bryand said:
Twin Turbo said:
I had a JB4 for over 3 years - three warranty claims - gearbox, MAF sensor, and roof - no issues with BMW warranty - all these repairs were covered.
Just remove the box - before going in for a repair.
I did nearly 40K miles with JB4 stage 2 - and knocking out over 300BHP in my 28i
I've heard good and bad things about the piggyback boxes so was going down the route of a permanent map, will have to do a bit more research it seems.
You should bear in mind that in most cases a piggy back box can only fool the original ECU and original software so far...
So for example if you look at Racechips that do a range of boxes for a wide range of cars and scroll down the BMW Z4 E89 N20 engines 1.8 2.0 2.8 you can see that they can only get so much gain from each engine due to the fact that they start with the limiting point of the original engine map...
So the 1.8i with one of their chip boxes cannot get anywhere near the 2.8i with the same chip box...
That in mind is a key decision point if you are doing the 1.8i or 2.0i base car power upgrade....
Some savvy people have just taken the 2.8i s/w map and re flashed a 2.0i to get the same power as the 2.8i..
So even though I originally thought the two options were closely run/...I would suggest IMHO that for the 1.8 and 2.0 fsmily the ECU REFLASH is the way to go...
Personally I wouldn’t stop at the 2.8i power level I would go to the 280bhp ish...
Celtic have now backed off from 295 to 280 just to give a bit more headroom..
If you look at all the calcs that places it well within gearbox and brake limits..
Bear in mind in the UK based on my experience you can only hold remapped full power for around 10 seconds in almost all circumstances since you run out of road...from rest your doing over 90mph...
