#1 permalink
Senior Member
Join Date: Mar 2007
Location: Delphos, Ohio
Posts: 664
Tops RPM 7.3 IDI
What is the top RPM limit for these 90 7.3 IDIs [img]/ubbthreads/images/graemlins/shrug.gif[/img] My 67 GMC bus with a Detroit had a top limit of 2200 RPM at 70 MPH w/V730 auto. GM suggested they run at 1800. That was fast enough for me, w/26000 lb bus. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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99.5 F350 XLT Lariat 4X4 AT 4.10 DW CC LB Centurion conversion Garret Turbo Radio SD & Tape 126,700 03/08 Strictly stock. Build date 03/99
Rebuilding engine. 92 F350 7.3 IDI CC LB 2WD Banks turbo US Gear O/U
1990 F350 XLT Lariat 7.3L IDI E4OD Dually 280K+ 2WD
Reman Promar Long Block 11/07
Reman IP - New Delphi Injectors -New Beru GP's 07/07 New radiator & hoses New WP
Dual Exhaust 3"X18" resonators frnt. of rear wheels
Soup bowl gone, 4" intake W/AZ filter
Cobra CB W/Weather Interrupt - Dual Trucker Antenna's
Blk. Grill W/Brush Guards - Fog lights - Rally driving Lights. GN 20K & Reese 16K 5er hitch
http://community.webshots.com/user/oldbull8?
Formally OLDBULL
Toys: 1984 Coachmen Leprechaun F350 Chassis 460CID 92K miles.
30 ft. Jayco Jay Designer 5th wheel.
Have AutoEnginuity W/Ford enhanced. Lima OH area.
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#2 permalink
Senior Member
Join Date: Dec 2001
Location: Claremore, Oklahoma Good Ole US of A
Posts: 4,321
Re: Tops RPM 7.3 IDI
IIRC, the engine is governed out at 3700rpm. Mine, when loaded to the gills, likes 3000-3200rpm. EGTs and water/coolant temps stay managable. Coolant temps start rising FAST if I let it drop to less than 2600rpm. [img]/ubbthreads/images/graemlins/smokin.gif[/img]Okiegringo
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<font color="red">
1987 F350, 4X4, Crew Cab, DRW, w/'91 7.3 TURBO-CHARGED BY ATS, no-Wastegate(Turbo rebuilt by me 7/2005) </font>, <font color="blue">
E4OD Auto, Aux Trans Cooler w/12" fan, w/Baumann Programable Trans Computer-12/05 </font>, Rebuilt Injection Pump-2/03, Electric Fuel Pump, Coolant Filter, "BajaGringo Block Drains, 5-Row Radiator Core-9/04, 2 New Plastic Fuel Tanks w/new Sending Units/Pickups, Fuel Filler Neck Mods, Air Ram Intake, Air-Lift SuperDuty AirBags with Smart Lift Auto Leveling-7/2005
<font color="blue">Link to Photo of "OkieGringo Idler Pulley" </font>
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#3 permalink
Senior Member
Join Date: Dec 2006
Location: Northwest Indiana
Posts: 1,058
Re: Tops RPM 7.3 IDI
The tag on the injection pumps I've seen (3 or 4 of them) all say they're governed at 3300 rpm.
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#4 permalink
Senior Member
Join Date: Mar 2007
Location: Delphos, Ohio
Posts: 664
Re: Tops RPM 7.3 IDI
Thanks for the info guys. Just didn't want to overspeed this old clunker. [img]/ubbthreads/images/graemlins/vulnerable.gif[/img]
__________________
99.5 F350 XLT Lariat 4X4 AT 4.10 DW CC LB Centurion conversion Garret Turbo Radio SD & Tape 126,700 03/08 Strictly stock. Build date 03/99
Rebuilding engine. 92 F350 7.3 IDI CC LB 2WD Banks turbo US Gear O/U
1990 F350 XLT Lariat 7.3L IDI E4OD Dually 280K+ 2WD
Reman Promar Long Block 11/07
Reman IP - New Delphi Injectors -New Beru GP's 07/07 New radiator & hoses New WP
Dual Exhaust 3"X18" resonators frnt. of rear wheels
Soup bowl gone, 4" intake W/AZ filter
Cobra CB W/Weather Interrupt - Dual Trucker Antenna's
Blk. Grill W/Brush Guards - Fog lights - Rally driving Lights. GN 20K & Reese 16K 5er hitch
http://community.webshots.com/user/oldbull8?
Formally OLDBULL
Toys: 1984 Coachmen Leprechaun F350 Chassis 460CID 92K miles.
30 ft. Jayco Jay Designer 5th wheel.
Have AutoEnginuity W/Ford enhanced. Lima OH area.
My mind works lightening fast.
One flash and it's gone.
#5 permalink
Junior Member
Join Date: May 2007
Location: tampa,FloriDUH
Posts: 10
Re: Tops RPM 7.3 IDI
i was kinda wondering about those revs too, i know i tuned my '05 duramax to spin 4600 fueld, and it hauled butt.but they are balenced to spin way up there un-fueld (grade braking)
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#6 permalink
Senior Member
Join Date: Aug 2002
Location: near Cleveland, Ohio
Posts: 5,224
Re: Tops RPM 7.3 IDI
The engine is governed, so you can't overspeed it if the governor is working properly. Low geared trucks will run right on the governed RPM at highway speeds (My international does at 66 mph).
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#7 permalink
Member
Join Date: Jun 2006
Location: Valdosta, GA
Posts: 83
Re: Tops RPM 7.3 IDI
I was afraid of that too. I always keep mine under 2800 or so and didn't run over 70 MPH at 2200 for fear of over-revving. I guess I can open er up and let it go eh?
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#8 permalink
Senior Member
Join Date: Aug 2003
Location: Sellersville Pa
Posts: 1,022
Re: Tops RPM 7.3 IDI
if they are manual u can overrev by downshifting early.
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