I have a 2000 E350 and a DP F5 and running in 60 Econo.

I'd like to know if my shift patterns are the same as everybody's or if the DP can be 'tuned' to change the shift patterns.

Because I'm mostly after bettering my economy, I'd like to know if it's normal for the tranny NOT to shift into the next higher gear when I take my foot off the accelerator. Right now, if I'm in second or third gear, driving around town, backing off the throttle leaves the tranny in gear instead of coasting and I'm buzzing the motor...just like a standard tranny.


Can the DP F5 be made to up-shift when taking your foot off the throttle and/or not down-shift when decelerating.

 

I dont like the way the 60 economy tune shifts all my other tunes shift fine goin from third to fourth it hits about 2500 rpm till it will shift that's on the freeway all of the other tunes I have shift perfectly it almost feels like it's a 60 tow instead of economy. I just don't use the 60 anymore

 

Yes, that is one of the many perks of custom tuning. Give Jody a call and he can get it tailored to your needs.

 

Since installing the DP F5, I have installed a SG II and GPS so now I have a tach and accurate speedo and Odometer.

Anyway, I haven't tried the 60 tow since getting the SG II and GPS so today while doing a regular run (35 mi each way) using the 60 econo and averaging 14-15 MPG on the SG II, I switched to 60 tow when I got up to the turn around point.

Surprise, surprise! I got an average MPG on the SG II of 21 MPG and that was going thru town part way because of commute traffic.

That sure sounds bass-ackwards to me. I would have expected the 60 econo to have better mileage then the 60 tow. Whadaya think is going on?

 

Shifting can be tweaked for anything. Sounds to me like you prefer more of the stock shifting. Jody's tunes usually modify the shift points, pressures, as well as enabling the trans to remain in gear (3rd and 4th gear) when coasting.

Fuel mileage, when being calculated electronically, is no longer accurate when a chip is installed. The fuel mileage is calculated based on engine RPM's, load, and throttle pedal position. When you add a chip, you change these parameters, and the computer doesn't know how to accurately compensate for the changes.

For example, a chip adds fuel throughout much of the RPM range. The result is that to maintain the same speed and/or acceleration rate that you normally have when driving, you use less throttle. The computer sees an input of less throttle, but the same RPM's and load... and goes "hey this engine is getting better fuel mileage because the throttle position is less".

And these parameters are easily confused with just minor variations in tuning. I've played around with my tunes, and was able to get my overhead display to read almost 30 MPG's. Problem was, the pedal was so damn touchy that I could barely drive it down the road.

In short, don't trust the SG for mileage calculations. The only sure-fire way to compare mileage is to do it by hand. Fill up completely to the filler neck with fuel, and drive. When you fill up again, fill it back up to the exact same fuel level, then calculate mileage. Keep doing this until you get good baselines for each setting (usually takes several tank-fulls with each chip setting before you can get good working averages for comparison).

 

My best MPG according to the lie-o-meter was 59.7. I'm down to 26.x now. .

 

HA!! Reset it when going downhill and no throttle. You can 99.9MPG!! Now thats a deal!!!!

 

I would but there ain't no hills around here. lol

 

I'd be very wary of that number. You really have to run the same course multiple times to determine your true fuel economy. Any kind of elevation change will make a HUGE difference. It is less than 400ft change from home to work, in my commuter car I get 45MPG on the way there and about 29 on the way home. Even long distance, there is a 1200ft difference between my house and my parents house (400mi each way)...there is about a 2MPG difference coming and going.

 

Oh, I understand. But as a direct comparrison, it gives you a way to evaluate your driving. I just did a fill-up and will be able to compare the 60 econo (actual 14 MPG average) against the 60 tow.(filled 'er up to 4" from the spout)

 

Got a chance to do a mileage check between the DP F5 60 econo and 60 tow(which showed 23 MPH average on the scan gauge II). The mileage were pretty much identical. The only difference I could tell was the shift point of the 60 tow were 2 MPH higher at city acceleration.

Sooooo. I guess the 60 tow really fools the Scan Gauge II