Who has tweaked their fuel pump to produce better driving characteristics???

I have been reading the following:

http://www.landroverweb.com/Pdf-files/Tuning_Land_Rover_Tdi_engines_Rev_2.pdf

I feel like carrying out the stage 1 Tweeks to simply provide a slightly better off boost performance! I am going to fit a performance filter that will provide better air flow and hence lean off the current fuel flow so I guess a slight Tweek will do no harm anyhow as it will only make the fuel/air mixture richer and so reduce EGT temps whilst providing slightly better off boost umph!!!

iv done it, sets off smoother, smokes abit more but not overly, if you make any changes keep a note of wehat you change incase you need to change back.

Paulmitchell1984 said:

iv done it, sets off smoother, smokes abit more but not overly, if you make any changes keep a note of wehat you change incase you need to change back.

Click to expand...

What stage of the process did you take your tweaking too??? Did you go further than stage 1???

Lots of info here about it.. http://www.landyzone.co.uk/lz/f8/sluggish-disco-not-any-more-146991.html

Personally I'd just turn the diaphram 90 degrees. Takes 5 minutes and makes a massive difference with minimal fuss!

stingrey said:

I have been reading the following:

http://www.landroverweb.com/Pdf-files/Tuning_Land_Rover_Tdi_engines_Rev_2.pdf

I feel like carrying out the stage 1 Tweeks to simply provide a slightly better off boost performance! I am going to fit a performance filter that will provide better air flow and hence lean off the current fuel flow so I guess a slight Tweek will do no harm anyhow as it will only make the fuel/air mixture richer and so reduce EGT temps whilst providing slightly better off boost umph!!!

Click to expand...

I think you may need to do a bit of homework on how diesels work! Then it'll make more sense. A diesel engine always has an excess of air going through it, tweaking the pump simply puts more fuel in and uses some of that spare air, or all of it if you go too far then you get black smoke? Basic adjustment to the pump do make a big difference. But you need to record what you adjust and the more time you put into setting it up the better the results. Just turning the diaphragm does make a big difference but if you spend a it of time adjusting all the settings it transforms them, off boost as well as on. Best to research it well, understand what the adjustments do, and take your time setting it up, testing it, tweaking it, testing it, and so on, if you do it properly you'll be checking the boost pressure as it often drops over the years!

I turned up the pre-boost/smoke screw to help me get up the very steep hill that I live on. It makes an enormous difference to the low revs performance when the engines cold.

Just tweeked my pump 90 deg on diaphragm and 1 1/2 turns on smoke screw. Wow what a difference. Too much black smoke though so turned the diaphragm back to just 45 deg from original setting and 1 turn on the smoke screw. It's now too dark to test but I'm hoping all is good when I test it tomorrow. I can't believe the increase in performance from just playing with such simple tweeks.

I went to 5 o'clock on the diaphragm, 1 turn in on the star wheel, one turn on the smoke screw and half a turn on the lock screw on the back of pump. Not fast but no way sluggish. A little black smoke under heavy load but can get up to approx 32 mpg

Settings
3pm on the diaphram
1 turn on the screw on the back
star wheel only needs half a turn.

However, it is worth fitting a boost guage at the inlet end first to make damn certain you're boosting properly first.

If you tweak the pump and your real problem is loss of boost then all you'll do is send your exhaust temp through the roof under load.

Make sure the boost pressure at the inlet manifold is right before you mess with the pump.

Ive known a number of people tweak the pump to compensate for a weak wastegate actuator - pointless thing to do.

Hello,

I have tried the fuel mod and its an improvement.

But how do I know when my settings have reached the engine limits before I do damage?

I don't know exactly what I am doing so I have ordered a EGT gauge so I can monitor the temp at least. However, should I be monitoring the air pressure? or is this a nice to have but not necessary ?

Boost pressure

It couldn't hurt to, however;

I presume you saw the 'dimple' on the top of the diaphram and turned it to about 3pm (it should have been at @12noon).

A couple of notches on the star wheel and half a turn on the full load screw would see better performance but not enough to kill your engine.

Thanks for the reply.

I think I'll order a boost pressure gauge but there does not seem to be anywhere to connect it. My vehicle has no wastegate etc. I am guessing I have to remove the inlet manifold and tap it? Unless there is a plug hidden at the back of the manifold where I cannot see it ?

If so, I am wondering what gasket kit I need?

Ive done 60deg on the diaphram, 360degrees on the star wheel and a turn on the screw, smokes a little too much though so i'm gonna reign it in a bit.

EGR removal also made a big difference too

never touched the pump drilled two extra holes in air box and have a water bubbler disco runs like a swiss watch:boink:

Jason F said:

Thanks for the reply.

I think I'll order a boost pressure gauge but there does not seem to be anywhere to connect it. My vehicle has no wastegate etc. I am guessing I have to remove the inlet manifold and tap it? Unless there is a plug hidden at the back of the manifold where I cannot see it ?

If so, I am wondering what gasket kit I need?

Click to expand...

Are you sure your not getting confused with the EGR.The wastegate/acuator is under the manifold on 300's. You should have a little black pipe the comes off a banjo on top of the fuel pump.I cut in a boost gauge to this.If you follow it back you'll find what you say you don't have

dieselreek said:

never touched the pump drilled two extra holes in air box and have a water bubbler disco runs like a swiss watch:boink:

Click to expand...

Water bubbler - is this a water/methanol injection system? If so, how do you find it affects the performance?

the bubbler is a simple canister that draws air through water when engine running

this and a lot more can be found on the free energy site by patrick kelly :boink:

The water bubbler sounds interesting, but I am not sure how it could work because to draw the large flow of air through water it would need a large water tank and the pressure drop would be significant. I wonder if better to simply inject water at high pressure using a fine atomising nozzel.

On the matter of where to connect a boost gauge. I looked at the inlet manifold a little harder, there it was. A M12 plug with 1.5mm thread pitch located at the rear of the manifold ready for me to connect to. Problem is solved.