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AFR without dyno 

 

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 Post subject: AFR without dyno
Posted: Fri Nov 28, 2008 1:29 am 
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I've just put an AU 70mm maf on my ED and will soon put an AU 65mm T/B on and I'm curious if there is a way to check my AFRs without having to pay for a dyno run? Or do I really need to check anyway? Only other mods are pod, cold air & 3" cat back. Any help greatly appreciated.

 

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Posted: Fri Nov 28, 2008 1:36 am 
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I wouldnt think your afr's would change at all without adding boost or changing things significantly.

You did your research into the maf's before you carried out the work?

The only way i know of how to check if the engine is running too lean or too rich is by checking the sparl plug, goto www.autospeed.com(.au) ? and do a search for spark plugs, alot of people would benefit from ALOT of the articles on that site :)

 

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Posted: Fri Nov 28, 2008 2:15 am 
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you could by a wide band afr gauge and look that way
being a 8 you will need 2 gauges and 2 wide band hegos

 

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Posted: Fri Nov 28, 2008 8:57 am 
Getting Side Ways
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You can get away with one, running off just one bank though.

When my mechanic tunes his cars, he goes solely off his plugs and he was running an 11sec methanol injected 308 VP commy

 

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Posted: Fri Nov 28, 2008 12:54 pm 
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Scaffy wrote:
You can get away with one, running off just one bank though.

When my mechanic tunes his cars, he goes solely off his plugs and he was running an 11sec methanol injected 308 VP commy


agreed, but plug reading is an old artform and not many mech now days will be able to read them correctly

im sure they can read them as in rich or lean
but not to the degree your mech does

 

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Posted: Fri Nov 28, 2008 12:59 pm 
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Very true. I don't think I'd rely on too many people, or myself, to tune off the plugs. I show him plugs and he gives me a run-down of how the car's been running. I look at the plugs and they just look like plugs...

 

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Posted: Fri Nov 28, 2008 1:58 pm 
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Scaffy wrote:
Very true. I don't think I'd rely on too many people, or myself, to tune off the plugs. I show him plugs and he gives me a run-down of how the car's been running. I look at the plugs and they just look like plugs...


hahahah now thats a mech with good experience
i can tell if they are lean or rich and thats it and think u will find he know how lean or rich the plugs will be!

 

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Posted: Fri Nov 28, 2008 2:24 pm 
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He can even tell if there's been the slightest amount of pinging

 

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Posted: Sun Nov 30, 2008 7:12 pm 
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If you still have the 19's in it it should run pretty good. Generally the extra unmetered airflow leans the WOT fueling out just enough to make more power. It'll probably hang somewhere in the high 12's to low 13's at WOT from 3000rpm-up.
The best way to check your WOT fueling is with a wide band HEGO sensor as Franks says but, as you are only after an indication of WOT fueling you can unscrew just one of your narrow band HEGO's and use the WB in that header. I use an Inovate motorsports LM1. It costs around $350 with a sensor and can actually log some other signals if you need it to.
Remember to clear your KAM after running minus one HEGO.
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