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Thread: Road tuning - ignition timing & AFRs

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Posts: 1-8 of 8
2012-04-16 08:45:58
#1
Road tuning - ignition timing & AFRs
Hey guys,

I'm running a local full EMS system on my car. I usually have it tuned on a dyno by professionals, but often find that the map needs adjusting on the road afterwards as conditions are somewhat different.

So I've taken to road tuning it myself lately. I have a wideband in the car and I've pretty much gotton the hang of tuning the AFR's myself.

Now, I tune the AFR's for 14.7-15.0 on light throttle and low RPM. Then through the medium throttle positions I go to low 14s and then for full throttle high rpm I target 12.7-13.2. The car feels ok, but are these the optimum AFR's for power on full throttle?

Now, my main issue is ignition timing. How will I know what is optimal and what makes the most power, without being unneccessarily harsh on the motor? Or is it simply a case of advance , advance, advance until it knock is audible and then backing off a few degrees?


Muy tuning maps are quite simple to use. Just RPM And throttle position. The EMS interpolates the inbetween values itself.

2012-04-16 09:10:58
#2
I should mention it is for a N/A sr20ve.
2012-04-16 19:01:52
#3
What is the CR??
What fuel used??
What load??
2012-04-16 19:05:28
#4
Factory stock VE
95 Ron
Not sure how to specify load?

1660 ft altitude so less sensitivity to knock.
2012-04-16 21:15:07
#5
Originally Posted by Doctor
The car feels ok, but are these the optimum AFR's for power on full throttle?
Seems in the ballpark to me.

Originally Posted by Doctor
How will I know what is optimal and what makes the most power, without being unneccessarily harsh on the motor?
If you know what your EGTs are at best torque then you can tune to those same EGTs everywhere in the rev range and get best torque. That info requires a dyno at first though, and an EGT setup obviously.

Originally Posted by Doctor
Or is it simply a case of advance , advance, advance until it knock is audible and then backing off a few degrees?
You can absolutely do this. This works on engines that are knock limited, which our engines are with normal pump fuels. Just make sure your knock sensing method is reliable.
2012-04-17 07:51:26
#6
Had a test run against my GF in her s2k this morning and the cars are pretty even up to around 140mph so I think it's running ok for a stock ve now.
2012-04-17 14:25:32
#7
When i street tune the ignition maps, i find that advancing ign. timing until the AFR's start to get unstable to work the best.
2012-04-17 15:56:19
#8
What do you mean unstable? You mean fluctuate
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