RideZX6R

I've seen a few videos for 800whp without the use of nitrous.

What's the current record for whp (without nitrous as I'd like to know about "all-the-time" power) and how have the motors been holding up?

I'm curious about getting into a C7 but only if it can make at least as much or more power than my built-347 Twin turbo C5 does.

Is this the mythical "1000whp on a stock motor" engine many have been dreaming of or what?

Motohead279

I believe both LMR and Vengence are over 1000rwhp without nitrous.


Not sure how "stock" you are talking about, but at that HP you would need new rods and pistons.

Late Model Racecraft

This is our TT system with stock engine. I would recommend running no more than 750-800rwhp with stock internals. Customer still has this car in California and is running great.

RideZX6R

I could have sworn the numbers I saw from at least one of those two were on a completely stock bottom end? Maybe I'm mistaken then?

I am talking about a completely stock internal bottom end.

RideZX6R

CA where the gas is slightly better than cat urine. That's reassuring to see so much power on 91 then.

Have you guys (or anyone) done a tear-down of the LT1 and if so what do you assume is the weak point of the internals? ie why the 750-800whp limit?

Late Model Racecraft

We have yet to hurt one so I am going off my previous experiences with the LS1/2/3s....

RideZX6R

This is what I've figured. Someone will have the be the guy who pushes the stock bottom end to the limit, usually someone who already plans to build a motor. Hopefully someone feels particularly helpful in the future to do so.

800whp isn't bad at all... However my 347 is capable of more than that now, so I'm halfway between upgrading my turbos on the C5 or selling the whole car to someone and going in favor of the more modern chassis and (what *might* be) a little less power potential.

C7pimp

It's a no brainer. Get the C7 and go FI. The car drives incredible vs a C5, and having a car with such excellent driving dynamics as well as insane amounts of power will be much more of a joy to drive.

RideZX6R

I also need to test to see if I fit in one comfortably. 6'1 and 250lbs isn't exactly small

0Ron@Vengeance Racing

We have 2600 miles on our C7 making 890RWHP on 14psi and over 1000RWHP with a 100 shot of nitrous. We have put 3 bottles thru it so far with no issue and trapped 148mph in the 1/4 in full street trim on 20" road race tires. This is with a 100% STOCK shortblock. We do have pistons and rods sitting here if/when the time comes. For now, we will continue to push the stock bottom end to find its limit.

Theta

I was trying to buy those rods and pistons off of Ron....

But, at 750whp, it's unanimous (across all the shops that I've spoken to on here) that there's still no need to touch them.

robertf97

There have been at least two supercharged C7's go boom and the piston was the weak link. Mine was one and is getting rebuilt with reduced compression forged pistons, among other things.

http://www.corvetteonline.com/news/b...gine-grenades/

Also, FWIW, GM is using lower compression forged pistons on the 2015 supercharged Z06.

RideZX6R

Thanks for the post sir.
Tuning will definitely be a big thing here.

Theta

I know how yours happened, but can I play devil's advocate and say they were most likely caused by the ****-poor fuel causing detonation?

Theta

Tuning is a HUGE part of this.

robertf97

Mine was lack of fuel (lean condition). I believe you can get detonation from several ways: low octane fuel, poor tuning, inlet temps too high, or longer term carbon buildup in the combustion chamber, maybe others. I am never revving mine up again without the methanol, lol.

Theta

Excellent choice, that's why I parked mine after yours did that, even with Torco. Ordered meth, waited to get a slot for install and then just went nuts with the other upgrades.

Trans C7

672 WHP A6 Circle D Convertor, Headers Meth, by Red Line, 9.1 LBS Boost, 12LB pulley on order for 730-740 whp, stock block cam and heads a moster

Theta

In Carl's case, I'm more worried about his transmission than his shortblock.

RideZX6R

I wouldn't buy anything other than the MT personally, but for those with the 6AT... man I'd be worried too. I'd also be upset with GM for putting the 8AT in it next year