Need nitrous jet size information for a Duke (Page 1/12)
The Punisher OCT 21, 02:09 AM
I was hoping anyone with this information could respond. I know there is at least one person on this forum that has succesfully installed a dry nitrous kit on a duke with a 75 I mean 40 I mean 50 hp shot of nitrous. Perhaps he sees this thread and provides the information that I seek.

this will not only benefit me but also the rest of the forum

If anyone else could help that would be outstanding as well.

Thanks


SH

84Fiero2M4 OCT 21, 02:16 AM
Ya I would like to know this also.

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Oslo OCT 21, 02:50 AM
No harm in providing a little information. I would also like to know, and +'s will be given for helpful answers.
86fieroEarl OCT 21, 07:23 AM
It might be safe to say a 30 size jet.... or maybe not.... Im kind of curious how much can a duke actually handle in stock form. I don't think one could use a wet kit unless there was a way to fab up a plate with a nossel but you might need a higher output fuel pump.

[This message has been edited by 86fieroEarl (edited 10-21-2004).]

KRMFiero OCT 21, 10:23 AM
a 87 2m4 I had, as a beater, I tried a .035 jet and it liked it. I put in a .042 and it felt a little funny so I put the .035 back in and did a few smokey burnouts (putting the car up against things) and a couple runs down the road. the car did start giving some small puffs of smoke after that on start up but I was also taking it to probably 6000rpm or close to that anyway. Oh yeah this car had codes previous for crank/cam sensor, o2 sensor, IAC and somethign else i forget it was in very rough running condition so it wasnt the best canadate for nitrous, Running Open header Car dint have an oil change in probably 20,000miles and the tranny was slipping bad before

I didnt just start a flame war or nothing did I? Good luck to whoever does it, mine took it!


Kyle

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FastIndyFiero OCT 21, 10:56 AM

quote
Originally posted by KRMFiero:

a 87 2m4 I had, as a beater, I tried a .035 jet and it liked it. I put in a .042 and it felt a little funny so I put the .035 back in and did a few smokey burnouts (putting the car up against things) and a couple runs down the road. the car did start giving some small puffs of smoke after that on start up but I was also taking it to probably 6000rpm or close to that anyway. Oh yeah this car had codes previous for crank/cam sensor, o2 sensor, IAC and somethign else i forget it was in very rough running condition so it wasnt the best canadate for nitrous, Running Open header Car dint have an oil change in probably 20,000miles and the tranny was slipping bad before

I didnt just start a flame war or nothing did I? Good luck to whoever does it, mine took it!


Kyle


LMAO...

Nice.

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Paul Prince OCT 21, 11:26 AM
Holley says a 50 shot is a 32N and 42 bypass. A 75 shot is a 38N and 42 bypass. But you have to be able to tap into a the fuel pressure regulator to tee the bypass. Some TBI systems don't have that, not sure about the duke.

NX wet is 35N and 26F at 9-13 psi of fuel pressure for a 50 shot and 41N - 28F for a 75 shot. NX is a wet system, Holley numbers are for a dry system...............Paul

The Punisher OCT 21, 03:37 PM
Thanks guys. this is sort of what I am looking for.

However Paul the jets you listed are the jets fora 6 cylinder. I need them for a duke engine

Anyone else? Second opinions?

Fiero5 care to help out here? I know you installed a nitrous kti onyour duke. What should I as well as other forum members install jet wise on their duke engines?

I know you spent much time on teh phone with Holley. Waht did they recommend to go with?

THanks

SH

fiero67 OCT 21, 03:42 PM
my son wants to to do this to a duke as well. I dont have any knowledge on these systems at all. Maybe someone can do a write up on this for us people that want to beef up the little ole duke. Thanks in advance for any info. John

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Doug Chase OCT 21, 04:06 PM

quote
Originally posted by The Punisher:

However Paul the jets you listed are the jets fora 6 cylinder. I need them for a duke engine


I don't know squat about nitrous installation but...

Since the 4cyl is 89% the displacement of the 6cyl couldn't you just reduce the jet area in the same proportion?

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Doug Chase
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