well im sure most of you dont remember, but i use to have a procharger on my lt. i ran into some problems with it, so i sold the procharger and the car sat while i went on with life. well i am now considering running nitrous on it, but i wanted to her what you guys have to say. here is my motor specs.
bored .030 over
forged je pistons
eagle rods
lt4 intake manifold
manley valves
crane gold rockers
scat cast crank
mild comp cam
stock ported heads
9-1 compression.

Would you guys feel safe running nitrous on this setup? if so, how big of a shot?

 

9:1 compression is a bit low for nitrous.

 

I would phrase it a little different...a compression ratio of 9 to 1 is obviously a little low in general terms for what the LT-1 design can support and you will be leaving some power on the table when running this compression ratio normally aspirated. That being said, nitrous could care less what the compression ratio of the motor is. In other words, there really isn't an "ideal" compression ratio that is optimal for nitrous. Suffice it to say, any motor will respond positively to being sprayed. The real question is how much do you plan on spraying it with? What are the ring gaps currently set at? Like any good nitrous setup, you should consider all the necessary safety devices as well.

 

175-200shot tops

 

200 easily man

 

I'd start off on a 150 and go from there. I've got one internally stock that's been on a 200-225hp kick for a year now, gone through close to 20 bottles and hasn't skipped a beat. these motors are tough thats for sure!

 

Make sure the rings are gapped to be nitrous friendly, since it was gapped for boost (im guessing?) then I believe you should be ok with nitrous. Unless im dead wrong and FI ring gap, is closer opposed to further apart. Chances are, you should of bought a forged crank, or kept the stocker however.

 

n2o does not care about compression. Higher compression will provide better n2o gains but it doesnt matter how high or low your motor is.

What would limit the amount of n2o you can use on this motor would be the rings and if its a 4 bolt bottom end or not.

Where do you shift this motor? How big of a shot were you thinking? What kind of n2o kit?

 

I agree that 200 or so is easily doable on you combo....you might be able to push that number a little. That will depend on how hard you want to lean on the motor.

 

Nothing wrong with a 200 shot on that motor.

 

200 plus man...i am guessing your fuel sytem is good and cold plugs already as well if so man i would think a 300 shot would be absolute max on a non forged bottom end. as long as you are not 10,000 it it should be fine.if going over 200 i would recomend a stand alone high octane fuel system for a second stage

 

i have just bought a new forged scat crank from summit but havent installe dit yet...i plan on throwing that in before i put the motor back in (obvioulsy) should i port the living **** out of the heads and intake manifold....im not really firmilar with lt motors....is there anything i can do to bump the compression?
yeah i have a pretty stout fuel system...2 fuel pumps and 40lb injectors
Thanks

 

To bump the compression will most likely take a new set of pistons, but can also be increased by milling the heads, or a thinner head gasket. It will all depend on what pistons are in the car now, and where they are in relation to the block deck.