optimum a/f mixture
02-18-03, 06:04 PM
#1
smog nazi destroyer
Thread Starter
optimum a/f mixture
this weekend i am going to try and get my car back on the dyno to tune my mikuni (44phh)..
what is the optimum air/fuel mixture that i should be shooting for?
this is on a 6-pot 13b.
what is the optimum air/fuel mixture that i should be shooting for?
this is on a 6-pot 13b.
02-18-03, 06:14 PM
#2
Re: optimum a/f mixture
Originally posted by riffraff
this weekend i am going to try and get my car back on the dyno to tune my mikuni (44phh)..
what is the optimum air/fuel mixture that i should be shooting for?
this is on a 6-pot 13b.
this weekend i am going to try and get my car back on the dyno to tune my mikuni (44phh)..
what is the optimum air/fuel mixture that i should be shooting for?
this is on a 6-pot 13b.
02-18-03, 06:16 PM
#3
Does the air/fuel mixture stay constant through the RPM range? Or will it run rich at an idle and lean out as the RPMs increase (thats what my cousins 3rd gen does accoriding to his A/F gauge)? I dont really get all that jazz yet...But I need to learn 
What do the ratios mean also?
~T.J.
What do the ratios mean also?~T.J.
02-18-03, 09:23 PM
#6
Airflow is my life
Just my $0.02. Nikkis tend to go rich at hi rpms. Its in the design. So if you rejet to fix this you can end up dangerously lean at mid range RPM. Tread cautiously.
02-19-03, 10:30 AM
#7
smog nazi destroyer
Thread Starter
coincidentially, sevens only is where i get my car dyno'd.
i brought it there last weekend , but they didnot have any jets for mikuni's so i will bring it back this weekend when i get some..
the strange thing is that their wideband o2 was acting a little weird.. my car is running rich as hell. i get 10 miles to the gallon right now, the exhaust reaks of gas, when my a/f guage was set up it was reading rich as hell (i need to weld a bung into the headers that i am using now to hook that up again), and the current jets in there are what we use around here for p-port 12a's that run at wide open throttle.. anyways, i put it on the dyno, and the wideband said that my a/f was between 14 and 15...
???? that cannot be right????
edit.. i pulled off my old headers to change them this weekend. the insides were black. another sign of running rich as hell.. the o2 sensor was black as well..
i brought it there last weekend , but they didnot have any jets for mikuni's so i will bring it back this weekend when i get some..
the strange thing is that their wideband o2 was acting a little weird.. my car is running rich as hell. i get 10 miles to the gallon right now, the exhaust reaks of gas, when my a/f guage was set up it was reading rich as hell (i need to weld a bung into the headers that i am using now to hook that up again), and the current jets in there are what we use around here for p-port 12a's that run at wide open throttle.. anyways, i put it on the dyno, and the wideband said that my a/f was between 14 and 15...
???? that cannot be right????
edit.. i pulled off my old headers to change them this weekend. the insides were black. another sign of running rich as hell.. the o2 sensor was black as well..
Last edited by riffraff; 02-19-03 at 10:36 AM.
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02-25-03, 04:44 PM
#8
smog nazi destroyer
Thread Starter
after tuning the carb (going through what jets i had around) i ended up with an a/f ration of about 12.7
what do you think of that. close enough? or should i [can i] try for better.
i am now running 200 main ful jets and 200 main jets.
any suggestions (if an adjustment is necessary) are always appreciated.
what do you think of that. close enough? or should i [can i] try for better.
i am now running 200 main ful jets and 200 main jets.
any suggestions (if an adjustment is necessary) are always appreciated.
Last edited by riffraff; 02-25-03 at 04:47 PM.
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