Injectors

The Monty · 02-05-2007, 12:50 PM

Will V8 injectors fit in a 6. Ie., XR8 injectors in my AUi6, Yes or no.

StealthAu · 02-05-2007, 01:12 PM

Yes, tune required

howesy · 02-05-2007, 01:27 PM

The capacity per cylinder is actually greater in the six cyl. When they did the 5.6 stroker they put bigger injectors in. Check the part number thaey are actually same as used in previous six cylinder models 24lbs.
best do some figures i'd reckon.

xr8ute · 02-05-2007, 01:56 PM

Quote:

Originally Posted by howesy

When they did the 5.6 stroker they put bigger injectors in

No the injectors are the same, they just increased the fuel rail pressure.

howesy · 02-05-2007, 02:22 PM

Quote:

Originally Posted by xr8ute

No the injectors are the same, they just increased the fuel rail pressure.

Sorry only as good as the info you hear. When I was at service dept he told me they were different injectors to std xr8.

The Monty · 02-05-2007, 01:25 PM

Stock computer should run 24lb injectors, correct?

xr8ute · 02-05-2007, 01:55 PM

Quote:

Originally Posted by The Monty

Stock computer should run 24lb injectors, correct?

Yes, but as mentioned before, tune required.

Are you running out of fuel capacity now? How much injector do you need?

I think the AU I6 injectors have the jetronic connector where the AU V8 injectors have the USCAR connector.

Cheapest option might be just to get an XR6 computer, XR6 fuel rail, and XR6 fuel reg...

The Monty · 03-05-2007, 01:37 PM

Quote:

Originally Posted by xr8ute

Yes, but as mentioned before, tune required.

Are you running out of fuel capacity now? How much injector do you need?

I think the AU I6 injectors have the jetronic connector where the AU V8 injectors have the USCAR connector.

Cheapest option might be just to get an XR6 computer, XR6 fuel rail, and XR6 fuel reg...

Its for when the turbo goes on. I have been told by numerous people, even people running 24lb injectors, that no tune will be required. Ill only be using the stock ECU, at the highest boost it will handle (around 6 psi), so I think injectors will be important.There are a few people running the 4 litre on stock computer at 6 psi, and they get around 170-180 kw, so Id say fuel will be an issue. So yes they fit, but you guys say that a tune will be required.
Ill be running a rising rate fuel reg, if that makes any difference.

xr8ute · 03-05-2007, 05:11 PM

What are the size of std AU i6 injectors...19lb/hr @ 39psi?

I'd be suprised if the std computer would even idle with injectors that are 25% larger than it is programmed for. The "self learning" might be able to account for this a little during cruise, but it will be a pig.

Regardless, 24lb/hr injectors are still on the small side for a turbo.... I think you would be better leaving the stock injectors and running an FMU (assuming you want to do this on the cheap). That way inj pulsewidth calculations will still be OK for idle, cruise, and light throttle, and you will only be getting additional fuel when making boost. Vortech FMU's seem to go on eBay 2nd hand for around $100.

Where you will be at a disadvantage, compared to the E-Series guys, is that you can't pull any "base" timing from an AU without a chip i.e. there is no distributor that you can rotate to reduce spark across the board. Too much ignition advance is just as likely (even more likely?), too cause pre-detonation with boost than a lean AFR.

So in short, you will need a tune to run bigger injectors. But the injectors you are proposing will still be too small, so forget them and just stick with stock injectors and an FMU.

Have a think about retarding ignition timing. If you can, rig up an adjustable bracket for the crank trigger pickup so that you can pull a few degrees from base timing.

StealthAu · 04-05-2007, 09:43 AM

If you are unsure, get some and give it a go. But I still say you'll need a tune.

The Monty · 04-05-2007, 07:09 PM

Ok, so another question, and I only ask as I dont know, and I need to learn. How much power at the rear bags will the stock injectors handle?
Will they handle 180 kw safely? Without being on the edge of destruction.

**Stav** · 11-05-2007, 12:40 PM

Quote:

Originally Posted by The Monty

Ok, so another question, and I only ask as I dont know, and I need to learn. How much power at the rear bags will the stock injectors handle?
Will they handle 180 kw safely? Without being on the edge of destruction.

I have proven that the stock au injectors will max out at 160 to 166 rwkws in an auto six .In a manual you should see 170 to 176 rwkws.

The Monty · 11-05-2007, 02:11 PM

Cool, forgot I asked that question, then proceeded to buy F6 injectors...... We w3ont go there, silly me. Im just going to go to an injector place and see if theyll take a trade on them. Or does anyone here need a set of F6 injectors?

StealthAu · 11-05-2007, 02:25 PM

what are they rated at?

Hibbz · 11-05-2007, 03:04 PM

Hey mate who are you getting the turbo gear through ya should give snort performance a ring explain the power you wish to have and they should be able to give you your options.

Jake

**Stav** · 11-05-2007, 03:17 PM

If the f6 injectors are the same as xr6t then theyre good for around 260rwkws at 100% or 230 at 80 odd percent.I am not really sure on the fine details but they are around that much.However they say that they dont suite our sohc heads but the four valve heads like ba..

The Monty · 11-05-2007, 04:02 PM

Stuff was bought off a member hear, from snort or a brnad off Snort or something. Its just the parts that dont come with the kits that are a killer.

xr8ute · 11-05-2007, 04:03 PM

F6 injectors are the same size as BA XT injectors aren't they? XR6T and F6 just ran a higher fuel pressure in the rail compared to the n/a engine...I think 4-bar vs 3-bar.

If you put them in your AU with the std AU non-XR reg, then they will not support anywhere near 260rwkw.

**Stav** · 12-05-2007, 08:31 AM

ba injectors need 50 psi odd of fuel rail pressure to achieve 260rwkws.

xr8ute · 12-05-2007, 10:25 AM

Quote:

Originally Posted by Stav

ba injectors need 50 psi odd of fuel rail pressure to achieve 260rwkws.

I believe the B-Series Turbos run a 4-bar fuel pressure reg, which is closer to 58psi...

xr8ute · 12-05-2007, 11:14 AM

Quote:

Originally Posted by xr8ute

I believe the B-Series Turbos run a 4-bar fuel pressure reg, which is closer to 58psi...

..and AU's (XR6 excluded) run 39psi/2.7bar fuel rail pressure.

So those injectors at 58psi will support 260rwkw, then at 39psi they will support more like 170rwkw.

Regardless, you will still need to tune the computer someway to account for the larger injector.

You've got 2 real options;

1. Buy an FMU, and tune it rich as hell on boost so you dont pop the motor with its std injectors and ignition advance. Cost $150-200 (second hand)

2. Buy a CAPA flash tuner, and some bigger injectors, and safely wind some real boost into the motor. Cost ~$2000 inc injectors and tune.

As I mentioned before, this is safer to do on EA-EL (excluding EF), because you can pull some ignition advance as well.

The Monty · 12-05-2007, 04:03 PM

I think Ill end up going the flash tuner route, but that means it will be a longer process. Keeping in mind I only want around 180-200kw MAX, will a unichip be able to be tuned for it?

Futura01 · 12-05-2007, 05:09 PM

monty, I did alot of research regarding a unichip system , and yes they can tune it to run properly with additional parts (extra module) to be exact which will increase the maps in unichip for timing and fuel mapping.

But i was told the unichip system cant read boost , so in other words it's only fuel mapping and ignition timing that will be done to make the turbo run okay but it will support safely to about 180rwkw on std injectors.
Ask spiro at autotech , he told me the could do it.

The Monty · 12-05-2007, 05:35 PM

Cheers mate. Will try and chat too him.