Looking For Dinan E53 X5 CAI: D760-0534

[Clockwork]

Originally Posted by bcredliner

Per 2002 Dinan Catalog the cold air intake system added 13 bhp at 5,700 rpms and 12 lb/ft. of torque at 5,700 rpms. It doesn't go away so you either are accustomed to the gain or something else is happening. There is no adaption that will compromise the tune though the ECU is always adapting the transmission to driving style. You could be driving less aggressively than when you first installed the tune.

Dinan tunes are historically on the conservative side though they are designed to match to Dinan Mods. I suggest adding the Dinan transmission software rather than Dinan Stage 2 tune since you already have a tune. The transmission software makes a big difference and is well worth the cost. It changes the shift points so you benefit more from what you got out of the cold air addition, it speeds up the shifts and makes them firmer. All benefits are especially noticeably in either manual mode. If you are in the full manual mode where you have to shift the transmission it will stay in the gear you select until you shift.

More air means more air out. There will be benefit from lower back pressure mufflers and a better sound comes with them.

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.