How much juice is safe with pump gas? Will compression change the ammount of nitrous you are able to run on pump gas?

I have an 8.6:1 383 blower motor in my garage: 4-bolt, all forged, ARP hardware, o-ringed with iron heads. EFI is expensive and so is turbo plumbing; blowers are blatant. Considering nitrous.

[This message has been edited by racr4jc (edited July 31, 2002).]

 

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I don't recommend spraying on pump gas. Just spend the extra couple dollars and run racing fuel. When I'm down on cash, I run a 50/50 mixture of 100 octane 76 racing fuel and premium and it works good. Racing fuel helps prevent detonation. Lower compression helps a little, but ignition timing is waht makes the big difference.

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Blue 1994 Z28
Moroso CAI, March underdrive pulleys, Jet throttle blade, Comp Cams 1.6 rr, Accel 300+ ignition, HPPIII, Accel adjustable fuel pressure regulator/gauge, Nitrous Works wet kit (175hp), FLP race-prepped 4L60E, Coan 2800 rpm convertor, LS1 driveshaft, 4.10 gears, cat removed, Flowmaster American Thunder. Moser 12 bolt soon.

 

not sure on your app there, but with my stock lt1 (internally) i run 93-94 and hit it with 150 dry kit. seems to run pretty dfecent and not knock too much more than usual (could be my exhaust). never hurt to run the expensive gas.

Mike

 

Here is an off the wall idea.....Just bump your timing down and not worry about it!!!! 1 degree for every 25 horses and you can run 93 octane all day long. Just a thought.

Remember.....Do it the right way and you will have a running car in the future

Later

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1989 Formula 350
K&N air filter, air foil, TB Bypass, AFPR (set at 45 psi), A.I.R. yanked out, Accel 8mm wires, Fireball external coil, Pulley (just the crank), gutted MAF, corvette servo, Hooker super comp. shorties, 3" exhaust all the way back, No cats, Flowmaster 40 series muffler (one in one out turned down)---Developed a bad habit....bottle related!!!!75 Shot of Nitrous
http://www.theformulasource.com/owne...php?siteid=144

So they made him get rid of it...For decency ya know....But it came back the next day...

My webpage:www.cardomain.com/id/1fastformula

 

Is the 8.6:1 compression ratio going to help with detonation or am I completely missing the boat on horsepower? The motor has iron heads so 9.5:1 is like the highest recommended with pump gas.

I was thinking with compression this low, it'd be hard to make the thing detonate (I'm sure I can but it'd be more of a task than with 12:1 CR).

The problem with running race gas is I want to drive this car, and I live in California (which makes it hard to come by).

 

Your right on track. I'm spraying 250 with approx 9.5:1 383 on pump gas, only pulling out 4 deg of timing. Course I'm running alum LT1 heads, but I'm sure you could do the same with iron heads and 8.5:1. If you go up to 300 or more, I'd play it safe and throw in some race gas though.


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If I'm playin, I'm sprayin

93 Z28 A3 - w/ Jet Hot coated Hooker LT's and true 3" duals
(hiflow cats, cutouts, and Car Chemistry insert mufflers)