thats correct.

the pump failling, or not providing enough pressure will not hurt anything, and you can drive with the 3 lights on without issue.

i had a pump that in above 80 degree weather couldnt create enough pressure, did that for like 4 months, then someone hit the car ad wrecked the pump anyway so i got a new one.

back on topic, i did 24mpg back to back on two 200 mile trips this weekend (all highway). could still add more timing. this is also with a flaky front o2 sensor. so all in all not that bad imho.

 

With the help of Raptord, my map looks like this now. I am getting nowhere close to his mileage mpg though.

Evo 8 - 93* fuel, Bbk Full / / OEM Long Block (Kelfords 272s)

Round 1
Test 1: 20.3 mpg (10-16-2011)
Test 2: 17.5 mpg (10-28-2011)

 

Maybe cruising rpm matters too. For example my current tank I tested I drove 50/50 highway/city and got 26.9 MPG. Even in the past I didnt do so well on the highway. So probably our driving style on what RPM/speed we choose to cruise at falls in that certain "sweet spot" on the timing table.

Right now I'm keeping my current map and will do some testing to cruise with slightly higher rpms as opposed to keeping it as low as possible in my previous driving habbits.

 

90% of the time I drive very conservatively on the street - that may be part of the reason we aren't getting the same mileage. On my last tank I did do a few good pulls and I had 20.1mpg I think.

 

Would you mind if I tried this cruising timing map? Or is it a bad idea to copy it?

 

You're welcome to try it, I don't make any guarantees though, your mileage (pun not intended) may vary!

 

What would need to be changed from above map for E85?

Gotta do something to squeeze some mileage out of tanks of E besides staying out of boost...

 

Shouldn't have to change anything to run it on E85, this is on 91 octane.

 

Im not looking to get record mileage. Just want it better. Thanks Ill try it.

 

Bump! Any new updates?

 

Any further results especially with the EGR system completely removed?

 

I cruise at 32 no EGR 22 mpg. stock narrow band cl control. Im gonna play with getting a little more timing in my set up. id like to see 24+

No egr, because I have a skunk 2 intake manifold

 

@acidtronic, nice expanation of the center diff.

is there any logic to inducing knock at cruise with too high timing or too lean an AFR? Some of you have really high timing at cruise to do this but are you inducing knock? if not why wouldn't the timing be super high in that area stock? What is the compromise?

I have Ben pulling timing because of cruise knock, but am getting 25 mpg on long flat stretches of highway driving.

 

The stock stuff adds in egr advance. Which is more than any of these guys are running in their main map. Do you still have egr? It allows a higher ign adv

 

I don't have anymore EGR. I know there was compensation for putting the exhaust gas back into the intake. I am not aware of how the timing does that, but I thought it was simply start up based while the cat is not fully heated and effective.

On another note I was thinking even my moderate timing is causing cruise knock, which is at 70 load, so even more timing from EGR would theoretically be even worse, correct.