I advance about 1 deg every week or so and monitor the fuel economy. It has been on the rise that is for sure, especially at cruise.

 

I started simply by adding 2* to 2250-4500 from 0-40 load and that even helped a bit. I'm going to put 44* to 2500-4000 0-40 load, and even tweak the 50-100 load% a bit like you did and see what I get. Right now I'm averaging about 1.5-2 MPG better and I'm not driving it any differently, so hopefully adding a bit more timing throughout the lower load range will make it even better.

 

It's better to adjust the 40-80 loads. And up them like 2-3 degrees.

 

Here is my timing map:



Gets me 21-22 mpg combined city/highway and 26-28 mpg highway.

 

May be a dumb question, but I'm curious...

Does the MPG shown on the dashboard take your map changes and show you your new MPG based on the changes you made, or does it always just show you your MPG based on stock specs? I'm guessing it recalculates it and gives you the new fuel mileage.

 

It does take changes. It calculates much better than doing it the pen and paper method. I seen changes at least.

 

With all of the tweaks I've made, mine has stayed to within 1 mpg of actual fuel economy.

 

Is anyone running more than 44* timing in the 0-40 load range? Is there any improvement in fuel economy from going higher than 44*?

 

I've run 42-43 at lower RPM's and 44 at 3500+ in those lower load cells. Last week even on winter gas I was able to get 30-31 mpg as usuall on my drive to work at ~70 mph but the car was already fully warmed up from a previous drive. I think most of the worse gas mileage claims you see in the winter is when you include shorter trips where more time is spent getting the engine up to full operatiing temperature. Once you only test mileage after you are on the highway at cruising speed I'm getting very repeatable results maybe only slightly less than what I got during the summer.

 

does anyone see any problem with me changing the timing with the Cobb stage 2 map? I just want to make sure... i'm going to do 3* 0-40 load from 2250-4000 or 4500 maybe BUT can I get away with 3* from 40-80 as Clipse3GT had suggested? If yes, then what RPM area? The same 2250-4000?

oh and mods are TBE, UICP, Drop in and boost pill removed.

 

any help on the above ? 40-80 load adjusting?

 

0-40 load I think a conservative approach if you don't want to test multiple speeds and timing settings for best vacuum is to start at +2* at 2500 and work your way up to +3* or +4* at 3500-4000 or so. When setting the 50-80 load range I think +1* at 2500 and increasing to +2* or +3* at 3500-4000 should work as well. Likely you will want to increase it less as the load increases but can get away with a bit more timing as RPM goes up as well. Someday I'll test what the best timing is to the nearest degree cruising at 65, 70, 75 and 80 mph but for now those are the guidelines I went with and I can manage 30-31 mpg cruising on the highway at 70 mph.

If you want I can post the latest timing map I've used for the last 3 months with success.

 

that would be cool, just to get an idea.

 

just to clear something up from previous discussion in this thread... if you change the scaling (for E85 say) then the MFD is off on it's MPG. I consistently get 26+ on the MFD, but I'm at the gas station at 175 miles like clockwork...

I'm going to be playing with this stuff soon to see if I can get an increase in MPG... I do a lot of 70-75 cruising (Texas is a big place lol) and an increased range to events would be nice. Even if I have to swap maps once I get there.

 

Yup, it's most likely an equation off 513 (stock injector scaling) like MPG is in Evoscan.

Larger injectors (and scaled for it) will throw off the MPG reported on the dash if that is indeed true.

I've been messing around with mileage tricks on E85 for almost two years now on my personal Evo 8. Today I added 2-3* more in my cruise loads for my Tahoe trip which is all hwy. Last trip I averaged 18mpg on E85 for the trip. So far on this trip I am averaging 20mpg. Just some food for thought.

I am using the traditional MPG method which is mileage divided by gallons pumped.

- Bryan