Thread: E53 ECU Tuning
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Old 08-07-2019, 10:09 AM
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That's me saying that I would certainly use a tuning service. With my experience tuning a turbo 4 cylinder I would hate to have to try and tune for all the technology in modern BMW's. I had a hard enough time tuning the idle control valve for smooth idle with AC on, AC off, electric fan on, electric fan off, and all combinations. And at any ambient air temperature. I couldn't imagine trying to tune vanos, valvetronic, fly by wire throttle, etc.

Tuning a 4.4i without other mods isn't going to net very much HP under the best of circumstances. Maybe 5-10hp (WAG). But I'd stick to Dinan, Turner, etc to do my tuning for me.
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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