Cel???
Should i go to the dyno again and tune with cel on?
Could that help?
Tune the piggyback correctly, and you shouldn't get a CEL. It sounds like you just need to go back and richen it up a bit.
You said it was tuned to a perfect mix on the dyno. Perfect for you doesn't mean perfect for the ECU. It wants a certain AFR, which is probably quite rich. Try tuning in closed-loop for close to that to keep your fuel trims near 100%, and then do some open-loop pulls to see what your AFR is when you put your foot down.
You can't tune the closed-loop operation, the ECU will try to adjust the trims to bring the AFR back to where it wants it. The trims go up to 112%, I think. If it needs more than that, it throws a CEL for system too lean, and your car runs like poop. You can tune your open-loop operation by tuning during closed-loop and affecting the fuel trims.
In other words, in order to get a certain AFR at wide-open throttle, you have to tune the closed-loop (cruising) fuel trims. Want a leaner WOT? Richen up your part-throttle settings. Want richer WOT? Lean out your part-throttle. You probably won't get it perfect in 3 dyno runs. It will change over time, and with changes in weather. You're better off resetting the ECU and keeping an eye on your fuel trims. Program your piggy to keep the fuel trims in the ECU from changing, and THEN start tuning.
Make sense?
You said it was tuned to a perfect mix on the dyno. Perfect for you doesn't mean perfect for the ECU. It wants a certain AFR, which is probably quite rich. Try tuning in closed-loop for close to that to keep your fuel trims near 100%, and then do some open-loop pulls to see what your AFR is when you put your foot down.
You can't tune the closed-loop operation, the ECU will try to adjust the trims to bring the AFR back to where it wants it. The trims go up to 112%, I think. If it needs more than that, it throws a CEL for system too lean, and your car runs like poop. You can tune your open-loop operation by tuning during closed-loop and affecting the fuel trims.
In other words, in order to get a certain AFR at wide-open throttle, you have to tune the closed-loop (cruising) fuel trims. Want a leaner WOT? Richen up your part-throttle settings. Want richer WOT? Lean out your part-throttle. You probably won't get it perfect in 3 dyno runs. It will change over time, and with changes in weather. You're better off resetting the ECU and keeping an eye on your fuel trims. Program your piggy to keep the fuel trims in the ECU from changing, and THEN start tuning.
Make sense?
Last edited by Myszkewicz; Mar 31, 2007 at 08:53 PM.
Tune the piggyback correctly, and you shouldn't get a CEL. It sounds like you just need to go back and richen it up a bit.
You said it was tuned to a perfect mix on the dyno. Perfect for you doesn't mean perfect for the ECU. It wants a certain AFR, which is probably quite rich. Try tuning in closed-loop for close to that to keep your fuel trims near 100%, and then do some open-loop pulls to see what your AFR is when you put your foot down.
You can't tune the closed-loop operation, the ECU will try to adjust the trims to bring the AFR back to where it wants it. The trims go up to 112%, I think. If it needs more than that, it throws a CEL for system too lean, and your car runs like poop. You can tune your open-loop operation by tuning during closed-loop and affecting the fuel trims.
In other words, in order to get a certain AFR at wide-open throttle, you have to tune the closed-loop (cruising) fuel trims. Want a leaner WOT? Richen up your part-throttle settings. Want richer WOT? Lean out your part-throttle. You probably won't get it perfect in 3 dyno runs. It will change over time, and with changes in weather. You're better off resetting the ECU and keeping an eye on your fuel trims. Program your piggy to keep the fuel trims in the ECU from changing, and THEN start tuning.
Make sense?
You said it was tuned to a perfect mix on the dyno. Perfect for you doesn't mean perfect for the ECU. It wants a certain AFR, which is probably quite rich. Try tuning in closed-loop for close to that to keep your fuel trims near 100%, and then do some open-loop pulls to see what your AFR is when you put your foot down.
You can't tune the closed-loop operation, the ECU will try to adjust the trims to bring the AFR back to where it wants it. The trims go up to 112%, I think. If it needs more than that, it throws a CEL for system too lean, and your car runs like poop. You can tune your open-loop operation by tuning during closed-loop and affecting the fuel trims.
In other words, in order to get a certain AFR at wide-open throttle, you have to tune the closed-loop (cruising) fuel trims. Want a leaner WOT? Richen up your part-throttle settings. Want richer WOT? Lean out your part-throttle. You probably won't get it perfect in 3 dyno runs. It will change over time, and with changes in weather. You're better off resetting the ECU and keeping an eye on your fuel trims. Program your piggy to keep the fuel trims in the ECU from changing, and THEN start tuning.
Make sense?
Thanxs for the advise Mysz!!!
Then y this didn't happened to anyone else... that I know. the guy that tune my piggy, tune the piggy to a guy with an RA before me and the RA guy didn't have any problems or CEL problems... I don't get it!!!!
Last edited by qlitv; Apr 1, 2007 at 03:22 PM.
Maybe is because I tune my piggy right after I reset the ecu and then, when it read the codes it whent crazy or something that whent to save mode, thats what happened I think but it doesn't matter im going to the dyno and tell the tuner what you said Myszkewicz and I'm also going to try and tune the ecu with the piggy with out reseting the ecu to see what happens.
and thanks Myszkewicz for the advice!!!
and thanks Myszkewicz for the advice!!!
