Dear Pro Mod Wad,
I bracket race a 1981 Buick Regal with a 355 ci small block Chevy. The motor has cast flat-top pistons, World s/r heads, Comp Cams 27oh cam, Weiand stealth intake and Holley 03310 carb. Rods and a crank from Summit engine shop. Car weight ready to race is about 3100 lbs.
I race at a 1/8 mile track. The car currently runs 8.10's to 8.30's depending on the weather. The track has a 7.99 cut off for the "pro class" which I want to move into. I want to get the car to about the 7.50 range. I am considering doing this with the NOS Sniper system. I have the following questions:
Thanks for considering these questions.
Sounds like you have a pretty good program going on for right now.
Let me start off by suggesting if you do not already have a dedicated fuel system for the nitrous you should. If you purchase a Holley blue fuel pump it will come with a regulator that you can use to adjust the fuel pressure to the NOS system, as it needs to see its own regulated pressure. You can also use it in the future to fine tune the nitrous.
The Sniper system is adjustable from 50 to 150 HP and I suggest you start at the 125 HP jetting, following the instruction book on fuel pressures, spark plugs and timing settings. This should get you right into the 7.50 zone.
As far as the tire size, that is a small problem because of the torque you will add with the nitrous but I really like your relay idea and I believe that will work well for you. It will also give you the ability to run on tracks with less than desirable traction. If you find it is not the answer then you have the option to get the controller to solve the problem.
The rear end that is in the car now should handle the new power levels with no problems as long as you do not get into severe tire shake situations which is sometimes a side effect created by the addition of nitrous, so be cautious there.
I strongly recommend the 3000 RPM stall converter as it is tight enough to handle a nitrous leave and will allow enough slip to leave on motor only.
Sid, with a little testing time and the adjustablity of both the nitrous system and the fuel pressures as well as time settings, you should find it quite easy to get your goal of 7.50 in the 1/8 mile. Good luck and let me know if I may help you more.
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