More power for your 1.6TD

[JT Turbo]

 As you will notice i have noted the dot on the center piece of the diaphram clamp thing, and the notch on the edge of the lda.  when the dot is directly facing the notch, the boost pin is turned to it's lowest fueling setting, and the steepest shallowest side of the taper.  no fun there haha, as you can see i have mine turned completely opposite to the highest fueling point.  you may also notice that i point a mark with a permanent marker on the opposite side of the pump to the notch.

I would just like to mention that I was having a terrible time adjusting my pump and not getting the results I was expecting after having read this, until I realized that on my LDA diaphragm, the dot placement is opposite to what is pictured above - that is to say that when my dot is lined up with the notch it is at its highest fueling setting.

[zukgod1]

That can be true John unless someone has taken it apart and the dot isn't lined up with anything.

Realistically the pin needs to be lifted out of the bore to make sure the slope is where you think it is then reinserted. One could remove the pin from the diaphragm and realign the dot if desired as well.

[dubbinchris]

I'm a little new to the IDI pumps.  After reading the first page I have a question.  It describes two way to adjust fueling.  One way is to realign the dot on the diapharam which will change the position of the pin and I get how that works.  Then it talks about adjusting the star wheel.  Are these two different way to increase fueling and I can pick one or the other, or both.........or do they usually need to be done together?

Thanks,
Chris

[Op-Ivy]

The "dot" method should actually be done a different way. You should be aligning the sharpest part of the taper on the boost pin toward the left side of the pump (if you are facing the front of the car) if you want the most fueling. On some pumps the dot does not line up properly. This adjustment will allow more fueling when the engine is under boost.

The starwheel mechanism is used to adjust the rate that the fueling starts at. That is to say, the farther down you have the wheel, the earlier you will see extra fuel when boost comes on. Less spring pressure means less pressure required to push the diaphragm down.

Both can be used at the same time or different times. Depends what gains you are looking for. Obviously for the most and fastest fueling:

Starwheel down. Sharp part of the taper to the left.


Matt

[Smokey Eddy]

¿que es star wheel?

[dubbinchris]

op-ivy..... yes that makes sense with the dot.  Since my car is a Quantum I'll just need to take all your directions and turn them 90 deg.

Once I get the car to start again I'll try this stuff.

Thanks for the help.

[dubbinchris]

Andrew, very good explaination on that one.  Thanks for being so thorough.  I'll reference this again in the near future.  I won't be getting too aggressive as I don't have an EGT yet.

So when you say floored off boost do you mean a quick full throttle rev with car parked?

Thanks also for the help in the other thread as well.

[Smokey Eddy]

Interesting stuff.

I find that if i start at like 1,000rpm (when you first release the clutch) at WOT it seems a lot slower than if i gradually lay into the pedal, you know, the "sweet spot"! or is this in my head and with diesels such as ours there is no such thing. It seems to bog a bit. Is that a perfect example of where fine tuning these settings would optimize fueling with rpm, boost and so on?

[dubbinchris]

To really see what's going on you need both EGT and boost gauges.

I figured that would end up being the case.  A boost gauge is easy enough to do on short order.  An EGT will be a bit more of a process for me to jump on.  So many projects around my place already, including a soon to be turbo Fox wagon.

Thanks for you help.

If I can't find anything reasonable around here, I'll prob be considering your resealing service.  Do you have anybody on this forum that you've done pump for as a reference?

[Jettage1]

I can appreciate the "maximum fueling" concept, but it's not the approach I take even if I want max power.  My approach is to turn the max fuel screw in until it smokes a bit when floored off boost.  Then adjust the starwheel, pin stop ("smoke screw" in the initial pic) and boost pin rotation in order to achieve a similar amount of smoke across all of the boost pressures the engine experiences, e.g. if the smoke clears as boost comes up then go for a more aggressive slope or lower the starwheel.  Once a similar smokescreen occurs throughout the range of boost, then turn the max fuel screw in or out to increase or decrease all of the fueling across the board.  Just turning the boost pin to max or lowering starwheel to max can result in excessive smoke/EGTs at certain times and in essence hurting max performance of other times when the fueling is less.  Rotating the pin to more aggressive and dropping the starwheel can result in excessive EGTs at inopportune times, e.g. hill climbing.  If going for an unequal fueling, I would actually prefer to see excessive smoke off boost and then clear on boost as it will spool the turbo faster and result in lower max power EGTs.

Andrew

Hey Andrew - would you recommend this same method for getting a good adjustment on a newly rebuilt pump?  I think my Giles-built pump could use some fine tuning for my particular car.  Too much smoke for my taste, but I don't want to be guessing around with adjusting it.

Thanks!

[Elwood]

Sorry to bump a new thread, but I'm here to get a little clarification if I may? So I've currently removed all the bits and pieces to get to this star wheel. Now I've turned it to the right to increase fuel economy, yes? I was wondering, how many turns should i put in, or just as many as I can until it wont turn?

Also after turning the star wheel for fuel economy, which way should I align the dot on the diaphragm to maximize the effects? Oh and is there any harm or risk in doing this, like long term use will damage the engine? Will it need checking monthly to make sure it is all still correctly aligned?

[Deedko]

I'm also interested how it afecct on fuel economy after fixing fuel??

[hippiekiller]

economy with the fuel turned up is controlled by the right foot....with the starwheel spun all the way up, however, the pump will require more boost to deliver extra fuel....with the (pre-load) screw on the top cover backed off and the starwheel spring tension set high, at low boost levels there will be a minumum amount of fuel delivered...at least thats how I see it...

[Deedko]

that mean if i put star wheel down I increase full usage, or if i put star wheel down I will safe the fuel.

also I wanna now with max power whics is usage of fuel ( l/100km), where should be the golden middle of power and fuel usage in that settings

thanks

[hippiekiller]

tuning