Quote:
Originally Posted by robbiec
This has the potential to be an awesome discussion! Would love to hear from both tuners exactly what parameters they can tweak, such as Air/Fuel, Ignition Timing, Valve Lift, Valve Overlap, Throttle Mapping. Would also love to hear what is different in the programming between 330 vs 328 vs 325. We know the displacement, bore, stroke, heads, cams, and compression ratio are all the same for all three N52 cars. What is different inside the ECU?!
Never saw that Youtube video before. That is a nice dyno graph for a stock 328. Can a 325 see the same peak numbers? If not, why?
|
Some of the things we change are:
AFR's
Throttle response
Valve Lift/Drop for Intake/exhaust
and Timing
Timing is where most power is to be had, and We have played with some VERY aggressive timing curves on my personal car - and there is room for more power - but the car is running on the ragged edge at that point and is 100 octane dependent.
You guys need to remember these cars are able to run as low as 87 octane gas, so from the dealer it has to be able to adjust timing for low octane and bad air. The everyday person doesn't care about what gas they use, and are not in to tuning.
For the enthusiast such as ourselves, we use 91 at least, all the time. Or anything higher we can get our hands on - so when we tune, we tune to have 91 as the lowest octane rating - allowing us to run much more aggressive timing and enable the car to rev and pull all the way to redline.