Club 80-90 Forums

I have a 1.6TD Syncro. I was reading about a modification to the LDA pin to make the van go a bit quicker and with the article I was reading there were pictures of the injection pump. The thing is, it looks different to mine. There was an obvious place for it on top of the pump. ine is different. Where should I be looking?

If its a proper JX pump they have a different shaped LDA thing so it fits under the engine lid on a van. Most tuneing articals that mention fiddleing with the LDA seem to be for the car version of the 1.6TD (ie not JX engines) and they have a very different LDA device. Regardless of shape they will be what the small pipe from the inlet manifold goes to, the JX is a horisontal cylinder shaped thing.

The JX LDA must do something otherwise whats the point of it? therefore it must be ajustable to some degree, somehow? Saying that I think some engines have no profile on the boost pin (AAZ?) so that actully does seem completely pointless.

Wouldn't mind knowing what I could do to mine, but then again its reliable and economic at the moment and I'd rather that than slightly faster; surely a little tweek wouldn't do any harm though .

JX LDA works from the boost of the inlet manifold. It`s got a diaphragm inside the canister (horizontal on top right of the injection pump) and as the boost increases the actuation rod moves out under pressure, moving the crank arm attached to the top cover of the pump, which increases fueling internally.

Not usually something to mess with or adjust. Not sure how much the fueling increases as the turbo boost increases, but I think if you can get the boost up to 12psi (max setting from factory according to the manual) the LDA should be set to cope with that. Mine runs fine with this ammount, no smoke, and I`ve increased the fueling via the max fuel screw, as per the info. on the GTD Tuning forum. Does make a hell of a difference to the power

Large front mounted oil cooler highly recommended if you are going to start increasing anything, and also an intercooler.

would second the intercooler/oilcooler advice.

Most JX engines die (prematurely) from thermal problems. Any fiddling for more power will also create more heat ...so more cooling is essential.


Or ...just don't fiddle anything and live with it

Well OK Ive got an intercooler to put on, and before I go mucking about with the engine too much I will fit an oil cooler too. lets talk about increasing boost pressure then. Whats the best way?

airhead wrote:Well OK Ive got an intercooler to put on, and before I go mucking about with the engine too much I will fit an oil cooler too. lets talk about increasing boost pressure then. Whats the best way?

Thats controled by the waistgate in the turbo, on a Garret T2 theres a rod on the outside of the turbo that works the waistgate, don't know about KKK's. More presure it takes before the waistgate opens, the more boost you get. You'll probubly need to ajust the dumpvalve on the inlet manifold aswell if you turn the boost up, mine keeps dumping with standard(?) boost so wouldn't alow more without being ajusted. When I fit a boost guage and can see what its boosting to I'm going to tweek the dump valve as as it keeps dumping boost on motorway hills - IRITATING!

Word of warning with boost though, things will get hot quickly if you go too far!

Maybe I need to go to my local boy racer shop and see if I can get a boost control valve where I can dial in an approximate pressure that I want it to open at. I believe on a KKK there's a solid metal pipe that goes from the turbo to the wastegate and Id need to tap into this. Really what I need to be doing is getting my van up on a ramp and taking a good long look at the whole turbo setup and figuring out how best to tackle it. Im not going to go mad. Just an extra bit would be fine. Up to maybe 10psi. That doesnt sound unreasonable, especially for a turbo of that size.

Yeah, mines the KKK, I removed the solid line, cut it and fed the valve from that and back to the other end of the pipe. You`ll need a boost gauge to make sure you are doing what`s required, tap into the pipe to the LDA from the inlet manifold, use a simple plastic T-piece (screen-wash pipe etc) and run a length of pipe through the `van to the gauge on the dash (mine is gaffer taped to the dash pod temporarily while I monitor it), will remove it once I`m happy it`s settled down without any dramas.

Blow-off valve on the inlet manifold, I capped mine off with a plastic cap and a large cable tie, works for me

Buy a decent quality boost adjuster valve, there are some cheeepo ones about