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Old 07-25-2003, 12:19 AM   #1
cdvma
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Default Tune for 14.6:1?

Just a quick newb tuning question. What would be the best AFR to tune for in general? If 14.6:1 is stoich then should you aim for that irrespective of throttle position or engine speed? The type of tune I'm talking about would be midway between agressive and daily driver. Thanks.
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Old 07-25-2003, 01:02 AM   #2
Darshu
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Um, yeah, that's not a very good idea Turbo cars are going to need to run a fair bit richer than that for maximum power and richer still for maximum safety. 10.5-11:1 is a better place to start... You can run leaner with higher octane, but on boost keep it in the 10-12:1 range for best reliability. You car will try to run 14.7:1 when it's using the 02 sensor for feedback, which is best for cruising, but is unsafe when you're making real power. Even N/A cars generally run 13.5:1 under load.
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Old 07-25-2003, 02:10 AM   #3
cdvma
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Alright, cool. I'm not going to be tuning anything soon, I'm just more curious than a pack of cats. If you got any links or documents on tuning for AFR lemme know.

Thanks.
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Old 07-25-2003, 04:42 AM   #4
PaulRex
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thank god you asked here first..

Besides that, how will you know what AFR you are running at? Do you own a wideband tuning apparatus? If you go to a respectable AWD dyno, they should have guys on hand to tune your car or at least help you out. They will have a sniffer that can tell you the a/f ratio.
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Old 07-25-2003, 12:55 PM   #5
cdvma
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No, unfortunately I wont have access to a wideband unit. But I'm also not doing tuning so its all good
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