this applies mainly to the vacuum portion of my map but could apply to boost as well when the turbo goes on.

afrs in 1-4 are nice and where they should be, but 5th gear is noticeably richer. i mean 4th gear at 3krpms and 15" my afr is about 14.5-14.9:1, and the same load/rpm in 5tth gear im looking at 13.8-14.2:1

ive tried the gear corrections going all the way from 72 up to 90 in 5th (even though i think that applies more to timing). im just trying to get good mpg on a map thats got a good 11.7-11.4 boost af

 

Theoretically what is suppose to happen is your use the longer gears to fine tune your maps. So if your running rich in the 5th gear then you should lean it out some. You also have to remember though that when your cruising in 5th and say go up a hill your put load on the car and can get into low vacuum numbers. Those low vacuum numbers are close to boost transition usually have AF in the 13's so that might be what your seeing.

I hope that made sense, I just got off work and am tired

 

^^^ it makes sense.

more load = richer afr to deter high egt's. all my gears have 13.3 at about 0" and that leans to about 14:1 at somewhere around 8", this includes 5th.

my concern is the 10-20" cruising range. im trying to set this up for good mph( ls motor/ls trans) and id like to get close to if not over 30mpg. im currently seeing mid to high 20's. ideally id like to have a nice 15:1 afr cruising in 5th at like 14-18" and i just cant seem to manipulate the fuel maps to get that without drastically changing the afr in other gears.

 

What version are you using? I have this problem when trying to tune my buddies b-series. P72 ecu, map so on. But on my SOHC setup, i always have 14.8 ratios in every gear at my cruising speed.

 

1.70, ive been using it for a while now, on 3 of my setups and a few others for friends

 

If you're doing a lot of tuning you can just turn off your o2 sensor and run open loop. I ran open loop on my old D turbo and tuned it myself with uber and got 40 mpg highway.

 

o2 is off, i dont even have one in the car ( besides the wideband but i dont have it wired into the ecu)

 

Well then that's the exact way I had mine running and I could get it to run 15-16:1 AFRs in fifth for me using uber 1.7.