Fuel Pump Tweeking

[Nathaniel]

C'mon, who has done it? Got a 1993 2.8 Turbo Intercooled Fourtrak.

But as always I am looking for a little bit more power, black smoke is alway fun too.

I've read a guide on fuel pump tweaking for the LR TDI engine with the Bosch pump, fourtrak pump looks similar...

But can anyone confirm the screw on top fo the pump with the locknut and dab of yellow paint is the smoke control? I just want a bit more power on pickup before the turbo comes in, its slow off the line unless you slip the clutch (I hate slipping clutches)

Plus after fitting a boost gauge I have found there is a device that limits how much boost is supplied when in 1st gear, limits to to about 5psi instead of the full 11... Anyone know why?

Anyone played with the boost?

[Paul McCleary]

Nat, try http://www.outerlimits4x4.com

You have to register and log in to see the Daihatsu section.(something to do with another site linking to it as there own??)
There is a very good FAQ and the lads on ther are very helpfull.

Paul.

[Nathaniel]

Pah, Outerlimits were no good, its a good board and everything, but would they hell as tell me how to alter my pump.
Wah wah get a professional to do it.
Not letting anyone else touch my truck!


Anyway, purely by chance I was looking at how to turn up the Bosch VM pump that Landys have fitted.

and realised the fourtrak either has a Bosch VE pump or the Japs copied it (More likley the latter)

Well, this is damned easy to adjust!
Smoke screw for off boost required a washer under it to get enough lift.

But 2 turns of the max power screw and a twist of the diaphragm gives turly awesome power, it smokes like a tank now, so may back it off a touch.
I do like smoke tho...
I also am taking it steady until an EGT is fitted!

However it is a really worthwile mod if done correctly, I cannot beleive how much faster it is!


http://dodgeram.org/tech/dsl/more_power/Power_ve.htm

[Nathaniel]

Goota add that a few months back I added the ricers favorite a "Bleed valve" to the turbo wastegate so I could run 15psi boost instead of 11, made quite a bit of difference when towing, also its nice to see the boost gauge going right round to 1 bar!

[mudplugga]

I've wound the pump open on mine and it's made a lot of difference to the performance, and I still get a genuine 25mpg with my lead foot!

On my Cruiser 2.4 turbo I put washers under the turbo actuator which moved the rev range higher, a vast improvement, but I haven't tried the same bodge on the Dai' - yet....

I've thought about the wastegate before, the engine always seems to be capable of more, so I might try that.

Dave

[Nathaniel]

I've heard of the guys in the US that weld the wastegate shut on the Daihatsu engine.

Turbo gives 20psi apparently. Won't give any more....

I'm seeing my Boost gauge going off past 1 bar now I've opened up the pump, Nice!

I want a full width intercooler next, Landrover Discovery appears to be a good bet visually.

Snorkel is the next mod too, I ditched the original airbox and fitted a K&N, however she can't be drawing in the coldest air....

A less restrictive Exhaust is on the cards too...

[welshrrguy]

Nat, my dad has got a 98 2.8tdi. I was wondering, being more a rangie man myself, can you blank off the EGR valve?

Thanks
Paul

[Nathaniel]

Does it have an EGR Valve Paul?

My 1993 2.8TD doesn't.

Post pics of the offending item as I would be very interested in seeing one of the later engines.

[mcmoo]

That's a great site Nat. i've tried to adjust my pump before with slight but pleasing results. I'm getting a little more adventurous after reading that though.
Just one question. What is EGT?

[Nathaniel]

I now have a freer flowing side exit exhaust on, its an Audi frontbox, its a bit noisy when on full boost but I can get almost 15psi of boost at 2000rpm.

Was struggling to see 10psi at 2100rpm before.

Big difference.


McMoo

EGT is your Exhaust Gas Temperature

This is something you need to watch when turning up diesels, the more fuel in the hotter it gets.

Gauges are usually damned expensive, hwever I found on off eBay for £50 delivered, it is now fitted and works a treat.

