VAFC tuning question
05-02-2014, 03:49 AM
#1
VAFC tuning question
I have searched through the performance forums and haven't been able to locate this information, so hopefully someone with a similar setup is feeling nice. I am installing a 00vi with 5th gen injectors. I need to set my fuel corrections to a reasonable level so I can drive to the dyno shop to have it tweaked just right. My question is this: does anyone have a mostly stock vq30de with a 4th gen ecu and 00vi with 5th gen injectors and the willingness to share their fuel correction values so I can get at least close enough to make a 15 mile trip without blowing the motor to peices? I would be very grateful.
05-02-2014, 06:52 AM
#2
You won't be blowing the motor to pieces, 5th gen injectors with a stock 4th gen ECU will make the car run slightly richer while cruising, (though this should be corrected by your o2 sensors) and at WOT it will run very rich (this is not dangerous to the car by any means).
Once you get to the dyno place they can do the tune for max power wide open throttle.
Once you get to the dyno place they can do the tune for max power wide open throttle.
05-02-2014, 03:27 PM
#4
Running rich itself wont, but soaking 200k cats in raw fuel for 20 minutes certainly isn't good. "Blowing it to pieces" is an exaggeration of course, but id still like the correction values. If you don't have them or are not willing to share, please don't clutter my thread. Thanks.
05-02-2014, 07:34 PM
#5
You won't be blowing the motor to pieces, 5th gen injectors with a stock 4th gen ECU will make the car run slightly richer while cruising, (though this should be corrected by your o2 sensors) and at WOT it will run very rich (this is not dangerous to the car by any means).
Once you get to the dyno place they can do the tune for max power wide open throttle.
Once you get to the dyno place they can do the tune for max power wide open throttle.
OP, just drive the car to the dyno and keep your foot out of the throttle if you're so concerned about your cats.
If you had a wideband, you could actually verify that your ECU is doing a good job of maintaining stoich mixtures in closed loop, and not soaking the cats in raw fuel as you are inclined to believe.
05-02-2014, 11:34 PM
#6
OP, just drive the car to the dyno and keep your foot out of the throttle if you're so concerned about your cats.
If you had a wideband, you could actually verify that your ECU is doing a good job of maintaining stoich mixtures in closed loop, and not soaking the cats in raw fuel as you are inclined to believe.
If you had a wideband, you could actually verify that your ECU is doing a good job of maintaining stoich mixtures in closed loop, and not soaking the cats in raw fuel as you are inclined to believe.
If I dont find one prior to installing this setup I always have access to a consult to at least read the regular O2's in line graph mode (perks of being a dealer technician) I know that it will probably be ok, hell I drove it the rest of the way to work after one of the spark plugs blew out. If I have the option of minimizing damage to the car then I want to do it. I will make this easy. I know I can drive the car. I know that the engine won't blow up. I am looking for someone with a similar setup that wouldn't mind taking a few mins out of their day to share their correction values. If your only advice is just to drive it anyways, move on. I didn't ask whether it was safe to drive or not, I asked for correction values. I probably could have found this information in a search but threads of a technical nature tend to go way off topic when people do stuff like this, which based on my reading so far is most of the time.
05-03-2014, 08:11 AM
#7
I have been running 5th gen injectors in my 4th gen max with 4th gen ecu for like 8 years, untuned. I know it runs rich and I stay off the throttle mostly because its a huge waste of fuel. Id like to tune but even untuned I get high 20's mpg's when I drive it right. Gas mileage is terribly awful if I do much/any WOT runs.
08-07-2014, 11:21 AM
#11
Been running 00vi untuned on my 99 for over a year now as well, and I get decent mileage...I have an emu and I just now finished a harness (95 ecu) for the emu. I am a bit hesitant to use the emu I have no experience with it bu using the dandymax writeup has been a great aid. So I will probably either install it soon, or sell it.
But OP it's ok to run rich if you don't mind a little less mpg.
But OP it's ok to run rich if you don't mind a little less mpg.
09-13-2014, 09:33 AM
#12
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