4jb1-t into a UBS69?

[varnz10]

Hi I used to have a 1991 early model Bighorn that had the 4jb1-t engine and while it didnt seem overly endowed with power I liked the engine, and it didnt seem that noisey to me. Any way my newer truck has an engine issue... I am wondering if a 4jb1-t would be struggling in the larger body etc of the UBS69 compared to the UBS55.. so can anyone tell me if I would get the better mileage out of the 2.8 if I was to put it in instead of a 3.1? And other than loosing the low down torque wouold there be mush other difference?

[geeves]

ubs69 is nearly 300kg heavier and generaly bigger all round. In the manual car it will probably be ok but it will be slower In the auto I wouldnt bother trying

[varnz10]

ok thanks for that. really like that performance and mileage i got out of the earlier one

[mudslinger]

more boost more fuel bigger exhaust intercooler that mite give it a bit of up and go

[Captcol]

As greeves said your performance and mileage would be severely affected by the 2.8, There is work you can do to improve the 3.1. If you are majorly concerned about about performance you could got to petrol commmodore engines etc

[geeves]

You can get good power out of the 4jb1 with fuel and timing tweeks along with big bore exhaust and maybe a bigger turbo but its mostly top end power so its not going to get you moveing from the start line that well. If economy is a issue dont consider the petrol 6s

[varnz10]

Mainly I was looking at the issue of fuel consumption.. The current engine a 3.1 is drinking like a camel.. 400 km on 70 liters if I am lucky. So I was more thinking about the 2.8 in terms of better mileage. However still didnt want to lose to much 'grunt' for towing and 4wding. So As I tried to get the truck going cheaply.. well I am now paying for that in fuel I am just going to have to spend some money on getting the engine reconditioned. Hopefully then I will get better mileage. When I had the 2.8 in my ealrier truck I was getting about 600-650km on 60 liters I would love top be able to get that sort of mileage in this truck.

By the way it is a manual.

[varnz10]

Lol Greeves Just reread your comment... as its a Diesel I am not expecting to break any records on the off the line.. Just would like to have it as a 'Normal' Diesel.
In terms of a bigger turbo would the 3.1 turbo be bigger? Also already have a 65mm exhaust ready to change from the UBS55 to the UBS69, I jsut need to get the rear end modified as they are slightly differnt shapes in the back. That from the turbo back.

So if I was to do the 2.8 with the 3.1 turbo, and the 65mm exhaust, would the mileage I get be better than that of the 3.1 and would the ability of the engine remain the same?
Or should I just stop being tight and spend the money on the reco?

[geeves]

As yours is a manual it might work. Even in the Mu the 2.8 didnt really work that well with an auto but it was ok. With all the gear I carry in my bighorn Im close to the start weight of yours and it goes ok even on 32 inch tyres and 4.3 diffs. (got 31s on at moment as its wof time and keep leaving tread on the road)
The 3.1 turbo does give a performance boost on the 2.8 especially at the low end so its worth a crack but it is unlikely to be as fast and will notice towing loads a lot more (change down earlier its also less afraid of high revs). Economy wont match the old ubs55 but should be far better than your stated economy which is as bad as a petrol v6 Even your old engine should of been doing that distance on 44 litres not 70.
I drove a 3.1 auto yesterday and was really left wondering if the higher output of the engine was completely eaten by the auto and bigger body. Im not convinced it was any quicker than my 2.8