I have a compucar plate kit and it hits pretty well but my times are not what they should be. The car runs 8.50's @ 82mph on the motor. With a 100 shot with the plate it ran a 7.95 @ 86mph (with a better 60' than the motor pass). With the motor times and a 100 shot it should run some 7.60's. I haven't heard great things about the Compucar plate b/c it has the two seperate bars and I feel it doesn't atomize the mixture well. Anyways I was wondering if anyone out there has tried both or has a secret to this plate. Thanks for the help.

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95 Z28 6 speed
Sprayed with other go-fast parts.

 

I dont know...picking up a 1/2 sec in the 1/8 isnt to bad...that would be a full sec in the 1/4. Anyway ..the biggest problem with the plate is unequal ditribution of nitrous...the cylinders next to the plate tend to get more than the others.

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Greg
95 Z28 conv M6
Georgia F-Body Association

Stage 1 heads, 1.6rr, Meziere WP
lt4 hot cam,lt4 timing chain kit,52mm TB,
Hooker Headers, Pro 5 shifter,3.73s,
NX 150 progressive,
Self-tuned via Tunercat

 

I just install a Nx kit on my car and just began to work on getting it tuned in. I'm only running a 75 shot right now and knocked off a full second in the 1/4 and a little more then 1/2 second in the 1/8. So I think you'd be better with a fogger nozzle of some sort.


1995Z basics, 4:10's, Nx kit

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I agree to go with a nozzle, but its not the plate that is causing you problems. Its the Compucar tuneup. They use a 5 to 1 nitrous to fuel ratio, and NX uses close to 9 to 1. Basically, the Compucar tuneup is way too fat. NX is known for performance nitrous tunes. They will give you the rear wheel hp that they claim. The NX Shark nozzle is the best nozzle on the market period!

[This message has been edited by CustomN2O (edited September 08, 2002).]

 

We use a compucar kit and gain almost two full seconds on 150shot in the 1/4.

in the 1/8....8.30s to 7.teens.
in the 1/4....13.ohs to 11.twenties

That's on a rather delayed progressive shot. 63/35 jets.

I like the compucar tune. No white smoke out the exhaust, no burnt plugs (ever) and everything stays together.

On a side note....we're going with a dual EFI-blaster fogger setup next year for better distribution and larger shot. The plate only does well up to about 200hp before you start having serious distribution problems.

 

I just put a compucar nozzel on and sprayed it last night and holly ****. There was no lag. That thing just hauled ***. Anybody want a plate?

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95 Z28 6 speed
Sprayed with other go-fast parts.

 

Doesn't matter if it's a plate or a nozzle..
if it's being sprayed in at the front..
You WILL have distribution problems..
simple physics..the farther it has to go..
the fuel is heavier and it separates and
and a larger portion of fuel goes to the back cylinders..
meaning a larger portion of N2O is going to
the front cylinders...
just look at the plugs..they'll tell you it's true..
lean front to back..front plugs lean..
back plugs rich..
only two ways around it..
go for a full fogger(1-nozzle per cylinder)
or do what I did..
have a custom set of spray bars intalled
inside the intake where the bars are drilled
over the intake runners..
distribution is equal..car gained 3 tenths
over a plate or single nozzle spraying
the same amount..

later,
matt

 

Do you have pictures Matt?

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1987 Flame Metallic Red IROC-Z Camaro. LT1 motor installed. http://home.attbi.com/~markolc

 

not of the bars themselves..
but the guy who did it might..give him a call
his name is Richard O'Malley..he does alot
of custom stuff..NOS..Nitrous Works..etc..
he owns several patents and shares a few with
barry Grant..
he is currently the on-site Nitrous Works
tech support for the NMCA races..
here's his number :
919-258-5123

later,
Matt

 

Matt, though what you say is partially true, it isnt 100%. You can run into some real distribution problems in those manifolds when you start spraying fairly large amounts of nitrous through a single nozzle. But I have very successfully used 150hp worth on nitrous, at the rear wheels, without any problems with distribution. Most of the distribution problems come with a poorly designed nozzle, and a very fat nitrous to fuel ratio.....(example NOS). There is alot of extra fuel being sprayed with the nitrous, and with the very poor atomization at the nozzle, the fuel begins to do what you described. Using a Shark nozzle however, atomizes the fuel well enough that we didnt notice enough problems to worry about with the 150 shot. Very slight differences, but not enough to get scared. Granted, we werent running it on the ragged edge like we do our race cars, but hey, it still made 157hp at the rear wheels, so what more could you ask for. The nozzle is alot softer hit then the spray bars also. When you start playing with the higher levels of nitrous, I agree with you 100%, but then who would only be using a single nozzle anyways. If you have a motor built well enough, to be capable of injesting 300-500hp worth of nitrous, you most defineately would already be upgrading to a direct port style system anyways.