Evo 8 Ignition Advance Problem

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Evo 8 Ignition Advance Problem

Postby Vlad on Fri Sep 15, 2017 9:25 pm

Hy guys, really need help on this, since i-ve checked and rechecked the tune, and found nothing. Engine is a 2.1L 4G64, portend head,valves, solid lifters, magnus mannifold, GTX3583R, ignition projects coils and amplifier and 4-8 M800 PNP. I am experiecing some trouble with spark blow, but that's not the biggest problem. In the log i'm ataching, you can notice the ign advance goin in the timing map value, then, with the TP100%, constant boost and rpm rising, the ign start's to go up like crazy. i have checked all the compensations that are related with the ign timing....and found nothing....the car pushes about 700 crank hp at 2.2bar, E85 tune. Please take a look and give a shot at what it could be with the timng. Knock voltage goes up when the car is missfiring, no real knock in the headphones. Thank you.
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Vlad Pescaru
JPR Engineering, MoTeC Authorised Dealer
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Re: Evo 8 Ignition Advance Problem

Postby Scott@FP on Sat Sep 16, 2017 4:10 am

Reset all your odd fire TDC's back to zero and see what happens.
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Re: Evo 8 Ignition Advance Problem

Postby Vlad on Mon Sep 18, 2017 1:44 am

Values were filled in by the previous tuner...didn't even cross my mind to check them...But, even thow i set them to 0, the advance still dose the same
Vlad Pescaru
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Re: Evo 8 Ignition Advance Problem

Postby Sean on Mon Sep 18, 2017 8:09 pm

Vlad, can you be more specific about what is concerning you please? Is it where the logged timing ramps up from 0 degrees to 28ish with the boost and throttle still on? If that's it, up the log rate on the ignition timing from 2hz to 20hz and try again, the logged trace is just interpolating between the very few samples. Or am I barking up the wrong tree?
If you press 's' in i2 it will show you the actual samples....

***EDIT*** Regardless of anything else I'd strongly recommend upping the log rate anyway.
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Re: Evo 8 Ignition Advance Problem

Postby Scott@FP on Tue Sep 19, 2017 2:09 pm

I think Sean hit it, didn't even notice the 2Hz rate, that would do it.

For normal logging try to match logging rate to the rate of change the channel will see- IPW, timing, RPM set faster 20 Hz and up. Coolant temp can be 1Hz, air temp 2-5 Hz etc. If you are logging duty cycle of an output, say a boost control solenoid, and the BCS is set to operate at a 20Hz frequency it does no good to log faster than 20Hz. Save the fastest settings (100-200Hz) for tracking issues (jumpy TPS for instance), or channels that have a fast rate of change like knock voltage. Most of the analog input channels are sampled at 100Hz so logging them faster does nothing beneficial.
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