Pill Size

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

pill size for nos cheater system, 150 shot. When i bought the kit from my neighbor he said it was sat up for 150, i pulled the jets out and read what i believe said 190 and 55 but i could be a little off, when i went to nos website it said something tottally different.

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

http://www.nitroussupply.com/baselines.php

Ok i got a question on this site, it says runnin 150 on a super powershot your ok with 93 octane, it says runnin 150 on a cheater system and you must use 100+ whats with this?

clay · Posted: Tue Mar 03, 2009 9:35 pm Post subject:

Actually it says 92 octane with octane boost or 100+ racing fuel for the SuperPowershot. The Cheater does specify a little more octane and here's my guess. More than likely somebody with a street car will realize that 150 h.p. is plenty and buys the SuperPowershot system. It gets installed on a lower compression setup with a little more fudge room on the tuneup. Since racers are a greedy sort (me included) the Cheater is the best bang for the buck by far and I believe the most popular system NOS sells. More than likely if this is going on a race engine it will have a decent amount of compression and this will require more octane to keep things under control. That's my guess. Clay

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

so what would you reccomend, im runnin iron heads at 9.5to1 compression, 93 octane. Pulled 3 degrees of timing and plugs are two sizes colder. Should i be alright with 93? Also do you feel that a 150 shot is two much for a externally balanced nodular iron crank 6inch rods and kb hypers 383? I also have a dedicated fuel system just for the nitrous which includes a holley blue pump its own filter and a holley pressure regulator.

10sec.et · Posted: Tue Mar 03, 2009 10:20 pm Post subject:

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

its a fuel cell with dual outlets at the bottom Laughing

http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D293220%2DS&N=700+4294925239+400304+4294839036+4294920243+4294903820+115&autoview=sku

10sec.et · Posted: Tue Mar 03, 2009 11:03 pm Post subject:

well, if youre a street racer then that kinda sucks. then again, so does street racing. when youre at the track, just put some race fuel in it for running the nitrous.

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

na i hardly ever race at the track, and dont street race really. I am however going to race my buddy and am going to use the nitrous, what do you recommend for fuel while im on the nitrous?

Big Dave · Posted: Wed Mar 04, 2009 10:37 am Post subject:

Higher octane fuel! Detonation is deadly. One race with the wrong set-up and your motor is through.

By the way the stronger Keith Black Hyper pistons are still cast. When they fail they shatter like glass leaving your forged rod to flail around in the block like two nijas in a Kung Fu flic. Which reminds me of another great movie line.

"Well do ya feel, lucky punk? Do ya?"

Big Dave

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

so could i do like half and half 110 and 93? If i knocked it down to say a 125 shot would i still have to run race gas? Ive made one good pass on the nitrous with 93 and the setup above.

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

ya i know those kbs are strong piston's but like you said detonation and there dead, ive heard that before. I think i may have asked this before, but say i wanted to go with a set of forged pistons, would i have to rebalance the whole assembly?

clay · Posted: Wed Mar 04, 2009 12:40 pm Post subject:

I ran the NOS jetting for a 150 shot on a 9.8:1 motor using 93 octane for years. I pulled 8* timing as well as I can remember. I've heard mixed opinions on the dual fuel thing. I agree with the idea that running pump gas through the carburetor and race fuel through the nitrous system could potentially cause problems. The theory is that there isn't enough time for complete fuel mixing to take place and there could be "pockets" of lower octane in the combustion chamber that could still detonate. You have 400 h.p. or so of pump gas and only 150 h.p. of race fuel going into the combustion chamber. Mixing in the tank solves this problem. What the pump gas limit boils down to with me is how far is the motor alone pushing the limits. If it is a 400 h.p. 383, then by all means a 150 shot on 93 octane should be just fine. If it is a 550 h.p. 383, then the limits are already being pushed a little on pump gas and I would personally add some octane with a 150 hit. Clay

clay · Posted: Wed Mar 04, 2009 2:35 pm Post subject:

Another way I look at it is that fuels have a cylinder pressure limit. As long as this limit doesn't get exceeded, everything is o.k. It doesn't matter where the pressure comes from, the total is what matters. To me this is why a 150 shot on a 454 is different that a 150 shot on a 283. Nitrous systems are fixed output so it requires much higher cylinder pressure to generate 150 h.p. on the 283 that the 454 hence you can use more nitrous on a larger engine - larger area to push against plus the longer lever. This is the reason nitrous usage is rpm dependant - their fixed output. 150 h.p. at 2000 rpm requires much higher cylinder pressure than 150 h.p. at 6000 rpm. Really cylinder pressure actually directly relates to torque output and h.p. is calculated, but for this discussion that doesn't really matter. Clay

robins44 · Member Joined: 29 Dec 2007 Posts: 603 17699.76 points

well i know theres no way this engine is making anything more than 450 horse. If i had to guess id say right around 400, maybe a little less. So you think i should be fine on 93 and 150? If you think the motor will survive i will continue to spray 150, and keep it out of detonation!

clay · Posted: Wed Mar 04, 2009 2:58 pm Post subject:

Personally if it were mine, I'd pull out more timing that you are. I think one of NOS's recommendations is 2* / 50 h.p.. This would be 6* retard. Add another degree to two for safety's sake. Don't use if the engine is really hot from stop and go driving. Don't use it at too low of an rpm. I guess what I'm saying is that sure you can do it, but your "oops" window is getting sort of narrow. Higher octane fuel provides more room for tuning error. Make sure fuel pressure is good. Really dot your I's and cross your T's. Clay