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Thread: 6.5l Detroit vs 7.3l IDI Turbo

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    Registered User InhumaneIDI's Avatar
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    Default 6.5l Detroit vs 7.3l IDI Turbo


    Hey guys just wanted to get some opinions. I decided against a power stroke for the simple fact i don't want to spend $350 a pop on an injector job. So basically I can decide between a 1994 7.3l Idi Turbo or a 1994 Silverado 6.5l.

    I'm basically looking for a reliable engine with decent fuel economy that has at least some ability to make more power.

    Which is easier to mod etc.. and help its great thanks.

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    the 6.2/6.5 chevys aren't as bad as everyone makes them out to be as long as you take care of them. The 6.9/7.3 fords are pretty good to. Just depends on whether you like chevy or ford.

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    Registered User dieselburner94's Avatar
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    the 6.5l's are a good and strong running motor, assuming you take care of them. They have their share of downsides too, but what motor doesnt. I drive one and like it, there are also a few sites you can go to for modification parts. I did 8 new injectors, and they were about 50$ apiece. I like both engines, so like 6.5dieselman said, it basically depends on if you like ford or chevy better. If you do decide to go with the 6.5, one thing i would consider is buying an aftermarket Heat Sync PMD for the injection pump.

    My Truck-
    1994 GMC 2500 4x4
    6.5L Turbo Diesel
    K&N Cold Air Intake
    FSD Heat Sync
    #9 Fuel Resistor
    Custom dash mounted boost controller
    Custom 4" Exhaust straight pipe with dual 5" Stacks
    2004 GMC aluminum rims with HD 10ply tires
    Custom rear bumber
    Custom Headache rack
    Lots of LED lights and strobes
    Roadmaster rectangle air horns
    Boost gauge, Air PSI gauge for truck mounted air tank
    many other ad ons

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    Is getting worn out dyoung14's Avatar
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    I have never owned a 6.2 or 6.5, but i have owned quite a few 6.9 7.3 idi's and i love them there cheap and easy to work on you can get a hole set of 6.9 or 7.3 injectors for about 150 dollars from pensacola, half of what you would pay for a psd injector!
    ~David~

    "THE TOY" 1986 Ford F-250xlt lariat 4x4 t-19, 89 model dash and gauges powered by an 83 model 6.9 engine bored .020 with all gaskets copper coated, turbocharged, wasetgate unplugged,7.3 turbo pump maxxed, turbo injectors, 7.3 rockers, ram-air intake, max boost is more than anyone else. will turn the whole road black if i want it too

    Who says idi's cant make high boost?

    1995 F-350 DRW 2wd ZF5 ext. cab, 7.3 powerstroker, 6637 intake, choped exhuast

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    The One Blue Thing ameristar1's Avatar
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    I like them both, but for different reasons. Since they have the same injection system, they're cheap. The 6.2/6.5 can be had in the lighter half tons for max fuel economy if that's what you're after, but then again, putting a 6.9/7.3 in a half ton is a weekend's work away provided you have everything. Both can be modded, and the 6.2/6.5 may be a little easier to get power out of because of the cam timing and the higher rpm pump calibration. The 6.9/7.3 is better for towing; not fast stock, but reliable.

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    Using the Force! Agnem's Avatar
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    I have no strong opionion about the GM versions, but I was hanging out around one at a junkyard last weekend, and just looking at the valve cover trapped under those really long injector lines made me wrinkle my nose.
    Owner, Conestoga Diesel Injection Our family - The Moose Truck - 1983 F-250HD, The Lady Moose - 1993 F-350 CC dually, The Moosestang - 1987 Bronco (1994 7.3L IDI), The Night Moose - 1995 F-150 (1984 6.9L IDI), The Iron Moose - 1986 F-250 EC, The Moose Wagon - 2002 Excursion, The Moose GT - 2008 Mustang GT 4.6L, The Moose Lodge - 1994 Wilderness 195R Serving the IDI community since 1997! Visit http://MoosePump.com or https://www.facebook.com/ConestogaDiesel

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    The One Blue Thing ameristar1's Avatar
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    Quote Originally Posted by Agnem View Post
    I have no strong opionion about the GM versions, but I was hanging out around one at a junkyard last weekend, and just looking at the valve cover trapped under those really long injector lines made me wrinkle my nose.
    No strong opinions? I knew you had a sense of humor!

