Open Tuning/Turbo Theory Discussion

Just looked over the last few logs I took before my engine went down and I don't have torque spikes. Both my timing tables are identical and sloped, and even with a boost spike early on (from heavily forcing spool) it's mostly flat. Also my OL/CL transition is 20, and my closed loop max load tables all match my load limits; I use load by gear to actually control target loads and dial that in appropriately.

 

Torque spikes may not be the best way to say it. Maybe instant WOT torque?

This is a good way to control load ramp and keep max torque down from early WOT (< 3K), but what if you are cruising along and then mashing it at 4k? Shit's gonna be hot and you are asking for instant max power.
I mean if you got meth and forged internals, it probably isn't an issue.

 

I was running an EFR turbo so you'd think the issues would be worse, but they aren't.

 

Appreciate the knowledge drop. From my years of self-tuning, I took a different route to completely eliminate spiking: boost control, particularly the WGDC tables and dynamics tables, in conjunction with the load targets/gear (I used a hybrid tuning strategy). I never had any spiking at all, even in the coldest of weather. I didn't find C/L to O/L transitions to have any affect on spiking either. In that regard, I just went with a that many of the top pro-tuners use in all their tunes, using a very popular, middle-of-the road C/L to O/L exit delay value, or adjustment of timing. Honestly, I didn't really touch C/L timing at all. I focused exclusively on O/L and had all of my tables matching. The tune was still setup to pull timing with knock events, obviously, and I ran (and still run) ethanol, so I wasn't worried about pre-detonation or uncontrolled flamefront. Knock events were very rare, besides the characteristic tip-in knock, and end-of-log pulling into neutral knock after hitting redline.

Just goes to show that some cars respond differently. Tuning is as much of an art as it is an exercise in knowledge expertise, IMHO. It's pretty much like wearing a toolbelt and having lots of options/strategies to get to the same goal; or, to put it more shortly, the old adage: "there's more than one way to skin a cat."