Quote:
Originally Posted by mfanatic325
How did SavSpeed get around the tuning then? How come everyone else can't crack the ECU? What exactly is holding us back? Aren't the superchargers doing just fine even with higher boost levels? They don't seem to have tune issues?
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savspeed used a motec ecu was it i think??? i dunno....
hmmm well tune issues has been well documented all over the spectrum from s/c to turbo on the z4m... it took ess ages to crack it and perfect it and i can still feel the odd rough patch in certain situations but this can be tuned out at the expense of the aggressive vanos timing (i dont want to loose that).... remember the VF EAS z4m car???? yup.... tune issues, that why we never got an update on it.... that came straight from someone dealing direct with eas, i wont say to much on that one as i dont want to step on toes.
Re the s/c turbo tuning, this is my feeling on it, the s/c can use the stock dme flashed, remember s/c cars can only have a certain amount of boost @ any given point so every single parameter can be "worked" out for the car... turbo??? very different, infinite different parameters at given situations.... so usually a standalone is used to do all the main work leaving the stock ecu to control other things like vanos or t/c or whatever. Saying that if your really a clever bear you can tune the stock DME for turbo applications like mike did on an e46 turbo, possible on the z4ms ecu??? i really wouldn't like to say.
boost isnt really the limiting factor for us, the s54 has shown to be a really strong platform for boost, iron block, forged internals (crank/rods), 11psi nets an easy 500+ rwhp.... from what i can see the ecu is out stumping block, its closely related to the s65 and much more complicated. Obviously within reason, its a high compression motor, so personally on a stock setup i wouldn't really want more than 9-10psi. Many more push more and the cars seem to last.
all in all its an exciting time for the z4m as its really becoming a tuner car, cheap to buy, strong motor.... im hoping this issue will be ironed out soon as id like to run pro-efi on a build motor and go for 12lbs of boost. i will be ordering vt2-550 for my birthday in october in the meanwhile as its available for european owners :-)
Mfanatic, from what ive read/heard from z4m owners with pro-efi, their is a communication issue between the pro-efi and the cars existing setup so it lights up th dash with all sorts codes..... hell it could even be a simple wire mixup, but im guessing thats not the case as jason would have wrapped it up by now... sadly everyone seems to be keeping lips tight RE this issue and doesn't keep us in the loop so we left to GUESS.