AUM / AGU Inlet Manifold

[number1bassman]

Quick question people, what's the difference between the inlet manifolds on AUM and AGU engines?

My car used to have an AUM but now has an AGU and I want to know if they have been swapped and if so, what would happen if they had fitted the AUM inlet manifold on the AGU engine?

Cheers for your help! 

[Phil_M]

If its got a bracket on the front for the throttle cable then its an AGU.

[Hulmie]

The AGU inlet manifold is larger port than the AUM. Also has a bracket for throttle cable and on one of the ports the bolt hole for the bracket that the engine cover screws into is in a different position.

[number1bassman]

Phil, that picture is great!  Thanks for that! 

Right, so I have got an AGU inlet manifold on my engine.  Next up, what's the difference between the injectors and will AUM injectors fit into the AGU manifold and how do I tell which ones I've got? 

Can you interchange the injectors between the manifolds?

And, would it cause any issues having an AGU manifold and injectors wired up to AUM ECU?

Just so you know, I'm trying to work out why my car doesn't go properly and I'm running out of ideas!

[Wazzzer]

AGU and AUM injectors are not easily interechangable as they are physically different sizes. Also they have different flow rates so unless your car has been mapped to the AGU injectors I doubt it will run right...

[number1bassman]

AHA! Wazzzer, you little beauty!   

So, if my AUM engine had been changed to an AGU engine with inlet manifold and injectors, unless someone remapped it for the AGU injectors, it'll run funny and not as it should?

This could explain why my car isn't as quick as it should be?  The AUM was replaced with an AGU, including manifold and injectors, but they kept the original ECU and mapping and that's why it doesn't run right!!!

Bugger, now that means I need a re-map? 

[Hulmie]

that sounds like the problem mate

[number1bassman]

Hulmie, Thanks for confirming it for me!  I had an idea there was something wrong with the mapping, always felt like the fuelling was wrong.

Right, now, anyone know anyone near Northampton where I can can get it remapped for the injectors?  I don't want to make it any more powerful, I just the bloody thing to run as it should!

Anyone help me?

[number1bassman]

Okay, how about if I get an AGU ECU will it fit?  I don't mind re-pinning the ECU, would it work okay?  I would lose the boost pressure sensor and the SAI and the downstream Lambda wouldn't I?  Might be a better option.

I could swap my ECU with someone with an AGU if it will fit okay?   

[Hulmie]

if your still running the AUM ecu and loom then i suspect that you will still be running a map sensor. So you wouldnt be able to use a AGU ECU as the agu's dont come with a map sensor. Another thing is you could still be running aum injectors in a AGU inlet as i believe you can use them by changing the injector seats in a AGU manifold for the ones used on a AUM and then just space the fuel rail abit.

The setup you have may be ok and the only way to find out is for someone to do some diagnostics on it and do some data logging. Personally i would give R-Tech a call and get them to sort it for you. As they would probs put it on the rolling road and do some live logging and sort the map out for ya.

If you dont want to travel then local places to you are Jabbasport in peterborough and Backdraft motorsport in Milton Keynes. Personally i would use R-Tech