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My new to me 6.5 L TD motorhome

Did you climb under there yet to look at the exhaust routing yet, Jody? I know I was the one on his back on the dealer's parking lot checking things out under the chassis, but you really have to check out that trombone inspired exhaust routing. Should be more than enough room to swap out the 3" exhaust for a 4" and take out that "U" bend and the two tight 90's and replace it with one 90. Also, plenty of room to mount an auxiliary fuel tank on the passenger side up in the frame rails. With a factory 3" diameter straight shot to the filter cold air ram intake behind the front grill, about the only intake mod would be to replace the paper panel filter element with something that flows better like a K&N or dry media OEM replacement. An intercooler (there's almost a foot and a half from the A/C condenser to the grill, if only our P/U's had that much room) would be a good addition for power/reliability and easy to plumb, too.
 
It has a panel filter? Is is really big or just like the pre-97 filter boxes? On exhaust that long, you will really drop backpressure by upgrading to 4" pipe.
 
It's the stock '94-'97 air box mounted in front of and to the right of the turbo, turned 90 from stock mounting configuration so it's straight in/out air flow with a custom tube/silicone coupler between the airbox and turbo intake. No CDR, just a vent tube that goes up over the valve cover, over the bell housing, and dumps out on the driver's side by the tranny pan. There's a lot more room in the engine bay of a P-series chassis than a pickup. Turbo is mounted on pass side, but appears to be mounted lower and the out let is clocked up about 30* and the upper intake manifold looks like a pickup's, except there is an extension cast as part of the manifold that angles down 30* where the silicone coupler would be on a pickup. Don't know what it has on it for a turbo, it may not be a GM4-8, could be a Holset. Jody, I'm sure, will investigate further and we'll know a lot more about the motor once he runs the chassis S/N. The exhaust run isn't that long, the wheelbase of the chassis is no longer than a crewcab longbed P/U, and the exhaust side dumps a couple of feet in front of the rear tires on the driver's side (look carefully at the picture in Jody's post, you can see the exhaust).
 
Yes, It is a flat filter. By measuring the best that I could quickly, the filter housing is about 8 in X 18 in. The current exhaust comes out in front of the DS rear wheel and as Husker says, it looks like the exhaust fabricator had some extra piping and time, because it looks like a trombone under there, with all the bends, switch backs and change of directions.

I'll get some pix and start a new thread here right directly. Especially the engine. there are some interesting things that are a little different than our trucks. :???:
 
Here's what I found about what I have, today.
The P30 chassis is listed under a company called Workhorse. I had to go to th local bus/motorcoach/RV dealer/service business. They were able to look up the VIN and give me some info that was helpful.

Model # CP31432

GVWR- 14800

Engine- L65 GM 6.5 L Turbo HO

Fuel tank- NN4 60 gal

Transmission- MT1 4 spd auto 4L80-E

Alternator- KW2 124 amp

Rear axel- 005 4.56 Ratio

Aux Trans cooler V14

Eng Oil Cooling system- KC4

4 Whl Disc Brakes- JF9

Tire size- 225/70R19.5/F

These are the basics. There will be pix of the engine bay soon.
 
ooh, a factory 124 amp alternator. And the HD 4.56 gears with skinny tires. I thought the tires looked a little small. If you have plenty of power you might consider just a tad taller tires for easier interstate speeds.

I suppose its OBDII?
 
jrsavoie said:
I wouldn't up the gear ratio with bigger tires. Might want to pull a boat or trailer sometime.
Click to expand...

Well, thats why I said if its got more than enough power ;) I was thinking like 34" tall tires, not much taller, but drop cruising RPM by 100-200.

As long as you can get going, towing in 3rd gear, locked up TC, would be alright if you needed more power to get up a hill.
 
They do that to raise the weight of the tire going 19.5" and then raise the gear ratio to counter ther effect of the larger 19.5 tires, thus keeping the overall ratio the same as a 4.10 w/ 16" stock tires.
 
His tires aren't really taller than some stock 4.10s with 16" wheels that came with 265/75/16. So he would still have more grunt with those 4.56 gears than someone with 4.10 gears. Even people with 3.73 get as tall as 35" tires, so 34" on the motor home with 4.56 gears should still be good, would be less than 1" more ride height. Common tire would be 8R19.5, which when installed will be about 33.5" tall, about 1.5" taller than the 225/70s he has.
 
Motor Home MPG?

What MPG did you get on the return trip with the new rig?

3bals said:
Here's what I found about what I have, today.
The P30 chassis is listed under a company called Workhorse. I had to go to th local bus/motorcoach/RV dealer/service business. They were able to look up the VIN and give me some info that was helpful.

Model # CP31432

GVWR- 14800

Engine- L65 GM 6.5 L Turbo HO

Fuel tank- NN4 60 gal

Transmission- MT1 4 spd auto 4L80-E

Alternator- KW2 124 amp

Rear axel- 005 4.56 Ratio

Aux Trans cooler V14

Eng Oil Cooling system- KC4

4 Whl Disc Brakes- JF9

Tire size- 225/70R19.5/F

These are the basics. There will be pix of the engine bay soon.
Click to expand...

I agree with the pics where are they!!!
 
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