Quote:
Originally Posted by T1M
The NGK are a better plug IMO. Cars I've tuned idle smoother and take more timing advance than those running Bosch plugs.
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As I said that is a blanket statement and possibly correct but the point is that swapping them has made a difference for me specifically and confirmed by my friend. Now the issue happened with Bosch plugs and ran better with ngk. But understand that if Bosch plugs have a certain character, even if worse, when tuned you are changing it. So it's cool to try it and let us know but if you are changing coils and plug brand at same time you introduce two variables not one.
So the best thing is for someone who doesn't mind doing the work with a stock 1M to change to NGK and report back. But it's a lot of work and if you are correct and Bosch is crap that is what bmw tuned the idle and mapped with so if ngk is in fact better and different there would be a change ... for better or possibly worse.