Outer Limits 4x4 Board

I have a question in regards to diesel injector pump timing..... i understand it gives you more power, but does it just move your power curv up higher? will i lose power down low where i really need it? at the moment, my useable power is between about 1,200rpm and about 3,250rpm. I don't want to have to take it to the red line to get the most out of it (4,250rpm). I'm quite happy where it is. A mechanic told me i can do it myself without doing any damage if i do it a small amount each time. If i can advance it and increase my power without losing much down low, then i will get it done.

RoeDao wrote:I have a question in regards to diesel injector pump timing..... i understand it gives you more power, but does it just move your power curv up higher? will i lose power down low where i really need it? at the moment, my useable power is between about 1,200rpm and about 3,250rpm. I don't want to have to take it to the red line to get the most out of it (4,250rpm). I'm quite happy where it is. A mechanic told me i can do it myself without doing any damage if i do it a small amount each time. If i can advance it and increase my power without losing much down low, then i will get it done.

Maybe you get some power out of it, but it is bad for the engine to advance the timing. You can get the explosion too early, when the piston is on its way upwards.

Builders of performance dieselengines retatrd the timing.

I read about this on a US website, it was an article how to build a high performance Cummins diesel. They said:, "never advance the timing on a Cummins diesel engine".

If you want more power, get a bigger exhaust, IC, a pumpupgrade, and then retard the timing. That`s the way to do it.

I retarded it on my truck after the bigger plunger. It is because you get much more fuel in a shorter time. It made the engine harsh with std. timing.

thats why i asked...... i knew you had to change your pump timing...... but i assumed it was advanced as you do in petrol engines...... i know very little about diesels. i sussed out where to do the pump timing..... but i don't know which way is advanced and which way is retarding it..... i don't have a T-belt, the Isuzu engine is gear driven or chain driven, so i'm told anyway There are not a lot of dyno tuners out there that will dyno a T/D... and those that say they can, won't get back to you, or cost a small inheritence to do it.

Advancing the pump timing wont do much but give you shit economy, if you want more power then get more air flowing through it and match to fuel to it. Ie, fit a turbo and give a dab more fuel.

PS, the isuzu's are chain driven.

it already has a turbo with a 2 1/2" straight through exhaust and an intercooler. Although, i am yet to fit a K&N filter. It has already been given a dab more fuel on the dyno at 10.5 psi boost....... i need to get it retuned to 12 psi

RoeDao wrote:it already has a turbo with a 2 1/2" straight through exhaust and an intercooler. Although, i am yet to fit a K&N filter. It has already been given a dab more fuel on the dyno at 10.5 psi boost....... i need to get it retuned to 12 psi

How much more power do you really need?

Gribble wrote:

RoeDao wrote:it already has a turbo with a 2 1/2" straight through exhaust and an intercooler. Although, i am yet to fit a K&N filter. It has already been given a dab more fuel on the dyno at 10.5 psi boost....... i need to get it retuned to 12 psi

How much more power do you really need?

whatever they can squeeze out of it at 12-12.5 psi of boost. Got more than enough off-road, just need a little more for the events at Rover Park in June

I retarded the timing by moving the pump towards the head. The same way it rotates. If you have the std. plunger inside the pump, you don`t have to change it, use std. timing.

And you are right, there is no such thing as too much power.

well it is a standard pump....... so i guess i leave it as is I just need to get it dyno'd again.