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Old 05-29-2010, 01:27 PM   #1
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Default Car is running ultra rich it seems, bad gas milegae,help?

Just go tmy car a few weeks ago. Has Greddy turbo/manifold,RX-7 injectors, megasquirt, 3" exhaust/no cat, LC-1 WB..


It was tuned in Feb at UMS tuning in Phx (good shop)


Last owner said it is a very conservative tune since it gets so hot here. I backfire almost every time I get on it, and my HIGHWAY gas mileage is about 23-24 mpg


If I can get a working laptop, what should I check, or what software should I run a log with? My LC-1 O2 sensor got shorted out, so that isn't working. Too log AFR do you have to hook it directly to the LC-1, or does it all go through the MS?



Sorry for such noob questions...

Thanks


JB
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Old 05-29-2010, 01:35 PM   #2
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Download Megatune. Set it up. Make sure your LC-1 is hooked up to the MS. Go to the highway, or any long strech of road. By usign the "datalog" option in Megatune, do a 4th gear pull. Then post, anlyze, and profit.


I think that'll do.

Edit: Turnerstudios is $40, with a better VE analyzer; Megatune is free. Just in case someone bring up "why megatune?"
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Old 05-29-2010, 01:42 PM   #3
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My LC-1 is broke, the wire going to the sensor is either broke or shorted.
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Old 05-29-2010, 01:52 PM   #4
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Pictures of said wire?

Without your WB, youre **** out of luck.
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Old 05-29-2010, 02:08 PM   #5
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Well basically where the sensor goes into the downpipe the back of the sensor is mashed against something. I'm not sure where the short is.
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Old 05-29-2010, 02:20 PM   #6
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Maybe you should think about getting that fixed first? Also get megatune like said above and post your msq.
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Old 05-29-2010, 04:04 PM   #7
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I would die for 25mpg. Best I can get is 21 on Highway... About 14 city.
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