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    hmmm? towcat's Avatar
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    Quote Originally Posted by Agnem View Post
    I have no strong opionion about the GM versions, but I was hanging out around one at a junkyard last weekend, and just looking at the valve cover trapped under those really long injector lines made me wrinkle my nose.
    how ofter do you have to go under the valve cover of your IH idi?
    how often does a glow plug tip swell up and break on when attempting removal?
    betcha the second happens more often than most people care to count.
    on the GM diesel, the non-turbo model it's as simple as pulling the injector and reaching in with a pair of tweezers and pulling it out.
    1992 F350 4x2 CC 7.3 ZF5 4.10LS DRW ATS(series 093) Intercooled & Hydrostop'd......the CSS "Nostromo"
    1988 F350 4x4 SC 7.3 ZF5, GV 4.10LS DRW D60/10.25...the T-ARS "Sulaco"
    1988 F250 4x4 SC 7.3 ZF5, 3.55LS SRW 10.25/D50.....the T-ARS "Brentwood"
    1986 F350 4x4 RC 7.3 C6 4.10LS DRW D60/10.25Vulcan 876 Super Cradle
    1986 F350 4X4 RC 7.3 T-19 4.10 DRW D60/10.25 Vulcan 862 Wheel lift ARS "O'neil Forebay"
    1989 F450 4x2 RC 7.3 ZF5 5.13 D80 Century 17ft alu carrier
    1990 F450 4x2 RC 7.3 E4DOA 5.13 D80 Century 441xl wheel lift
    1985 GMC K2500 4x4 Suburban 6.5 turbo thm700 "Burb-O-matic"

    There are 3 kinds of people in this world.
    The wise, learn from the mistakes of others.
    The smart, learn from their own mistakes.
    The others, well......they just never learn.

    according to Jason Thompson, I must be one of the 15. http://www.ebay.com/itm/Ford-F250-Pr...-/171293233755
    If you are one of the 15 people left on the planet who love IDI's or just want a piece of diesel history this is the truck for you.
    For those who are interested in the impending changes for diesel trucks(with a GVWR of 14,001/lbs and above) owned and operated in Kalifornia Jan 1, 2015, please click on this link.. http://www.arb.ca.gov/msprog/onrdiesel/onrdiesel.htm (updated 9/14)

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    The One Blue Thing ameristar1's Avatar
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    Either engine can get the job done, and if you still can't decide, do what GenLightning did, and put an IDI in a Chevy; or if you go to The Diesel Page, there's a 6.5 GM diesel powered Ford ambulance that has a F250 chassis base.

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    Registered User dieselburner94's Avatar
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    for fuel economy, both motors arent bad, depending on your rear end gear ratios. The 6.5's are good on fuel, and there are some websites you can go to to look at performance upgrades, like heath diesel, or my personal favorite, ssdieselsupply.com

    My Truck-
    1994 GMC 2500 4x4
    6.5L Turbo Diesel
    K&N Cold Air Intake
    FSD Heat Sync
    #9 Fuel Resistor
    Custom dash mounted boost controller
    Custom 4" Exhaust straight pipe with dual 5" Stacks
    2004 GMC aluminum rims with HD 10ply tires
    Custom rear bumber
    Custom Headache rack
    Lots of LED lights and strobes
    Roadmaster rectangle air horns
    Boost gauge, Air PSI gauge for truck mounted air tank
    many other ad ons

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    with the chevy you can get as new as a 98 1500 or up to a 2000 2500 with the same IDI 6.5L turbo. with the ford you get a powerstroke by 94, more complicated, but more power too. with the chevy they held the same motor from like 83-98, same block just going to computer control. ford changed their diesels 3 times through the same year period. again, neither is really a bad thing, just different.

