GTD LDA boost pressure question.

[Baxter]

Okay, I'll start from the begining.
I Have a VW T3 (Vanagon)
It has a 1.6TD JX coded engine.
It has the following pump on it..



As you can see the LDA is laid upon it's side so there are no clearnace issue with the engine lid.

The engine lid creates the base for my bed, so I could do with it staying unmolested.

I have a intercooler, a bleed valve, some GTD injectors and I am going to modify the pump as per instructions elsewhere.

So, I do have a GTD pump on the bench waiting to go onto the van, but this means hacking the engine lid about, which will give me a lumpy bed!

Okay, I was playing around with the pump, a pressure guage, some tubing and the airline with a regulator as I was interested to see at what boost pressure I had maximum movement on the LDA.

What I was hoping to do was give the LDA a longer operating pressure and raise the pressure where the LDA came to the end of it's travel but there is very little adjustment on the system.

I was getting maximum movement at .5 bar! (7.35psi)

I've not looked inside the governer body yet, but the thing that limits this system is the length of travel in the aneroid itself, if it had a longer piston body then I think I could make it work over a greater range of pressures.

I think the other way to do it would be to remove the ball joint where the pushrod meets braketry and move it in slightly..

My question is, at what boost pressure on a GTD does the LDA come to the end of it's travel? or am I pissing in the wind with this one?

Thing is Im going to adjust the boost pressure, and at .5bar the LDA stops giving you more fuelling, I was hoping to get the LDA to work right up to 1 bar or so where I intend to set the boost pressure.

Is it worth me living with a lump bed and fitting the GTD pump or does that also run out of steam at a similar boost bressure?

Any help or pointers to the fundamental bit of info I have glossed over would be ace!

Cheers!

Simon.

[Baxter]

No one?

[Baxter]

Yeah, when I do AAZ conversions the biggest problem is the throttle linkage not the aneroid.
I was more concerned about the range of LDA movement as it doesn't leave much scope for tuning.
I have a GTD pump and JX throttle linkage, think I will go that route.
I was just wondering what pressure the GTD aneroid stopped moving, but as you say I can swap the boost pin for a different shaped one and I have more scope for tuning.
Cheers for the input.
Simon.

[Baxter]

That sounds like a load of messing, get what your on about but considering I have a GTD pump I think I will put that on instead and live with the lump!

Yeah, I thought about moving the pin closer to the fulcrum and just elongating the holes that hold the aneroid down to angle the pushrod closer to the centre line of the new pin position.

That style of aneroid was only fitted to the JX as far as I can see, I know of nothing else that uses it, and seeing as boost pressure is set to .45-.55 bar for the engine there is no reason why it should have any more adjustment than that.

So, proposed spec for engine is as follows (taking into account the JX was 70hp and not 80hp as per GTD)

1.6TD with bucket and shim head.
Intercooler with electric fan.
switchable boost pressure as per other thread.
GTD injectors.
GTD pump with mods.

"AAR" gearbox from 2.1 Caravelle with factory LSD!

It hopefully should make a nice bus on the motorway!.

http://194.242.159.246/brickyard/forum/forum_posts.asp?TID=4193&PN=1

[Baxter]

Factories, well they gotta make it somewhere!