we are still in the process of building it up. the numbers we have run though will be in the 500 mark in high alt. at the rear wheels. That should be somewhere around 600 mark at the flywheel. This is on a BUILT motor. there is about 12 going into just the motor, no to mention the ignition, the nitrous, the nitrous controller, the rear end, the clutch/flywheel, the new exhaust and a few other things. find out what your cam is and i could give you a better idea of whether or not your numbers are realistic.

i was looking at like 660 rw and people here jumped all over me. This was long before i ran the numbers and saw what was possible. while most were in straight denial, there were a few that knew what they were talking about. while i agree there is LONG road for 660 out of an LT1, and its not possible without race fuel, they were closed to a lot of the ideas. 500 is a hard number to hit at the wheels N/A. It can be done, but its not an everyday car.

 

I don't believe JE makes Hyperueutiectcici piston's.. Did i spell that right? but i believe the reason why he shouldn't spray above a 150 shot is most likely due to the compression height of the piston in a 396 with what i'm guessing is a 6" rod.. The top of the piston is too thin to run a bigger shot safely.. Not saying it can't be done though.. but carefully.. Mine has a 5.85 Rod therefore having a bigger compression height i.e more material to take the heat... Just my .02 take other's advice get a dedicated fuel system and run some high octane to help avoid the detonation which will turn you motor into a boat anchor.. Good Luck..

 

DrewHMS97SS; where are you having your machine work done at ?

I'm on my second 383 LT4, this time I'm setting it up for nitrous w/ forged internals. I haven't seen to many LT's around the Denver area that are radical like ours.

 

what does everyone mean by a dedicated fuel system?

 

Dedicated to the nitrous system only, usually a seperate pump and regulator. Generally it is only needed when running bigger shots of N2O.

 

Hypereutectic pistons are actually stronger than forged pistons are because of the silica added. But because of that they are more brittle.

As long as you don't run lean, Hypers are fine for nitrous use.

And also, whether your rotating assembly is forged or not, if your rings aren't gapped for big shots of nitrous, don't hit the motor with a big shot of nitrous. because forged or not, if your ring ends butt..... its all over.

 

so am i good to run a wet system up to 150 shot?

 

Scottland174: What do you mean by the rings not being gapped correctly ? I've never heard of this being a problem before, please explain some.

 

It's standard engine building practice to open up the ring gaps a little when setting up to run nitrous or a supercharger. The additional heat generated when the nitrous is used can cause the rings to expand to the point where the gap is eliminated and the fing ends butt up against one another. This can leas to severe scuffing of the bore or even engine seizure. Consult your piston manufacturer or rely on your engine builder for recommendations.

Rich Krause

 

So then it is definently not a good idea to use a gapless ring ?

 

I would not use gapless rings with nitrous.

Rich Krause

 

Cool, thanks for the input. I never knew about that before.

 

I dought you'll even break 400 at that altitude. A stock LT1 at that altitude dyno's just above 200rwhp. I remember you said your car dyno'ed 320ish. I'm sure those numbers were corrected for sea-level.

That's what I have into my 396. Doesn't mean anything.


Sure it can be done, but not at 5,600 elevation. Keep dreaming

 

how about at sea level give or take a few hundred feet

 

I was putting a 250 shot on 355,until it dropped a valve,and broke 6 springs.kinda nervous about that much on mine.You should be okwith a 150 or 200 shot.I have done 150 now with no problems(the last time i said no problems it blew up).