Wideband readings.....
Wideband readings.....
So I installed my wideband and at 18 lbs my readings are in the 11s. Its 60 derees outside. My question is isn't that lean for a 05 evo with a tbe, o2 housing, intake and bc? The guy said I have a walboro 255 but now I'm unsure of that. The car is untuned. The wideband sensor is behind the testpipe could it be possibly too far?
how come the norm for tuning is running rich?
i thought max power was made at 12.5 AFR?
why not run 12.5AFR and pull out timing as opposed to running more fuel and more timing?
And i know someone will say they run rich for "cooling" the cylinder... but how much difference can a couple of mls of fuel make?
Just wondering.
Cheers, Mike
i thought max power was made at 12.5 AFR?
why not run 12.5AFR and pull out timing as opposed to running more fuel and more timing?
And i know someone will say they run rich for "cooling" the cylinder... but how much difference can a couple of mls of fuel make?
Just wondering.
Cheers, Mike
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For Evo's 11.1-11.4 is not rich. It's right where it should be 
Yes, gasoline makes the most power at 12.5 AFR - however the Evo's combustion chamber is not designed for such a lean AFR (keep in mind the 4G63 engine is almost 20 years old). The Saturn Sky is one of the only cars I know of that can run that lean, I believe it actually runs a 12.5 AFR.
-Bink
Yes, gasoline makes the most power at 12.5 AFR - however the Evo's combustion chamber is not designed for such a lean AFR (keep in mind the 4G63 engine is almost 20 years old). The Saturn Sky is one of the only cars I know of that can run that lean, I believe it actually runs a 12.5 AFR.
-Bink
I still think somethings fishy why would mitsubishi make the car run so lean stock. I measured and I think my the wideband o2 is too far. It was like 60 in from the turbo. Anyone know if the 10 degree angle on the o2 that AEM recommends is necessary for accurate readings?
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not designed to run a lean AFR?
because it'll generate too much heat? or det issues?
i dont really see your point.
just trying to clarify what you're saying thats all
because it'll generate too much heat? or det issues?
i dont really see your point.
just trying to clarify what you're saying thats all
For Evo's 11.1-11.4 is not rich. It's right where it should be
Yes, gasoline makes the most power at 12.5 AFR - however the Evo's combustion chamber is not designed for such a lean AFR (keep in mind the 4G63 engine is almost 20 years old). The Saturn Sky is one of the only cars I know of that can run that lean, I believe it actually runs a 12.5 AFR.
-Bink
Yes, gasoline makes the most power at 12.5 AFR - however the Evo's combustion chamber is not designed for such a lean AFR (keep in mind the 4G63 engine is almost 20 years old). The Saturn Sky is one of the only cars I know of that can run that lean, I believe it actually runs a 12.5 AFR.
-Bink
isnt the sky a direct-injection motor? or no? IIRC, only direct-injection motor can run that lean
but to answer the original question, 11's are fine
but 12.5 is too lean for a boosted motor
but to answer the original question, 11's are fine
but 12.5 is too lean for a boosted motor
FYI the sky (redline) is direct injection, the woman has one...
As for running 12.5 AFRs... it all really depends on how you choose to tune the car... I run mine at around 11.5/11.6 tapering to 11.1/11.2 however there are a few tuners that like to tune a leaner AFR...
As for running 12.5 AFRs... it all really depends on how you choose to tune the car... I run mine at around 11.5/11.6 tapering to 11.1/11.2 however there are a few tuners that like to tune a leaner AFR...
If this is on a gasoline wideband, that is quite rich for E-85. You can make quite a bit more power by leaning that out a little more. Even on pump gas, most people target ~11.5:1 A/F ratio. On E-85, I aim for 12:1 A/F.
Mitsubishi didn't; your mods probably did. The intake can throw off the MAF readings causing the car to run leaner, as well as the additional flow from the exhaust mods. And 11.x:1 isn't that lean, especially if it's in the low 11s.
Totally stock, the Evos tend to run as rich as 9.x:1 at WOT.
On what fuel? A lot of Evos here run 12.5:1 on race gas or E-85, but no one would want to tune for that on pump gas (which is what I assume the OP is using).
I still think somethings fishy why would mitsubishi make the car run so lean stock. I measured and I think my the wideband o2 is too far. It was like 60 in from the turbo. Anyone know if the 10 degree angle on the o2 that AEM recommends is necessary for accurate readings?
Totally stock, the Evos tend to run as rich as 9.x:1 at WOT.
On what fuel? A lot of Evos here run 12.5:1 on race gas or E-85, but no one would want to tune for that on pump gas (which is what I assume the OP is using).
Last edited by 97TSiAWD; Oct 20, 2009 at 06:42 AM.
I'll be tuning my car for about 12.0 - 12.2 AFR when i get my Red from the states.
We leaned up a standard evo 8, from about 11.0 to 12.0 and picked up 30kwatw (40whp) without touching anything else. Running 98 Octane pump gas.
If this is on a gasoline wideband, that is quite rich for E-85. You can make quite a bit more power by leaning that out a little more. Even on pump gas, most people target ~11.5:1 A/F ratio. On E-85, I aim for 12:1 A/F.
Mitsubishi didn't; your mods probably did. The intake can throw off the MAF readings causing the car to run leaner, as well as the additional flow from the exhaust mods. And 11.x:1 isn't that lean, especially if it's in the low 11s.
Totally stock, the Evos tend to run as rich as 9.x:1 at WOT.
On what fuel? A lot of Evos here run 12.5:1 on race gas or E-85, but no one would want to tune for that on pump gas (which is what I assume the OP is using).
Mitsubishi didn't; your mods probably did. The intake can throw off the MAF readings causing the car to run leaner, as well as the additional flow from the exhaust mods. And 11.x:1 isn't that lean, especially if it's in the low 11s.
Totally stock, the Evos tend to run as rich as 9.x:1 at WOT.
On what fuel? A lot of Evos here run 12.5:1 on race gas or E-85, but no one would want to tune for that on pump gas (which is what I assume the OP is using).