Small update, but everything counts!
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From: Deerfield Beach, FL
Originally Posted by Noyzee
your main injectors may be close to the edge! and for cheep insurance, i would run a higer octain in the main tank, and more of a 116 in the stand alone.
try 104 or110 in tank, 117 in stand alone, and bump the timming up 2*.
hello 9.3!!!!!
try 104 or110 in tank, 117 in stand alone, and bump the timming up 2*.
hello 9.3!!!!!
If I ran a higher octane in the tank, it'd have to be 104, don't wanna kill the o2's, still runnin off the o2's, haven't done an open loop or speed density or anything like that yet cuz I still haven't picked up a wideband.
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From: East Side Performance! mASShole
Originally Posted by Loudmouth LS1
I was actually wonderin about the injectors myself, but the dry isn't puttin down that much power, the .51 jet only put 70 to the wheels and the motor on the nitrous tune puts about 42x to the wheels, so I don't think i'd be over doin it on svo 30's which are like what, 36's on our cars? So i'm probably lucky if i'm gettin 100 - 110 to the wheels out of the .62 jet.
If I ran a higher octane in the tank, it'd have to be 104, don't wanna kill the o2's, still runnin off the o2's, haven't done an open loop or speed density or anything like that yet cuz I still haven't picked up a wideband.
If I ran a higher octane in the tank, it'd have to be 104, don't wanna kill the o2's, still runnin off the o2's, haven't done an open loop or speed density or anything like that yet cuz I still haven't picked up a wideband.
try that and see.
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From: Deerfield Beach, FL
Originally Posted by 01_ram-air
Nice runs Devon, was fun watching you pull the wheels. One of these days I'll post the video of the 9.49 run
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Originally Posted by ls2formula
Also you need to make sure you clean out the inside of your intake.Good chance some of the spark plug is in there.
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From: Deerfield Beach, FL
Originally Posted by Noyzee
i wanna see the vid 
I would bump up the injectors. I am at 125% NA on the 28s from GM and I am cam only. 30s would probably do for me but I want to go bigger for future plans. You should look into the 42s as well. They flow like 50 on our cars.
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From: East Side Performance! mASShole
Originally Posted by BADSZ28
I would bump up the injectors. I am at 125% NA on the 28s from GM and I am cam only. 30s would probably do for me but I want to go bigger for future plans. You should look into the 42s as well. They flow like 50 on our cars.
i run 42's on my car, and make a little over 450 motor wise and 2 stage wet.
Here is the math for injector sizing, a general base to go by. (this is only good for V8 engines)
Projected hp (crank) x .55 (BSFC) / 6.4 (com denom) = min injector to meet 80% duty cycle
I used your middle ground suspected rwhp from n/a and dry= 525rwhp
Now, I take and add 15% drivtrain loss to get BHP (crank)=603.75bhp
So,
604 x .55 = 332
332 / 6.4 =51.90lb min injector to meet 80% rule
We can see just using your suspected hp middle ground that your pushing the injectors pretty far, and if your off on hp it may be worse.
Here is the math to figure your bhp your 36lb (at our pressure) injectors can safely support.
Known inject size x 6.4 / .55 = hp supported considering the 80% rule
So,
36 x 6.4 = 230.4
230.4 / .55 = 418.9bhp/481.7rwhp safely supported with your injectors.
Once again, shows you are worse than border line or past the safety rule.
Now on the back fire, here's my take. Beause your injectors are border line, I believe that going a tad lean caused your plug to melt (along with a couple other things, octane and timing). Then once the plug debri was flaoting around, a piece was caught in the valve and allowed that clyinder to fire out of sync cause valve was stuck open. That's where the back fire came from, imo.
I run two bottles in my car because I hate the pressure going down during the day, and I am lazy, dual 15lb'ers. Congrats on a new best, you deserve it after putting in all the hard work.
Robert
Projected hp (crank) x .55 (BSFC) / 6.4 (com denom) = min injector to meet 80% duty cycle
I used your middle ground suspected rwhp from n/a and dry= 525rwhp
Now, I take and add 15% drivtrain loss to get BHP (crank)=603.75bhp
So,
604 x .55 = 332
332 / 6.4 =51.90lb min injector to meet 80% rule
We can see just using your suspected hp middle ground that your pushing the injectors pretty far, and if your off on hp it may be worse.
