Big problems with 6.2 gmc v8

[rhine9]

Hi, I am experiencing big problems with my land rover 90 6.2 v8 gmc fitted with a Santana box.

I'm shocked by its poor performance!, I only brought it as it was suppose to pull like a train at speed, yet I can tell no difference at all between this and my other land rover 90 tdt 200, with a 3ton trailer on the back it still dies up a hill exactly the same as the 200tdi yet its a 6.2 v8 with 300lbs of torque and 160bhp.

I just can not understand this!, has anyone got any information or know anything I can try, as surely this can not be right?

Would appreciate any help at all guys.
Thanks very much

[roverpwr]

The GMC/Detriot Diesel designed 6.2L was never designed as a power house like todays cummins and ford/navistar power stroke diesels. Even in the light half ton chevy and gmc trucks it only had the power of a factory tuned 350 v8 gas engine, but with better fuel economy. You can get a turbo kit from Gale Banks for it, but it will never be a power monster without major beefing up of the lower end bearings and head work. You can have the injector pump timing checked by a reputable diesel shop to see if its up to spec, as well as having the injectors themselves "pop" tested. If the timing is off, injector pump is worn or injectors themselves are worn, it will make the engine really have no power. I just wish I had a 200 or 300 diesel in my NAS spec 96 Discovery, I hate this 16.5mpg I get. Cheers Mike

[57loboy]

I'd had a couple of GM diesels over time and the other thing to consider is the gearing of the box and axles need to be in line with the torque/power band of the GM 6.2 diesel. If your conversion project didn't take this into account, I am not surprised you are disappointed.
My '83 4x4 Blazer with 6.2 had a 3spd auto and 3.73 gears in it. Once in the power band, it did pull like a train, but wasn't a 0-60 terror. Then again, what trucks are?

[Supernatural]

Originally Posted by roverpwr

The GMC/Detriot Diesel designed 6.2L was never designed as a power house

This engine was not produced by GM. It was designed in Lima Ohio by a completely different company.

[afirover]

and or dirt cheap now

[XtremeMarine]

I agree with the gearing posting. You need to see what the final gear ratio in the santana box is. And then look at your differential gearing. You could be way off for your powerband.

[Alak]

Most diesel trucks round these parts run a 3.73 to 4.30 rear end depending on the transmission. I had a 3/4 Chevy with an Allison transmission on the Duramax and it had a 4.30 Rear End. It would pull an 23 foot travel trailer loaded with gear AND a 21 foot flairstack (can pull two trailers here). Top speed was about 80 MPH empty if i recall. It didnt even hit the governor. But I wouldn't recommend that truck to my enemies.

[ArmyRover]

I think the OP may not be checking this as it's a year old lol


Geez I'm distracted by looking at series porn and still noticed that