New Technical Area Launched - Saxperience

Simo^p · 9th July 2009, 21:49

All,

As some of you will have read, a new articles section has been under construction by myself and the content contributor team for a number of months. This evening, the first technical reference material 'went live'.

Special thanks to BobC for his efforts over the last couple of weeks!

If anyone else is interested to join the content contributor team and help to author/publish information and articles, please register your interest within the group memberships tab, within your User CP.

Premium Members >> Articles Section --> Technical Reference Area

Fulch · 9th July 2009, 21:58

Looking good Simo

JamesR^m · 9th July 2009, 22:08

Epic tbh, well done Simo and everyone who helped put it together!

chinkostu · 10th July 2009, 00:51

i aint getting pics mate?

Matto · 10th July 2009, 01:18

^Youll probably find you cant actually see any of the guides either, as your not a premium member.

chinkostu · 10th July 2009, 01:30

Quote:

Originally Posted by Matto

^Youll probably find you cant actually see any of the guides either, as your not a premium member.

ahh

Luke · 10th July 2009, 09:02

Awesome information.

I'm sure I'll use it

_ELECTABUZZ_ · 10th July 2009, 09:09

sounds awsome bud nice one

ryanmt · 10th July 2009, 09:36

Cant see the guides but i can see the intos

Quote:

The ECU controls the injectors separately by earthing them in the firing order 1-3-4-2 when the inlet valves are closed

Wrong, theyre fired in pairs.

Very funny lingo used too. "Twin static" insead of wasted spark and a few other bits.

Simo^p · 10th July 2009, 11:45

Sorry Peeps - the pics and article content is for Premium members.

Ive purposely set this up so you can see the intro, so you can decide if its something you may like to read, or not.

ryanmt - I'll make sure the author sees your comments, so has the opportunity to give input

BobC^m · 10th July 2009, 11:46

Quote:

Originally Posted by ryanmt

Cant see the guides but i can see the intos

"Wrong, theyre fired in pairs."

Hi Ryan, the spark plugs are fired in pairs but the fuel injectors are operated individually, or you'd end up with petrol being injected into a cylinder on the exhaust stroke.

ryanmt · 10th July 2009, 11:49

no theyre really fired in pairs, check the wiring on them. 1+4, 2+3. Its called batch injection, your thinking sequential. There isnt enough injector drivers in the ecu that although it did support it.

Some of the ecus fire all 4 injectors at once too

Also in your decription of the knock sensor i can see on simos thing.

You say that knock sensor detects pre-ignition and thats wrong. it detects detonation. Pre ignition and detonation are different things!

BobC^m · 10th July 2009, 12:12

Hi Ryan,

I have no idea what fuel injection ECU you are talking about. The diagram is clear to me. EACH injector is operated separately by the Bosch M7.4.4 ECU fitted to the 100hp VTR. This ECU has 3 plugs (as the title says) and 112 channels (connections). It was introduced to models from 2001 onwards to comply with more stringent emission levels. So you think they'd spray fuel into a cylinder on its exhaust stroke to tighten emissions...?

The title is: "Mk2 Saxo Electronic Control Unit (3-plug ECU)... Overview The Bosch ME7.4.4 and M7.4.4 ignition-injection ECUs..."

Wizzy · 10th July 2009, 12:14

Bosch Motronic injection systems used 'banked' fuel injection where all injectors are fired simultaneously. Late models user Motronic MP7 which is sequential, the injectors are operated in the firing order.

The Magneti Marelli systems use semi-sequential (or batch), where fuel is injected into each cylinders inlet tract twice per engine cycle- once during induction and once during power.

ryanmt · 10th July 2009, 12:17

The pre-2001 stuff. 1AP.xx range 1.4furio, vts etc. Thats far more common since saxo production was winding down 2001+ really compared to previous years

All it says to me is "Saxo Fuel Injector" so i cant see that

And yes. yes they do. The fuel doesn't actually go out the exhaust you know!

Also on the green/blue temp senders one goes to the ecu the other goes to the dash gauge/light youve got it as they're both wired to the ecu. On the later cars im not 100% but i know the ecu controls the fan rather than an extra thermostat in the rad.

Prickle^p · 10th July 2009, 12:49

Jesus how detailed, top work tbh.

BobC^m · 10th July 2009, 12:57

Hi Ryan,

Ok, you are talking about a different ECU. I agree that there are more years between 1996 and 2001 than 2001 and 2003. Perhaps it would be more beneficial for you to contribute "your knowledge" of the systems you "know" rather than those that you don't. As Wizzy points out there are many ECUs.

From what I have seen regarding temp sensors there are differences between early and late models, perhaps due to ECU channel availability. I am looking into the cooling system for earlier models and especially the sensors vs gauge and I will highlight anything I find.

Feel free to send me the specific Citroen schematic diagram references and I'll review them.

ryanmt · 10th July 2009, 13:51

All the diagrams are in the Haynes regarding sensors. The rest i cant give out cause ide get in trouble with the people that give them to me since they're copyrighted etc.

I cant contribute because im not a paid member.

Heres a guide about knock vs pre-ignition for you to read though
http://www.misterfixit.com/deton.htm

Simo^p · 10th July 2009, 16:08

Quote:

Originally Posted by ryanmt

All the diagrams are in the Haynes regarding sensors. The rest i cant give out cause ide get in trouble with the people that give them to me since they're copyrighted etc.

I cant contribute because im not a paid member.

Heres a guide about knock vs pre-ignition for you to read though
http://www.misterfixit.com/deton.htm

As a side note, you don't need to be a paid member to contribute - content contributors have extra privileges, to be able to view/access and contribute to areas, which regular members may not be able to.

JamesR^m · 10th July 2009, 16:10

Quote:

Originally Posted by Simo

As a side note, you don't need to be a paid member to contribute - content contributors have extra privileges, to be able to view/access and contribute to areas, which regular members may not be able to.

How do you actually become a content contributor?