I buy the car about two month ago. The garage who sell it to me say it was de-tuned. So i bought a AEM wideband to see how it was tuned

The cars' is running 1 bar from around 3000 rpm to 6000 rpm and 1.35 bar from 6000 to 7500 rpm with an air fuel going from 10 in the low rpm to 11.X in the mid range and it finnaly going somewhere to 12.X in the last 500 rpm.

I am wondering if this is a good or bad tuning...

The mods are:
Fuel pump, Bushur full IC piping and intake, full 3'' catback without cat

 

And that is with 91 gas, the 91 V-Power we get in canada is supposed to be better than the 94 available here

 

the AFR should not be any leaner then like 11.4 on pump gas. i think

i would try to figure out why you lean out up top, thats not good

 

I doubt that the 91 V-power is better than 94, no matter what additives are in it it's still 91 and 94 is still 94...

Anyways, you should not have AFR's in the 12's at any time when under full boost, you definitely need more fuel in that area.

 

That's a horrible tune. Get it retuned before you blow something up.

 

Same gas as you were tuned on, ie - did you get tuned on E10 and are still running E10 gas?

 

The cars' is running 1 bar from around 3000 rpm to 6000 rpm and 1.35 bar from 6000 to 7500 rpm with an air fuel going from 10 in the low rpm to 11.X in the mid range and it finnaly going somewhere to 12.X in the last 500 rpm.

Is there any gas that causes the boost to be set stupid, and any gas that runs leaner in higher RPM?

 

LoL @ Toxin.


I would definately say you have a horrible tune. That or your wideband is off...

 

No but if he was mapped for at least what, 20lbs of boost (whatever the eff 1.35 bar is here in America) and he thinks he's running lean in the 12's I was questioning ethanol content. As long as it isn't knocking it's not going to cause any damage. He's not going to melt anything.

Does the OP know what kind of boost control he's using? Sounds like thats more of the problem. But yea horrible tune or something wrong in the setup - get it retuned and checked out.

 

ok so i think im overdue for a tune asap. Do 21-22 psi is safe on 91 ?

 

It should be, as long as the car is tuned for it.

 

where in the 12's is it? i mean if its 12.0-12.2 i wouldnt worry too much. but if its anything more then that then thats pretty lean. my car on pump usually is 11.5's until up top then it hits around 12.1 or so.

and remember. variables like humidity and temperature can change numbers pretty drastically. colder = leaner. which usually isnt an issue if your seeing leaner numbers when its colder out.

 

the car should not be in the 12's on pump gas at all. especially up top
you can get away with it with race gas, but not pump.

and the temperature shouldnt play a role in your AFR's. my wideband reads the same AFR's in summer as it does in winter. same with the humidty, it doesnt change AFR's.

 

oh ok. well based on my experience the iat sensor compensation takes a little control and adjusts fuel tables based on the temp. but just because your setup doesn't change afr's...doesnt mean someone elses car wouldnt either. closed loop will change afr based on o2 as well.

doesnt sound like your not even too confident what it should be. :P

and i never said it was perfectly ok to run it "lean" anyway. in all honesty, mid 11's is ideal.

goodluck.

 

What are the modifications done to the car, especially what size turbo do you have?