On the EvoX's, there's a separate load for timing and mivec, as well as fuel. Is there a separate load for the Evo8's timing? I'm on rom 94170715.

The reason I ask is because as I'm tuning, the knock-free logs are showing (ie: 5 degrees at 4500rpms, load 270), and when I look that up in the rom timing table, it's actually (ie: 7 degrees) at that data-logged cell. It doesn't show 5 degrees until load 290.

I know I have a boost leak at the throttle body shaft seals, so I'm suspecting this could be throwing me off.

 

anyone?

 

Most likely its the air temp vs timing comp table pulling timing due to high air temps.

 

Its the Timing trims mate,

Air intake temp etc all contribute to what the car is actually going to run, just because its target timing is 7 doesnt mean it will hit it

Whoops must have posted at the same time, but as above lol

 

Thanks for pointing me somewhere. Is it common to modify those tables? I suspect on my rom, it's called "Ignition Trim vs Air Temp"?

 

So what I'm seeing is that it's better to tune in the cold (45-68 degrees ideally) and then the other temps will run safer because it auto-retards the tune?

Or...tune it in the hot weather and then overshoot my targets so that in 45-68 degree weather, it will be spot on? (which is what seems to be what I'm having to do)

 

I would tune right now and disregard the retard timing, because no matter what, your values now should have the effect of overshooting when the temps drop.

That way, when you retune in colder temps, you can compare the differences, and set the trims accordingly

Unless someone has a definitive value for the correct amount of trim to set... which im not going to bet on


but dont listen to me, I just started this. Just wanted to contribute some logic

 

Most will lower the "93" and "122" values by 1.

 

Thanks, I regularly keep checks on my tune, so I just thought it made no sense for me to artificially overshoot my tunes just to get the timing correct, esp. if I'm in hot and humid Orlando weather year round.

 

What you said is already happening. I tune during the day, knock-free, and then by nightfall, I start knocking on the same tune. It's very annoying. So I wanna tune these trims back so it works in the same day.

 

What does the 'Air Temp' in this table refer to? Air intake temp (at manifold)?

 

Air intake temp at the MAF, where the sensor is located.