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jprince · Post by **jprince** » Sun Nov 11, 2007 4:57 pm

ok ive been running the n2o all summer.. wow the best thing ever, i started with the 55 shot then with greed went with the `75shot (zex kit) and actually been running great. now winter is here and im planing on upgrading some internals, so i can run with the 75 shot with a bit more comfort. Now my plan is that porting my head, nothing to radical, and the comp 400 cam. so a mild top end build. So none the less the bottem end i would like to up grade and the copression ratio is my problem... what would be a good comp? i was THINKING 10.5:1 and some h beam rods? can someone help me out.
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Hilux Surf

Post by **racer12306** » Sun Nov 11, 2007 5:19 pm

what year car do you have?

It would be best to fill out your signature or garage so that people know that for future reference.

running 10.5:1 will require premium fuel, and with nitrous you might have to be careful with that. i'm no nitrous expert, but i would be concerned with detonation.

nitrous and compression love each other, its just you need the right gas to be able for them to be happy.

jprince · Post by **jprince** » Mon Nov 12, 2007 9:00 pm

so then is 10.5:1 good or should i be safe and drop the comp.?? and for the higher comp what gas is recomeneded?
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G31m

ragek23 · Post by **ragek23** » Mon Nov 12, 2007 10:30 pm

id be safe and stick with the 55 shot with the high comp pistons. Id play it safe and use 100octane when going to 75 shot

Post by **racer12306** » Mon Nov 12, 2007 10:31 pm

since you have an 02, the 10.5 should be good. when you are not running nitrous 92 octane (R+M/2 method) would probably be sufficient.

I really don't know about how that much compression and nitrous would work with pump gas. I do not have much experience with nitrous.

I am going to learn though, but it won't be for a couple years. I am thinking of building a 550 - 600hp big block and then spraying 200 - 250hp of nitrous into it, but when I do that I will more than likely use 118 octane as my enrichment fuel. I will actually have a separate tank for the enrichment fuel, vs pulling the fuel off of the rail on an efi system.