12-08-2011, 12:28 AM
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#11 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3596
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Quote:
Originally Posted by ImportConvert
Does the transmission have a temp gauge?
Without an additional oil-cooler for the engine, will the trans, or engine-oil overheat first? (Trying to gauge just how much a cooler for the AT is needed)
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The ECU knows the trans temp, but unfortunately "normal" OBD-II readers can't see it, just Consult at the dealership. If you do overheat the transmission, there's a failsafe where if the temperature (as measured on the 7AT's mini-ECU) see 293F or higher for 2 full minutes, or a single spike to 302F, it goes into a failsafe mode that cuts your throttle position.
I have yet to hear of anyone actually hitting this in the real world, because before you reach that point, the 7AT will start misbehaving due to elevated temps (gets slushier and slower), and you kinda "know" by the feel that it's getting overworked.
The oil cooler is more important by far, and IMHO you never need the 7AT cooler for regular street driving. It's a must for track driving though.
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