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Old 07-31-2022, 11:26 AM   #1
740atl
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Default microsquirt trans tuning advice/experience for a newb?

Preliminaries... I have a 4r70w from a 2000 v6 stang installed behind a 302w in a 242. The engine is currently being controlled by a megasquirt 2 extra system.

drumroll.. sitting next to the car is an uninstalled microsquirt v3 whose purpose in life is to control said 4r70w.

I'm hopeful to have it wired up in the next week but I have never "tuned" a transmission before.

Anyone out there have relevant transmission tuning experience? I'm looking at the tunerstudio configuration page now and there's quite a few blank windows. I downloaded someone else's tune file from msextraforums but still have questions...

The Questions
  1. How do I go about setting up a shift curve? Just copy/paste what someone else has and roll with it?
  2. How do I know what line pressure curve that the transmission needs? This is a mostly street car (maybe 250hp) that will very rarely see the strip.
  3. What are recommended lockup settings for the converter?
  4. I get tuning air fuel ratios and VE bins, but what exactly am I looking for when I am logging data from the microsquirt?

I suppose I'll have more questions once the thing is running but any pointers/advice beforehand will be appreciated.
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Old 08-02-2022, 07:40 AM   #2
linuxman51
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it's a lot more feel in this case than science as it is with an engine. with line pressure, until you can get definitive data from someone about that specific model of transmission, I'd leave it on the high side but not so high that part throttle shifts are violent (here comes the feel part lol).
As far as when to shift at what throttle position vs speed, feel.

lockup? if the converter clutch is stout and you've got enough line pressure in it (start high and work backwards, not the other way around), you can probably leave it locked up in higher gears to 60-70% throttle. Unless you know for sure, I wouldn't leave it locked up at WOT (or, work your way up to that point)

since you can link the two ecu's via CAN, set up a timing retard on shift if ms2 supports this, and make sure it's active long enough to cover the entire shift. should be able to determine that with data logs.
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Old 08-02-2022, 05:00 PM   #3
740atl
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Awesome! Thanks Kenny! Looking forward to getting it running.
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Old 08-07-2022, 03:07 PM   #4
WillettRun?
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does anyone know if there's any math/log channels for slip? this would be useful for line pressure adjustment
does the ms2 trans software calculate trans input RPM from engine rpm and do you have some sort of driveshaft or wheelspeed sensor? does the 4r have a converter tooth sensor like the 4l80 and so on
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Old 08-07-2022, 03:21 PM   #5
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I don't know off hand if they have a slip % to pressure table (it's been a while since I've updated or even looked at mine), but it will log the slip difference.
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