Rtek Forum Discuss the Rtek 2.0 and other Rtek ECU's

Auto-tuning possible?

Old 04-26-06, 08:10 AM
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Auto-tuning possible?

I"ve always wondered this, but don't know if it's even possible. Would there be someway to incorporate into the software to "auto-tune" the car. Say if you fed it a WBo2 reading...that it could take that...and adjust your maps to change to compensate for a set air/fuel ratio? I've always wondered this...just curious really. If so, is this something that would be possible in the future with the rtek 2.0. I just purchased my 2.0, but I had to sell my PDA, as the zire 72 doesn't work with the setup and I've got a tungsten t2 on the way to me.
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Old 04-26-06, 06:21 PM
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Sure it's possible. I'm pretty sure there are a couple of stand alones that have this ability. They run in closed loop all the time, even under high loads, which is not something normally done. Not sure if the stock ECU is up for the extra processing load. I'll let Henrik chime in.

We may build in something like this into the software. It wouldn't be realtime automatic adjustment, but it would provide a simple interface that can be used to easily see what needs adjustment.
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Old 04-26-06, 08:51 PM
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yea...that would be very cool...even if it wasn't "real time"...it would at least give us n00b tuners that are scared to blow up their motors, at least a good idea of what needs to be altered. I'd get the car tuned professionlly...but there is NOBODY in eastern NC that I know, that tunes 7's.
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Old 04-27-06, 01:04 AM
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See that's one of the cool things with the Rtek is that it comes with a
great baseline map and with the AFM this map will work well for most
vehicles. Autotune is much more usefull in a MAP based system where
the ECU has to be told (or learn) the VE of the engine.

As part of the development for the AFM removal feature (will apear
first in the Rtek 2.0 for S4NA's), I've been toying with writing an
autotune helper utility for generating maps. This would run in an
offline mode.

-Henrik
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Old 04-27-06, 10:14 AM
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sweet...that's good to hear. I'm waiting for my palm t2 to get here so I can start playing with my 2.0. I have a couple questions for you....I have an 88tII with a streetported motor, 550/750 injectors. I'm running about 12lbs boost on an s5 turbo. Should I lower the crossover point for the secondaries? If so...what should I adjust it to?

Secondly, what are safe afr's? I have an innovate WB and gauge. Sitting in neutral and revving the car...it idles at about 12-13:1...if I run up the rpms quickly...it'll jump to 15-16 for a second...is that about right for no load/no boost? What afr's should I be seeing under full boost? As I said...i'm new to tuning, so I'm gonna be relying pretty heavy at first on the basemap of this 2.0...heh.
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Old 04-30-06, 11:52 PM
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Set it to 3500rpm or so. For AFR's, there's a number of good threads
on what AFR's you should target, search a bit. The base map (stock)
should give you a rich/safe tune.

-Henrik
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Old 05-01-06, 10:45 AM
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you should tune for around 11's or richer at WOT. you can go 11.5, but for a street car thats kinda pushing it. get some water injection and youd be a happy camper.

your idle afr's seem to be fine. . . hell, i wish i could get MINE to do that. my car sits at about 11.0:1 at idle. . . but i have 850cc primaries
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Old 05-01-06, 11:13 AM
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The AEM will auto tune... once the timing is set... you tell it the A/F's you want throughout the rpm band. You start with low boost and high octane and do a pull - it will get very very close to your targets. Once it dials itself in - you up the boost... then it is tuned. You then turn off the feedback for the upper rpms and let it stay in "closed loop" for driveability in vacuum / low rpm conditions.

This is how my supra was tuned and it worked amazingly well. A couple of pulls and the WOT tuning was done. The timing is a different matter - but I'm sure you can get some conservative timing maps to start with.

Good luck.
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