maxgee

iTrader: (5)

Don't get greedy with boost, don't race everyone who challenges you and be sure to get it tune on the street and not just a dyno tune; unless the dyno can simulate diferrent loads.
You also have options like selling your motor buying a high mile 5.3 for super cheap and put in forged pistons, new bearings etc and have something more reliable under boost than just swapping out bolts.

white01ss

iTrader: (37)

Probably more the later, along with other things. 42lb injectors were maxed out at very close to 100% DC. AFR was still around 11.7:1 but couldn't go any lower. Timing was on the aggressive side for stock compression, E10, and no meth injection at 18 degrees. Bulk of the tuning was done in the nice cool winter with no knock problems whatsoever. Summer brought the heat and the timing wasn't backed off enough for high IATs and it was too late before I noticed. I'm convinced she wouldn't have blown if I had started with 60lbers and a good water injection kit. Live and learn.

Moral of the story... check the tune in the worst weather you will experience and don't push injectors past 80%.

spool'n_gto

I have a 04 gto with a t76 sts turbo kit on it. have not got to the dyno or a good track pass on the new turbo but the old setup was 42# injector and a hp 61 turbo. on the dyno it made 522hp and 630 tq and went 11.2 in the 1/4 at 124. the car has been boosted for 4 years now with no prob with the motor i any way..

S2VYSS

Planning on running around the 10psi mark with a PD blower, doing the odd drag run and I know my tuner is pretty much spot on. Planning on doing bottom end bearings and rod bolts, plus high volume oil pump

mulletnotch

iTrader: (2)

Stock LQ4, Custom Cam, Stock Heads, ARP Head studs and Rod Bolts, Precision 76mm, Through 4L80E:

11.5 LBS = 655 RWHP Pump and Torco Mix

8.5 LBS = 585 RWHP Pump Only

Sees 6800 RPM on the REGULAR

Been together for roughly 6k miles total about 4k of which were at 550 RWHP then the last 2k have been somewhere in the upper 500 range. Motor had approx 60k on it when I installed it and boosted it.

white01ss

iTrader: (37)

Since mine made 540 with a s/c that's more like 610 or so with the drag of the blower. Parasitic loss from the blower must be taken into account when picking injectors. So a turbo motor can make more power from 42's than any belt driven blower setup.

mulletnotch

iTrader: (2)

I would say it's the opposite..... Generally turbo setups require a good bit more injector than supercharged setups. For instance it is very common to run 42lbs injectors on centrifugal setups but I dont know of any turbo cars that'd be willing to gamble on the 42's unless a small motor or minimal boost.

IMHO of course.

Ratical

iTrader: (82)

That's what I have noticed. I've seen stock bottom end cars make 600+ to the rear wheels and last forever and cars making under 500rwhp and blow up! 9 times out of 10 it's detonation related.......

hotrod_tod

2002 ss d1sc 11lb 567hp 28,000 mile still running all stock

danbap

iTrader: (6)

what size pulley you running?

99SS-T

iTrader: (5)

I was making 660 at 12 psi with lq9 heads a small cam and 76gts turbo. It lasted till i got tired of the power and didnt waqnna just try to break it. IE just keep uppin the boost and timing till it popped. Put about 20k miles on it.
And i definately put it through its paces. Alot. Like always. Every stop sign and light. Every onramp. Everycar that i thought had even the smallest chance of takin off.
Now i just gotta get off my *** and finsih it so that i can go faster.

white01ss

iTrader: (37)

IMHO, running 42s on either setup is a big gamble. Conventional wisdom is that entry level supercharged setups only need 42s because they can run leaner than a turbo. I can dispel that myth with both theory and practice. I was hitting 100+% injector duty cycle at 540 rwhp running 42's. Not good.

While it's true turbos like a lower AFR than the a supercharged setup, the total amount of injector required for the supercharged setup is more because of the drag of the supercharger. For example, a turbo and supercharger setup are both making 500 rwhp so that's 588 crank hp with a 15% drivetrain loss. Tossing in some numbers into rceng's injector sizing calculator the turbo setup needs 51 lb injectors with a 0.65 BSFC. Add another 75 hp for supercharger drag and the supercharged injectors have to support 663 hp so it'll need 53 lb injectors even with a lower BSFC of 0.60. So for the same power level the supercharged setup needs about the same size injector if not a little larger than the turbo setup.

JAX04

iTrader: (17)

Well, 14lbs killed my stock ls1 oh well onto the the Forged 370

want1ls1

94 s10 stock 5.3 bw 76mm t4 130xxx miles on motor 25 psi collapsed lifter . Took that out and now have 6.0 with 100ish miles and afr 225's .. Cant wait to see what will be the weak link

Brightman18

wow impressive

mikeyLT1

just askin anyone know how much boost i can push on a stock bottom end of a lt1 email me at michaeltripp1029@yahoo.com

Zero4488

iTrader: (10)

Anyone got a list fastest stock bottom end LQ9?

overhere

iTrader: (2)

ive went 9.8@139 cam only lq9 d1sc at 9psi

Superburban

4x4 Suburban 6400lbs 185,000 miles

Added the Maggie @ 80k miles pushing 6lbs

Ran with a bad tune for awhile

8lbs & a 4L80E around 85000 miles

9-10lbs now, daily work truck and tons of 1/4 passes...just ran Pinks All Out @ 185,000 miles on a never opened bottom end!

mr402

got to luv that boost!!!!!!!!!