OFT - Control Minimum RPMs?
 

I recently had my JDL header installed, and flashed to a stage 2 tune with OFT. On my first test drive, when I stopped at a red light the RPM's went pretty low (~400 RPM) and the engine seemed to bog down and stutter for a second (CEL briefly flashed). It got better with time though, perhaps the engine learning? Either way I figured that I would just edit the minimum idle rev tables in RomRaider. Now the car idles just a bit higher like it should, but only after it first dips down to 500 RPM when I brake to completely stop at a red light, or in the time between going from engaging the brakes at a stop to engaging the throttle. I haven't logged anything yet but that's the next step. I figured some/most of you may have already dealt with a similar situation. Thank you for the input!

TL;DR - within RomRaider can I edit table values so that the RPMs never drop below ~700 RPM?

Its normal for the car to have a low idle after a flash The ecu needs a few miles after every flash to recalibrate itself, the same thing happens when you unplug the battery and reconnect it. Should be normal and more fun with the stage 2 tunes very soon!

Cheers,
-Greg

I have been having this issue come up periodically even after putting hundreds of miles on the car after the flash. I'm running a Tomei UEL header with full catless exhaust on the OFT stage 2 e85 tune. Probably every 3 days it seems my car has trouble finding its idle. While monitoring with the OFT I see that the AFR seems to hunt around going up to mid 15s then jumps down to 13s which is where the car seems to bog down and almost stall sometimes turning off the headlights. I can't seem to find any reason as to why it happens though.

Huh that seems similar to what I'm seeing, although not that extreme...odd.

OFT - Control Minimum RPMs?
 

I have a similar condition. When I clutch in and decelerate to a stop (AFR goes to 15 as rpms drop from ~3000) the rpms drop too much and have to bounce back up to find the idle spot. It doesn't happen all the time and I usually can tell by the excess vibration in the gear lever.


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Mine does this as well. I forgot to mention it but I'd say it happens every once in a while but when it does it will do it almost every time I come to a stop until I park and turn the car off for a while.

I just wish there was a way to program in a soft stop that says don't let the RPM's dip below some set point. Is this possible?

I don't believe so. The ecu is already told to not let the engine go below the idle point by the tune. If yours is anything like mine with the afr changing then it seems to be more of a problem with keeping a steady afr at idle and it adjusts to compensate resulting in the rpm dip.

This is what the idle should be like. There's nothing that can be done.... Except to improve the idle settings.

Is this a common problem with the OFT tunes? I thought I remembered reading that the tune was supposed to help with the idle problems that existed on the stock tune.

I'm pretty sure that all it does is raise the minimum RPM setpoint.

My idle was a disaster on the stock tune. Idle on OFT is much better, but not quite perfect.


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Mine stalled several times before learning phase is completed.
From the next drive, everything is ok.

I'm going to edit the PI/DI ratio tables under idle conditions as per this post and see if it helps: http://www.ft86club.com/forums/showp...6&postcount=21.

Curious, how long does a "learning phase" take anyways?