I went to enable open loop and then flashed my car. At 96% is failed and retried connections for 20 so times before giving up. Then I went to try again..... no VCM found...... hmmm. Close HP tuners and re open and VCM says recovery in red... it successfully flashes. I went to start the car and well.... It bucks and bucks then runs.... around 10afr... probably my VE tables. So I made some adjustments to make it leaner to the VE table, flash it, would not even start. So, I then proceed to do the 04' stock tune PJ uploaded on the repository, car would start.. i gave it gas... would not get up above 1000 rpm, buck buck die.... I thought I broke the car... seriously. However, i think the engine was pretty flooded at the time.
Well, I flashed my current tune, the tune before i put it in open loop, and it started just fine, runs and drives just fine. My question is...
1) Does a reflash reset the STFT, and LTFT's? Im sure it does...
2) As the VE % increases, the more air, the more fuel needed? <--- yeah Im gonna get it for this one, N000bbbie LOL
Cause I thought the higher the #, the more fuel the injectors put in per cell. It just I read elsewhere that you lower the VE number till you turn "pig" rich.
I am still new to this! I just had these 2 brain farts that i couldn't figure out by searching... Thanks everyone
1) I don't know if LTFTs are reset with a reflash - i've heard either way. STFTs are dynamic and track what the narroband O2 doing - so essentially they reset everytime you start the car
2) For our cars - a higher number in the VE cell makes it richer in that cell.
Maybe you tables are so far off that the car will not run right. If that is the case, I would go out with the tune that works and log some LTFT's for the low and high RPM VE tables - adjust the tables and smooth throughly. Then maybe try some open loop tuning. You want to make sure everything looks smooth because a high AFR error will hurt you more at WOT and high rpms...
oldskool wrote:1) I don't know if LTFTs are reset with a reflash - i've heard either way. STFTs are dynamic and track what the narroband O2 doing - so essentially they reset everytime you start the car
2) For our cars - a higher number in the VE cell makes it richer in that cell.
Maybe you tables are so far off that the car will not run right. If that is the case, I would go out with the tune that works and log some LTFT's for the low and high RPM VE tables - adjust the tables and smooth throughly. Then maybe try some open loop tuning. You want to make sure everything looks smooth because a high AFR error will hurt you more at WOT and high rpms...
Thanks oldskool!!!.... I know I probably asked some common knowledge questions lol, but listening to a few people; I can be quite gullible sometimes, at one point I thought lowering VE would richin, it just did not make since based on how soo many VE tables are mapped out on our cars.
Makes total since about the STFT... why else would it be called short term fuel trim.... LOL I really had a brain fart. I think what added to the problem... dont be nice and let you friends/family borrow your laptop with hptuners on it to fool around with their car, he did sign a disclaimer..
I should of compared the stock file to a recently downloaded one, because he over wrote the file with VE offset at 0%, along with some other things (talking about wasting his credits he bought)!!!! I noticed this last night, needless to say, someone got an ear full.... LOL
Thanks again oldskool, do you have problems flashing sometimes... i read on hptuners forums its a VCM power/grounding issue (i definitely can not use high speed).. take it easy~
fyi fuel trims are disabled in open loop
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
I have yet to have a problem with a read/write not completing and i always use high speed. Can't help you there.
You should be able to find a stock file in the tune repository on the HPT website.
To add to what evilmonkitar said (which is 100% correct), if you are tuning in open loop, you need to adjust fuel based on AFR error %, only use LTFT data from closed loop logs...
