Just thought what do i need to spin LS3 (415-418) to 8k RPM for FI

I like to keep it 14-15 psi and min. of 800rwhp for now

YSI-trim Vortech

Heads ?
Single intake
Callies Magnum Crank
Oliver Rods
Wisco pistons CR # 9.7 - 10

 

Lots of money, hopes, dreams...

Seriously though, you should really consider going solid roller and aftermarket roller rockers if you want to spin up to 8,000rpm. Your best bet is to call up a reputable engine builder.

 

what would be the need to spin it that high FI?? can save you lots of time and troubles running the motor below7k, and you can make just as much power...

 

Yeah, wow! You won't need to spin the engine to 8000rpm to make 800rwhp with a YSi blower. It's going to be difficult to achieve 8000rpm on a N/A engine, now think about what would happen with the extra 15psi of boost on the valves. I think yo uneed to re-think your goals here.

 

Its a thought only

But i will sure keep at 7K

My goal is 7k with 800rwhp i was only wondering is needed for 8K


Do u think guys the LS3 415 is durable enough to handle 800rwhp daily driven
I was going to take it to 418 but just worried about cylinder walls.

 

A good amount of money was the right answer.
We can help you achieve your goals, HKE engines hit 8500-9500 rpms when built for it but your looking at an expensive build up.

So is it really just a topic of conversation or are you prepared to spend the serious money it will take to hit that goal?

 

Do u think the engine 8K - 9K Rpm will handle the abuse from being driven daily.

Thats why i only said 8k but i like to hear what's available it only depends if its worth the money to spend on.

Original Plan was LS3 427 with Darton sleeves but i changed cause its wasn't recommended and risky and i don't want to refresh every year.

Now i think if i keep it at 415 will be best.

 

Well 8-9k... how often does it see that? Whats the application? Its all about money but whats the real goal here?

800 rwhp with the ability to go to 1000?

 

Yeah something like that.

Its going to be for a corvette and mostly street driven by that i mean every day and get some races out of it on weekends.

I just worried about reliability.

 

We aren't ricers, and these aren't Hondas dude... Revving to 8,000-9,000 should not be a "goal" for your project. It should be a by-product of an application-specific custom engine build, not a deciding factor in how to build it.

 

9000 RPM will be extreme for daily driver.
No i want to keep it between 7000-7500 Rpm


My problem is every time i shift gear at 6500 i am out of supercharger power band(4000RPM) it take a moment to start going again.

How good will be LS7 heads on LS3 415?
Is it worth the money or should get CNC ls3 heads?

 

for FI the ls7's will definately be a benefit. its just one of those "is it worth it to you" gains. its not a huge difference but it will be noticable

 

My NA stock displacement LS6 hits 7500rpm no problem, peak HP was at 712xrpm or so, peak torque was at 6100rpm. Problem with reving past 7600rpm is the computer starts to loose crank signal.

 

Do you know if it's any better with the different reluctor wheel in the newer motors? And if you don't mind my asking what lifters were you using, Morels? I wouldn't want to go much past 7,200 with hydraulic lifters, and especially at 7,500+ rpm I'd want to be going with a solid roller setup.

 

i was actually wondering the same thing, i wonder if the 24x or the 52x would be best for higher rpm signal strength. of course something out around the 7500-8500 is borderline not drivable safely on the street. but would be neet to see

 

The cars that were running into this problem were 24x reluctor set up, not sure if the 52x reluctors are any better.

I'm using Comp Cam 875-16 lifters.

 

The older ecu was limited by its clock speed. I think you will find the newer ones are much faster and more powerful.
Think 8086xt vs Pentium4 etc.