Cheapest Power Upgrade for 4D56T?

[Badman60]

Looking to squeeze a few more horses out of the old 2.5L.

She is a non-intercooled 2.5 Turbo Diesel with 248,000km's on 'er.

I figure I can either;

Install an intercooler - which I have been advised that it doesn't really give you any extra get up and go.

Turbo upgrade - which I assume could get costly, or

Exhaust upgrade - can get a 2.5 inch mild steel mandrel bent, no dump pipe, installed for $500 from the local shop.

There's also the snorkel install, which will be done in the future anyway, but don't think this would be a 'power' upgrade as such.

Think I've pretty much answered my own question here (2.5 exhaust), but would be interesting to get some other opinions, or some feedback from people that have done any, all, or some of these mods.

Not looking to have myself a 'race car' or turn the Paj into something she's not, just wouldn't mind having a bit extra out of the old girl (but in saying that, shit, she's a good sight faster than me old 60 series Landcruiser which felt like having the acceleration of a tractor, and the bloody handling of one too )

Cheers.

[ngwagon]

All would make a difference together but just depends on how much money or time you want to spend?

[Badman60]

For now I am only wanting to do one mod at a time, as I'm also putting money into the sound system and a few other odds and ends.

So really, the cheapest option to gain a bit more would be the upgrade for now.

[bakerboy]

i would have thought that winding the fuel pump up, adding a free flowing exhaust and an intercooler (to keep EGT's low) would be a pretty good combo

[Badman60]

I'm definitely leaning towards the exhaust upgrade, have been advised that a 2.5 inch would be ideal for the turbo diesel.

An intercooler would be nice to keep it all running cooler but for now the wallet is only allowing one thing at a time.

As far as the injection pump goes, mate, I wouldn't have the faintest as to where to start on tinkering with that thing..

[sigmare]

I think the best and cheapest upgrade would be an exhaust.
Installing a cooler will see results but only after you raise boost levels which then i'd strongly suggest a tune.

[Badman60]

I think the best and cheapest upgrade would be an exhaust.

Pretty much sold on going the bigger exhaust. Was a while ago I got a quote from the local guy for $500 for a 2.5" mandrel bent, mild steel exhaust. Might have to pop back in and see if it'll still be the same, and how much extra a dump pipe in the setup will be.

Would love to put more into performance (ha, if you can call it this ) mods, but just spent a bit more than I would have liked buying some audio gear for the beast. Need my heavy/death metal up loud for all the poor techno/rnb heads (is that what they all listen to now days...) to endure.

[pajero333]

intercooler 1991 Pajero diesel

All would make a difference together but just depends on how much money or time you want to spend?

Can anyone tell me whether the fan under the intercooler should come on at start up or not until engine (4D56 diesel) becomes overheated.
Fan used to come on and stay on right after wait for glow plugs. Changed after found some bare wires to intercooler. Don't know which situation is correct.

[Badman60]

Hijacked

Hey chief.

Mines not intercooled so can't tell ya.

Best off making a new thread in either the Generation 1 Pajero section or the 'Mechanical' section.

Sure someone will have an answer for ya, plenty of factory intercooled (lucky buggers ) Paj's gettin round.

[sigmare]

Can anyone tell me whether the fan under the intercooler should come on at start up or not until engine (4D56 diesel) becomes overheated.
Fan used to come on and stay on right after wait for glow plugs. Changed after found some bare wires to intercooler. Don't know which situation is correct.

Im not sure how the original setup is but i would definately have it running once the car is started.

[GSRSOL]

I didnt even know there was a fan under there?? but sure enough, I checked and there is.

Mine comes on when the car is started, although i dont think it would do very much, its bloody tiny.

Ive started looking for a ML or MN triton intercooler for mine which I will front mount so i get rid of the old school heat sponge.

[ngsam]

G'day, i'm new to this forum. I own a NG 4D56 turbo intercooled. I fitted a 2.5" exhaust back in 2007 when I got it, upgraded the fuel pump (don't really know the technical details, but it was done by Turbo Engineering, Thomastown), and increased the boost from about 8psi to 13psi. This gave me about a 25% power increase and heaps of torque. As stated on the dyno sheet, my car went from 45kw/340nm to 60kw/591nm at the wheels! It wasn't really cheap (for me), the exhaust cost me $420 and the fuel pump/tuning cost me $1300. I was concerned that upping the power and torque would cost me at the fuel pump, but infact I got around 50km extra per standard fuel tank right from when I drove out of there. If I had to choose the best thing to do to improve the performance, it would be exhaust! On my non-intercooled 4D56 turbo, I always ran 2.25" exhaust, but with the NG I was told to go for 2.5". I hope my advice helps (if it's not too late)!

[ngsam]

Can anyone tell me whether the fan under the intercooler should come on at start up or not until engine (4D56 diesel) becomes overheated.
Fan used to come on and stay on right after wait for glow plugs. Changed after found some bare wires to intercooler. Don't know which situation is correct.

I may be wrong, but I think that mine is going when there is air flowing through it (not at idle), but i'm not 100% on that one.

[Badman60]

Hey guys,

Cheers for all the input.

I went to see an exhaust specialist the other day, who put a 2.5" on me mates Terrano for quite a decent price, and he informed me that the exhaust on my Paj isn't stock size anyway (isn't a 2.5" thou), and on his recommendation, would probably wait until it really needs doing before spending the money, as it would be such a minimal gain for the money spent (too honest ey ). He had a good look at the system and said the muffler on 'er is getting on a bit, and advised that probably in 6-12 months time a new exhaust might possibly be the go. Guess I'll save the dosh for a snorkel and few other goodies for now.

I asked him about putting a dump pipe off the turbo, come new exhaust time, and he seemed to think that, a/ being such a small turbo on the 4D56T it wouldn't be really worth it, and b/ touching the bolts bolting up to the turbo could possibly be opening up a can of worms...

If anyone else has any input with regards to these recommendations/advice would be only to glad to here it, always appreciate other opinions and point of views.

As stated on the dyno sheet, my car went from 45kw/340nm to 60kw/591nm at the wheels!

Mate, that must be one rocket of a Paj. To be honest I'd be stoked if I knew mine made even 340nm, but 591nm at the wheels.... full on ey.

Is this all using the standard pissy little turbo that these things have on em?

Ive started looking for a ML or MN triton intercooler for mine which I will front mount so i get rid of the old school heat sponge.

I would recommend that if you are going to use your 4WD for 4WDing that a front mount would not be the best path to take. At crawling speeds there is going to be no airflow coming on to the i/cooler, and this is where a top mount with decent fan would come into its own. Also, once you get the inevitable mud splash up on it it'll also not be as effective.

Check out this link for more info on top mount VS front mount for 4WD's - http://www.crosscountry4x4.com.au/ar...leid=48&page=1


Cheers again guys, appreciate the input

[ngsam]

It's definitely not a rocket, but when it comes to driving up steep hills (highway driving), eg the hills leaving Adelaide, the hills approaching Toowoomba, the Moonbi's north of Tamworth, it can definitely 'hang on' to speed very well. When I went to Toowoomba for the first time, I managed to maintain 70kmh in 4th gear (2400rpm) pretty much all the way up to the top!