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931 & Boosted 924 EFI List and Discussion Thread
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Lenkru  



Joined: 27 Jul 2010
Posts: 10
Location: CAPE TOWN, SOUTH AFRICA

PostPosted: Wed Jul 28, 2010 1:30 am    Post subject: Reply with quote

Here is some pics. I am busy fabricating a new plenum, and I will take pics as I go along. Here is with the single row injectors.

[img]http://mynetimages.com/album/lenkru/924?img=dee365272b[/img]

Here is with the double row I need when boosting over 1.2Bar


[img]http://mynetimages.com/album/lenkru/924/?img=03d086d0fb[/img]



Hope I did this right I haven't posted photo's before
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Wed Jul 28, 2010 2:12 am    Post subject: Reply with quote

The stuff between the IMG tags MUST end in either .jpg or .gif.

Try this:








Tell us more about that boosterless setup shown in the last image...
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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Lenkru  



Joined: 27 Jul 2010
Posts: 10
Location: CAPE TOWN, SOUTH AFRICA

PostPosted: Wed Jul 28, 2010 2:35 am    Post subject: Reply with quote

Thanks for the help


The blue car is it's original colour. I first removed the booster to make space for the plenum but as you can think the brakes pedal was very stiff. I played around with different master cylinders till I found one that gave me the correct pedal feel. It has decent brakes but I need an upgrade it tends to fade after 3 or 4 fast laps. My budget is very tight and I do everything myself so I will look around till I find something suitable.

It used to glaze the pads very badly but I fixed that by slotting the disks. Heavy on pad wear but no more glazing http://mynetimages.com/album/lenkru/924?img=3a6b3dfd82.jpg
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3223
Location: Nelson, WI & Prescott, AZ

PostPosted: Sat Jul 23, 2011 9:42 am    Post subject: Reply with quote

For those EDIS aficionados, here's the distributor block-off method using block freeze plugs. yo.


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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Sat Jul 23, 2011 9:47 am    Post subject: Reply with quote

Brilliant!
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Sat Jul 23, 2011 10:36 am    Post subject: Reply with quote

One thing to add to the above...you could EASILY create a breather port by drilling a hole in the freeze plug and installing a nutted -AN fitting...

Brilliant. Love it.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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2mAn  



Joined: 23 Jul 2011
Posts: 27
Location: Seattle, WA

PostPosted: Sun Jul 24, 2011 3:18 am    Post subject: Reply with quote

i have a few questions about converting a 931 to EFI. what fuel rail are you using? also i know most people who convert to megasquirt (im from the VW world) use GM sensors. what about someone who ISNT using megasquirt, is there factory Bosch sensors we can use. Without going into too much datil im curious if its possible to run a 931 motor on a motronic OBD2 setup
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Min  



Joined: 04 Nov 2002
Posts: 2365
Location: Vernon, British Columbia, Canada

PostPosted: Tue Jul 26, 2011 6:42 am    Post subject: Reply with quote

ideola wrote:
One thing to add to the above...you could EASILY create a breather port by drilling a hole in the freeze plug and installing a nutted -AN fitting...


There is some interesting misconceptions about using the distributor area as a breather port, this in my opinion is a very bad idea. It will not work as expected at all. You'd be better off just drilling and tapping the valve cover (it is thick enough after all) if you require extra breather.

Min
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Min  



Joined: 04 Nov 2002
Posts: 2365
Location: Vernon, British Columbia, Canada

PostPosted: Tue Jul 26, 2011 6:45 am    Post subject: Reply with quote

2mAn wrote:
what about someone who ISNT using megasquirt, is there factory Bosch sensors we can use.


Not sure about your question, but I figured I'd better clear something up here. You can use megasquirt with any type of sensor that is resistor based for temperatures, however using the gm sensors is -easy- and cheap, which is why most people do it. If you know the temperature vs resistance curve of your sensor, you can simply program it into the megasquirt.

Min
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Tue Jul 26, 2011 6:45 am    Post subject: Reply with quote

Min wrote:
It will not work as expected at all.

Can you elaborate? Not sure I understand why...if you have negative pressure it should vent from there as well as anywhere else, would it not?

Of course, this is really a moot point on a 931 since it already has a breather update at the front of the head...
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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Min  



Joined: 04 Nov 2002
Posts: 2365
Location: Vernon, British Columbia, Canada

PostPosted: Tue Jul 26, 2011 6:51 am    Post subject: Reply with quote

ideola wrote:
Can you elaborate? Not sure I understand why...if you have negative pressure it should vent from there as well as anywhere else, would it not?


Sure, there is a 6mm(approximately, haven't measured it) drain hole at the bottom of the distributor housing that drains the oil that fills the distributor housing for lubrication purposes, this is the only hole that would allow the crankcase to 'breath'. During operation of the engine, it is filled with oil that is flowing from the rear bearing, it can't really 'breath' it would be not effective at all as a breather. It would have to be enlarged quite a bit before it would be effective.

If insufficient breathing is an actual issue on your motor(pressurized crankcase), what will probably end up happening is the oil from that cavity will end up being pushed back up the breather you've created and spilling out someplace. Rather than a slightly pressurized oil gallery being created back there which is what happens normally.

Min
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Tue Jul 26, 2011 6:54 am    Post subject: Reply with quote

Ahhh...makes sense. One of the GTRs had a breather fitting attached to the side of the oil filler boss.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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2mAn  



Joined: 23 Jul 2011
Posts: 27
Location: Seattle, WA

PostPosted: Wed Aug 03, 2011 5:27 am    Post subject: Reply with quote

Where are you guys getting your fuel rails from? Also what size injector is good for starting out? Im looking at upping the boost and was thinking about some 42lb injectors to go with it
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Wed Aug 03, 2011 6:16 am    Post subject: Reply with quote

2mAn wrote:
Where are you guys getting your fuel rails from? Also what size injector is good for starting out? Im looking at upping the boost and was thinking about some 42lb injectors to go with it


Perhaps you'll be interested in this thread:
Available Soon: Purpose-built Fuel Rail for 924/931
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3223
Location: Nelson, WI & Prescott, AZ

PostPosted: Wed Aug 03, 2011 6:57 am    Post subject: Reply with quote

I have a spare one of these, minus the cool fittings. 60 bucks delivered.


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'88 924S Track car.
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