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Why did Ford make the van turbo different from the truck turbo? Why no wastegate? Just wondering. Thanks.
Why is the Van turbo different?
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The Van turbo had a much larger exhaust side and flows better than the PU unit. There are some venders that have a kit to fit your PU down pipe to the Van turbo. I ran the van turbo right up to 32lbs of intake pressure and right out of its map before switching out. The Van turbo is a big improvement over the PU, especially if you want to keep your foot in it longer. Lower egt's with bigger exhaust housing.
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What kind of boost does the van get? Can we just keep the wastegate close and expect the same boost level on a F250?
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Boost levels with a van turbo will probably drop a bit, but the turbo is operating more efficiently, so your power should actually go up, even with less boost.
Keeping the wastegate closed on the PU turbo will net higher boost numbers due to the smaller exhaust housing, but that's not always good. At boost levels above 25 psi or so (I beleve it's 25 psi), you have moved out of the map of the compressor wheel and you are beginning to superheat the air. More boost does make more power, but hotter makes less power. And, in the case of the stock turbo at elevated boost levels, that heat loses more power than the increased boost gains.
What kind of boost does the van get? Can we just keep the wastegate close and expect the same boost level on a F250?
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Boost levels with a van turbo will probably drop a bit, but the turbo is operating more efficiently, so your power should actually go up, even with less boost.
Keeping the wastegate closed on the PU turbo will net higher boost numbers due to the smaller exhaust housing, but that's not always good. At boost levels above 25 psi or so (I beleve it's 25 psi), you have moved out of the map of the compressor wheel and you are beginning to superheat the air. More boost does make more power, but hotter makes less power. And, in the case of the stock turbo at elevated boost levels, that heat loses more power than the increased boost gains.
Joined
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5,467 Posts
[ QUOTE ]
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What kind of boost does the van get? Can we just keep the wastegate close and expect the same boost level on a F250?
[/ QUOTE ]
Boost levels with a van turbo will probably drop a bit, but the turbo is operating more efficiently, so your power should actually go up, even with less boost.
Keeping the wastegate closed on the PU turbo will net higher boost numbers due to the smaller exhaust housing, but that's not always good. At boost levels above 25 psi or so (I beleve it's 25 psi), you have moved out of the map of the compressor wheel and you are beginning to superheat the air. More boost does make more power, but hotter makes less power. And, in the case of the stock turbo at elevated boost levels, that heat loses more power than the increased boost gains.
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It has been proved a few times with dyno results and track E.T.'s that pushing boost up to 30 psi will still net MORE power than if held at 25 psi...and I'm talking with the stock turbo...it's when pushing past 30 when the superheating argument srarts to show. The 25psi limit is a more of a mechanical limit of the thrust bearing.
Hammer
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What kind of boost does the van get? Can we just keep the wastegate close and expect the same boost level on a F250?
[/ QUOTE ]
Boost levels with a van turbo will probably drop a bit, but the turbo is operating more efficiently, so your power should actually go up, even with less boost.
Keeping the wastegate closed on the PU turbo will net higher boost numbers due to the smaller exhaust housing, but that's not always good. At boost levels above 25 psi or so (I beleve it's 25 psi), you have moved out of the map of the compressor wheel and you are beginning to superheat the air. More boost does make more power, but hotter makes less power. And, in the case of the stock turbo at elevated boost levels, that heat loses more power than the increased boost gains.
[/ QUOTE ]
It has been proved a few times with dyno results and track E.T.'s that pushing boost up to 30 psi will still net MORE power than if held at 25 psi...and I'm talking with the stock turbo...it's when pushing past 30 when the superheating argument srarts to show. The 25psi limit is a more of a mechanical limit of the thrust bearing.
Hammer
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149 Posts
Will the van turbo spool up as quick as the stock turbo or does it lag?
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Will the van turbo spool up as quick as the stock turbo or does it lag?
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it has some lag.
Hammer
Will the van turbo spool up as quick as the stock turbo or does it lag?
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it has some lag.
Hammer
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149 Posts
Hammer,
Is the van turbo upgrade worthwhile then if I go to big oil?
Are there any problems with a non wastegated turbo on our trucks?
Is the van turbo upgrade worthwhile then if I go to big oil?
Are there any problems with a non wastegated turbo on our trucks?
I just put one on a truck yesterday with a ww, the spool up was better than I figured it would be. It seems the initial smoke you get is just a tad darker, the sucker is real smooth. The truck did have Twildman programs providing the fuel and a PI converter to help get it rolling. This was a huge improvement over the stock turbo. The ats and ww made the same diff on my own rig, I just cant imagine how fast that sucker is spinning though.
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10,487 Posts
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The 99 and up vans use the same turbo setup as the 94-97 trucks with no intercooler.
[/ QUOTE ] This is not true. The van turbo has a larger exhaust housing, The compressor side is the same size as the 99.5 and up Pickup turbos. The EARLY 99s had the same/similar turbos as the 94-97 trucks.
I am running the later model van turbo with the ww and ATS housing. I love it! With a Cale Thompson (BTS) burn in the chip it pulls very hard all the way thru the rpm range! SOTP dyno likes! No real dyno runs yet.
