Quote:
Originally Posted by Booyah45828
Sounds like a great work around. And as you said, you can fine tune it with the adjustable switch.
I assume you tested this and have logged some miles? Are you pleased? Did it downshift properly going up a grade.
Kudos for all of this, and for sticking it out for a solution!
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I've not put miles on it. That's the next step.
We did test it.
Tests & Results:
Standing start - Throttle up normally to get the turbo spinning, then pretty quick but gradual advancing of the throttle until to the floor.
1st - 2600rpm shift into 2nd at 2450
2nd - 2450 - 2550 shift into 3rd to about 2200
3rd - 2200 - 2500 shift into 4th to about 1800
Stayed in it's power range really well off the line.
Starting at 40mph - Pedal to the metal, no response because boost is too low and took longer to wind up the turbo. Better solution was to gradually advance the throttle to start to spin the turbo, which only took a few seconds, then it took off in similar fashion to the standing start.
60mph cruise on flat - No downshifting required or expected.
Climbing a steep grade - My old ugly bus was stuck behind a bunch of new "SLOW" cars that think they are the only ones on the road (I'm a school bus driver for work, so my fuse for idiot drivers is short), but I was going 45mph on the ramp from one freeway to another and it revved right up to 55mph (again, slow cars in front). At that speed it can't continue to pull, the boost pressure drops and I manually downshifted into 3rd at about 1600rpm (normally I would do this at 1800 to not strain the tranny, but I wanted to see what it would do).
I had tested this one time before with open road, same grade, attacked it at I think 60mph and it pulled it at 50mph at somewhere around 2250 rpm.
Hybrid Mode:
On grades (several around me in the PNW) my plan is to drive by my RPMs and EGT, oil and tranny temps, which will include manually downshifting to maintain engine/tranny safe numbers.
Since the bus was not designed for those types of situations, and I put shorter (5.11 to 4.10) rear end gears, so I'm aware of needing to perform a hybrid manual/automatic shifting in my bus.
Now that it is able to perform properly, I'm going to be pushing it farther and a bit harder locally to increase my comfort in taking it from Seattle to the foothills of the Sierras this Summer.
I am planning on adding auxiliary oil and tranny coolers. My bus, my dog and I all work best in mild temperatures.