My boss is toying with the idea of putting nitrous in his vette. I'll start out with the engine specs:

427BB
Heavy duty connecting rods
Heavy duty forged crank
TRW forged 11:1 pistons (this is the only thing I don't like)
Rect. closed chamber iron heads
Custom L88/425HP intake

This isn't a wuss engine. At the moment, he detuned it for more streetability so it is running ~500HP. The rotating assy is good for 7600 RPM.

He has asked me to research this for him. I have talked to him breifly about it and he is going with a progressive controller so it isn't as harsh on the drivetrain. He is looking into the 150 HP systems. My concern is the CR. I don't know that much about nitrous but the 11:1 scares me.

Any help you can give me would be great, if you need more info, just ask!

 

A 150 shot is smallish, even for a ride of his magnitude. If he is just looking for a little more this will be ideal. He is running 11:1? then he has already addressed some fuel quality issues. 11:1 is not that high for nitrous. most nitrous race cars run 13 or 14 to 1. 11:1 will be nice. Just make sure he follows the rule of thumb for retarding timing 2 degrees for every 50 and he will be fine.

 

Oh really? I though it would be the same as adding a supercharger... less compression = more boost. Excelent!

The next issue is plumbing. He wants this to be a stealth install. The problem is with the L88 hood, there is next to no room to even think about adding an injection plate. At the moment he is running a dual plane intake, which has had the riser milled down a little bit. With this style intake and not being able to put a plate on, how the hell do we install the nitrous/fuel?

 

nitrous loves compression, he will just have to keep good fuel in it.

he could do a fogger under the intake manifold. very nice, but quite expensive, and the propensity for solenoid damage is high.


adam

 

those intakes work fine for nitrous. if he doesnt have room for a 1/2 inch NOS nitrous plate then, a port fogger system would be warranted. Try to avoid the undermanifold as an option. They are not a good first nitrous project, because you have to remove the intake to re-jet for tuning. I believe nitrous works has a super slim plate, but I havent looked into them in years

 

plates arent stealthy.
why is he trying to hide it? hell, what does it matter if people know hes spraying, if he is only spraying a 150 shot, they may laugh at him, but other than that, nobody cares.


adam

 

Sorry to highjack a post but do you guys have any information on the under the manifold foggers? The only ones I've seen are for NOS. Does NX make a kit or are all the hidden DP a custon install. I'm looking for something adj. from 100-300. Thanks.

 

onebadwagon:

Out of curiousity... A ~500HP vette with a 150 shot isn't exactly a car that most would laugh at. I sure as sheet wouldn't.

I have driven this car. At 2500 RPM, this thing scared the **** out of me.. and at that RPM it hadn't even started to wake up. Do you have some warped perception of HP that I don't know about?


I talked to him over lunch about it. He has changed his mind about making it stealth. The biggest concern at the moment is being able to get a plate under the carb and then having an even spray pattern because of the riser. At the moment it has been milled down ~3/4" from being flush with the top. What kind of plate would be used with this setup? I was thinking about using an X style instead of a normal (cheap?) single bar style.

In terms of making a direct port setup. Do the solenoids HAVE to be close to the ports, or can we mount them away from the engine (and heat) with no ill effects?

 

are you SURE it makes 500 hp?

and spraying a 150 shot on a big block is what i was talking about laughing at.

big block internals are VERY strong, and they LOVE nitrous.

a 150 shot on a big block, is like saying you would spray a 75 shot on a small block, its not worth the time.

PILL UP, BOYS!!!


adam

 

I only suggested the 150 hp shot because he is a first timer. let him get addicted then the rest will be up to him.

 

he brought up the 150 shot, in the first post.

adam

 

I know people who have put a 150 shot on thier big blocks and got Second faster in the 1/4, I think its a good start!

 

a 150 shot on a big block is still TUNING to me, lol. yeah, but when you pick up close to TWO seconds from a 250 shot (not always, just saying) and you dont have to worry about spraying rods/crank/pistons all over the asphalt then why not?


adam

 

so are you telling me that I cant suggest 150 as opposed to the 200-250 that everyone else is suggesting?

 

no, i am saying that you can suggest whatever you'd like, you could tell him to run a sneaky pete on there, if thats what you felt like advising.

im saying that spraying a 150 shot on a big block, is like licking a nice pink nipple, its fun, but there is more fun to be had, with the parts that you are using...


adam

 

I wont disagree that more is better, or that he could even. Im just saying 150 is a nice starting point for a 350 or a 540 either way.

 

-From the owner-

:lala:

"It dyno'd at 615HP @ 7600RPM, but found the 12:1 pistons and L88 cam were not much fun on the steet. It was detuned to 11:1 pistons and a milder cam. It then dyno'd 525HP @ 7400RPM"


-Me-

It's not like the engine can't handle a large shot, its the rest of the car that will revolt and promptly explode. He keeps a constant supply of rear ends and half shafts available.

 

keep it on street tires and play highway games.


adam