Witt

Jamming up 24psi worth of manifold pressure on these cars yields unbelievable parasitic loss no matter what blower you use.

<20psi + spray or turbo swap is where its at.

shabodah

I wouldn't generalize that to include engines with exhaust ported heads.

silentd

iTrader: (1)

get the TTR engine mount and the TTR poly bushings for the tranny. it does nto vibrate bad at all, and does not vibrate when driving, only at idle and very little.

this isnt a cavalier.... these car was designed to go taht fast.

my car felt more sturdy with them in, and the engine wasnt sloushing around. trust me they are the best thing to buy

Witt

I think the bigger issue is the reversion of the intake charge against the blower. At a point you exhibit huge losses due to this regardless of rotor size, compressor thermal efficiency or engine volumetric efficiency.

WSFrazier

Lol, there are a couple already.

Altiery54

ha i knew it. any info floating around on some #'s anywhere

shabodah

I don't disagree with you, I'm just stating, no matter how much air you try and force in there, if it can't get out, you've got problems.

Witt

Oh definetly. There were some flow benched numbers on the LSJ head floating around here or in my email inbox. The part I remember is that the cam will be your biggest restriction until .45" lift. Thats not saying that exhaust porting won't decrease EGTs though.

Area47

over .400 lift on the cam side, cool things start to happen with the stock lsj head

no nearly as cool as a ported head with cams.

Zooomer

iTrader: (1)

Don't put words in my mouth, I never said that.

Witt

^^Bryan has the most objective dyno results on cam changes with stock, 272 regrinds and GMR cams. The rest of us (that I know of) have modified other aspects too greatly (static CR or compressor change) to get objective results on top end modifications with stock sized exhaust ports.

Blown 4-banger

Stock head

Intake = 267 CFM
Exhaust = 161 CFM

ls1fbody

^ that sucks.

Rodimus_Prime

iTrader: (3)

actually im only seeing 20psi right before i run out of gear at 7000, thats prob due to the exhaust setup i have

Area47

don't assume i don't understand basic science.

when im singled out for stupid ****, then i get defensive. hence WHY i said that.


tonight kiddies, i'll drop by the dyno shop and get a comparison of the 272's vs gmr cams and make a new thread

Witt

Something like 170 with an aftermarket cam and 145 on stock cam are the numbers I had. Puts it around 350whp on a stock cam and 400whp on an aftermarket cam.

Area47

if i had access to my gmail stuff, i could get the exact numbers. stock cams can be pushed to over 400, but not much more than that.

BlackSS/SC

I've been talking with Dave @ flowtech, he has offered me a really good price on porting, ferrea springs, seats, retainers, spacers, washers for under the lifters will be epoxied on and grinding my cams to 272 specs. He said his port job is 3% gain on intake and 10% on the exhaust.

So cam guys..... Is this a good gain on the porting? Or should I be looking for more porting?

Area47

epoxy eh?

well thats festive

intake side is peachy for a long while. longer than the stock sleeves and pistons can hold. do the exhaust side. or just do what i do and overkill it

BlackSS/SC

Yeah, Dave said he has industrial epoxy that will keep them in place forever. I just hope that is true.

I'm doing pistons too and have been told the stock sleeves and rods are good for a long while. I've heard they were pushed past 600hp, but how reliable would that be?

o3nisoaso3

oooo cant wait... im trying to get back to the dyno for my comp cam upgrade but curious to see how a boosted vs n/a gain differently. never really looked into it before. im bout to slap the garrett kit on my car and get trifecta to tune it with my current mods n see if i can hit 300-325whp (maybe get a gt30 turbo tho)

Psykostevo

Shh.......don't wake the baby!

Hey buddy, when you letting me come over and diddle with your ecotec?

Blown 4-banger

Sorry mang, I'm the only one who will be tuning my car. I've done everything else myself, and I more than know how to tune my car. If you wanna come over and watch, thats cool. For tuning though, definitely gonna be self tuned. I've tuned a bunch of other cars in the year since I blew mine. I'm excited! It will be quite a challenge gettin this thing to idle

an0malous

Area47

sleeves are fine to big numbers. the rods will give before those do