Outer Limits 4x4 Board

Hi all,

quick question for anyone interested.. OTHER than a turbo or supercharged, what do people think are the best modifications to get a bit more pep out of a natuarlly aspirated TD42..

Basically the cost is the limiting factor at the moment..

Thanks for your help,

Paul

Snorkel with K&N Air Filter.
Extractors and free flow exhaust.
Wind the injector pump in slightly.
Make sure you run a good diesel cleaner - such as Chemtech Diesel Power.

how do you wind the pump up to deliver more fuel?

is it simply a matter of advancing the pump timing or is there a screw or something on there?

Reason i ask is i have just been given for free (wouldn't buy it) a Electric supercharger that delivers 3-4PSI boost to the engine and was told to slightly increase the diesel flow. looked in my Gregory's manual, no mention of how to increase fuel, just timing,

There is a screw at the back of the injector pump with a 13mm locknut (maybe 2 locknuts).
Loosen the locknut and wind the screw in to richen (about half a turn to start with) go for a drive and accelerate, check for black smoke. If there is only a tiny bit of black smoke you may be able to wind in a little bit more.
Trial and error really.
You might be amazed at the extra power....

Trial and error really - Better to have a little more fuel than not enough.
Too lean will equal a hotter engine.
You might be amazed at the extra power....

Isn't that the wrong way around???? We are talking diesel here mre fuel more heat!

without sounding bad, save your money for a turbo.

PM Turps, he has a complete GU Turbo setup for aroudn 1200

extractors and complete 3in exhaust system would cost you a grand anyway...

weeksy wrote:Trial and error really - Better to have a little more fuel than not enough.Too lean will equal a hotter engine.

Dead wrong, it's the other way round, playing with fuel delivery on a diesel is best left to the experts, half a turn is to much also, half a turn makes a big difference in fuel.

Cheers, Jeff.

Thanks for all the replies..

Yeah I should have added that ive just bought the car and it had extractors and a 2.5in exhaust already on it.. I would really like to turbo but as I said money is tight.. Patrol has 240,000kms on it and injectors have never been serviced.. I was thinking having them re-valved might be money well spent??

Also Patrol has a snorkel but is it worth changing/removing the precleaner for additional flow.. I saw the photos from another posting with a GU pre-cleaner in a GQ (mine is GQ)..

As far as tuning goes I have no idea and would rather take it somewhere, it blows a bit of smoke but nothing serious..

Any more advice

Ta

weeksy wrote:There is a screw at the back of the injector pump with a 13mm locknut (maybe 2 locknuts).
Loosen the locknut and wind the screw in to richen (about half a turn to start with) go for a drive and accelerate, check for black smoke. If there is only a tiny bit of black smoke you may be able to wind in a little bit more.
Trial and error really - Better to have a little more fuel than not enough.
Too lean will equal a hotter engine.
You might be amazed at the extra power....

OK - I have done the above mods after consulting a diesel specialist.
The vehicle blows a little black smoke when the foot is down.
It does NOT run hot, it used to before the mods.
I get around 500km out of a tank, this involves alot of steep hill driving.
My power increased dramatically.
As the air quantity and temperature has improved due to the snorkel and K&N filter, the engine reuired more fuel.
Excessive amounts of fuel will create a little more heat under heavy loa/acceleration, but general driving will be fine.
1/2 turn of the screw is a starting point as directed by the diesel specialist.
Mark the screw before you move it, as you can always set it back to where it was.

From my experience i have found half a turn to be way to much.
Also to much fuel in a diesel will equate to more heat. Allmost opposite to a petrol vehicle.

Half a turn????? When you fit a turbo kit, they genrally recomend 1/3 of turn while monitering pyro's to start with..... thats with extra oxygen to burn the extra fuel. I think half a turn on a N/A engine is excesive, considering that exhaust temps arnt being monitered.

basically doing anything atall bar servicing your pump and injectors on a diesel isnt worth the effort. extractors do makesome difference but you already have them.
if you look around and can turn a spanner yourself you should have it turbo'd for about 1k-1500

if you dont want to turbo it take it to a decent diesel place and have the pump and injectors looked over. cant hurt for later if you do decide to turbo it.

my advice is turbo it you will never look back

badger wrote:basically doing anything atall bar servicing your pump and injectors on a diesel isnt worth the effort. extractors do makesome difference but you already have them.
if you look around and can turn a spanner yourself you should have it turbo'd for about 1k-1500

if you dont want to turbo it take it to a decent diesel place and have the pump and injectors looked over. cant hurt for later if you do decide to turbo it.

my advice is turbo it you will never look back

X2

I was deciding to turbo my Tb42 i know it's not a diesel but i was going to up my comp and gets a better cam and get a dyno and a few other things..

Then i thought after i do all that i'm not going to be happy still so i went with putting a T4 turbo on it running straight gas.. i haven't got the car back yet from being dyno'd and the 3" exhaust but i think it's well spent $$$ as said above..

Rick.

weeksy wrote:There is a screw at the back of the injector pump with a 13mm locknut (maybe 2 locknuts).
Loosen the locknut and wind the screw in to richen (about half a turn to start with) go for a drive and accelerate, check for black smoke. If there is only a tiny bit of black smoke you may be able to wind in a little bit more.
Trial and error really.
You might be amazed at the extra power....

