air fuel ratio????

[nova turbo kev]

right ive got a c20let runnig evo 5 chips vxr injectors t3/4 turbo and a few other bits there the main ones ive just put a aem wideband on and when its on full boost which is only set at 13 psi atm when im on full boost the afr reads 10.2 and on tickover it reads around 14.2 does this sound right or not ive got a feeling its running rich but im not sure any help please cheers :thumb:

[Royston]

Ideal is @ 12.6 ish best for power, 10.2 is too lean, METLTDOWN............ wi da Booost

http://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio#Fuel.E2.80.93air_ratio_.28F AR.29

http://upload.wikimedia.org/wikipedia/commons/c/c4/Ideal-stoichiometry.jpg

I am by no means an expert

[nova turbo kev]

i best turn the fuel pressure before i take it back out cheers

[turbo-boy]

10.2 is rich higher the number leaner the
Mix, if u turn ur boost up abit it might lean it out and give u more power , mine
Idles at 14.8 which is bang on for no load on engine

[nova turbo kev]

im lost now so 10.2 is running rich then?

[Adam]

Ideal is @ 12.6 ish best for power, 10.2 is too lean, METLTDOWN............ wi da Booost

http://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio#Fuel.E2.80.93air_ratio_.28F AR.29

http://upload.wikimedia.org/wikipedia/commons/c/c4/Ideal-stoichiometry.jpg

I am by no means an expert
Other way round, lower numbers=more fuel=rich

14.7 is stoich, which is fine for an idling/light load engine.
Under boost you will be looking 12s and under tbh.
Best idea is get it on a RR so you can fiddle with afr there.

Slightly rich is "always" better than lean.

[Royston]

Other way round, lower numbers=more fuel=rich

14.7 is stoich, which is fine for an idling/light load engine.
Under boost you will be looking 12s and under tbh.
Best idea is get it on a RR so you can fiddle with afr there.

Slightly rich is "always" better than lean.

I stand corrected, re read the information, I am a Pillock:roll:

Sorry;)

[womble sri]

Make sure it has warmed up to get accurate readings (I'm sure you did before You gave it a fist full of boost)

[nova turbo kev]

yeah it allways gets warmed up before it gets loaded with boost lol ill have to see if theres a good rolling road near derby area that no abit about the c20let cheers everybody