Very Luck today @ the track
Thread Starter
Safety Car
Joined: Feb 2008
Posts: 3,712
Likes: 3
From: TEXOMA
St. Jude Donor '08-'09
Very Luck today @ the track
went to the track today 1/8th mile to do some practicing an some safe tuning.
well first run a/f was good,
next run i noticed the afr was a little lean 5%, so i added tuned the maf a little bit,
next run it was lean by 15% runing almost 1 lambda at WOT at redline!!! AHHHH i almost sh*t myself when i opend the scan,
the 1/8th mile is soo short that i have NO time to look over at the afr gauge during the run.
i think the only thing that saved me was that i hadn't tuned spark yet and was only runing 3.5 degrees of timing.
and look! the only knock i got is in 1st gear from a little wheel hop.
phew, i need a beer!
i suspect ANOTHER bad Hopps switch, or the KB BAP bad
-Carl
well first run a/f was good,
next run i noticed the afr was a little lean 5%, so i added tuned the maf a little bit,
next run it was lean by 15% runing almost 1 lambda at WOT at redline!!! AHHHH i almost sh*t myself when i opend the scan,
the 1/8th mile is soo short that i have NO time to look over at the afr gauge during the run.
i think the only thing that saved me was that i hadn't tuned spark yet and was only runing 3.5 degrees of timing.
and look! the only knock i got is in 1st gear from a little wheel hop.
phew, i need a beer!
i suspect ANOTHER bad Hopps switch, or the KB BAP bad
-Carl
Last edited by carlrx7; Apr 18, 2010 at 12:49 AM.
Thread Starter
Safety Car
Joined: Feb 2008
Posts: 3,712
Likes: 3
From: TEXOMA
St. Jude Donor '08-'09
SD60's for injectors, with A&A Si kit.
the injector duty cycle is up, because i told the computer add a bunch of fuel, because last pass was lean.
its a fuel pressure issue, injectors are usually in the low 80's
the injector duty cycle is up, because i told the computer add a bunch of fuel, because last pass was lean.
its a fuel pressure issue, injectors are usually in the low 80's
Safety Car
Joined: Aug 2006
Posts: 4,347
Likes: 25
From: Apache Junction AZ
Racer
Joined: Mar 2006
Posts: 281
Likes: 4
From: Houston TX
Are you commanding 3.5deg of timing? Something is wrong. Your timing is all over the place.. 3.5deg of total timing won't burn a damn thing... and your wideband is showing the overall AFR of the car. When you have rich unburnt fuel, it will sometimes read dead lean. When people say start low with timing doesn't mean start at 0!
Generally, something in the low teens (12-14deg) is a safe bet to start. Do a street 3rd gear pull to make sure you get no KR. Adjust AFR. When AFR is dead on play with the timing and make minor AFR adjustments along the way.
Trapping 104 I'm assuming your car has a blower on it.
Generally, something in the low teens (12-14deg) is a safe bet to start. Do a street 3rd gear pull to make sure you get no KR. Adjust AFR. When AFR is dead on play with the timing and make minor AFR adjustments along the way.
Trapping 104 I'm assuming your car has a blower on it.
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Thread Starter
Safety Car
Joined: Feb 2008
Posts: 3,712
Likes: 3
From: TEXOMA
St. Jude Donor '08-'09
80's = duty cycle
the reason the timing is soo low right there is because the IAT's and the IAT table is taking away lots of timing. previous run with spot on fuel only had 6 degrees of timing.
thanks, but i figured out the problem, heat soaked
i was popping the hood, only unlatching it, and all the heat from the motor was going past the hobbs switch, which overheated it,
going to goto a twin 255 tank setup since the A1000 wont be out until fall i think
first run with no traction in first gear,
the reason the timing is soo low right there is because the IAT's and the IAT table is taking away lots of timing. previous run with spot on fuel only had 6 degrees of timing.
thanks, but i figured out the problem, heat soaked
i was popping the hood, only unlatching it, and all the heat from the motor was going past the hobbs switch, which overheated it,
going to goto a twin 255 tank setup since the A1000 wont be out until fall i think
first run with no traction in first gear,
Last edited by carlrx7; Apr 22, 2010 at 06:10 PM.
j/k What was the temp out on that run?