On full boost up hills I can get 700*c maximum.

The limit is about 900*c

So I have a bit of breathing space.

Will give the pump a bit more when I have the full width cooler fitted.

[mcmoo]

I see. I put a VW SPAM box on my fourtrak. nice and slimline so doesn't get bashed offroad like the original monster. It's also straight through with baffle holes up it's length so it has a nice note without being offensive.
One thing i would say about a snorkel is try to use 3" tube. I used 2 1/2" stainless and i don't think it's quite big enough.

[skunk]

hi i have made some new manifolds to my daihatsu engine there lives in my landy
before i put turbo on it had 73 hp.. now with org 0.7 bar it makes 115 hp and it is fast as hell,, well in compare to before it has a big inter cooler and a 2.5 exhaust kn air filter and i gave it 1.5 turn in what you call it ?? smoke control... and it don't smoke ...

[callagas]

very interesting, will have to have a look at site.
Iv bought a DL-50 engine, (The 2.8td without all the electroics)

How do i fit an intercooler when the turbo is so close to the inlet manifold?

i want to fit an oil cooler aswell, where to i tap in to the oil pipes?

Has anyone heard if propane injection?

i want to tweek with the fuel and turbo aswell, but apparently its gotta be done rite else could have bad consiquences?

[Nathaniel]

Forget Propane injection for now - its expensive and a bit complicated...

Get an inlet manifold off a later truck with an intercooler 1991 onwards, allows you to fit a cooler.

actually a Non turbo inlet might fit...

Oil cooler kits generally go behind the oil filter, just screws on - I don't consider it the most worthwhile mod...

Take the top off the fuel pump *DON'T touch th diaphragm for now tho!*

and fit an M6 washer under the cam disc, reassemble...

power screw (on the back of the pump, has a bit of metal spot welded to it, pull this bit of thin locking metal off with snips and loosen the 12mm locking nut, turn the screw in no more than 1/2 a turn.

see where that gets you!

[callagas]

Good stuff, which way do i turn the screw?i have seen kits for about £100. basically just allows gas into the inlet to the rate of how much you stick your foot down.

How complicated is the propane injection then? if you know yourself could you explain whats involved?

cheers. mick

[johnsie22]

hi everyone im new to the site iv had alook around the site and think its great esspecially the fuel pump tweeking for diahatsus just a question does anyone know where i can get a stainless steel manifold for my 2.8TD fourtrak iv got a stainless steel exhaust system on it but i want a stainless steel manifold too and could i have some more inot depth information on tweeking the fiesel pump as i wan to get close to 140bhp iv hurd that they are capaible of it also welding up the rear diff what sort of dissadvantages is it welding up the rear diff as the vehicle is used on the road aswell as off the road will the diff or gearbox or shafts break if used on the road regulay or would it be ok or would i be able to get a LSD from somewhere all advice welcome keep up the great site

[callagas]

Welcome to the site mate. Not too sure about the Fuel pump and manifold, but dont weld ur diff up if you going to use it on road! Dont think it will break ote, just rip ur tyres to shreds, your better off getting an air locker if your going on/off road.

[DaihatsuDave]

I have a 1993 2.8 tdi fourtrak and i would like to recieve a bit more boost out of all the methods which is the easiest to get a bit more power?

WEE DAVE

[djcustom]

I work on pumps all the time. To tweek the pump right you need to adjust it in 3 places. the obvious one is full power screw at the back of the pump. screw it in about 1/4 turn and lock it. Any more than this will just cause clouds of smoke. the revs will incease but leave it til end. the second place is the excess fuel diaphram on the top of the pump. remove the cap which is held on with 4 allen screws. Take a pen and mark a reference line for the possition of the rubber diaphram to the housing. the reason for this is that the taper in the diaphram shaft is offset to one side, and moving it to the wrong possition will upset fueling. Rotate the diaphram clockwise about 20 degrees then replace the cap. putting a washer in it to force it down only helps on lower revs but not high end.The screw on the top is not the right way either. The third place is under the diaphram and involves re-tensioning the spring to nake it rev quicker, but this is not for the faint hearted as many a novice has destroyed their pump doing it. my advice is try the first 2 and leave the third step. you'l notice a huge difference!

