I know to get economy you should have leaner AFRs on cruise but how lean can you go without causing problems like burning valves? (toyota 3sgte engine BTW) I could fit an EGT but I would have to dismantle half the engine bay to do it - are there any guidelines? Im getting better than ever fuel economy just with my base map corrected by narrow-band so i dont want to push it too lean by being greedy!
J
Lean AFRs for cruise
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Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Lean AFRs for cruise
MSnS-E29q On a V2.2 soon powering a 3sGTE with stock sensors hopefully to approx 300 bhp.
Datalogs and current MSQ - http://www.jbuckle.homeip.net/datalogs
http://www.jbuckle.homeip.net/
Datalogs and current MSQ - http://www.jbuckle.homeip.net/datalogs
http://www.jbuckle.homeip.net/
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
CB,
Lean cruise mixtures won't generally burn valves, instead you get a lean misfire. This cause the engine to 'surge' (you can feel this if you watch carefully for it while driving) and the fuel from the misfires is completely wasted, so fuel consumption gets worse instead of better.
On my car, I cannot run leaner than 16.5:1 at cruise, but yours will probably be different, depending on things like the compression, cam, ignition, etc.
Lance.
Lean cruise mixtures won't generally burn valves, instead you get a lean misfire. This cause the engine to 'surge' (you can feel this if you watch carefully for it while driving) and the fuel from the misfires is completely wasted, so fuel consumption gets worse instead of better.
On my car, I cannot run leaner than 16.5:1 at cruise, but yours will probably be different, depending on things like the compression, cam, ignition, etc.
Lance.