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Old 08-17-2009, 02:37 PM   #1
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T5 ecu question

Does it matter if I pick up an ecu from a 1999 9-3 that was manual to put in my 1999 9-3 auto?
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Old 08-17-2009, 09:30 PM   #2
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Are you picking it up in order to tune it or want to put it directly into your car??

If to tune it, then that is perfectly fine! Just hit the firmware button and check "automatic trans"

If you want to put it directly into your car... I dont think so, I mean maybe I am wrong, but I know that is an option in t5-suite, so I dont think it will work without clicking the little check box, maybe someone else will know better than me though!
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Old 08-17-2009, 09:45 PM   #3
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Just buy my ecu
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Old 08-18-2009, 05:39 AM   #4
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I was under the impression that it would work. I also believe that they held both maps for Auto/Manual but I could be mistaken. Any reason you were going to do this? If it's for tuning, I would just have the manual one tuned to be sure that it's setup for your autobox.
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Old 08-18-2009, 05:43 AM   #5
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I didn't know if i could swap out the ecu that is in an auto to put in and drive a manual?
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Old 08-18-2009, 06:24 AM   #6
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Sure you can do it, but from what I have read, an auto has dif. maps then a manual.

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Old 08-18-2009, 06:44 AM   #7
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different as in blow the engine different or different as in poor gas milage or idle issues
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Old 08-18-2009, 06:51 AM   #8
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It will be fine. The stock manual maps are no more aggressive than say a stage 1-2 auto map. The boxes have both maps on there, it's just a firmware setting. The car may even adapt to the gearbox type, someone with more auto experience could chime in....I've only dealt with manuals. Just go easy on your slushbox.

If you want to put an auto ECU into a manual, that will work fine too...it will just have a little less boost in all gears.
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Old 08-18-2009, 07:13 AM   #9
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that's what i wanted to know. A guy wants to buy my auto ecu to put in his manual
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Old 08-18-2009, 07:32 AM   #10
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Then what is the significance of the checkbox in the firmware settings?

(I am not denying that the ecus are already programed for both, I just figured that setting was there for some reason)

The guys on ecuproject would def know.
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Old 08-18-2009, 07:43 AM   #11
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I think it just tells the ECU what boost maps to run on. Auto or the manual ones.
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Old 08-18-2009, 07:43 AM   #12
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The checkbox IS important. If auto is checked, the car looks for the auto maps, if not, it uses the manual maps. Using a staged manual ECU on an auto would be a no-no, but for totally stock boxes or going for a staged auto box on a manual isn't so bad. Not optimal, but not terrible.
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