Thanks mate. I will have a look and see just where it is and how hard it is to get at. With the 3-4 PSI extra boost i am getting with these electric chargers i thijk only a small amount of extra fuel will be needed

I work for a Prime mover Maunfacture, We are the largest w/shop for our company in Aust.
I was looking at mods. for my SD33, I know it's an older motor but same principle;
I was speaking to our diesel pump tech, who I can speak to 5day's a week, I rebuilt my injectors and up'd their pressure rating 15psi, I was then told about the fuel pressure screw, I was told that a 1/4 of turn would be heaps, that I would notice the difference but to only use it off road. this was because temps do rise, and black smoke is obvious from your exhaust. I was told don't run around like that all the time as it cook's pistons. I did it once off road, did notice a difference but was parrinoid about hurting my donk and couldn't justify doing it for the risk.
However I did go down the turbo road, and after having a pyro installed i got it tuned, They said the did increase fuel pressure.
Turbo was the best performance mod I have done so far, after doing it will never by another N/A motor 4x4.... ever

electric turbo=pile of ****=toy=FALL TO BITS AND BE SUCKED INTO ENGINE!!!=BIN IT

do not play with fueling UNTILL YOU HAVE PYRO FITTED..OR RISK KILLING ENGINE..

FOR REAL POWER INCREASE..TURBO IT AND INTERCOOL.

did i say fit a pyro???why???

well adjusting that screw you want/have adjusted just half a turn makes the difference between 550c on lfull oad up hill to over 650..(ali melting temp...)(atleast thats on my sd33,but principle the same...)

weeksy wrote:
Trial and error really - Better to have a little more fuel than not enough.Too lean will equal a hotter engine.

Weeksy,
To suggest increasing fuel delivery by 1/2 turn over standard on a N/A TD42 is foolish. It is NOT better to have too much fuel. Excess fuel WILL result in overheating. For you to suggest any of the above on a public forum is simply foolish and runs the risk of jeopardising someones engine.


Paul,
Replace air-filter and start with 1/4 turn on fuel screw. K&N filters while great for improving airflow, are not the best for filtration. As you don't have a pyro and EGT gauge its advisable not to exceed 1/3 turn on the fuel. Also, wind the fuel screw OUT to increase fuel delivery.

Elec turbo's can be helpful, but they're limited to about 4psi so that may not be enough of a meaningful improvement for most people. The 2 GQ's that I know have them are driven by older blokes who just wanted a bit more puff on the hills. My call would be to save for a turbo kit from reputable manufacturer.

pauluow wrote:Thanks for all the replies..

Yeah I should have added that ive just bought the car and it had extractors and a 2.5in exhaust already on it.. I would really like to turbo but as I said money is tight.. Patrol has 240,000kms on it and injectors have never been serviced.. I was thinking having them re-valved might be money well spent??

Also Patrol has a snorkel but is it worth changing/removing the precleaner for additional flow.. I saw the photos from another posting with a GU pre-cleaner in a GQ (mine is GQ)..

As far as tuning goes I have no idea and would rather take it somewhere, it blows a bit of smoke but nothing serious..

If you have extractors, and exhaust, snorkel, then the only next step is injectors redone, which does make a BIT of difference, but in reality as powerups go, then turbo is logically next... Either that or a put your car on a diet..

You can piss money up against the wall doing other small things, but not even worth the effort.

and as for the advice on the pump, dont fuck with it if you cant afford an engine rebuild, and have no EGT..

I remember a thread a few days ago that 3" stacks were a popular mod.

bogged wrote:without sounding bad, save your money for a turbo.

PM Turps, he has a complete GU Turbo setup for aroudn 1200

extractors and complete 3in exhaust system would cost you a grand anyway...

Yep Bogged is correct I still have a GU turbo system sitting looking for a good home. I'm not going to fit it anymore. Going to spend a fortune now and get a Juzza special instead.

turps wrote:Going to spend a fortune now and get a Juzza special instead.

I want a Juzza special

Whats a Juzza Special?

txhog wrote:Whats a Juzza Special?

look for the thread on Sparkys GU Ute.

txhog wrote:Whats a Juzza Special?

Juzza's a bloke from Bendigo, Vic. That runs a shop that does custom bar work and performance stuff. At the moment he has put together some nice diesel patrols. Last couple have had ballbearing turbos. Just look to be good systems that work real well and are well made.
He's also a mate and lives on the other side of town.
For an idea check out spark's thread from the other day. Also has a members thread with some pics of the bar work being made.

Ok, thanks

Whats his actual username?

Is it sparky?

has anyone fitted a lumpy cam to a diesel, i was thinking a tb stage one, might do the job?

patrol man wrote:has anyone fitted a lumpy cam to a diesel, i was thinking a tb stage one, might do the job?

You would then lose down low power... and you don't want to increase how many revs your old heavy diesel is going to do.

i had my pump done up and running 10 % more fuel with no probs and noticable power gain a bit of extra black smoke but its all good besides its a diesel still have to fit extractors and zorst though

azzad wrote:Whats his actual username?

Is it sparky?

Whose username?

if your talking about the 'juzza special', his actual user name is Juzza.