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Old 08-02-2007, 05:15 PM   #1
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Default 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.
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Old 08-02-2007, 06:45 PM   #2
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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.
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Old 08-11-2007, 07:25 PM   #3
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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
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Old 08-12-2007, 02:28 AM   #4
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Originally Posted by 4sfed5 View Post
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....
You do realize that, even on the stock ECU, the timing does not stay at 10BTDC all the time, right?
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Old 08-12-2007, 06:55 PM   #5
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Quote:
Originally Posted by jonny View Post
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.
Jonny, I wouldn't even consider to use the grappy 91Octane Gasoline,
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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Old 08-14-2007, 07:16 AM   #6
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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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Old 08-15-2007, 09:31 PM   #7
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<BUTTHEAD>Hehe. You said retard.</BUTTHEAD>



Assumes a stock 10BTDC @ 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 10:13 PM.
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Old 08-16-2007, 02:48 AM   #8
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I'm interested in a timing map also. If anyone has one to post I'd be a happy camper.
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Old 08-16-2007, 11:03 PM   #9
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Originally Posted by lazzer408 View Post
I'm interested in a timing map also. If anyone has one to post I'd be a happy camper.
It'd help if you told us what engine the timing map will be for. Otherwise, I'd be happy to share with you the timing map from my lawnmower.
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Old 08-16-2007, 11:16 PM   #10
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Here is my ignition map. JRSC, 8 psi, 93 octane fuel, 14* static initial timing. Timing was set on the dyno by a professional.
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Old 08-17-2007, 01:37 AM   #11
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soflaric: That's not a timing map it's a compensation map.

Joe: I have a '94 1.8l turbo. My map runs to 18psi and 8000rpm. If you could provide the base map for that engine I can go from there. Thanks.
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