Just a quick question, pardon the ricer math here. If you are making say 400hp with a heads/cam combo and then you add a STS turbo kit, will that put me at upward 400s? Or does the 100hp gain advertised by STS only apply to a stock engine?

 

There are alot of variables... but it is safe to say expect around 15-20hp per 1psi of boost... so 5psi should gain you 75-100hp.

 

Ok sounds good. Thanks!

 

Uh oh...
So I made 560 at 20 psi... That means I make 160 Na? Probably right.

Ok, realistically I made 560 at 15 psi. Figure the rough side because my motor is not ideal - I'm probably somewhere in the middle. 275NA 275 from boost.

Many many factors - If its a turbo friendly cam you may make even more, if its lots of overlap (guessing so if its 400 NA) then it may not gain as much per psi. #5 will make some sort of difference though.

 

Well basically I can get an STS kit locally for hopefully pretty cheap and was wondering if it was worth throwing it on and getting another tune for it. The LSA is what was kinda making me think twice as you pointed out.

 

If you can get it for cheap I would go ahead and get it. It can't hurt unless you compression is really high and you can always change the cam.

 

Ok that was the plan, if anything it would make for a good intimidation at redlights


Another question, a local shop is telling me the stock crank can't take more than 500 hp, is that true?

 

Jason Warren-9.3@142, 95 Z/28, 355 LT1, TH-400, LT4 TrickFlows, LT4 intake, stock crank, stock pcm w/recalibration, solid roller, 300shot, 3578lbs.

Thats from LS1tech's fastest LT1 page

 

If I make say 500hp crank and spray a 100shot, will that be too much for the stock rods?

 

How much overlap does your cam have? Thats probably one of the most important aspects of a cam when it comes to turbo's. Less overlap will make for less reversion.

Check out my LT1 with an STS. https://www.camaroz28.com/forums/sho...d.php?t=664161 Lots of pics and videos.

It was a kick in the nuts difference goin on the stock car. My best guess is around 24hp per pound of boost.
I would say that the typical power produciton numbers would definitely apply to your motor as well. With your heads/cam you've made it breath more air in each breath, less restriction. HP potential is based on airflow through the motor, so adding boost should compliment your setup well.

And yeah, I've also heard that 500hp is the generally accepted limit of what a stock LT1 can reliably produce.

 

Um, well LSA is a ummm lovely 107.....

 

The stock crank will be ok. The stock pistons won't take much abuse. The stock rods should take 500RW with ARP bolts and keeping the rpm within reason (6000rpm). The stock main caps will probably be walking around and should get ARP studs.

You cant really rate any rod by horsepower.

Your best bet for a budget build is stock crank, stud the mains, Scat forged rods 7/16 bolts, SPR or other budget dished piston. If your stock bore is ok just hone it and run a standard bore piston to save $$ on machine work (ie - none)

-Scott.

 

Well plan is def new forged pistons, looking at a set of Mahles now. Maybe a set of Scat I rods and of course all ARP. If I keep the rpms below 6k, should the stock mains be ok if I use ARP?

 

My take on it is if you want 500-600 Flywheel HP then 2-bolt mains with ARP studs will be ok.

Here is a link to the Scat rods I think would be good with larger 7/16 screws

http://store.summitracing.com/partde...6&autoview=sku

When looking at pistons you want a dish to get you around 9:1 SCR with boost.

Good luck,
Scott.

 

http://www.kmjent.com/cart/product.p...7951764&page=1

These a step above stock rods and would most likely still be overkill for my project.

Boosted- What kind of CR are you running?