CA18DET

On .7bar it runs perfect through the revs, but when i put it to 1.2bar in the higher revs it starts to stutter(kinda like backfiring), its never done it before, today is the first time, under boost while it stutters the AFR reads 13.5?? On.7 its 13.1 and 1.2bar 13.5 so it is getting the fuel it needs, what else can it be?

Use NF , and see what happens !

Might be spark,...check your plugs. Worth the check 🙂

Iv read that it might be plugs and i never changed them when i bought the car that time so they might be finished or just really old, will check them tomorrow

Spark blow out.

Gap your plugs smaller try again , Not the best solution but will work

+1 to what PFB said. And change the plugs as well.

Ok, so i let the car idle till it got to temp then took it on the road and played with the fueling a bit took the AFR from 13.5 at idle to 13.2/3, and it runs better now than after the dyno tune, the plugs all looked a bit worn so will be getting new ones asap

Ok, so i let the car idle till it got to temp then took it on the road and played with the fueling a bit took the AFR from 13.5 at idle to 13.2/3, and it runs better now than after the dyno tune, the plugs all looked a bit worn so will be getting new ones asap

What managment system are you using?

fuel is mr turbo the rest is stock

OK, So at Idle you running 13.5?

What is your load AFR? Your part throttal AFR?

Also what are you using to get your AFR"S

at ful boost it runs 13.6 and normal driving its in the 14 15 range, wil take vid of the gauge tomorow, using lambda about 50cm frm turbo exh housing

Wow.

13.6 at WOT your a very brave man.

I run 12.7 at WOT on the Sentra 11.6 On the SX.

I have tried running 14.7 -15.5 at part throttal but the car really feels dead in this range at slight tip in.

So I now run 14.2 -13.9 throttal responce is great.

Idle is at 15.5 as not much action in this area.

Does the fact that its a narrow band AFR gauge effect it?

Does anyone know how to tune the mr turbo system?

Yeah...your wasting your time with a narrow band...

wel I know its runing rich with the black smoke, that time u drove behind me did it make smoke when I boosted?

when you were on boost then it smoked a little yeah, a big puff when you floored it but then very little after.

ok kwl so its not lean then, il change plugs and see how it goes, what plugs would be best to use with my setup?

Grant222 wrote:

ok kwl so its not lean then, il change plugs and see how it goes, what plugs would be best to use with my setup?

Hopefully spark plugs boet 😀

Haha funny guy, what gap size etc, the ones on now are .7mm iirc