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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 03-15-2014, 09:30 PM
ahdoman ahdoman is offline
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Question Auto Trans adjustment questions

Ref; 1988 325i convertible
So I adjusted the shift down cable linkage (the one on the throttle body) and the downshift points are really good now. But, is there a way to keep the trans in gear to a higher RPM? When I'm on the gas the trans seems to perform just like I would expect it to. But when I'm not it will upshift through the gears fairly quickly and then bog. Is there another adjustment(s) that can be made or is it just the cable from the throttle body and the switch under the go pedal.
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  #2  
Old 03-15-2014, 09:34 PM
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downhiller downhiller is offline
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reprogramming the tcu
putiing in stiffer valve springs
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Last edited by downhiller; 03-15-2014 at 09:36 PM.
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  #3  
Old 03-15-2014, 09:39 PM
ahdoman ahdoman is offline
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How is the TCU reprogrammed? I know the ECU can be rechipped but I was unaware of the TCU.
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  #4  
Old 03-15-2014, 09:47 PM
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downhiller downhiller is offline
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not 100% on how on older cars i do know on newer ones you adjust shift setting with s power programmer. some chips may be able to because the tcu uses engine load to determine when to shift
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Old 03-16-2014, 05:44 AM
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toybuilder toybuilder is offline
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E30's don't use a TCU ,they don't have any computer control of the trans. E46's are the first real comp controlled transmissions in a 3 series E36 traction control is tied to the trans but can't change the shift points. So basically your options are the same as any old school trans torque converter stall speed ,shift kit in the valve body. Probably a cheaper option than trying to mod a BMW auto trans ,swap in a 5sp ,then you can shift it when ever you want to.
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Old 03-16-2014, 07:42 AM
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downhiller downhiller is offline
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so they use the ecu for the trans or do they use the tranny pump pressure for shifting?





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  #7  
Old 03-16-2014, 08:44 AM
ahdoman ahdoman is offline
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Thanks Toybuilder, that's what I thought. The car needs to stay as an auto for two main reasons;
1) I commute with it in LA traffic. A stick really sucks for that.
2) Wife can't grasp the concept of using a stick. She can drive one but she also kills them.
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Old 03-16-2014, 12:04 PM
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toybuilder toybuilder is offline
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Hey DH they use pump pressure and the check balls in the valve body to control the shifting.
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Old 03-16-2014, 12:29 PM
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downhiller downhiller is offline
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i have seen where (on chevy trucks) you can change the springs for the check valves, drill a couple holes and increase the pressures so they shift at a higher rpm. anything option like that on these trannies?


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