Upgrade diesels injectors?

Twiss · Post by **Twiss** » 17 Jan 2005, 16:50

Hello people
can the injectors on a 1.9 TD XUD9TE engine be upgraded ?
or will just having them reconditioned do ?

Robin · Post by **Robin** » 17 Jan 2005, 18:34

Generally speaking it's neither possible or practical to 'upgrade' injectors. If associated with other performance modifications it may be worthwhile changing opening settings or the injection pattern but this is highly specialised work.
Generally replacing them is all you can do and all that is required. Note that you may need a special tool for one of the injectors because it has a sensor within it. This one is often a new only part.
good luck, R

Post by **RichardW** » 17 Jan 2005, 18:58

Twiss won't need to worry about an injector with a lift sensor on an early ZX TD....!
There was a guy running a modified BX TD in Holland I think (Stefan) used to post on some of the forums, and had the injectors re-shimmed to open at a higher pressure which helps to give better atomisation and probably faster injection. The figures were something like up to 160 bar from 130 bar stock. You could possibly fit bigger injectors to get more fuel in, but I am not sure if any off the shelf ones will fit.

Twiss · Post by **Twiss** » 17 Jan 2005, 19:41

should I buy new injectors or get mine reconditioned. next question I need to find a place where i can get this kind of work done ( i live on the I.O.W ) with out losing my car to weeks on end so does any body know some where close ot me ( I will be looking my self) but I just wondered if any body would recommend any one).

Robin · Post by **Robin** » 17 Jan 2005, 21:22

Do GSF supply serviced injectors?

Brilec · Post by **Brilec** » 18 Jan 2005, 05:18

Yellow pages, under diesel fuel injection. All you normally need to do is replace the nozzles. Sometimes they can be reground.

davek-uk · Post by **davek-uk** » 18 Jan 2005, 21:04

Out of interest, can you get different sizes of injectors to fit the XUD? I was reading a VW TDi site and they were saying an easy upgrade is to fit larger injectors from the later, higher powered engines. If you are in a position where reconditioning is needed, larger injectors (if available) would be a nice option.

mrbump · Post by **mrbump** » 18 Jan 2005, 23:09

I looked into this one as well after reading something on the tdifaq site (same one daveuk?). There arent any different sizes of nozzle availiable unfortunately. Even the larger 2.1 and 2.5's have the same size, or so lucas told me anyway. Good idea about the shims to get the injectors to open later though. I've been told that you can also increse the actual pump pressure, so this would make sense. higher pressure = higher flow in the same amount of time = more fuel?

Twiss · Post by **Twiss** » 22 Jul 2005, 04:09

Hi People, sorry to bring this old post back to the surface. Well I need to get my injectors serviced/reconditioned (went to citroen asked how much for a new one, they said for 1 injector £130 I said no to that then), I went to lucas who qouted me £40 per injector. Is that a good price if not does any body know some one else I can send them to?
ZX Aura TD 1.9 135.000 miles Bosch pump and injectors, Actually I think most of the engine is orignal parts.
Thanks Twiss

Kowalski · Post by **Kowalski** » 22 Jul 2005, 04:13

I've been quoted £20 per injector for reconditioning, plus an extra £20 if they need new tips, so your quote of £40 per injector doesn't sound so bad.
Are you looking for more performance from your TD or just less smoke for the MOT? If smoke is the problem and your injectors are bad they may need retipping, if you need more performance the injectors won't hold you back, they'll give you enough fueling to blow the head gasket [:)]

jeremy · Post by **jeremy** » 22 Jul 2005, 04:21

have a look at this page - you can download instructions on how to do it yourself (if you have the kit!)
http://users.skynet.be/sn/manuals.htm
jeremy

Post by **Peter.N.** » 22 Jul 2005, 13:59

As has already been mentioned, you can get more fuel into the engine then you will ever need by opening up the pump delivery setting, this will result in a little more power and a lot of black smoke. The proper way to improve performance is to increase turbo boost pressure, you will then get enough air in to burn the extra fuel cleanly, you can increase the power as much as you like but have considerably increased risk of head gasket or even complete engine failure.

AndersDK · Post by **AndersDK** » 22 Jul 2005, 14:07

As Peter writes you do not adapt a petrol habit on diesels to upgrade.
Because on the diesels it's not the injector itself that decides amount of fuel - it's the roto diesel pump.
Diesel injectors are simply a springloaded valve - with a nozzle tip. They keep spraying as long as pressurised fuel is there to overcome the spring pressure.

Kowalski · Post by **Kowalski** » 22 Jul 2005, 15:12

Anders is correct here. Basically, to get more power you have to increase injection pressure or duration, or lower the opening pressure on the injectors.
You do get different nozzles with different numbers of and sizes of hole and different spray patterns but since the 1.9TD injectors are the same as the 2.5TD, you should be able to push enough fuel through them to get to 2.5TD power levels but it will eat your head gasket.
The VW engines do come with a range of different injector tips, they do a range of different power outputs with the same engine design (90 - 150 bhp for the 1.9TD) and the injectors are all different, hence if you're upgrading the power output of a VW engine you have to change injectors.