nos set up

[southern boost]

what chip would be best with nos say 50 or 75 shop and how much do i need to back off the boost and any other tips would be helpful . thanxs randy

 

[southern boost]

hey guys need some help on this set up pls. thanxs randy.

 

[Kibster]

Southern Boost (Randy)

Why not check with Jay on the chip. With a light load of Nitrous (50-75 HP) - most recommend a couple degrees of retard.

Assuming your current state of "tune" is dead on - maybe he could burn you a similar chip to what you have, minus a bit of timing?

As for boost, it would probably be prudent to start conservative and creep your way back up - where that is on your combo, you'll have to decide (others claim a increase of 3-4#'s boost w/N20 - so take that w/grain of salt and take a couple more #'s for insurance).

I'm still a bit uncomfortable with fuel pressure as I think ahead.

As the fuel pressure is boost referenced (the 1# of fuel pressure increase per 1# of boost rule) - fuel pressure to the fuel solenoid is going to vary accordingly. Assuming 40# static fuel pressure and 20# of boost, you'd be seeing approx. 60# fuel pressure at 20# of boost, an increase of 50%. If one is conservative to begin with, you'd tune it a bit rich to begin with - so the rich would get richer with more boost (correct?). Makes one think about a second FP regulator at some point.

As this is how the NOS kit (05301) works - and indeed it seems to, I may be worrying too far ahead.

Let me know who you turn to for a chip...

 

[wilkinshc]

If you run 50 shot, run 2lbs lower on the boost, 2 degree less on timing, 75 shot run 3lbs lower on boost, and stay with 2 degree less on timing. Make sure your fuel pump is up to the job, some have use stock pumps and have been alright but I would change it to a walbro for insurance. Might consider one colder on the plug also. As for gages I would have a fuel pressure gage and knock gage. If you run out of fuel, chances are you will be changing headgaskets. If it is a new NOS setup also check the jet size, they usually send them out with the gas jets 2 sizes to large.

Not sure what your setup is but with a stock setup(except fuel pump, adj fuel reg., and good tires it's not unusual to see a 1.5 second increase in 1/4 et.

Chuck