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6.5L Turbo Diesel 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, upgrades, cooling, fuel economy, troubleshooting and more.

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  #11  
Old 05-25-2019, 01:04 PM
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sctrailrider sctrailrider is offline
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Originally Posted by DieselDavy View Post
"Plus the cost of one that is already a diesel will probably be less than 1/2 of doing a conversion,without putting a price on your time"

That's what I'm thinking too!

Sent you a PM....
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  #12  
Old 05-26-2019, 04:23 AM
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Quote:
Originally Posted by Yukon6.2 View Post
Plus the cost of one that is already a diesel will probably be less than 1/2 of doing a conversion,without putting a price on your time
Exactly!

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Originally Posted by Linhster View Post
Vortex to mechanical 6.2 conversion
And if the main consideration is the mechanical setup rather than the electronics, just get a 2-door with a diesel and then do the conversion to mechanical injection - much less work than swapping a diesel into a non-diesel vehicle.
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  #13  
Old 05-26-2019, 10:27 AM
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Originally Posted by DieselDavy View Post
You might want to contact me. I am thinking about selling my 97 2 door Tahoe.
d
Say it ain't so!

Back to the topic... The TCM computer used behind a gas engine won't work with a diesel... The shift points will be all wrong because of how different the RPM ranges are for the two engines. Jim
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  #14  
Old 05-26-2019, 02:20 PM
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Originally Posted by More Power View Post
Say it ain't so!

Back to the topic... The TCM computer used behind a gas engine won't work with a diesel... The shift points will be all wrong because of how different the RPM ranges are for the two engines. Jim
Thank you, this was the stuff I was looking for. I think you can manipulate the shifting with some adjustment of the TPS but I could be wrong.

I have the following already:

- Tahoe
- refreshed 6.2 diesel (out of a running Humvee) with serpentine belt system
- New Torque converter with 1200 stall
- New flex plate to match
- 6.5 TD side exhaust system with crossover pipes
- Diamond Eye K4108A Turbo-Back Exhaust Kit
- Hydrobooster
- new engergy suspension motor mounts.
- hx35 clone turbo

So... I have already vested into the project. Got the 2 door from a friend but it had 206k miles on the motor. Yes, I can get all the part from a 6.5 but what the challenge in that?

And BTW, I have not seen too many 6.5TD Tahoe out there for sale, never mind the 2 door version (Beside what DieselDavy mentioned). And the ones that are for sales would need a freshened up since most of the ones I see have 200k+ miles already on it.
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Last edited by Linhster; 05-26-2019 at 02:34 PM.
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  #15  
Old 05-26-2019, 05:30 PM
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Sounds like you have your mind made up (which is OK), so power on.

You'll actually be doing two conversions, gas to Diesel, then EFI Diesel to MFI Diesel. You can do them simultaneously, but keep them as separate processes in your progress. You'll need late model 6.5L accessory brackets and components (serpentine belt system), which will bolt to the 6.2L block. Once everything is in place and the powertrain and chassis harnesses are correct, you'll need a custom 1998+ 6.5L N/A PCM and calibration to allow communication and control. The PCM is also necessary to communicate with the BCM, which runs most of the chassis components unique to the late models, including the security system (which is another can o' worms).

Quote:
Originally Posted by Linhster View Post
And BTW, I have not seen too many 6.5TD Tahoe out there for sale, never mind the 2 door version (Beside what DieselDavy mentioned). And the ones that are for sales would need a freshened up since most of the ones I see have 200k+ miles already on it.
There are no OEM 4-door Diesel Tahoe/Yukon here. All of them were either exported, or built out of country (Brazil). None were ever delivered here. If you see one, it came into the country from somewhere else, or it is a conversion.
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  #16  
Old 05-26-2019, 05:45 PM
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Also, the HX35 is too much turbo for the 6.2L. There's much discussion here about that. It's just too big for the 6.2L operating margins. If you TD it, you'll need HX30-ish size non-wastegate (Banks), or GM4/8 wastegated.
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  #17  
Old 05-27-2019, 04:35 AM
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Thank you DmaxMaverick for the insightful tips... I will definitely look more into those items you have brought up in discussion..
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