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    honestly if you're going to tow and pull the ford 6.9/7.3 would be better. they make a bit more power than the gm's. and with a turbo they are almost as good as a stock first gen powerstroke. but if you are just looking for a city driver needing fuel milage, gm is better in that department
    1991 Dodge D150 318 v8 727 auto. 3" duals sound nice-soon to be sold
    Quote Originally Posted by timothyr1014 View Post
    IDI's remind me of how I liked my women before I got maried....
    cheap, easy, and you can ride them hard for a long time before they complain
    past toys:
    1984 Chevy K20 6.2 banks turbo 4spd- looked nice in pics, not at all in person
    Old Rusty Diesel II -1983 Ford F250 6.9 N/A t19 4x4-biggest piece of ****ever made
    Ol' Blue- 1992 Chevy K2500 Silverado 350 V8 5spd
    Old Rusty Diesel I -1985 Ford F250HD 6.9turbo diesel 4x4- miss it every day
    1968 Chevy c50 327 gasser sm465 4spd-rusted away
    1969 Chevy c10 307 gasser turbo 350-too much work
    1969 Chevy c10 I-6 3 on the tree-parts truck
    2004 Honda 400ex bored .40 over-sold to gf to buy idi

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    i concur!!!
    93 b2200 F2t swap build thread sold
    92 B2600i with a 82 3.0L 5cyl 617 benz Turbo Diesel build thread
    91 b2200 fully airbagged, 4 linked, 1/2" lines, lays frame rebuild thread sold
    91 b2200 v8, toy axels, 39" tires thread sold
    96 GMC 1500 z71 4x4 6.5L turbo diesel

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    i drove my gf's parents 1999 2500 burb w/6.5 diesel and it feels like it's a bit faster than my 6.9 but it don't feel like it has anywhere near the power mine does
    1991 Dodge D150 318 v8 727 auto. 3" duals sound nice-soon to be sold
    Quote Originally Posted by timothyr1014 View Post
    IDI's remind me of how I liked my women before I got maried....
    cheap, easy, and you can ride them hard for a long time before they complain
    past toys:
    1984 Chevy K20 6.2 banks turbo 4spd- looked nice in pics, not at all in person
    Old Rusty Diesel II -1983 Ford F250 6.9 N/A t19 4x4-biggest piece of ****ever made
    Ol' Blue- 1992 Chevy K2500 Silverado 350 V8 5spd
    Old Rusty Diesel I -1985 Ford F250HD 6.9turbo diesel 4x4- miss it every day
    1968 Chevy c50 327 gasser sm465 4spd-rusted away
    1969 Chevy c10 307 gasser turbo 350-too much work
    1969 Chevy c10 I-6 3 on the tree-parts truck
    2004 Honda 400ex bored .40 over-sold to gf to buy idi

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    I have to agree with the posters above me. I've owned both. Had a 6.5 L non-turbo first starting in '98, and then I bought my first Ford around 2002, an '89 with a 7.3 IDI non-turbo.

    If you want to tow something, get the Ford, its bigger, and it generally produces a little more torque, and a little more holding power or lugging power you might call it. The best mpg I ever got with it was 17-18 mpg bobtail (with 4.10 gears, not bad!) and about 14 mpg towing. Plus, its an easy engine in my opinion to work on, and the parts are cheap. The 6.5 was my daily driver and highway machine, I could get about 25 mpg out of it (3.42 gears) and cruise at 80 mph and still get around 21-22 mpg. I loved taking trips in that thing. I drove it everywhere. It was also decent at towing, but not as great as the Ford at getting the load moving and lugging. Also a very easy engine to work on. And they both sound great! I had a 2.5" true dual rear exit exhaust w/ little super turbo mufflers on the 6.5 (music at 2000 rpm!!) and a 3" exhaust on the 7.3.

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