Converting NX EFI Kit to a Carb setup...questions!
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Joined: Sep 1999
Posts: 2,342
From: MI
Converting NX EFI Kit to a Carb setup...questions!
Ok, earlier in the year I bought an LT1 Nitrous Express kit from a friend and I used it on my 305 TPI engine. I basically plumed the single nozzle into the MAF sensor behind the heated element. Worked lik a charm...
Now I converted to a Holley 600 Carb and Performer intake. I NEED to spray this combination.
Problem lies in the Nitrous jetting, right? The NX kit is for EFI. ALL Nitrous jets should be the same because nitrous pressure is nearly ALWAYS between 700-1200 PSI...no big deal
FUEL PRESURE is what has me thinking. My stock TPI fuel pump is pumping fuel still. It is regulated by a Mallory 3 Port regulator and it sends 6 PSI to my carb.
How would I set up the nitrous kit now? I buy a Carb plate with spray bars in it, right? Then would I need Bigger fuel jets because my pressure is too low?? Would I plumb it before or after the FP regulator?
What is the pressure coming out of the pump if it is on continuously? What is the main line pressure and is it the same at the 6 PSI of pressure coming OU of the regulator to the carb?
Any ideas would be helpful, thanks N2O crew
------------------
Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com
Now I converted to a Holley 600 Carb and Performer intake. I NEED to spray this combination.
Problem lies in the Nitrous jetting, right? The NX kit is for EFI. ALL Nitrous jets should be the same because nitrous pressure is nearly ALWAYS between 700-1200 PSI...no big dealFUEL PRESURE is what has me thinking. My stock TPI fuel pump is pumping fuel still. It is regulated by a Mallory 3 Port regulator and it sends 6 PSI to my carb.
How would I set up the nitrous kit now? I buy a Carb plate with spray bars in it, right? Then would I need Bigger fuel jets because my pressure is too low?? Would I plumb it before or after the FP regulator?
What is the pressure coming out of the pump if it is on continuously? What is the main line pressure and is it the same at the 6 PSI of pressure coming OU of the regulator to the carb?
Any ideas would be helpful, thanks N2O crew
------------------
Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com
Registered User
Joined: Apr 2000
Posts: 555
From: Yakima WA
<font face="Verdana, Arial" size="2">Originally posted by AutoRoc:
How would I set up the nitrous kit now? I buy a Carb plate with spray bars in it, right? Then would I need Bigger fuel jets because my pressure is too low?? Would I plumb it before or after the FP regulator? </font>
How would I set up the nitrous kit now? I buy a Carb plate with spray bars in it, right? Then would I need Bigger fuel jets because my pressure is too low?? Would I plumb it before or after the FP regulator? </font>
Yes you will need different larger fuel jets. This will of course depend on what pressure you run to the system. You have a high pressure pump, though I've never dealt with a High Prsssure tune-Up on a Carb Plate myself (Though I don't see why it wouldn't work).
Normally a 5.5-6psi tune-up calls for a square jet pattern (35N-35F, 38N-38F, etc). Nitrous Express normally runs their systems at 10psi (which is what I'd recommend you try to do.
You need to regulate the fuel pressure if you pull the fuel supply from the line before your 6psi Carb Regulator. From there, you have the choice of using the hi=Pressure (~40-45psi) or Low Psi (~10psi) Tune-ups.
I'd recommend ya get in touch with Ricky or someone else at Nitrous Express to help you get it sorted out from there.
Good luck!
------------------
Kurtis Tamez
LT4-396.com
97 Z28 LT4-396
94 Firehawk LT1-396
Team NW F-Body
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