I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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1. If you want to change your automatic transmission's behaviour, the best thing to do actually would be to buy the Dinan transmission software. Engine software has nothing to do with transmission software.
2. Yes, people who make claims larger than 10-15 horsepower on software alone are lying. Usually it takes software, cold air intake, and maybe even exhaust to get 15 hp.
3. If you've waited 150,000 miles to get that transmission serviced, it's probably too late unless basically ALL your miles are highway miles. "Lifetime" fluid lasts for the BMW "lifetime," which is 100K miles. Really it should be changed every 35-40K.
4. Don't forget changing differential fluid too, that should also be done every 35K-40K miles.
1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.