has anyone EVER tried 14.7 A/F ratio for fun?
10-07-03, 10:13 AM
#1
has anyone EVER tried 14.7 A/F ratio for fun?
Has anyone ever tuned their rotary engine for stoichiometric ratio? I know that is insane but so are some of the people on this forum lol
If not what is the highest A/F ratio anyone has tuned for?
If not what is the highest A/F ratio anyone has tuned for?
10-07-03, 10:46 AM
#2
Old [Sch|F]ool
Under what conditions?
If you do not have a catalytic converter it is advantageous to tune it very lean under highway cruise conditions.
Stoich is only important if you have a catalytic converter and you need it to work. Cats don't work at rich or lean mixtures.
If you do not have a catalytic converter it is advantageous to tune it very lean under highway cruise conditions.
Stoich is only important if you have a catalytic converter and you need it to work. Cats don't work at rich or lean mixtures.
10-07-03, 01:29 PM
#3
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As peejay said, the conditions mean a lot. I've gotten a rotary to run under very light load about about 16.2:1, but it made very very little power and lean-surged a lot. Best cruise mixture I've found is about 15.2:1 for a car with no cat. If it's got a cat, I tune for 14.7:1 under all steady-state low-load conditions, richer under accelerative load.
Brandon
BR7 Racing
Brandon
BR7 Racing
10-07-03, 01:59 PM
#4
Old [Sch|F]ool
Making little power is actually a good thing for cruise conditions. You have to open the throttle more which means less manifold vacuum which means less pumping losses from the engine trying to draw a high vacuum. End result - better fuel economy.
Popping open the EGR valve can do the same thing... reduces manifold vacuum, meaning the engine has to work less hard on the intake stroke.
Popping open the EGR valve can do the same thing... reduces manifold vacuum, meaning the engine has to work less hard on the intake stroke.
10-07-03, 10:22 PM
#6
Originally posted by No7Yet
As peejay said, the conditions mean a lot. I've gotten a rotary to run under very light load about about 16.2:1, but it made very very little power and lean-surged a lot. Best cruise mixture I've found is about 15.2:1 for a car with no cat. If it's got a cat, I tune for 14.7:1 under all steady-state low-load conditions, richer under accelerative load.
Brandon
BR7 Racing
As peejay said, the conditions mean a lot. I've gotten a rotary to run under very light load about about 16.2:1, but it made very very little power and lean-surged a lot. Best cruise mixture I've found is about 15.2:1 for a car with no cat. If it's got a cat, I tune for 14.7:1 under all steady-state low-load conditions, richer under accelerative load.
Brandon
BR7 Racing
10-07-03, 11:10 PM
#7
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There's no way to say... it simply depends on too many factors. The short answer is "whichever ratio makes the most power while still being reliable enough". Vague, but that's about as good as it gets.
Brandon
BR7 Racing
Brandon
BR7 Racing
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10-07-03, 11:16 PM
#8
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it really depends on how long you want your motor to last. Im sure the people out there that tune for every little bit, run the car on the egde.
The leaner you get the less life you will get out of the motor. Not sure about cruising though
The leaner you get the less life you will get out of the motor. Not sure about cruising though
10-08-03, 08:40 PM
#9
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Na's make the best power right before 14.7. Besides, all a rich mixture does is add fuel to cool the intake charge with (thus deterring detonation and preignition). Water injection can do the same exact thing.
CJ
10-08-03, 10:15 PM
#11
Originally posted by No7Yet
There's no way to say... it simply depends on too many factors. The short answer is "whichever ratio makes the most power while still being reliable enough". Vague, but that's about as good as it gets.
Brandon
BR7 Racing
There's no way to say... it simply depends on too many factors. The short answer is "whichever ratio makes the most power while still being reliable enough". Vague, but that's about as good as it gets.
Brandon
BR7 Racing
Rob
10-09-03, 10:35 AM
#14
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mine was so lean it would ping and stop running at about 4500in 3rd, engines fine
mike
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