It is currently Thu Oct 18, 2018 3:24 pm



Post new topic Reply to topic  [ 13 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: S60Pro : semi-sequential injection on a 6 cylinder engine
PostPosted: Thu May 03, 2018 6:42 am 
Offline

Joined: Thu May 03, 2018 6:26 am
Posts: 9
ECU Model: S60 Pro
Distributor: XAP (FRANCE)
Firmware Version: 82,15
Hi all

I'm goint to start a m20b27 bmw engine. It is a 6 cylinders four stroke engine.

The ECU is a S60pro type.

The engine is fitted with a cranck sensor closed to a pulley 60 tooth-2, but it has no camshaft sensor.

I have a question about injection : in these conditions, is it possible to realize a semi sequential injection ?

I mean a first injection on cylinders 1-5-3 (output 9, Inj1, on wiring schematic S60pro) and a second injection event on cylinders 6-2-4 (output 17, Inj2)

Thank's in advance for your retry, have a nice day, bye


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Thu May 03, 2018 9:37 am 
Offline

Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2901
Location: Norn Iron
ECU Model: No ECU
Wire injection as per instructions, 1 injector per cylinder in firing order.

I'm sure Alex can explain actual injection events and what is available.

Although I wouldnt describe what you propose as any form of sequential, more a strange batch fire setup.


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Thu May 03, 2018 12:37 pm 
Offline

Joined: Thu May 03, 2018 6:26 am
Posts: 9
ECU Model: S60 Pro
Distributor: XAP (FRANCE)
Firmware Version: 82,15
Some informations about the car : BMW 325i UE year 1986 Convertible

Some informations about the engine : 6 cylinders m20b25 engine
bloc cylindre 276KA bore of 84mm
cranckshaft from ETA with a stroke of 81mm instead of 75mm on origin engine
Origin cylinder head fitted with a asymétric camshaft dBilas 282/272
Connecting rods from e36 325i engine, length of 135mm associated with origin pistons
Compression ratio of 11,5/1 instead of 9,5:1

Informtations on electrical components
Injecors 14,5 ohms with a flow of 180cc/min
Origin spark plug
Origin Cranckshaft sensor, no camshaft sensor available
Origin idle speed valve & Origin oil level sensor
Air temperature sensor from Bosch 0280130039
Oil temperature from AEM 30-2013
Oil pressure sensor from STM TUNED P/N 30-2131-100
Barometric pressure from FENIXECU MAP0-2.5B
Throttle position sensor from m50b25 bmw oem engine OEM 13 63 1 721 456
Linear lambda sensor from Bosch 0258007156 with a signal amplifier from AEM 30-2310

See you later, bye


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 3:50 am 
Offline

Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1118
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
Wire the injectors in pairs, using the firing order of 1-3-5-6-2-4.

So the injectors fire in pairs, worked out like this:
1-3-5
6-2-4

Wire them as follows:
ECU pin 9, Injector 1 - Injectors 1 and 6
ECU pin 17, Injector 2 - Injectors 3 and 2
ECU pin 34, Injector 3 - Injectors 5 and 4


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 4:06 am 
Offline

Joined: Thu May 03, 2018 6:26 am
Posts: 9
ECU Model: S60 Pro
Distributor: XAP (FRANCE)
Firmware Version: 82,15
Alex, thank's for your fast retry

Firing order on this engine is 1-5-3-6-2-4, but it doesn't matter

So, in these conditions, the ECU will inject fuel :
- both on cylinder 1 and 6, with cylinder 1 in power (exhaust & inlet valves closed) and cylinder 6 in intake (exhaust valve near closed & inlet valve open)

- the behavior is the same for cylinder 5&2, and 3&4

But how many angular distance is there between the 3 injection phase during engine cycle please ?

See you, by


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 5:18 am 
Offline

Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1118
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
The fuel is injected at the same point for each cylinder, which is either at TDC or tooth number 1, I can't remember. It's fairly irrelevant to these engines.
As yours is a 6 cylinder engine, there will be 120 degrees between the injection events.


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 5:53 am 
Offline

Joined: Thu May 03, 2018 6:26 am
Posts: 9
ECU Model: S60 Pro
Distributor: XAP (FRANCE)
Firmware Version: 82,15
are you sure ?

because 1 injection event every 120°crk, that means that there is 2 injection events per cylinder per engine cycle (720°crk), it seems strange ..? no ?


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 6:22 am 
Offline

Joined: Mon Aug 01, 2011 8:20 am
Posts: 179
Alex is sure I am certain, there is no other way to fire 6 cyls with the S60 ECU


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 7:38 am 
Offline

Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1118
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
Rone Kenoby wrote:
are you sure ?

because 1 injection event every 120°crk, that means that there is 2 injection events per cylinder per engine cycle (720°crk), it seems strange ..? no ?

Yes, I'm sure.
With no cam sensor, the ECU doesn't know if the cylinder is on the compression or exhaust stroke.
The ECU simply fires the injectors twice per cycle. As the inlet valve is closed, the fuel simply sits in the inlet until the inlet valve opens.
This is how all OEMs do it with no cam sensor.


Top
 Profile  
 
 Post subject: Re: S60Pro : semi-sequential injection on a 6 cylinder engin
PostPosted: Fri May 04, 2018 7:48 am 
Offline

Joined: Thu May 03, 2018 6:26 am
Posts: 9
ECU Model: S60 Pro
Distributor: XAP (FRANCE)
Firmware Version: 82,15
why not, so if i understand your mind, each injector is fired two times per cycle :
- the first one when the piston is at top dead center before power
- a second one when the piston is at top dead center before inlet
we agree with that ?

and to bounce on a previous topic, at what moment exactly is fired the injector during engine cycle : at TDC time or at tooth number 1 (equal to 90°crk before tdc power)

i suppose at tdc ?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Theme designed by stylerbb.net © 2008
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
All times are UTC - 5 hours