1994 7.3 turbo idi or ps? - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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post #1 of 27 (permalink) Old 12-12-2012, 05:22 PM Thread Starter
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1994 7.3 turbo idi or ps?

i just recently bought a 1994 7.3 turbo 5spd manual. ive read some places that late model 94 was really a powerstroke just w/o the badge mine is a build date of 6/29/1994. idk much about older diesels but it was a really good deal so i bought it up. so is this really a turbo or is it like the older ones where the turbo is bassically a engine ornament?
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post #2 of 27 (permalink) Old 12-12-2012, 05:51 PM
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8th character of the VIN will tell you for sure.

"M" is an IDI non turbo
"K" is an IDI turbo
"F" is a Powerstroke.

Mine is a turbo'd IDI and I can tell you the turbo isn't just eye candy.

1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
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post #3 of 27 (permalink) Old 12-13-2012, 08:01 AM Thread Starter
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ok thank you it is an F! is there a way to straight pipe it without having problems with the exhaust back pressure? can i just slap pipe in where the muffler is? also is there a way to "turn up the turbo" ?
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post #4 of 27 (permalink) Old 12-13-2012, 08:14 AM
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Your truck has the smashed downpipe, just like they did on the IDI's. You can change it out and then run straight pipe if you want. Diesel engines don't need or like back pressure.

I would change the DP and exhaust before you did anything else. If you mean getting higher boost, I don't believe there is anything you can do. You may be able to adjust the wastegate actuator and gain a pound or two.

1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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post #5 of 27 (permalink) Old 12-13-2012, 08:45 AM Thread Starter
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ok. to change that out can i use one off like a newer 7.3? like 96 97? and how do u adjust the wastegate?
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post #6 of 27 (permalink) Old 12-13-2012, 08:51 AM
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Best bet is to buy a new down pipe, and then just have your local exhaust shop build the rest. When I changed the DP on a '95 a couple of months ago I had to cut the old one in half to get it out and it's probably true with the '96 and '97. IIRC it cost the guy like $75.00 shipped.

IF your wastegate actuator has a rod that is threaded, changing the length can change the pressure it takes to open it. Can't remember off hand which way to turn it right now.


Answered on my smart phone

1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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post #7 of 27 (permalink) Old 12-13-2012, 09:30 AM Thread Starter
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got a website for that pipe?
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post #8 of 27 (permalink) Old 12-13-2012, 09:44 AM
 
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just an FYI for a "quick" identification. In 1994 the IDI came in only automatic, and PSD came in only 5spd.
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post #9 of 27 (permalink) Old 12-13-2012, 09:45 AM
 
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also. shortening that rod will increase boost.
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post #10 of 27 (permalink) Old 12-13-2012, 09:53 AM Thread Starter
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ok cool good info. mines a 5spd
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post #11 of 27 (permalink) Old 12-13-2012, 10:33 AM
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My customer bought a Bully dog DP on Amazon.


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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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post #12 of 27 (permalink) Old 12-13-2012, 02:19 PM Thread Starter
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you have to hammer out the firewall quite a bit it looks like to put in a round down pipe?
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post #13 of 27 (permalink) Old 12-13-2012, 03:20 PM
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Not a lot. I used a couple of crescent wrenches and just bent the cab seam. Took me about 20 minutes to get the clearance needed.


Answered on my smart phone

1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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post #14 of 27 (permalink) Old 12-13-2012, 04:22 PM Thread Starter
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Quote:
Originally Posted by chuckster57 View Post
Best bet is to buy a new down pipe, and then just have your local exhaust shop build the rest. When I changed the DP on a '95 a couple of months ago I had to cut the old one in half to get it out and it's probably true with the '96 and '97. IIRC it cost the guy like $75.00 shipped.

IF your wastegate actuator has a rod that is threaded, changing the length can change the pressure it takes to open it. Can't remember off hand which way to turn it right now.


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IIRC?
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post #15 of 27 (permalink) Old 12-13-2012, 05:06 PM
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Quote:
Originally Posted by CAT1150 View Post
ok. to change that out can i use one off like a newer 7.3? like 96 97? and how do u adjust the wastegate?
A 94 Powerstroke won't have a wastegate.

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