[Nathaniel]

Just thought I'd update this thread to make it current.

At the moment the Daihatsu has:

Twin Tank Veg oil conversion running 100% Waste veg oil + 7psi electric fue lift pump

Power screw on the back of the injection pump screwed in two whole turns

"Smoke screw" cam has a washer under it and is set as high as poss

Diaphragm set to its widest position

star wheel under the diaphragm screwed right "in"

Boost bleed valve fitted to wastegate hose

Vacuum pipe to the boost release valve banked off

Boost Gauge fitted

Exhaust Gas temperature gauge fitted

Cherry bomb exhaust silencer (bigger than the engine downpipe) and side exit straight through exhaust fitted.

I will have it dynoed one day - I'm guessing at 115-120bhp over 101 as standard.

As it is now the next step is a bigger intercooler - BUT the clutch is now right on its limit as are my nerves when the roads are wet!

[parrotveasey81]

[Stal1878]

Hello all. Is it worth messing around with the pump on my non-turbo F70?

[fourtrakmad]

Ive turned the power screw one hole turn and it doesnt smoke at all but is a hell of a lot quicker,got an extra 5 psi of boost as well!!!

[4TEC4X4]

iv monkeyed with the pump alot not clear how much?!!! down pipe and silencer off a s reg master van boost controler standed tail pipe.
like sh*t off a shovel abit of smoke if you realey boot it tows tralier like a train hecktick in the wet and if driven nice is better on juice.

N/A gear box 2.8 tdi SWB old shape leafer known localey as the E smog

whats this Vacuum pipe to the boost release valve banked off all about is that why it boosts to 1.1 bar then tralil off to 0.7 ish shortley
thanks again nathaniel youve mede me a happy man

[ivorbiggin]

Tweek the fuel pump, nahhh, try sticking a 6 litre turbo diesel engine in from a ford f250, should go in easy, well maybe with a bit of gentle persuasion, a touch of cut and shut and a roll of gaffer tape, and it will up your meager 120 gee gees to about 350.

Uprating the brakes might be an idea as well

Ivor

[Nathaniel]

Well I got a new Fourtrak, Already played with the pump, got 2 turns on the starwheel under the diaphragm, smoke cam moved to maximum and a 90 degree clockwise turn on the diaphragm.
plus 1 whole turn on the power screw.

Result is a much more responsive and driveable car, now happy to trundle around town in 4th. and overtake in 5th.
Minimal smoke when on boost, easy to get a gout of smoke if you catch it wrong when off boost - but we like smoke don't we?

[EnFlaMEd]

Ok so today I tried adjusting the max power screw only on my TD engine. I turned it half a turn clockwise. The only thing I got though was an unacceptably high idle which also caused the engine to over rev between gear changes. Absolutely no power gain whatsoever and boost also remained exactly the same. What have I done wrong?

[parrotveasey81]

[EnFlaMEd]

Ah I was wondering how to bring the idle back. I figured surely not everyone is cruising around with stupid idle speeds. Cheers for the info!

Yes I have boost gauge and an EGT(pyro) however the EGT sensor is not installed yet due to some issues I had tapping the manifold I will try to get it sorted out this week. I also have an electronic boost controller to be fitted as soon as the EGT is in. My Rocky holds steady at 9psi as it is. Thats with a non intercooled 2.8td a snorkel and 2.5" turbo back exhaust including a custom divorced dump pipe.

I didn't want to go too crazy messing with things straight away without the EGT hooked up but once that is done I'll try adjusting the pump properly.

Do others who have tried this feel that it is necessary to also wind in the star wheel under the diaphragm?

It would be great if someone who has experience tweaking these things started a fresh thread with accurate information and maybe even a video on how it is done. Too much mixed information in the threads I have read about it.

Cheers

[parrotveasey81]