Forgot to add:

Two gear pull under same conditions:
2nd gear
5555 232 11.86
5945 232 11.75
6573 225 11.96
6938 218 11.73
+
3rd gear
5559 234 10.84
6004 236 10.76
6547 227 11.00
6833 225 10.86

 

I haven't spoken to Jason in awhile, but I did get the impression there are quite a few more tables to be published, I asked specifically about a closed loop AFR target table.. I do think the open loop load tables are where someone should look closer since they appear to be expected target load tables of some sort..

 

are you able to explain the Open Loop Load #1 and Open Loop Load #2 table and what they do?

 

Tis why we specifically tune for 1-4 gear passes while tuning and also lean on 4th gear data for final AFR as the last gear in the 1/4 for most Evos. The first 3 will run leaner. Interesting question on the speed sensor Martin.

 

Nah not yet, I haven't gotten to them yet..

 

so should i shoot for 11.5 AFR in 4th gear or 3rd gear? because when i did tunned for 11.5 in 4th, i was hitting a max of 12.0 in 3rd gear.

 

Your offsets sound correct. I can tell you what "I" do on my own car. What you do is on you Faisal.

I tune for target AFR in the last gear I experience in the 1320'.

 

what would you recommend as AFR range/values to tune for - in a daily driven Evo that runs pump gas w/o alky.

 

+1. what would i want to shoot for doing 3rd gear pulls? i don't have anywhere convenient to road tune with 4th gear pulls.

 

Depends on weather, temps, octane. 11.5 AFR on 93 oct in FL weather works well for me. YMMV.

 

 

Bringing this back up. I am not sure that VSS has that much to do with it. Look at the data at 5500 and 6000 RPM:

We are talking VERY comparable boost levels (+/- 7 KPA max) and very comparable RPM points. The major difference is single-gear vs multiple-gear. I would think, if it was VSS related that there would not be such a dramatic difference in the 3rd gear-only pull vs the same points in the 2nd + 3rd pull.

So I am clear, everyone else is tuned this way? Meaning, on a drag-style pass with your 3rd gear dialed in, you can be running as much as 1 AFR point leaner in 2nd and 1 AFR point richer in 4th?

 

I would say 0.5-0.8 AFR is about right.

 

It depends on the intended use of your car. Most of those who drag race tend to tune leaner than those who hotlap their Evos. Running 11.5-12.0:1 for a short blast down the 1/4 mile might not damage your car as bad as running the same AFRs for a 20 min hotlap session. This is assuming 93 oct gas.

My car was tuned in 3rd gear in the low 11:1 and tpaering 10.9-10.8:1 by redline. It gets richer in 4th gear, but I do not mind that since I intend to hotlap the car in the future. Here in SoCal our tracks ar in the high desert and it can get hot. Tuning rich in 4th gear helps reduce detonation.

 

I don't agree with your terminology "damage your car". If you car is not preigniting or detonating, there is little cause for concern. Much depends on your local weather and humidity as to what works best. 6sp MR's also have short gears and the offset is a bit less.