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wng691s clubby

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Cleethorpes

19th Jun, 2014 at 10:29:27am

what afr should we be aiming for on tickover Im currently reading 13.5

Done now needs redoing lol

D4VE

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lowestoft suffolk

19th Jun, 2014 at 10:40:18am

On mine i believe it flicks 14-15 without choke

On 24th Oct, 2015 jonny f said:
Nothing gets past Dave lol

NOTHING GETS PAST ME!! *tongue*

1/4 mile 14.7 @ 96mph 12psi boost
Showdown class A 2nd place 18.6 @ 69mph


Brett

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Doncaster, South Yorkshire

19th Jun, 2014 at 10:50:25am

14.7 I idle the skyline around 15.3afr but 13.5 should be ok
how much co @ idle you aloud? If you look up afr vs co chart it should give you an idea


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Sprocket

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Preston On The Brook

19th Jun, 2014 at 11:40:33am

As close to 14.7 as poss maybe a little richer if idle is poor.

For the mot most will be required to be bellow 3% CO but remember that is an average.

13.5 sounds a bit too rich for it to pass an mot unless its just a visual

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

tadge44

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Buckinghamshire

19th Jun, 2014 at 04:26:25pm

I don,t think the AEM is that accurate at idle.I show anything from 12.5 to 13.5 normally.

With a carburated engine my view is that it will normally be rich at idle to get a reliable idle and initial pick up.

I don,t have an MOT problem (Pre 1960) but I can appreciate that it can be necessary to have a weak idling mixture to pass emissions.

stevieturbo

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Northern Ireland

19th Jun, 2014 at 09:11:26pm




On 19th Jun, 2014 Sprocket said:
As close to 14.7 as poss maybe a little richer if idle is poor.

For the mot most will be required to be bellow 3% CO but remember that is an average.

13.5 sounds a bit too rich for it to pass an mot unless its just a visual


Up to 83 is below 4.5% and 1200ppm HCC

After 83 is below 3.5% CO and 1200PPM HCC..

However...I think there was a clause for MG Metro's and some other cars that if they couldnt meet these requirements at idle, a fast idle test was allowed ?
SO it may apply to other A-Series/SU equipped cars ?

As long as the wideband sensor is nowhere near the tailpipe, no reason why it shouldnt be deemed "accurate" as far as displaying AFR's to the best of its ability.

Displayed AFR's cannot be relied upon to be directly linked to CO, HCC, CO2, O2, or lambda though as other things can affect these readings as measured by a proper gas analyser. Like air leaks, misfires etc

In theory though they should.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

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