Lean condition or not enough octane?
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TECH Junkie
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From: Deerfield Beach, FL
Lean condition or not enough octane? Launched, got a killer 60', hit 2nd right at the shift light and then just before the 330 mark, she starts breakin up and I let off. Went back and pulled the plugs, and ate up the strap on the first plug on the drivers side and all the others were fine. I was thinking not enough octane (104 with a 300 shot on 11.5/1 compression and had 22 degrees timing in it), but i've been told, "Its NOT an octane problem thats gonna get you all of a sudden in the middle of a run. Most likely a lean condition." So what do you guys think? And I would think if it was from the lean spike from the initial hit it would've started breaking up before I got too the 330 mark. My laptop broke so I wasn't able to have autotap on it too keep an eye on the o2's, so I have no idea if it was goin lean or not, but no changes from the tune when I put it on the dyno and on the dyno after the initial lean spike it went too 10.1:1 a/f.
Thanks for any help guys, really appreciate it!
Thanks for any help guys, really appreciate it!
I think it could be either or. Had you used c16 or better...you likely would not have burned a plug. If you had 10 to 1 on the dyno thats great. But it would be nice to know for certain that your fuel system kept up for the entire run when the plug burning occured.
I would however step up to some real octane.
Then start datalogging eithe Af or fuel pressure or atleast start reading plugs more often.
I would however step up to some real octane.
Then start datalogging eithe Af or fuel pressure or atleast start reading plugs more often.
Devon you should know that an o2 sensor running on spiked gas or leaded race fuel is not accurate .I think you have a fuel starvation problem the farther you go worse it gets . I think your crazy to spray that much thru the manifold your gonna have major distribution problems .I know you have heard it before but you need a fogger so you can tune every cylinder individually and not have distribution issues get a dedicated fuel system for nitrous then you can let that thing eat 
.
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TECH Junkie
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From: Deerfield Beach, FL
Originally Posted by 383LQ4SS
I think it could be either or. Had you used c16 or better...you likely would not have burned a plug. If you had 10 to 1 on the dyno thats great. But it would be nice to know for certain that your fuel system kept up for the entire run when the plug burning occured.
I would however step up to some real octane.
Then start datalogging eithe Af or fuel pressure or atleast start reading plugs more often.
I would however step up to some real octane.
Then start datalogging eithe Af or fuel pressure or atleast start reading plugs more often.
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TECH Junkie
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From: Deerfield Beach, FL
Originally Posted by 383LQ4SS
A stand alone would be nice to have.
Whats fuel system are you running right now?
Whats fuel system are you running right now?
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Thread Starter
TECH Junkie
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From: Deerfield Beach, FL
Originally Posted by laz
Devon you should know that an o2 sensor running on spiked gas or leaded race fuel is not accurate .I think you have a fuel starvation problem the farther you go worse it gets . I think your crazy to spray that much thru the manifold your gonna have major distribution problems .I know you have heard it before but you need a fogger so you can tune every cylinder individually and not have distribution issues get a dedicated fuel system for nitrous then you can let that thing eat .
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From: Deerfield Beach, FL
Originally Posted by 383LQ4SS
whats your total HP? You should be amking 450+ on motor and spraying a 300...lol...your walking a fine line there buddy!
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From: Deerfield Beach, FL
Originally Posted by 383LQ4SS
you may well be running out of fuel. A boost a pump should give another 100-150 hp worth of room.
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From: Deerfield Beach, FL
Originally Posted by 383LQ4SS
713 to the wheels through the TH400...LOL. I think you need more fuel pump.
Your making some good power man!
Your making some good power man!
Not necessarily. I bet your dyno was over rather quickly
If you had the resorces a stand alone fuel tank really would be the way to go. That way you could put c16 or NOS 117 in the front tank and continue with 104 in the main tank.
If you had the resorces a stand alone fuel tank really would be the way to go. That way you could put c16 or NOS 117 in the front tank and continue with 104 in the main tank.
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From: Deerfield Beach, FL
Originally Posted by 383LQ4SS
Not necessarily. I bet your dyno was over rather quickly
If you had the resorces a stand alone fuel tank really would be the way to go. That way you could put c16 or NOS 117 in the front tank and continue with 104 in the main tank.
If you had the resorces a stand alone fuel tank really would be the way to go. That way you could put c16 or NOS 117 in the front tank and continue with 104 in the main tank.
Originally Posted by Loudmouth LS1
Launched, got a killer 60', hit 2nd right at the shift light and then just before the 330 mark, she starts breakin up and I let off. Went back and pulled the plugs, and ate up the strap on the first plug on the drivers side and all the others were fine. I was thinking not enough octane (104 with a 300 shot on 11.5/1 compression and had 22 degrees timing in it), but i've been told, "Its NOT an octane problem thats gonna get you all of a sudden in the middle of a run. Most likely a lean condition." So what do you guys think? And I would think if it was from the lean spike from the initial hit it would've started breaking up before I got too the 330 mark. My laptop broke so I wasn't able to have autotap on it too keep an eye on the o2's, so I have no idea if it was goin lean or not, but no changes from the tune when I put it on the dyno and on the dyno after the initial lean spike it went too 10.1:1 a/f.
Thanks for any help guys, really appreciate it!
Thanks for any help guys, really appreciate it!
Just get the stand alone system. When I would dyno on both kits every thing looked good, but at the track the fpss would shut down the spray at the 1/8. With the stand alone I have had no problems at all.