Angled tonneau cover questions

[freebeard]

https://duckduckgo.com/?t=palemoon&q...ages&ia=images

[gone9]

I get the truck back from the bodyshop tomorrow at 10. then on Saturday I'll have 90ish miles to run the tonneau cover. Im not sure its worth filling up before/after both ways for such a short term trip.

I'll be installed an billet aluminum wheel with drastic changes in the fins for a faster spool time, a high flow outlet, and about 5psi boost. I don't think it will help fuel economy but I bought it before the ecomodder hobby became more realistic.

According to Big Dave the exhaust back pressure delete will help in the winter at least. Its a little butterfly valve that restricts air flow to promote warm ups but its constantly prone to failing (not opening/closing all the way) and causing an oil leak. so it may be small but: less throttle, faster spool times, reduced egts, free-er flow should help even if its ever so small lol. I'll post pics.

[gone9]

Got truck back on Thursday and double checked all fluids and installed the tonneau cover. Won’t be very accurate for measurements this tank but any improvement above 15 will be nice. Been having a lot of town lately but in about a week almost 2k miles 90% freeway of testing

[gumby79]

a test loop is of~100 mi each way same 2 pumps at each end is whst I do for testing . I have found a distinct 2mpg non verable difference North Vs south.

[gumby79]

a test loop is of~100 mi each way same 2 pumps at each end is whst I do for testing . I have found a distinct 2mpg non verable difference North Vs south. +

[gone9]

Originally Posted by gumby79

a test loop is of~100 mi each way same 2 pumps at each end is whst I do for testing . I have found a distinct 2mpg non verable difference North Vs south. +

Unfortunately my total commute to work is under 30 miles and about 50% city. Once a week I drive about 102 miles (Im taking night classes in sacramento). but the holiday brakes removes the 102 miles trip until Jan 4th lol.

I leave this weekend though around 0-dark-30 and looking forward to hit. Plus drove the truck this morning without the exhaustbackpressure valve and wow! brought back all the performance....

I attached a picture of the little outlet on the exhaust side of the turbo charger. The little valve is a source of oil leaks with a $200 rebuild kit and really reduces economy of the 7.3l powerstrokes until warmed up. (not worth the warm up time, I never noticed it reduce the time at all).

[Big Dave]

Yup. You found it.

My EBPV would clog up and run in "warm-up" mode from September to April.

Like running with an exhaust brake. Its why so many diesel pickups get lower MPG in the winter (over and above the denser cold air).

In fact some guys have rigged them up for manual control and used them as cheap and dirty exhaust brakes. Very handy retarding that trailer down a hill and much cheaper (if less reliable) than commercial exhaust brakes.

Downside: It take 4-5 miles for the truck to warm up enough for the heater to pickup.

[gone9]

Removing the EBPV made cold driving so much better... my chip has a no start and high idle mode in addition to various tunes for towing, driving etc.

The high idle and no ebpv made it much more enjoyable lol.

Have a confirmed source on air dam material too. Soon as I’m back from Idaho I’ll get it. He can cut and drill it for me too. So getting excited. Only day two or tonneau cover too.

[gone9]

Well I didn’t plan on the winter blend of diesel being so bad.

First fuel up in Klamath Falls Oregon was 17 mpg, second I’ll up in Biggs Oregon was 17.291, third in Spokane WA was 16.7 and I never went over 70 mph. And even had a good 100+ mike section of under 50mph because of ice/snow on the roads. It was around 30-20 in Oregon and it’s 12 degrees right now in Sandpoint Idaho.

I know they cut diesel differently in the winter but dang. I was hoping for a solid 18 at least lol. Tonneau cover did very well and this was only after driving for about 12 hrs.

[gumby79]

Wintry mix will penalize mpg. Wet roads cause increases in tire slip, reducing mpg. Had the wether been cooperative you may have hit your 18mpg goal.
How did hwy97 compare to I-5?

Big Dave , would that flap valve bolt to a Hx35/40 turbo?