need to call me first so im not risking my equipment with a dyno pull' as he's strapping my car down! LOL

In my defense tried to get as much snow from the fender wells i could. haha

I know too bad.

Alan (armcclure) ported my blower. I picked up 1-1.5 psi on my E85 2.7" setup in the upper RPM range until where I shift at ~7K rpm (i think my rev limiter is at 7.2k though.) Blower sounds money too lol

Definitely think it would be beneficial on Shanmans setup.

Quick tip: watch maf lb/min or freq instead of boost when judging airflow.


There's blower info here: arm-performance.com

Well i requested to be a groupie :twothumbs

Way ahead of you arm. ;)

I know I'm not as well known in the lsj area but cobalts aren't my first rodeo. :)

Good job on the blower btw.

This.