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Evo X Tuning Discussion for tuning & engine control systems that are unique to the Evo X. IF THE TOPIC IS COMMON WITH OTHER LANCERS, PLEASE POST IT IN: '08+ Lancer Common.

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Old 11-04-2010, 10:04 AM   #1
trulte
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Air / Fuel Ratio

Just installed a wb gauge to check if the engine is running lean.
The car is tuned with cobb stage 2 atm and using octane 95/98.

The wb gauge is about 10 when the car is still and 15 when I'm on full throttle.

I found this someplace:

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Old 11-04-2010, 10:08 AM   #2
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That's terrible either way. 10 is fucking rich to just be sitting still idling, and 15 is damn near piston melting under WOT.

Stop driving it WOT, now, until you figure out what the problem is.
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Old 11-04-2010, 10:23 AM   #3
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Really? :/

What is a safe value here? Under 14?
The car has an aftermarket intercooler and pipe, maybe it gets too much air because of that?
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Old 11-04-2010, 10:24 AM   #4
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You're actually showing 15 AFR at WOT? That's insanely lean for a turbocharged car.
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Old 11-04-2010, 10:33 AM   #5
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I agree. on mine Im at 10.9 WOT and 14.7 Idle
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Old 11-04-2010, 10:42 AM   #6
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Uhmm.. sorry a little mixup here

It's acutally 14.5-14.6 when still and 10-11 when on full throttle.

Maybe that's more normal
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Old 11-04-2010, 12:10 PM   #7
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14.7 is Stoich which is "Perfect" at idle

You want to be around 11-12 when your custom tuned for safe power

10-11 is on the rich side (Which is normal and safe for an OTS map from cobb)
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Old 11-04-2010, 01:00 PM   #8
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Quote:
Originally Posted by Stock? View Post
14.7 is Stoich which is "Perfect" at idle

You want to be around 11-12 when your custom tuned for safe power

10-11 is on the rich side (Which is normal and safe for an OTS map from cobb)
Cool!

Does that mean that the car can actually go a lot faster if I give it more air? :P
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Old 11-04-2010, 01:05 PM   #9
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lol sure!

Be sure to have a qualified tuner tune your car.
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Old 11-04-2010, 01:08 PM   #10
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Hehe, sounds fun.

The MR gearbox will probably not handle it though.
I guess the car is about 370-380 hp with the cobb stage 2 and 400 or something is maximum for the gearbox if I have understood it correctly.
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