I have a stupid question, but here goes.
Why does the ford diesels have a wastegate built in them when the The big trucks do not have wastegates?

 

Sleeve bearing turbo. Nuff said.

 

Bowdown is right on the money.

Nut

 

the commercial trucks do have waste gated turbos

 

almost all of the OTR trucks on the road have sleeve bearings. the sleeve bearings may not spool as fast, but they are 10-25 times more durable than a ball bearing. im not dissing ball bearing cartridges (they are superior in their aspect) but for trucks that can go 1,000,000+ miles, a ball bearing cartridge will have to be replaced likely every 200,000 miles. it is a proven fact that sleeve bearings run alot longer than an equivalent ball bearing turbo. the shafts on these turbos are about the size of a grown man's pinky. they are not pencil-sized like the turbos on our trucks.

anyway, the stock turbine housing on our trucks is .84 A/R. it gives good spoolup for city driving at the expense of top-end flow. the van (E-series) turbos have a 1.15 housing, that is non-wastegated. there is simply not enough room under that little-azz hood for a big wastegate canister to hang back there. upgrading the turbine housing to a larger one (like i did) will let the engine breathe through the turbo alot easier, and it lowers backpressure. the purpose of the wastegate is to regulate exhaust backpressure between the engine and turbo, to prevent excessive backpressure that can damage the turbo and engine itself. plus it hurts efficiency.

the OTR trucks mostly do not have wastegates, because they have very high flow turbochargers that take a while to spool up, but when they get spooled up, they are good to run 30 psi across the country

 

So switching to a van turbo will net some power and lower EGT's? BTW, My wastegate's been disconnected for 3 tanks of gas and I've noticed no mileage difference. I have noticed a little more useable boost though.....

Why do these trucks leave you wanting about a foot more of throttle pedal travel!?

 

it's probably because you are still running a stock tune. if you were to run around on 100hp, you would only floor it when you wanted to make smoke. you blow past the speedlimit sooo fast that it's almost impossible to use all of the pedal.

 

bilder12, The trucks that I have driven never had a wastegate,(Kenworth,Peterbuilt,Frightliner Ect).In fact everytime I had the trucks worked on and they would try to turn down my truck,I can see it when my boost would not hit 30 psi when pulling a hill with 40,000 lbs on my back. The Engines that I had in the trucks were Cat, Detroit, Cummings and none of them had a wastegate on them, I know I also worked on them.Strokin_7.3 You might have hit the nail, After all Is it not a fact that the mains are a type of sleeve bearing.There are some interesting answers here.

 

It's got an old chip fron BD Diesel in it. It's around a 50-60hp tune. I liked the 85hp setting of the Predator, but I had to give that back to my buddy.

What all do I need to go with the van turbo if I should find one in a j/y? Just the plate underneath it, right? With all of the Katrina damaged stuff down here I'm bound to find one.... How can I measure one to tell if it's definitely one for sure?

Also, does the van turbo have a EBPV on it?

 

the van turbo will not have a wastegate canister on the top of the turbo. it is a golden canister. on the outlet of the turbine, there will be 3 bolts in a triangular pattern instead of the stock turbocharger which has 7, the extra bolts hold the plate that the wastegate dumps into. and if you look very close you will see a 1.15 on it instead of .84 A/R.

yes, the van turbo does have an EBPV on it, and it bolts up to the stock pedestal fine, however the outlet flange that connects to the downpipe is smaller than the one that is needed for our downpipes on the F-series trucks. look for JTharvey, he modified a van EBPV by cutting the flanges off the E and F series EBPV (you will destroy your stock turbine outlet housing doing this) and welded the F-series flange on the E-series EBPV.