More power for the 2.8l diesel pajero

Submitted: Thursday, Feb 16, 2006 at 09:01
ThreadID: 30824 Views:4897 Replies:2 FollowUps:3
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The pajero with the 2.8l diesel and 260,000k has not been on song for a while now. Doesn't like winding out and feeling like it is gasping for breath after a bit of a work out. 10 years old but not as old as it's owner. Was one gear lower on the long climbs, and overtaking required even more of a windup.
So I installed an electric fuel pump as a lifter pump near the tank, and amazing stuff, it is back to it's old ways.
Have been through a new fuel filter every 5 to 10k (20k by the manual), and rebuilt the injection pump. Injectors serviced as well in the last 12 months.

Gut feel is about 10% more power between 2000 and 3000 rpm, and it doesn't run out of breath anymore above 3500rpm to the 4500 rev limit. Also about 20% more power in that 3000 to 4000 rpm.

Reckon it is like a friend who got a pace maker installed. World of difference.

Discussed it with a couple of diesel experts and the mechanical lift pump on the motor has a return line back to the tank, so if the electric pump gets a bit enthusiastic, the excess fuel will just return to the tank anyway.
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Reply By: glenn_c - Thursday, Feb 16, 2006 at 14:34

Thursday, Feb 16, 2006 at 14:34
I have the same model Pajero. What pump did you put in it and cost? Any photo's of the install?
Regards Glenn
AnswerID: 155362

Follow Up By: Member - Oldplodder (QLD) - Thursday, Feb 16, 2006 at 20:44

Thursday, Feb 16, 2006 at 20:44
I had a spare carter pump left over feom an auxilary tank.
But any reasonablr fuel pump that is low pressure and medium to high volume will work. Carter and holley are good makes.

Mounted it on the round cross member above the tank on a piece of 12mm conveyor belt I had left over from a previous job. Stops thew noise comin thorugh the body. Redirected the existing line from the tank to the pipe on the side of the rail and put a new line from the upmp to the rail. If the pump fails I can go back to the origianl setup.
Mounted a relay under the bonnet off the battery with a 10 amp fuse. The switching current for the relay comes from the fuel cut off solenoid, so the pump only runs when ignition is on. Good for priming the system too after doing the filter.
While I was at it, I put in an extra filter from a 80 series landcruiser, they are 13 micron but only cost $10.00 each, instead of the $35.oo for the standard one. The standrd mirsu one is 9 micron.
Didn't want to do it before, roo much pressure loss through the filter.

Enough info :-) ?
FollowupID: 409404

Reply By: Axle - Thursday, Feb 16, 2006 at 19:22

Thursday, Feb 16, 2006 at 19:22
Hi oldplodder.
Before the new pump how was the fuel delivered to the main filter and on to the injector pump?. Boy! you rev that sucker , I hate going over 3200 revs with any diesel.
Cheers Axle
AnswerID: 155423

Follow Up By: Member - Oldplodder (QLD) - Thursday, Feb 16, 2006 at 20:55

Thursday, Feb 16, 2006 at 20:55
The injector pump has a low pressure mechanical lift pump on the back of it. Evidently they are marginal on these cars, and after a bit of wear can't do the job on full throttle for more than 30 secs to a minute, which is what i have found. Not so good on overtaking lanes when every one speeds up in the slow lane! You just start slowly getting past and you loose power:-(.

Max torque is 2000 rpm, so normally I drive 80% of the time between 1800 and 2500 rpm. Turbo comes on at 1800.

Occasionally rev to 3000 or 3500 if I have to.

Maybe sometimes, less than 5 times a year, might go to 4000 overtaking a truck in 4th, or about 120kph.

Max hp is 4000 rpm, but rev limit is 4600.
Never found it worthwhile going over 4000, but did it to see what happens with fuel delivery.
Evidently if the injector pump is being starved of fuel, it turns the timing on the pump back and it won't rev much past 3500 to 4000 rpm.

like you have found, look after the engine and it will look after you.
FollowupID: 409406

Follow Up By: Axle - Thursday, Feb 16, 2006 at 21:28

Thursday, Feb 16, 2006 at 21:28
Get the picture now, smart idea 260,000 km is not bad for a lift pump anyway without total failure. the landy one is vunerable after about 100,000 km, but their cheap to buy i guess.
FollowupID: 409411

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