Could you guys elaborate on installing the NGK 5255 (bur9eqp) plugs ? When i switched to them originally (before I was boosted) I installed them into all 4 positions without any shims. The car seemed to run fine this way ? Is this correct ?

If it was installed incorrectly... maybe now I'm thinking that when I got boosted, this is the reason why I was getting some misfiring in the upper rev range ??

 

From what I have read and been told, the BUR9EQP (NGK-5255 IIRC) in the trailing position without shims will bottom out in the spark plug hole and can **** up the housings. I think you need about 2mm worth of shims but you better measure them and double check first. Proper prior planning man.

 

Check it:

 

might as well buy stock trailing and use the BUR9EQ in the leading. this would be Charles advice above

 

That's what I did, I didn't want to mes with shims at the time since I had a full set of new RX-8 plugs.

 

i use the denso's--they work better for me and seem to last longer. You can clean them with a small ultrasonic cleaner

 

The RX8 runs again !!!!!!!!!! Very happy right now, 72 euros for spark plugs is alot cheaper than 37k for the 328i I test drove after I thought I blew my motor... lol. Turns out it was a combination of a charge pipe coming off after the maf, the spark plugs dying, and the motor being super flooded. I dont know I think just in the heat of the moment once they car went crazy on the autobahn when I was doing the log, first thing that popped into my head was 'apex seal'. ---I hear enough rotary & apex seals jokes here from my friends in Germany, I guess I was almost expecting that to be the problem.

Well..... onto the next tuning session. Thank you guys so much for your guidance !

 

really glad I was wrong!

 

Called it

 

 

even neo eventually died.

 

Neo never got his fuel maps tuned all the way..

 

Haha, I am willing to bet at some point in Rotary Redliner (and my) FI days, our engine will too one day die.

It's just too addictive to be conservative.