hi everybody

my evo 8 air fuel mix reads 14. on idle but on full boost it goes way down to 9. 10.
i heard its suppost to be 12...im runnig 22 psi...do i have to get it tuned to stay 12. or it could be something wrong...or anything that i could do...

thanks for the help...

 

You should be around 11.1-11.3 at full boost

 

like he said.i don't think you want to go below 11 on gas.

 

So what should I do to fix?
Get it tuned or there's other way to adjust that?
Thanks for the help

 

First check for boost leaks, that will be the only way to fix it with out a tune. If no leaks, then tune. If some leaks, and it rasies a bit, a tune will bring it the rest of the way back once you have no air leaks.

 

Eh, just crank it up to about 25-26psi... that should even it out at WOT. lol

 

That's way rich you'll foul out your plugs or wash down your cylinders if its consistently doin it in the 9s 10.0 to 11.0 is somewhat on the rich side but still safe. And considering ambient temps droppin everywhere for winter I would have your tuner look into it, either boost leak like someone mentioned or possibly a leaky injector. Now do u have a wideband or are u datalogging it.....

 

Its deff not a boost leAk and I'm using a wideband ...The injectors look fine too..so I deff need a tune up.
Tx

 

I would say it is a boost leak. Boost leaks cause the car to run very rich if previously tuned.

 

Could be a boost leak, or you need a tune or better tune. Either way I would retune it you dont want to mess up your motor.

 

You are running too lean. It has to be no less than 11 at full boost.

 

e85 needs to be around 12 and pump gas between 11.0-11.8

 

You are running very lean! It should not read under 11 at full boost. Turn down the boost to rich out the mixture a bit.

 

He is running afrs 9-10 which is rich. Low to mid 11 are usually fine.
Higher afrs are leaner, lower afrs are richer.