Thread: I Need More Power Scotty

Went through this dilemma myself with my Isuzu County...

For me, an injector pump overhaul and injector nozzle replacement made a marked improvement. I also have extractors but as they were already on the vehicle when I bought it, I cannot comment on effectiveness.

I have aircon and no vents so decided against the turbo but believe it yields a marked improvement. The guys who have done it will chime in real soon.

I know on the 300tdi engines you can adjust the injector pump to increase the amount of fuel delivered to the engine, it's supposed to give you a bit more power. I don't have a clue if you can do that on the Isuzu engine tho. Just my two cents

(1) Check/Adjust timing - 10deg. BTDC is right I recall. Over time the pump timing will retard slightly as everything wears. Advanced timing usually gives better performance (but don't go too far as this won't help EGTs).

(2) Fuelling can be increased on an NA vehicle as well but don't go overboard. It made a noticeable difference on mine - even though performance was quite good compared to other 3.9s to start with. Even after the tweaking, my engine hardly smokes - even under hard acceleration.

(3) If the above are not enough, fit a turbo. I will be fitting one to mine soon, and plenty of others have done so and can give you tips. A 30% increase in power and a similar increase in torque is fairly easy to achieve.

This might be the silliest suggestion, but have you thought about the LPG injection system?

http://www.dieselgas.com.au/home.htm

They talk about 10-30% performance boost, and you get the government to pay for half of it.

It would also probably be a lot easier to plumb than a turbo.

Cheers
Simon

Originally Posted by abaddonxi

This might be the silliest suggestion, but have you thought about the LPG injection system?

http://www.dieselgas.com.au/home.htm

They talk about 10-30% performance boost, and you get the government to pay for half of it.

It would also probably be a lot easier to plumb than a turbo.

Cheers
Simon

From what I hear the best diesel/gas performance boost comes when you have a turbo AND LPG.

Nathan

The lpg does work better on turbo engines, as the introduction of the lpg requires more air to burn it. I have upped my boost by 2psi at the manifold.

well mine is a 4BD1T, but not having driven a NA 4BD1 I can't advise the difference... the turbo lag is... well.... er....um.... a long period of time to say the least, but then I'm tempted to intercool it as well - this should ensure an even longer time to kick in *sigh* a big fat exhaust will also help....

BLKnight is probably your best bet here as he deals with (and I assume drives) both motors regularly...

Ok Mr_sav,

Here is some info for you, I hope I don't confuse the issue....

When I bought my 4BD1 and installed it in my RR, it was ex 1988 110 and non turboed. It had about 390,000km on it, and was in excellent condition due to a religious service history. I immediately turboed and intercooled it, increased the fuelling and fitted a 2.5" free flowing exhaust.
I cannot comment on its standard performance because I hadn't driven it prior, but I have numerous NA 110's as customers and turbo ones too, and there is a huge improvement. I haven't dyno'd mine as I don't really want to see my Garrett turbo housing glowing orange just for the sake of a bit of paper, but I may in the future out of interest.

With equivalent gearing to an early 4 spd 110, and 255/85/16 BFG Mudders (33") fitted today,and sensible fuelling I get a max EGT of 520degC , and will hit the fuel governor at 130kmh in top gear easily. On a fuel consumption note, I get between 25 and 27 mpg without a worry, and I would ESTIMATE that I have about 30 to 40% more torque (a little lower down aswell) than standard. And very little smoke even though my injectors haven't been serviced yet. Ever.

With this fuel setting I get good economy, BUT I have had 650degC on the pyro with more fuel and boost, chirped the tyres and broken auto trans sprags with this engine in the past...

The use of piston oil jets and the like that is found in the factory turbo version is not really necessary in this application, as these engines are designed for a duty cycle on full boost ina truck with far more weight than a 110 is ever likely to drag along...And they will last 1,000,000km in a truck!!!

I would definately urge you to turbo it and you won't be disappointed.
You can Email me or call (03) 6229 1102 BH if you like for more raving and praise about these engines....

JC