[Hikari]

If I had cleaned the endpipes an approx. 30 km had afterwards driven, like a sundays driver, means A/F ratio between 14,7 and 13,5 , the exhaust was again contaminated with a thin film of soot. Is this normal or is something wrong with the engine?
If it's normal, why the RB26 make more soot as most other engines. By part throttle of course.

 

[GU5I 80Y]

have you got a catalitic converter !

 

[Peter]

Hikari,

That's perfectly normal. Ideally, the AFR, under load, should really be in the 10 to 11 range.

Peter.

 

[Paul.GTR34]

Fuel/air ratios

Does that then mean he is running rich?

 

[Peter]

14.7:1 (air:fuel) is stoichiometric and is chemically the correct ratio for complete combustion. Above 14.7 is lean and below is rich. Ignition timing will have an equal affect upon detonation but ideally a forced induction engine should run rich under load and I'm told it should be in the range of 10:1 and 11:1 for the best results. Leaner ratios (stoichemetric and above) will apparently be OK for cruise situations.

 

[GU5I 80Y]

fuel mixtures

iam reading about that now

ecu maping
the lot
its quite interesting

 

[Peter]

Hi Gus,

Can you get hold of Mini Zs? If so, how much?

Ta.

Peter.

 

[GU5I 80Y]

peter

sent a pm