fxbdydriver

iTrader: (6)

I'm contemplating building a new forged shortbock for my lq4, s475. I have a powergilde, 3.73, 27" tire (planning to use 28"). My car weighs 3217 with me in it. Only 1/8 mile track, street driving. With stock 317's, could a destroked 6.0 benefit me more with powerglide in 1/8 mile run? My s475 is t6, 96mm 1.32 a/r. I have tick turbo cam and ls6 intake, e85, non intercooled. A new cam would be needed. Would have to change heads or port, and change intake to gain benefits of more rpm? At the end of the day, would destroking be worth it??

DEFYANT

I'd go with the most cubes possible, without choking out the turbo of course. The 1/8th mile requires torque, the more cubes the more torque.

stevieturbo

What are you actually trying to achieve by de-stroking ?

Do you need to run very high rpm's ?

mkvamso

iTrader: (2)

Rpm is limited by the valvetrain
The shorter stroke doesn't mean you have the ability to turn more rpm, it means you'll need to
You're spending money to give up power doing the destroked deal

fxbdydriver

iTrader: (6)

I was just wondering if turning more rpm would keep you in boost longer, maybe faster overall with turbo. I guess more cubes and more torque is better.

stevieturbo

Correctly sized turbo and good boost control will keep you in boost longer.

More power will make you go faster, not necessarily more rpm's

Blown06

iTrader: (32)

That is not entirely true.

DEFYANT

I have to agree with Blown06 on this. So many factors, adding power doesn't make all the difference.

In all reality if this car is being built for the 1/8th mile, then you're going to need to be able to hook, and make some steam quick. Go with the 364 (or 370), get a good cam, and let er eat.

stevieturbo

Well if I want to go faster, I'd certainly take more power over less power.

JoeNova

If I ever throw a turbo LS in my dragster it will use a 4.8 crank. I won't need the sub-3500 RPM torque advantage, and I could use the mechanical advantage of a longer 1st gear and a better rod/stroke ratio. I might actually throw in a gen-4 4.8 to kick things off and see where it goes from there.

In a heavier 1/8th mile car, the extra torque might be of an advantage.

RonA

iTrader: (1)

Short stroke gets bashed here every time it comes up, but everyone I've talked to that has built one has loved it.

dezlfrek

iTrader: (1)

like Ron said^^^. I love my mini motor. +.050 4.8 motor so its 302 cid, ran 9.34@145 on 17-18 psi this weekend, 3600 stall, 3.25 gears, 3420lbs..

RonA

iTrader: (1)

Your friend Rich cracks me up. Big difference between a parts seller and an engine builder. He's definitely a builder.

Blown06

iTrader: (32)

Of course you would. Originally you weren't comparing more power with less power. You were comparing power with rpm.

stevieturbo

The same power but at a higher rpm, generally speaking wont offer any benefits unless your gearing was very bad to start with or something, or it was some extreme torque monster to start with though.

At the end of the day, if you dont have the power, you wont pull the speeds regardless of where the rpm's are.

RonA

iTrader: (1)

I have often wondered how the two stack up longevity wise.

DavidBoren

Longevity-wise, the short stroke engine is taking less of a mechanical beating, in juxtaposition to a longer stroke motor. The working angles are better with the higher rod ratio so every part of the rotating assembly is under less stress during every motion.

To the OP,
Destroking may help traction in a lightweight chassis, but if you aren't having traction control issues, then I would really be dubious of dropping any displacement with a big 96mm/1.32ar turbo.