WhiteRubi

Hey fellas. New guy . Here just wanting some help for a buddy. Here is the story
2002 ws6 stock with a 76mm precision. Car was making 560 to the wheels but broke 2 pistons and cracked the block. Now the rebuild. Keeping the 76mm and price difference on short block under $1k what would you do and why: 346 or 383 stroker? 6 speed daily driver. He already has a 383 lt1 running mid 10's as a toy. The TA may end up a race car in a few years.
Also, given stock heads and a turbo cam, on pump gas, estimated horsepower difference in the stock displacement and the stroker?

thanks in afvance guys.

soccerdave

iTrader: (2)

Cubic inches are always the way to go if you have a choice, but they tend to end up into cubic dollars

JoeNova

What turbine on that turbo? A smaller engine will often make more power when pushing a turbo.

Also, if you broke 2 pistons at 560whp you did it because of a poor tune, not because of too much power. Make sure you correct the tune or you'll blow the new short block.

WhiteRubi

I'll have him check on turbine size. All I known is its a precision 76 with no upgrades. the question of the smaller displacement with that turbo was what he/we were questioning. also, does the potential exist that the turbo is damaged? The car will be tuned by another tuner this time around for sure.

WhiteRubi

Its a pt7675 assume its stock 84 turbine.

willizm

iTrader: (10)

I have that turbo and if you are sticking with that turbo I'd honestly not go any larger than a 370ci iron block myself. Making decent power out of a 346ci currently.

WhiteRubi

What's the current setup? And honestly, what would numbers look like in a aluminum 383 on 93 pump gas?

Forcefed86

iTrader: (4)

PT 76/75 has a 75mm turbine... I'd go with a bone stock 4.8/5.3 with 317 heads and spend the remainder on a good tune and or fuel system upgrade. Engine shouldn't have let go at the levels you were at. No need for more cubes with that turbo IMO.

blue99fbody

iTrader: (5)

go small cubes

WhiteRubi

I think he's decided on fully forged L33 383. upgrade the turbo in a year or so and go from there. this is a daily driven car and will likely replace the N2O lt1 toy. Buy bigger cubes now in prep for bigger turbo down the road. Thoughts?

Ryans99ls1

iTrader: (16)

Bigger cubes means bigger turbo. If you stay smaller ci, you can get away with a smaller turbo and still make the same power at the end of the day.

whitedevilWS6

iTrader: (10)

Whoa, buddy. Hold on...an L33 has a bore of 3.780 and will not yield 383". It is an aluminum block, so you can't bore it out like you can the iron block. For 383ci you need a 3.905" bore and 4.00" stroke. You would need an LS1/6 block if you wanted 383 aluminum.

That being said, I'm thinking about a turbo build myself, but honestly I'd get a cheap 5.3 or 4.8 and run 317s and an LS6/9 cam. At least then if it lets go again you don't have a lot of money tied up in it. But it shouldn't, not even close.

WhiteRubi

http://www.thompsonmotorsports.net/p...products_id=12

Ryans99ls1

iTrader: (16)

You can bore an L33 to 3.905", which means you can throw a 4.0" crank in and get a 383 out of it.

whitedevilWS6

iTrader: (10)

Hm. Got me wondering what they did...maybe the L33 block is similar to the LS1 block, just with thicker sleeves, so you can bore them out?

whitedevilWS6

iTrader: (10)

Gotcha. Well, that seems like a solid starting point then, if you're a little gun shy of stock motors. That's what happened with my build..haha.

Ryans99ls1

iTrader: (16)

A stock bottom L33 with a 76mm is a proven combo. If you want 700-800hp (or less), i wouldnt even bother building a motor. Just run good fuel and get a solid tune in there.

WhiteRubi

Again, pump 93 octane on a daily driven car? I ask because he does not want to do e85. and it WILL be upgraded to bigger boost and e85 tune in a year or 2. That's wh the consideration of 383.

Ryans99ls1

iTrader: (16)

you can make 500 very safely on 93. If you really are planning on E85, then i would definitely stick with a stock bottom L33 cus that will make things even safer when you turn it up.

If you only want to run 93 then forged/big cube is your answer. E85 is very forgiving

JoeNova

93 and meth have been pushed to well over 800whp on many occasions. Want more power for the track? They probably sell race gas there. Put it in and turn up the boost. With E85 you'll need to buy a drum or hope you don't ever drive anywhere without an E85 station.

The L33 is back on its third trip around as the fastest stock bottom end. If he plans on going with big boost there is very little reason to upgrade the cubes. Smaller motors are better at keeping a given turbo inside of its efficiency range and therefore make more power. The only reason to go bigger cubes is if he absolutely feels the need to. Then you are giving up one of the BEST things about the 5.3 block, the super thick cylinder walls that help keep the aluminum block from distorting.