Questions
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Junior User
Joined: Nov 2008
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From: Pink Hill, North Carolina
Questions
My curiosity finally got the better of me, tried to read enough forums to answer my own questions, but failed badly. Would greatly appreciate some help please.
1 Why come there isn't a 98 PSD ?
2 Why doesn't 94.5-97 PSD turbochargers have a waste gate ?
3 Which mod do you do first the IDM (got my Digi-Key resistors today, little suckers) or the ICP ?
Thanks,
Darron
1 Why come there isn't a 98 PSD ?
2 Why doesn't 94.5-97 PSD turbochargers have a waste gate ?
3 Which mod do you do first the IDM (got my Digi-Key resistors today, little suckers) or the ICP ?
Thanks,
Darron
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
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From: Southwest Georgia
1 Why come there isn't a 98 PSD ?
2 Why doesn't 94.5-97 PSD turbochargers have a waste gate ?
3 Which mod do you do first the IDM (got my Digi-Key resistors today, little suckers) or the ICP ?
Last edited by plowhand; Dec 5, 2008 at 03:02 PM. Reason: addition
Thread Starter
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Junior User
Joined: Nov 2008
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From: Pink Hill, North Carolina
Thanks immastrokinnow and plowhand for your answers. Yeah I'm pretty familair with tractor and big rig turbos, generally the turbo can't pump enough air to hurt engine ,I guess because of the turbo's size. I was wandering why, because the later models have waste gates.
Thanks,
Darron
Thanks,
Darron
Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
The old body style trucks (OBS...95-97) do not have a wastegate because of the lack of an intercooler and the fact that the turbine housing (exhaust side) of the turbocharger is rediculously huge (by huge, I mean large A/R.....flows A LOT). The lack of an intercooler overshadows the lag that would be produced with such a large turbine housing. Therefore, to keep EGTs in check, Ford used a very high-flowing turbine housing that does not lend itself to high drive pressure.......and therefore keeps boost in check without a wastegate.
The Superduty trucks used a smaller exhaust housing that allows quicker spool-up with the intercooler. Since an intercooler was used, EGTs were less of a problem with the smaller turbine housing. But the possibility exists of overboost because of high drive pressures, so a wastegate was used to bleed it off.
The Superduty trucks used a smaller exhaust housing that allows quicker spool-up with the intercooler. Since an intercooler was used, EGTs were less of a problem with the smaller turbine housing. But the possibility exists of overboost because of high drive pressures, so a wastegate was used to bleed it off.
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From: Gladwin,Mi
The old body style trucks (OBS...95-97) do not have a wastegate because of the lack of an intercooler and the fact that the turbine housing (exhaust side) of the turbocharger is rediculously huge (by huge, I mean large A/R.....flows A LOT). The lack of an intercooler overshadows the lag that would be produced with such a large turbine housing. Therefore, to keep EGTs in check, Ford used a very high-flowing turbine housing that does not lend itself to high drive pressure.......and therefore keeps boost in check without a wastegate.
The Superduty trucks used a smaller exhaust housing that allows quicker spool-up with the intercooler. Since an intercooler was used, EGTs were less of a problem with the smaller turbine housing. But the possibility exists of overboost because of high drive pressures, so a wastegate was used to bleed it off.
The Superduty trucks used a smaller exhaust housing that allows quicker spool-up with the intercooler. Since an intercooler was used, EGTs were less of a problem with the smaller turbine housing. But the possibility exists of overboost because of high drive pressures, so a wastegate was used to bleed it off.
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From: Belair md
yup, great answer and to add to the no 98 question, there technicly was a 98 f-series. it is the 94-97 bodied trucks that were still in production and carried over to get prepped for the 99 style. then the 99 style actually came out early and is reffered to as a 98 and a half by ford fans. my 97 f250 is technicly a 98 since it has a build date of 12/97
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From: Huntsville, Tx
I thought it came with those funky 7 lug wheels...
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From: Kearney, Nebr
The old body style trucks (OBS...95-97) do not have a wastegate because of the lack of an intercooler and the fact that the turbine housing (exhaust side) of the turbocharger is rediculously huge (by huge, I mean large A/R.....flows A LOT). The lack of an intercooler overshadows the lag that would be produced with such a large turbine housing. Therefore, to keep EGTs in check, Ford used a very high-flowing turbine housing that does not lend itself to high drive pressure.......and therefore keeps boost in check without a wastegate.
The Superduty trucks used a smaller exhaust housing that allows quicker spool-up with the intercooler. Since an intercooler was used, EGTs were less of a problem with the smaller turbine housing. But the possibility exists of overboost because of high drive pressures, so a wastegate was used to bleed it off.
The Superduty trucks used a smaller exhaust housing that allows quicker spool-up with the intercooler. Since an intercooler was used, EGTs were less of a problem with the smaller turbine housing. But the possibility exists of overboost because of high drive pressures, so a wastegate was used to bleed it off.
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Junior User
Joined: Nov 2008
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From: Pink Hill, North Carolina
Thank all of you for your answers,(reps sent) saved me some reading time that I really don't have. Does anybody have idea of how much boost (ball park) the older 7.3's can stand without popping head gaskets, stretching nogging bolts and such, if you turn the fuel to it max, with no waste gate and add the intercooler mod.
Thanks,
Darron
Thanks,
Darron
Postmaster
Joined: Jan 2004
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From: Kearney, Nebr
The OBS can handle around 43-45 lbs before you blowout a gasket or stretch the studs. Adding an intercooler or a wastegate does not affect how much the studs can handle.
I think you'd be safe running 40 all day long.
The wastegate is there is relieve pressures between shifts, hard acceleration then backing off, etc. I'm pretty sure they don't open once you hit a certain lb. Blow off valves will though.
I think you'd be safe running 40 all day long.
The wastegate is there is relieve pressures between shifts, hard acceleration then backing off, etc. I'm pretty sure they don't open once you hit a certain lb. Blow off valves will though.