NITROUS ON PUMP GAS HOW DO THEY DO IT?

[victtor]

HI just lookin at the the last couple years editions of the pump gas drags in hot rod mag u guys run in USA
I have B/B zz454 forge pistons comp roller ,rmp airgap ,with zex perimeter nitrous plate ,have been using BP 98 unleaded pumpgas on 100 shot the ngk -8 plugs look good ,what i need to know how do those guys at the pump gas drags use large shots off NOS with plate systems on your guys 93 octane fuel ,i have used my 200hp shot on avgas to scared to go above 100 shot on 98 pump fuel
I would like to even use the 150 shot if all possible have any you guys used pump fuel on the 150 shot?
What are the secrets to using bigger shot off NOS on pump fuel? do you take out a heap more timing ? or up fuel press?
Some adivce would be good on this matter because were i live race fuel is and avgas is very hard to get hold off and super expensive
Another quick ques whats your thought on mixing pump fuel with avgas some guys are dead against this ?
THANKS again for all you guys help victtor new zealand
http://www.nastyz28.com/forum/images/statusicon/user_online.gif

[victtor]

HI guys can a few off u guys help me out on the above ques there must be a heaps guys out there on this nitrous forum the can help me out please
thanks victtor

[fasteach]

well, i'm not the expert you're looking for...but i'be been shooting 225hp on 93 octane for years in my street car without problems. BUT...my motor is alot smaller than the one you describe (306), so i can do things you big boys can't. Also, my compression is alot higher than yours, probably. (13:1).
all i do is retard the nitrous 2 degrees per 50hp, and keep a keen eye on the plugs for mixture and heat range, and tune from there...no real secrets.
the biggest thing i would say is to get the "muscle" tune-up dialed-in before jumping to the retard box for answers...keeping the plugs happy will keep the motor alive. It probably wouldn't hurt to give your nitrous company a ring and get their recommendations before you venture too far into uncharted territory. hope that helps. Duke

[victtor]

THANKS fastech for reply thought no one knew anything about this subject there for a minute ,here is some more specs to help u guys answer me ,9.6 comp,230/236@50 eledbrock 110cc heads ,rpm airgap ,digi 6 cranking compression 160 psi ,whats the most hp shot with plate system u guys run on dual plane airgap s/b or b/b thanks
victtor

[fasteach]

Oh, good grief...i wouldn't hesitate to lean on it then...my cranking compression is 220psi, with 13:1. my 1st stage is 175, and 2nd is additional 100. BUT, remember, i'm a small smallblock. Again, i'm no expert...but with your 98 octane...i wouldnt even worry about it.

[steel town]

I run a 406 SBC with just under 10.1 .flat tops with an open chamber head on 94 octane pump gas I stuff 225 through its yap and it loves it I don't even pull timing out but thats not what I would recomend it just happened that way. Oh and I've never raddled the bearings out of it .It's gone 10.20 @ 135 Mph buuuuuut it may have gone faster had I tuned it proper