Here is the math to figure your bhp your 36lb (at our pressure) injectors can safely support.
Known inject size x 6.4 / .55 = hp supported considering the 80% rule
So,
36 x 6.4 = 230.4
230.4 / .55 = 418.9bhp/481.7rwhp safely supported with your injectors.
Once again, shows you are worse than border line or past the safety rule.
Now on the back fire, here's my take. Beause your injectors are border line, I believe that going a tad lean caused your plug to melt (along with a couple other things, octane and timing). Then once the plug debri was flaoting around, a piece was caught in the valve and allowed that clyinder to fire out of sync cause valve was stuck open. That's where the back fire came from, imo.
I run two bottles in my car because I hate the pressure going down during the day, and I am lazy, dual 15lb'ers. Congrats on a new best, you deserve it after putting in all the hard work.
Robert
Last edited by Robert56; Jul 25, 2006 at 10:09 PM. Reason: Fix subtracting 15% to adding 15% on drive train loss
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From: Deerfield Beach, FL
Originally Posted by Slow Z28
Devon -
Maybe I missed it, but what is your total shot size. What's the car run on motor then? Just kinda wondering
Maybe I missed it, but what is your total shot size. What's the car run on motor then? Just kinda wondering
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From: Deerfield Beach, FL
Originally Posted by Robert56
Here is the math for injector sizing, a general base to go by. (this is only good for V8 engines)
Projected hp (crank) x .55 (BSFC) / 6.4 (com denom) = min injector to meet 80% duty cycle
I used your middle ground suspected rwhp from n/a and dry= 525rwhp
Now, I take and subtract 15% drivtrain loss to get BHP (crank)=446bhp
So,
446 x .55 = 245.3
245.3 / 6.4 =38.32lb min injector to meet 80%
We can see just using your suspected hp middle ground that your pushing the injectors, and if your off on hp it may be worse.
Here is the math to figure your bhp your 36lb (at our pressure) injectors can safely support.
Known inject size x 6.4 / .55 = hp supported considering the 80% rule
So,
36 x 6.4 = 230.4
230.4 / .55 = 418.9bhp/481.7rwhp safely supported with your injectors.
Once again, shows you are border line or past the safety rule.
Now on the back fire, here's my take. Beause your injectors are border line, I believe that going a tad lean caused your plug to melt (along with a couple other things, octane and timing). Then once the plug debri was flaoting around, a piece was caught in the valve and allowed that clyinder to fire out of sync cause valve was stuck open. That's where the back fire came from, imo.
I run two bottles in my car because I hate the pressure going down during the day, and I am lazy, dual 15lb'ers. Congrats on a new best, you deserve it after putting in all the hard work.
Robert
Projected hp (crank) x .55 (BSFC) / 6.4 (com denom) = min injector to meet 80% duty cycle
I used your middle ground suspected rwhp from n/a and dry= 525rwhp
Now, I take and subtract 15% drivtrain loss to get BHP (crank)=446bhp
So,
446 x .55 = 245.3
245.3 / 6.4 =38.32lb min injector to meet 80%
We can see just using your suspected hp middle ground that your pushing the injectors, and if your off on hp it may be worse.
Here is the math to figure your bhp your 36lb (at our pressure) injectors can safely support.
Known inject size x 6.4 / .55 = hp supported considering the 80% rule
So,
36 x 6.4 = 230.4
230.4 / .55 = 418.9bhp/481.7rwhp safely supported with your injectors.
Once again, shows you are border line or past the safety rule.
Now on the back fire, here's my take. Beause your injectors are border line, I believe that going a tad lean caused your plug to melt (along with a couple other things, octane and timing). Then once the plug debri was flaoting around, a piece was caught in the valve and allowed that clyinder to fire out of sync cause valve was stuck open. That's where the back fire came from, imo.
I run two bottles in my car because I hate the pressure going down during the day, and I am lazy, dual 15lb'ers. Congrats on a new best, you deserve it after putting in all the hard work.
Robert
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From: Deerfield Beach, FL
Also, one other thing, not sure if I mentioned it or not, i'm running #7 plugs, I would go to 8's, but I do still like to drive the car around on the street and as it is I have to get on it to blow the plugs out if I cruise around at low rpm too long. Of course I always put fresh plugs in before I go racing, but i've heard the 8's will foul out like instantly.