Fuel Injectors
Turbo Mini Forums

I'm planning on swapping my 460 Rover/Denso injectors for some off a Skyline.

The reason is that the Rover injectors have a spray pattern, which I think may be contributing to wall wetting/charge robbing/VE issues.

The Skyline injectors have a pencil stream.

I just want to eliminate this possibility. I need another set for the Miglia anyway.

Both injectors are Denso high impedance with the square connector. The only possible problem is that the Skyline may be a slightly different fitting at the fuel rail.

I've googled everywhere but cannot get confirmation.

Anyone have any ideas?

This is the set that I'm thinking of buying:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...:MEWA:IT&ih=005

Edited by Paul S on 23rd Dec, 2008.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

might be worth seeing if you can get that part number cheaper anywhere else (unless you have already) as its common for there to be a "skyline tax" for all parts under that name!

I would have thought that a wider spray pattern would be better because it would have more chance of being carried by the air flow rather than just hitting the intake port between the 2 cylinder and splashing and puddling there.

But after reading some of Vizard's article which you linked, I don't think I can make any prediction and, in any case, would be interested to see the difference between the 2 injectors. And add to that the idea of different intake valve sizes and it makes for an interesting set of experiments.

Jean

http://www.jbperf.com/

Hi Have a look at the sierra injectors, thats what i use and i have no problems with spray, i think they are also a wide spray pattern.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Edited by jbelanger on 23rd Dec, 2008.

http://www.jbperf.com/

arnt skyline injectors (assuming your talking abou the "yellow" gtr (r32/33) GTR injectors) not less well fowing thena the rover mpi injectors....

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I'm struggling here.

All the big Bosch/Cosworth stuff is all low impedance.

The Skyline ND ones seem to have a smaller O ring at the feed end.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

If you are just after trying out the "pencil" spray pattern, don't Bosch do one with a suitable flow rate ???

There's a table somewhere on the web of their whole range and what it's fitted to, I've got it bookmarked but I'm not at my own PC at the moment.

I'll be using Bosch/Cosworth stuff (because I have it and am familiar with it) but my design of manifold - to fit between a standard metro turbo exhaust - means I will be pointing at the bottom wall whatever pattern I use !!!

Schrödinger's cat - so which one am I ???

Am I correct in thinking that I can use low impedance injectors on the V3 board, provided I set the PWM to limit the current?

If so then the Bosch/Cosworth injectors are probably the best solution.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

if you have the flyback stuff fitted then yes i think so.

You may get better results with a load resistor and not running PWM. But the best solution is to use a Peak and Hold driver board from Jean Belanger.

I have one complete with most components and im not using anymore. It was slightly modified to fit the VEMS, but there is no reason this could be changed. Im sure I got all the components for the Megasquirt install, i would just need to find them.

I also have a brand new Peak and Hold driver board PCB, but no components, this is also not going to get used. You would have to order the components from Digikey.

The bonus is that the driver board drives four individual low impedance injectors.

Have a look on Jeans website.

Let me know if you are interested

Edited by Sprocket on 24th Dec, 2008.

Thanks Sprocket. I'll think about it.

I was hoping for a cheap quick test to eliminate the possibility that the fuel for the inner cylinders is too finely atomised and starts to vapourise whilst sitting in the port, this excluding the air and running rich.

It's starting to get expensive.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Paul,

You can use low impedance with the V3 board. As you say, you just need to set the PWM parameters. This way you just need to get the injectors.

However, there might be an issue later if you want to go with the new code and use staged injector because having the 4 injector drivers will remove the possibility of using PWM so you'd need something like my p&h board mentioned by Colin. But if you don't need staged injector or for testing purposes you'll be fine with the standard MS V3 board and PWM. It's just more of a pain to setup.

Jean

http://www.jbperf.com/

Sounds like I am going to need the P&H Board for the Miglia anyway. That will need approx. 400 & 800cc/min injectors.

At the moment, I can get a reasonable idle on the 998 with all four 480cc injectors in use and that will provide fueling up to around 150hp.

Sprocket, you have a PM.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

My experience of pencil jets for what its worth is that they are very phase sensitive. Having said that it was on a 4 valve engine so probably of little relavence.
It was also very sensitive to position and relied more on air motion than vaporisation within the port.

Also you can make a pencil jet out of a conventional injector by grinding the cone off the end of the pintle (as long as it isn't a multihole type obviously!)

Good luck as it will be interesting.

I still like the easy route of plenty of wall wetting and careful transient mapping but I don't care about fuel consumption.