bboyferal

iTrader: (9)

I'm planning my forged set-up that will take place in about a year... Some trivia to account for some issues I don't have the answers to:

1. What would the consensus be on the highest (but safe) boost/power to run on a turbocharged LS1 with forged internals at ~346/347 cubic inches with a very low CR (Stock cam/Z06/light cam, Stock heads/6.0's, Stock intake) on 93 octane (no meth? Let's try without it... )? Give me a ballpark rwhp number and a psi estimate...

2. Sticking with this displacement criterion, what would be the turbo to hit the numbers that answer question 1 nicely? Nicely meaning MAYBE a little drop at the end, but QUICK spool. Whatever number we ended up with from question 1, I'm pretty sure a 76GTS turbo can hit it. BUT... can something smaller hit it as well?

I'm just thinking... Wheels are turning, you know... I know a bigger displacement is better for higher pump gas numbers... I know... But I was just wondering...

Pro Stock John

iTrader: (34)

A very peaky 800rwhp.

DrTurbo

iTrader: (3)

The 76GTS will work fine. As for peaky, when has 346 cubic inches ever been peaky? Try driving a 2JZ supra, then mention peaky...hehe

nitrorocket

iTrader: (12)

Look mine up. Pretty simple yet effective setup. You can make roughly 800 rwhp on pump. Between 15-17 psi depending on combo.

MIGHTYMOUSE

iTrader: (59)

i made 636 on 11psi, but that is on daily driver beat on it every day no popping headgaskets at the track mode.. not 1 4th gear pull on the dyno mode.

Frost

iTrader: (45)

Wow, that's within 2 HP of Jarrod's numbers @ 11 psi.... I'm sure you realized that but I didn't. What was the rest of your setup then? N/M Imma call ya

MIGHTYMOUSE

iTrader: (59)

Jarrod made 638 but on stock compression and methanol

what i made was on 8.7:1 and no methanol

bboyferal

iTrader: (9)

EXACTLY the info I wanted, MM.

Cool... what turbo?

MIGHTYMOUSE

iTrader: (59)

that was an inovative gt80-r and on a 346" aluminum motor way back then.

the 80 is probably not the most efficient choice at that psi on 346.. i imagine you could pick up a little on a 76mm. if that is the range you want to keep the car in for its life.

bboyferal

iTrader: (9)

not efficient... you mean the 80 was too much turbo? Like... big sucker to spool up compared to the 76 that will achieve the same #'s?

These are the things I'm considering. Also, is there a turbo to hit those numbers smaller than a 76? Probably not, huh, without HUGE drop-off's toward the end and/or heat issues... ???

Smearin

You also have to consider A/R and Flange.. They dictate the spool time also.

30th t/a

iTrader: (51)

i was wondering the same with my setup. i see most people are hittin the around the 600rwhp mark with a 100% stock engine with race gas and roughly 12-13psi.
now my engine is all stock except for the bottom end and i have 8:75.1 comp. will i be able to make 600rwhp on straight 93 (no meth) and at what psi? im thinking 14ish since the stock motors have 10:1 compression.

Smearin

Everyone has been saying that its all about the tune.. whether your stock components will last or not..

What size turbo's are you running? you shouldnt have a problem hitting your mark with 12-13 psi..

peter pan

I have a A&A forged 346 with West Coast 72 cc heads comp cam 224 581/581 on 115 LSA with an A&A DS1C setup pushing 14 lbs of boost with 16 degrees of timing with Alky and I am well over 700 rwhp

Slowhawk

iTrader: (12)

We've run 700rwhp all day on pump gas/Turbo setup.That is near the edge for a DD but it lasted. Keep in mind you can not compare a ATI setup to a Turbo on power output since the Turbo could make 200hp/200tq more than the ATI in the midrange area which stresses the motor more

I'd be happy with 600-650rwhp/same torque on a DD turbo car

MIGHTYMOUSE

iTrader: (59)

700 on a 346?

Pro Stock John

iTrader: (34)

I'd love to see some of these 700rwhp cars trap over 140mph.

Slowhawk

iTrader: (12)

Yes,not hard to do on a 6 speed car.Since they were street cars and prone to spin the tires the load probly isn't there to hurt the motors.

We do have 1 346/F1 car that pushes 740rwhp on pump gas/np meth and hooks good on the street with the ET streets he always runs. Of course the engine is on the edge for pump gas but it's holding so far (6month's) Just tune the car conservative with 11-1 A/F and run some good boost/conservative timing

Slowhawk

iTrader: (12)

So would I. The sad part is that 90% of my customer's are street guy's and never go to the track They do nice 80-100mph burnout's though We need more tracks up here

30th t/a

iTrader: (51)

my bottom end is forged 8.75:1. turbos are twin t44's.