Quote:
Originally Posted by Clockwork
BCred, as for the tune I have from my local ECU programmer, this is what he told me the other day about what they did to my 4.4i with 4.8iS exhaust pipes/mufflers... Our tune stage 1 for BMW 4.4 includes optimized timing using 91 (I use 91 99.9% of time) or 94 octane, sharper throttle, speed limiter off, RPM increased by 250.
If I get the Dinan Stage 2 SW installed, it will overwrite what the local ecu programmer has done, according to him. so I'd loose all that money/tuning.
I also asked a Dinan installer here about tranny software for the facelifted models and he said there is none. It was just for the pre-facelifted models.
I really like the idea of the Dinan tranny software NOT shifting the gears up automatically on you when in manual mode. I agree its a sweeeet safety feature from factory but if you're using full manual mode you should be cognizant of what gear you are in (like a real manual car) anyhow.
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I added paddles to have the most fun in the manual mode.
Since BMW tunes leave so much HP and TQ on the table and our vehicles can advance timing and higher octane allows more advance without spark knock, after market tunes generally take advantage of that opportunity. TQ gets you going and HP keeps you going. A tune improves both the how fast you get going and with the increase of rpm shift points you better advantage of the increased HP so you get from A-B sooner.
The difference in Dinan tunes and ofter aftermarket tunes is that Dinan optimizes the tune to the other Dinan mods. That doesn't mean it produces better results necessarily as it depends on how far other tunes push largely the timing advance. What I would do is find a 4 wheel dyno, book an appointment when it is cool and humidity around 50% and see what you have. I can tell you what you can expect out of the Dinan mods.
I don't like the Dinan prices but since Dinan matches the BMW warranty on new BMWs and BMW does not void the warrantly and Dinan specializes in BMWs, I am very confident in their products.
HP increases take cubic $$$$. Bottom line question is how much HP and TQ would you like or how much money do you want to spend. With that info I can suggest options to consider. As an example, you could add meth injection to boost the octane to the equivalent of 106 octane so you would be sure the knock sensors would never pull back the timing.
Performance Automatic Transmission Software (00-03) - Dinan, Leader in BMW Performance Parts and Upgrades As mentioned in an earlier post, the Dinan website is not always current but it shows transmission software for a 2005 4.4 is available.