Road tuning with OFT

[BuBlake]

Edit: Did some skimming of the logs prior to scaling and the new logs after scaling and came to a conclusion: Now instead of being pegged at 11.25 from 3500rpm wot and up, now it's only pegged at 11.25 above 5800rpm wot! This is a very noticeable improvement in the logs. I could swear my butt dyno picked up a few hp, but I'm a skeptic.

Also found that the new scaling in the VGI utility wants a lower mass flow per volt above around 3v this time, not 2.5. It is indeed slowly correcting the maf curve log by log. I believe it cannot make a full correction all at once simply because my AFR is off the charts rich for the stock 02.(stock 02 is blind below 11.25:1 with OFT maps, probably for good reason) If I had a wideband 02, the VGI scaling utility could probably see exactly how much it was off and pull off a near perfect correction with one log.

[ray7792]

Originally Posted by BuBlake

Edit: Did some skimming of the logs prior to scaling and the new logs after scaling and came to a conclusion: Now instead of being pegged at 11.25 from 3500rpm wot and up, now it's only pegged at 11.25 above 5800rpm wot! This is a very noticeable improvement in the logs. I could swear my butt dyno picked up a few hp, but I'm a skeptic.

Also found that the new scaling in the VGI utility wants a lower mass flow per volt above around 3v this time, not 2.5. It is indeed slowly correcting the maf curve log by log. I believe it cannot make a full correction all at once simply because my AFR is off the charts rich for the stock 02.(stock 02 is blind below 11.25:1 with OFT maps, probably for good reason) If I had a wideband 02, the VGI scaling utility could probably see exactly how much it was off and pull off a near perfect correction with one log.

I'm dealing with the same thing cause of the FA20club CAI T.T
Quick question...I'm currently collecting logs for my first new scale. Should I just keep building up data using my current tune or should I reflash everytime VGI utility rescales the MAF then get logs with the new scale to be put into the VGI utility? I'm guessing you are doing the latter as the stock O2 isn't good enough?

I started out by using the Perrin 2.75in scale hehe, it leaned out the AFR a bit, but after 4.5k-5k RPM it goes back to 11.25 =/

[BuBlake]

Originally Posted by ray7792

I'm dealing with the same thing cause of the FA20club CAI T.T
Quick question...I'm currently collecting logs for my first new scale. Should I just keep building up data using my current tune or should I reflash everytime VGI utility rescales the MAF then get logs with the new scale to be put into the VGI utility? I'm guessing you are doing the latter as the stock O2 isn't good enough?

I started out by using the Perrin 2.75in scale hehe, it leaned out the AFR a bit, but after 4.5k-5k RPM it goes back to 11.25 =/

Yes, I will be rescaling with the VGI utility every time I reflash until it no longer needs a correction. The reason that it cannot correct with one datalog when we're pegged at 11.25:1 is that we could really be much richer. This means that it only corrects for 11.25 and not 10:1 or whatever our overly rich AFR really is, resulting in a correction that is heading in the right direction, but not 100% there yet. With each flash our goal is to be leaning closer to 11.25:1 and eventually our actual target AFR's. Just keep running logs of the new flashes until it reaches targets!

[steve99]

Originally Posted by BuBlake

Yes, I will be rescaling with the VGI utility every time I reflash until it no longer needs a correction. The reason that it cannot correct with one datalog when we're pegged at 11.25:1 is that we could really be much richer. This means that it only corrects for 11.25 and not 10:1 or whatever our overly rich AFR really is, resulting in a correction that is heading in the right direction, but not 100% there yet. With each flash our goal is to be leaning closer to 11.25:1 and eventually our actual target AFR's. Just keep running logs of the new flashes until it reaches targets!

If you have an oft you can also monitor the second O2 sensor which is more "wideband" than the front O2 sensor. Do this by looking at the "Wideband AFR" parameter. It calibrated for an Bosch Wideband o2 sensor (LSU4.2) and its after cat if you look at that reading on it will give you an indication of the direction your heading with afr. when the front O2 is at the limit of its narrow range

Use the front O2 for your calculations its good enough for NA stuff just no good once it gets outside its narrow range so no good for FI.

[Wayno]

If we buy an AEM will it just plug in and work without the extra controller, etc?

[steve99]

Originally Posted by Wayno

If we buy an AEM will it just plug in and work without the extra controller, etc?

Best ask shiv but I seem to recall you needed controller as well

sorry @Wayno stuffed up its calibrated for a Bosch Wideband o2 sensor (LSU4.2) & controller

http://www.ft86club.com/forums/showthread.php?t=61724

[BuBlake]

Just went out for a test drive with the latest scale(this is my 3rd rescale using VGI) and holy crap, it feels just as fast as it did on E85 with 93 now!! Checked the logs and it is never pegged at 11.25... Never! 11.6:1 at 7400rpm! It is ever so slightly on the rich side of the targets(11.6 measured when 12:1 commanded). I'm tempted to just leave it there and swap the scale over to an E85 map and see what happens, but now I want to see if I can get it nailed first. Finally I feel the full potential of OFT! Thank you! Thank you! Thank you!

Ran a 14.7 quarter on e85 last time at drag strip when pegged at 11.25 anywhere above 3k, so will be interesting to see the numbers next time I go... First just need some new tires. :/

[Wayno]

Originally Posted by steve99

Best ask shiv but I seem to recall you needed controller as well

sorry @Wayno stuffed up its calibrated for a Bosch Wideband o2 sensor (LSU4.2) & controller

http://www.ft86club.com/forums/showthread.php?t=61724

Yeah the same bosch is used by the aem kit i would think.

[BuBlake]

http://www.datazap.me/u/tuner1b/pret...s?log=0&data=1

4th scale and I'm content. I think <2v may be off a bit, but it's right on target when under WOT at any RPM. If I didn't know any better, I would have thought someone slapped an electric supercharger on my car or something because it is much, much snappier. Can't wait to try this scale with an OFT E85 stg 2 tune now. Thank you @steve99 and @Kodename47 for the great support. I was too stubborn to learn this on my own. haha

[Wepeel]

Originally Posted by Wepeel

It was just a little different - mine seemed to peg 11.25 as it crossed 5k RPM at full load, but seemed to be mostly close to targets before that at most loads in OL or CL. I think with more driving it's gotten a little better, takes longer to hit 11.25, but it still gets there.

I have since added a Berk HFC and am replacing the Borla with an OFH. I noticed the Borla was showing leaks at all 3 flanges - I'm sure that was not helping the AFR, but not sure how much of an effect it would have. Hopefully with the OFH it will make things better - obviously the OFT is tuned specifically for it and from what I've seen it flows better than the Borla at higher RPM.

Just to follow up, I've since installed the OFH and AFR is pretty much right on target.