Ignition Timing Map?
08-02-2007, 04:15 PM
#1
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Ignition Timing Map?
Does anyone know how much the ignition timings should be with 91 octane?
I have an EMU and my car has no knock sensor. I will not damage my engine. I will drive my 91er 1.6er Miata with 10PSI and safe ignition settings.
I have an EMU and my car has no knock sensor. I will not damage my engine. I will drive my 91er 1.6er Miata with 10PSI and safe ignition settings.
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08-02-2007, 05:45 PM
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Assuming your base timing is set to 10 degrees BTDC, the usual convention is one degree per PSI, however there are many variables from car to car.
Originally, I found that even with my FMIC I had to pull somewhat more timing than this to avoid pinging. There was no carbon fouling of the chambers and the fuel was spot-on, so I've never been able to explain this. Now that I am using water/alcohol injection however, I am pulling considerably *less* timing than this, and have not experianced any ill effects from it.
Originally, I found that even with my FMIC I had to pull somewhat more timing than this to avoid pinging. There was no carbon fouling of the chambers and the fuel was spot-on, so I've never been able to explain this. Now that I am using water/alcohol injection however, I am pulling considerably *less* timing than this, and have not experianced any ill effects from it.
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08-11-2007, 06:25 PM
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yeah make up a map that takes out 1 degree per PSI in the 3000 to 5000rpm zone.....BUT then add in i degree per 1000rpm above5000rpm,evry 500rpm below the 3000.....so at 10 psi youll have -8at 2000rpm,-9 at 2500 -10 at 3000-5000 then -9 at 6000 and -8 at 7000....
adding in those 2 extra degrees at high rpm makes a BIG BIG difference on top end power
adding in those 2 extra degrees at high rpm makes a BIG BIG difference on top end power
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08-12-2007, 05:55 PM
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use "Superplus-98 Octane" if you like your engine...
for the others- I'm from Germany, he's from Austria, we do have a different measurement system for the OCTAN numbers,
what he calls "91 Octane" is actually " 87 Octane " in the United States.
So what would you consider as a safe Octane number for running 10PSI?
German-------------------US:
normal (91)------------ 87 Octane
super (95) ------------ 90 Octane
Super Plus (98)--------- 93 Octane
Optimax (100)---------- >95 Octane
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08-14-2007, 06:16 AM
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yes joe i do realise that..i was talking about the amount of retard to use from the stock timing curve..if you keep it at -10 below stock curve youre missing out on power ...putting back in a few degrees above 5000 unleashes A LOT of HP
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08-15-2007, 08:31 PM
#7
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<BUTTHEAD>Hehe. You said retard.</BUTTHEAD>
Assumes a stock 10°BTDC @ idle base timing, and WI. Could probably bump it a few more points with decent gasoline.
Assumes a stock 10°BTDC @ idle base timing, and WI. Could probably bump it a few more points with decent gasoline.
Last edited by Joe Perez; 08-15-2007 at 09:13 PM.
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