hi to all brothers and sisters out!

i have bad fuel consumption on my evo 9 rs which may or may not be tuning issue and would like to get advises from u guys.

Im running on stock engine with Tomei 270 poncams with FP red. My fuel consumption is about 6km/litre which is quite high. Need some advise.

 

You posted in the wrong category bro this is dyno tuning results.

 

What fuel are you running? That's about 14mpg. I get 10-12mpg on E85, and 15-17 on pump gas.

 

The common cause of that is a failed NB oxygen sensor.
You can check it with a voltmeter or evoscan.

 

im running on shell 98.

 

everything good on evoscan. Don't really know what other stuffs causes bad fc.

 

When you say everything is good?
Do you know what to look for?

1/ max voltage of o2 sensor.
2/ Rate at which it sweeps up and down with a fast idle when it's fully warmed up

 

how do I check these 2 that u mentioned?

 

As above when you said it was OK.
Evoscan or voltmeter.


But you've made another thread saying you've got a 255 pump and big injectors but no mention of FPR.

So you'll also have the universal problem of FPR over run which you'll find when you check the fuel pressure with a gauge.

 

Sounds like a sensor for sure.

 

This is what my fully built 2.4 gets on 92 octane:

 

Could be something as easy as a bad tune as well. If it running pig rich--likely 2-3mpg rt there.

 

have you ruled out all the generic car stuff? Air filter, spark plugs, dirty injectors, good alignment, tire pressure etc? Hell driving at highway speeds with your windows down can have a decent effect on mileage.

 

yes all fuel related stuffs changed brand new, except didn't check it the injectors were dirty which I think impossible.

 

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