Mike 01WS6

They don't make even close to 1,400hp. 800 at best.

If you had a half million dollar motor I'm sure you'd make huge power with virtually no displacement as well. There's so many differences on an F1 motor compared to your LS1 that it's a total orange, compared to your apple.

For instance, the valves are neumatically actuated and the tank must be refilled throughout the race or they wont open and close properly. Try taking a cruise with some buddies and then run outta air.

BigBronco

iTrader: (2)

About time Tiago!

More cubes will ALWAYS help out.

By the way, F1 motors are 2.5L That is 150 Cubic Inches.

SSilverSSurfer

iTrader: (8)

yeah and they spin rpms like bikes...those things are ridiculous, i went to grand prix houston and it was awesome

Tiago

iTrader: (27)

sleeve on the block will let go sooner or later... my heads never lifted after all, I had a cracked sleeve...

DrTurbo

iTrader: (3)

I think he was talking about the early 90's and late 80's. They were only 1.5L engines and were making 1400-1500hp in qualifying trim

cablebandit

iTrader: (37)

More power in my mind is not just a peak number but overall power at every rpm point. If bigger didnt make more power why even turbo.....it simulates a bigger motor by making more oxygen available. I am not talking street car or anything else........given an unlimited budget, which will make more overall power...350 or 400ci? 400ci Unfortunately, we dont have unlimited budgets

Rickys S/C Z28

iTrader: (13)

wow i just read all 5 pages and what iv come up with is....... well im not sure?? but seeing as all of you have done this and im on my first FI build illl ask this, if you aready had a 2000 z28 with a P!SC on it and you had about 8k to spend after you got back from iraq and you want to make the most fun DD you could, and still go a 10.xx what would you do??? 408 or 346?? remember $8000 and the most FUN DD??? most fun to drive!!!(ok ill go run and hide but great stuff on here yall make it very fun for a guy like me)

bboyferal

iTrader: (9)

Correct, but the sleeve going had nothing to do with size... It wasn't a deficiency brought about by increasing cid, right?

98Z28MASS

iTrader: (6)

Id say forged 346/347, sell your stock short block, pick up some patriot 6.0 heads, and then spend the rest on a 9 inch rear or 12 bolt and a built tranny to hold the power (or a clutch to hold the power)

TS6

iTrader: (41)

If you're gonna keep that P1SC then you will want to stay with the 346. Not that it'll run bad with a 408, but the extra weight won't be offset by using a bigger blower.

Tiago

iTrader: (27)

no. But I would say that whatever I was at was the limit of my perticular 346 it felt extra peppy the last days of its life.

DrTurbo

iTrader: (3)

That will all depend on the turbo you choose. With a 76GTS the 350 will eat up the 400. 400ci on pump gas will make more power, but take them to the strip and run them wide open with race fuel and the 350 will make more power. Ask the NMRA DR guys......88mm cars with 360 max and some of them are moving down in cubes now, Why?? More power...

cablebandit

iTrader: (37)

did you miss unlimited budget? If i had money, i wouldnt use a 76gts for max power on a 400. I guess with your logic we should all dump the 347/408 and run a 1.5L and make more power. That is what you keep repeating.....smaller makes more power. Quit handicapping the bigger motor....

bboyferal

iTrader: (9)

Well, if I've been reading this thread right (NOT MY PERSONAL OPINION), it seems its better to handicap the motor than the turbo, viz.

1. You don't lose turbo reliability going to a bigger turbo.

2. You do lose ENGINE reliability the bigger you stretch the LS1 engine, according to some users on this thread (bigger bore increasing the risk of detonation and cylinder distortion).

Is this where we're at? Is this one of the current questions or am I reading this incorrectly?

2001WS6Vert

I think Vince just like to start threads that he knows will start fireworks.

engineermike

I guess we can say this a different way. A bigger motor will only make more power than a small one if it has an appropriately sized (larger) turbo. However, since we drive F-body's, then most of us are limited to a small turbo, so smaller cubes will make more power on race gas and high boost.

Take the 76GTS example again. 383-402 cid seems to be stuck at 750 - 800 rwhp (20 psi max'd out). 355 have done as good as 990 rwhp (24 psi max'd out). 180 cid Supra's have gone over 1000 rwhp (28-35 psi). All with the same turbo. Now, if we flip things around and put a pump gas constraint on it and limit boost to, say, 17 psi, the 388-402 will be at 700 rwhp, the 355 will be at 650 rwhp, and the 180 cid Supra will be at 550 rwhp.

Mike

TNTramair

iTrader: (15)

so far what ive gotten out of this thread is that if said person had the means (money) to do so, they would go with bigger cubes. im no engineer but in essence it would seem that a bigger cubed motor would make the same amount of power as a 346 with alot less boost.
case in point earlier in the thread SVC making 700+ on only 9psi with his 408. i know combos would vary and would determine the HP in the long run but the most ive seen out of a 346 at only 9#s was about 600....i could be wrong though. im learning just like alot of other people...with all that rambling out of the way...proceed!! subscriibing!

engineermike

TNTramair, you're exactly right. However, if you crank whatever turbo up to max boost, the smaller motor will make more power.

slowredz

iTrader: (23)

LTLHomer sure is a dick to everybody that doesnt agree with what he says, LOL

LTLHOMER

iTrader: (10)

How do you figure? I am living proof that you can do everything wrong and know nothing and still run 'ok.' As far as being a dick, well I guess I'll leave that up to you?