Going down to BTS to get the trannys swapped. My 03 stock had 12k behind it with the trailer and my 99. It down shifed and reved way up on some of the hills on I-44 toward Springfield, MO. And on the hills on Rt.65 south. Coming home, it down shifted on 65 a couple times. 44 it NEVER shifted, pulled up those hills with the cruise set @70. Just powered up with that BTS TC locked and the torque I was making!! GOTTA LOVE IT!
The 99 and up vans use the same turbo setup as the 94-97 trucks with no intercooler.
[/ QUOTE ] This is not true. The van turbo has a larger exhaust housing, The compressor side is the same size as the 99.5 and up Pickup turbos. The EARLY 99s had the same/similar turbos as the 94-97 trucks.
I am running the later model van turbo with the ww and ATS housing. I love it! With a Cale Thompson (BTS) burn in the chip it pulls very hard all the way thru the rpm range! SOTP dyno likes! No real dyno runs yet.
Going down to BTS to get the trannys swapped. My 03 stock had 12k behind it with the trailer and my 99. It down shifed and reved way up on some of the hills on I-44 toward Springfield, MO. And on the hills on Rt.65 south. Coming home, it down shifted on 65 a couple times. 44 it NEVER shifted, pulled up those hills with the cruise set @70. Just powered up with that BTS TC locked and the torque I was making!! GOTTA LOVE IT!
Joined
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5,467 Posts
[ QUOTE ]
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The 99 and up vans use the same turbo setup as the 94-97 trucks with no intercooler.
[/ QUOTE ] This is not true. The van turbo has a larger exhaust housing, The compressor side is the same size as the 99.5 and up Pickup turbos. The EARLY 99s had the same/similar turbos as the 94-97 trucks.
I am running the later model van turbo with the ww and ATS housing. I love it! With a Cale Thompson (BTS) burn in the chip it pulls very hard all the way thru the rpm range! SOTP dyno likes! No real dyno runs yet.
Going down to BTS to get the trannys swapped. My 03 stock had 12k behind it with the trailer and my 99. It down shifed and reved way up on some of the hills on I-44 toward Springfield, MO. And on the hills on Rt.65 south. Coming home, it down shifted on 65 a couple times. 44 it NEVER shifted, pulled up those hills with the cruise set @70. Just powered up with that BTS TC locked and the torque I was making!! GOTTA LOVE IT!
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JIM...the 94-97 OBS trucks use a NON-wastegated 1.15 exhaust housing just like the van turbo uses a NON-wastegated 1.15 exhaust housing. They are not identical due to the way they mount, but flow wise, the van turbo and OBS turbo are pretty much identical.
Hammer
[ QUOTE ]
The 99 and up vans use the same turbo setup as the 94-97 trucks with no intercooler.
[/ QUOTE ] This is not true. The van turbo has a larger exhaust housing, The compressor side is the same size as the 99.5 and up Pickup turbos. The EARLY 99s had the same/similar turbos as the 94-97 trucks.
I am running the later model van turbo with the ww and ATS housing. I love it! With a Cale Thompson (BTS) burn in the chip it pulls very hard all the way thru the rpm range! SOTP dyno likes! No real dyno runs yet.
Going down to BTS to get the trannys swapped. My 03 stock had 12k behind it with the trailer and my 99. It down shifed and reved way up on some of the hills on I-44 toward Springfield, MO. And on the hills on Rt.65 south. Coming home, it down shifted on 65 a couple times. 44 it NEVER shifted, pulled up those hills with the cruise set @70. Just powered up with that BTS TC locked and the torque I was making!! GOTTA LOVE IT!
[/ QUOTE ]
JIM...the 94-97 OBS trucks use a NON-wastegated 1.15 exhaust housing just like the van turbo uses a NON-wastegated 1.15 exhaust housing. They are not identical due to the way they mount, but flow wise, the van turbo and OBS turbo are pretty much identical.
Hammer
Joined
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5,467 Posts
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The van turbo has a larger exhaust housing
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No it doesn't.
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Yes it does.
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Sorry, but 444-D is correct, the van turbo and the OBS turbos both use NON-wastegated 1.15 exhaust hosuings.
Hammer
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The van turbo has a larger exhaust housing
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No it doesn't.
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Yes it does.
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Sorry, but 444-D is correct, the van turbo and the OBS turbos both use NON-wastegated 1.15 exhaust hosuings.
Hammer
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10,487 Posts
OK,, guess I am mistaken in thinking that the early 99 turbo and the 94-97 were the same. Here is an early 99 and the van turbo, exhaust housings are different. If the 94-97 have larger exhaust housings I was mistaken. Sorry!
Thanks for straightening me out on that.
I guess I am still correct in stating that the intake housings are much different from the 94-07 to the VAN turbos (Later models)...right?
Thanks for straightening me out on that.
I guess I am still correct in stating that the intake housings are much different from the 94-07 to the VAN turbos (Later models)...right?
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5,467 Posts
the OBS and early 99 SD turbos have similar compressor side.
Hammer
Hammer
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