Someone may come around with some tach info for you (to get it working all of the time). Optimum RPM is only limited by your pocketbook (gas mileage). The engine has a govener so you can't overrev it. That C6 is going to hurt your mileage (no overdrive).
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92 F350 XLT Crewcab dually, 204K miles ATS turbo, 3 inch exhaust, DPS IP & Stage 1 injectors, Holly Red pump, K&N, E40D, aux cooler, A-pillar guages, 410 limited-slip rear, Rancho 9000s, towing package, full running boards, mud flaps, 94' Ford (Alcoa) aluminum wheels, Predator camper shell, 200 watts of Sony/Boston Acoustics! Complete engine rebuild at 176k miles. Ford reman E4OD at 204k miles.
2001 Komfort 26FS My Truck
What size tires and what rear end gear ratio do you have?
RPM is goverened at 3300 rpm. With an auto trans,265/75's, and 3.55 rear end i run about 1500-1600 doing 60. 75 gets me about 2100. This is with an e4od, your numbers will be higher with a C6.
2900 at 60 is screaming. I'd try to fit the biggest tires possible, and look into gear reduction. Althought the motor is governed at 3300 (3800 for mine), it is still hard on it. Your truck will probably get half the mileage as it would at around 2200 or so.
Diesels make their torque much lower in RPMs than gas motors- ours start coming on at 1600 and the curve is completely falling off at anything past 2700RPM or so.
Vehicles usually get their best fuel economy when towing at or around their torque peak. I'm not sure, but I'd venture to say for our trucks that magic RPM would be around 2200.
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1994 Ford F250 4x4: 7.3L IDI factory turbo, supercab longbed, E4OD *DEAD*. ZF5 swap,Dana 60 swap, GM 14 bolt rear w/ 4.10s, 4" exhaust from stock downpipe back to a 5" stack, IP maxed=1100 degrees max pulling uphill, "modified" wastegate=11psi max,99+ F450SD cab/chassis leaf springs in rear
--motor/trans sold--
2000 VW Jetta TDI = 48+mpg
1997 Dodge 3500: 2WD Cab & Chassis, 12V Cummins, 47RE Automatic, Dana 80, 194,000mi. Parting out.
1989 12V VE Cummins out of Chevy C60? at the machine shop...going into the Ford.
Torque peak on these IDI's is 1400.. But I have been running there and that is 50mph and my mileage seems to drop a little for some reason. I know that rule works good on my dodge cummins though, max tq is at 1600 and it revs so high that I get 21mpg on the highway doing 70 and 23mpg in the city. Revs way too high. Can't figure out why the ford likes higher rpm's though.
I would like to cruise at 2k but I would get run over, 55 mph with 4:10's and 255's. Towing up a hill I run it at 2,700-2,800. I need to keep it 2k and above for the flats, towing 5k.
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94 IDI Turbo 5 SPD Crew Cab, 252K, new paint, 35 12.50 BFG, Big ARSS Stereo
2003 Excursion E.B. V-10
(http://www.alaskancamper.com/)
My 90 7.3 idi E4OD 4.10 rear 235/85/16 OEM tires. At 2200 65mph I get 17.5 mpg. With a C6 and a 4.10 you are gonna run 500 rpm higher, and with those small tires you have even higher.
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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
My 90 7.3 idi E4OD 4.10 rear 235/85/16 OEM tires. At 2200 65mph I get 17.5 mpg. With a C6 and a 4.10 you are gonna run 500 rpm higher, and with those small tires you have even higher.
My ford being lugged through town and kept around 55mph on the ride home gets 12mpg. I am sick of getting such low numbers so that is why I am done with this engine and a cummins is going in. Ticks me off seeing my dodge never get below 20 yet the ford being 1000lbs lighter can't get anywhere near that. I think my TC has a lot to do with it though too, I had the trans rebuilt and ever since it seems like they used a 4 banger TC because it pretty much just free revs up to above 2000 and barely gets anywhere. I put in the lockup switch so now I just wait till I hear it hit second and then I lock it up so I might get somewhere. Converting it to a 5spd one of these days.
You don't have a TC out of a 4 banger, they just most likely installed an aftermarket one made for a gasser, with a higher stall speed. That's judging by the sound of it, anyways. If it takes higher RPMs to move the truck, it has a higher stall.
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1994 Ford F250 4x4: 7.3L IDI factory turbo, supercab longbed, E4OD *DEAD*. ZF5 swap,Dana 60 swap, GM 14 bolt rear w/ 4.10s, 4" exhaust from stock downpipe back to a 5" stack, IP maxed=1100 degrees max pulling uphill, "modified" wastegate=11psi max,99+ F450SD cab/chassis leaf springs in rear
--motor/trans sold--
2000 VW Jetta TDI = 48+mpg
1997 Dodge 3500: 2WD Cab & Chassis, 12V Cummins, 47RE Automatic, Dana 80, 194,000mi. Parting out.
1989 12V VE Cummins out of Chevy C60? at the machine shop...going into the Ford.
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