Injector upgrades

[Belle427]

I'm in the middle of a megasquirt conversion and wondered is it worth me replacing the injectors for the vauxhall red type.
Would make sense to do now rather than 6 months time and having to get it mapped again.

[Dougal9887]

Probably worth replacing solely for the better spray pattern.
The Opel/Vauxhall X18XE/X20XEV injectors (GM 90501588) flow 240cc/min and I have max duty rate of 87%, 5ltr engine. (The Lucas injectors flow 220cc/min so sizewise probably ok also.)
They're cheap enough second hand at about £10.00ea plus cleaning about £12.00ea.
Dougal.

[QBee]

You do the research.....but I have a set of used Cerbera injectors, cleaned and balanced, and I paid £50 for them. Should be good for at least 400 bhp.....and available for what I paid for them. Previous owner upgraded his engine and hence his injectors.

[Belle427]

Are they a direct fit to a 400 chim?

[BoostedChim]

Definitely for the better spray pattern. Megasquirt has a Required Fuel setting that makes swapping injectors easy, you just need to update the injector size in the Required Fuel settings, under General Settings I think. If you're only going with slightly bigger injectors it shouldn't need another mapping session. For a large increase I would only expect there to be minor tweaks require, mainly around idle.

[Belle427]

Fuel pressure needs increasing slightly also doesn't it?

[Sardonicus]

Higher BAR/PSI pressure not necessary but a bonus gives you a buffer for higher flow Vs later upgrades , I was running these at 3 BAR with an 80's BMW fpr but now use new old stock V8 BMW inj's at the same pressure , nothing wrong with the GM 1588 ones just that these came up brand new for silly money and proper dead time stats are available

[ric355]

Sardonicus said:

Higher BAR/PSI pressure not necessary but a bonus gives you a buffer for higher flow Vs later upgrades , I was running these at 3 BAR with an 80's BMW fpr but now use new old stock V8 BMW inj's at the same pressure , nothing wrong with the GM 1588 ones just that these came up brand new for silly money and proper dead time stats are available

I was looking at an injector change for mine a few weeks ago to something with published data, because there is no voltage correction data available for the Lucas injectors and that is something my DIY tune is missing.

Do you have a part number for those BMW injectors? I looked at the Vectra ones often recommended and couldn't find any dead time or voltage correction information for them either so there seemed no point in moving from one unknown to another.