Injector sizes

[cinquecento]

Looking at changing the injectors as part of my cam/intake mods. I already completed MSII install with 72mm plenum and 45mm trumpets. I am currently running the standard lucas green belt D1830 injectors whose duty cycle is well into the 90s during hard acceleration.

Any tips on which replacement injectors to use is appreciated, I am looking at abt 25lb injectors... however in looking at some candidates, is injector length an issue?? The Lucas injectors (right injector in pic) don't protrude into the air flow and are approx 5mm shorter than the manifold base. Is this an issue if an injector nozzle (left injector in pic)extends into the intake air flow?.

Edited by cinquecento on Monday 8th June 09:26

[cinquecento]

The plan was to get injectors that flow approx 22lbs at 2.5 bar..then initially control the Duty cycle with the ECU. Then down the track when cam and inlet manifold are fitted, I can up the psi (if needed) and fine tune the DS again with the ECU.

Currently looking at Bosch 0280150947 injectors...

[cinquecento]

Thanks for the advice.. If I upgrade the regulator, say to 4.0 bar for the new injectors, will I need a new fuel pump to supply the extra pressure or will the old (I believe it's still the standard one) fuel pump supply that pressure..

[cinquecento]

So these Bosch injectors, do they have a part number???

[cinquecento]

here's my punt..

Looks as if Chev LS1 (0-280-155-931) will do OK.. they flow at 26lbs at 3.0 bar..

[cinquecento]

Here's an update:

I've compared the Chev LS1 Bosch injectors (0-280-155-931) with the standard Lucas Green band injectors and have the following information:

Regarding flow, the 0-280-155-931 injectors are rated at 28.55 lbs 300.1 cc/min at 3.0 bar.

As the Lucas injectors are rated at 2.5 bar, all testing is done at 2.5 bar. The Bosch injectors(right) as expected had more flow with a finer spray pattern than the Lucas(left) injector



and a little more magnified



Next step is just install these injectors without any other mods...

[cinquecento]

Just an update to close this thread.

After ECU tuning I am happy to report a substancially smoother idle with less AFR variation and a noticable difference in mid-high range torque which I put down to better atomisation.

Next mod is a stealth cam..

[cinquecento]

MoJo,

The reason I went through all my testing was because I couldn't find any info regarding these injectors. Mind you I am not located in the UK: maybe there is more available to you. One the other hand, info regarding LS injectors abounds which is why I went the way I did.

Looking back, it's been a year since I did my testing and my Griff, now complete with Stealth can is running VERY well.