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buldogo2
Joined: 13 Nov 2009
Posts: 79
Location: Nederland, Tilburg
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 Posted: Tue Dec 15, 2009 5:35 am Post subject: Converting EU 924 '81 to EFI and Big ass Turbo |
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hello everyman,
I’m Jeroen 22 yrs old and from the Netherlands, I’m not that good in English so forgive me for the bad grammar.
I'm looking around on this board for a while now, en got very interested in electronic fuel injection on the Porsche 924. Sins i had some old throttle bodies laying around of my zx6-r '05 i started drawing.
In a lather stage I’m planning to put a turbo whit it. But first things first.
Its still in a developing state, but figured you all will like the share  , the plan is that the cnc program for the intake will be don whit in a month.
Last edited by buldogo2 on Mon Nov 01, 2010 5:00 am; edited 2 times in total |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Tue Dec 15, 2009 5:54 am Post subject: |
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Oooooh! Pretty pictures  
So, how much of the 931 head have you actually plotted in the program???? Min might be interested in some of the geometry for the CAD stuff he's been working on recently...
Would LOVE to see some more renderings...
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erstwhile owner of just about every 924 variant ever made |
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buldogo2
Joined: 13 Nov 2009
Posts: 79
Location: Nederland, Tilburg
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| Posted: Tue Dec 15, 2009 6:09 am Post subject: |
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| ideola wrote: | Oooooh! Pretty pictures
So, how much of the 931 head have you actually plotted in the program???? Min might be interested in some of the geometry for the CAD stuff he's been working on recently...
Would LOVE to see some more renderings... |
thnx 
pretty much everyting I could measure from the outside, even the combustion chambers and coolandschanels, maybe with a tolerance of 0.1 to max. 1mm
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Tue Dec 15, 2009 6:44 am Post subject: |
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Wow, nice work, what program did you use to make those models?
Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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buldogo2
Joined: 13 Nov 2009
Posts: 79
Location: Nederland, Tilburg
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| Posted: Tue Dec 15, 2009 8:14 am Post subject: |
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| Min wrote: | Wow, nice work, what program did you use to make those models?
Min |
Tank you to
It's drown in Solidworks 2010. |
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flosho
Joined: 01 Jul 2004
Posts: 3155
Location: Eau Claire, Wisconsin
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| Posted: Tue Dec 15, 2009 8:41 am Post subject: |
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Nice! I'll take one of those intakes! :drool:
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Cedric
Joined: 27 Aug 2004
Posts: 2608
Location: Sweden
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| Posted: Tue Dec 15, 2009 8:35 pm Post subject: |
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Really nice CAD design ! The file for the head would be soooo nice to have  . Materials seems to be so much better looking in solid works compared to Solid edge. Hope you will proceed with this project !!
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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Rich H
Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK
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| Posted: Tue Dec 15, 2009 9:00 pm Post subject: |
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I have some very similar looking throttle bodies that I planned to fit with EFI - never got very far though:
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec |
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Dankoneon81
Joined: 30 Sep 2009
Posts: 136
Location: Mercersburg PA
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| Posted: Tue Dec 15, 2009 11:22 pm Post subject: |
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That looks sick!! So are you planning on making the filter cover out of carbon fiber or was that more for just the renderings?
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95 Neon gutted PnP MS2E turbo
94 Toyota sr5 the work horse
78 924 bone stock for now coming soon MS2E |
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etiennekuh
Joined: 31 Jul 2008
Posts: 34
Location: netherlands
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| Posted: Wed Dec 16, 2009 9:41 am Post subject: |
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Nice Solidworks drawing!!! Have you done some flow calculation on the intake?? I am alsow working with solidworks, it's a very nice program.
Etienne
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tuning is like a good hobby, it never gets bored |
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buldogo2
Joined: 13 Nov 2009
Posts: 79
Location: Nederland, Tilburg
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| Posted: Wed Dec 16, 2009 11:04 pm Post subject: |
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| etiennekuh wrote: | Nice Solidworks drawing!!! Have you done some flow calculation on the intake?? I am alsow working with solidworks, it's a very nice program.
Etienne |
Thnx for all the positive reaction, it's no render btw...just a screenshot .
I did some flow tests whit the runners on the pic's and strait runners. The air seems to go match better through it whit the runners on the pic's.
If someone wants the 3D CAD model, I who’d conceder to share them...only thing is that I won’t do it for free (sorry) but I think that dare is a small 40 hours of work in this.
The ones who send me a mail...I will replay them, just be patient
O and my plan is to make the air intake of carbon fiber indeed 
ps
CNC programs almost don |
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Martijnus
Joined: 29 Dec 2006
Posts: 2019
Location: Netherlands
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| Posted: Thu Dec 17, 2009 1:09 am Post subject: |
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nice pics!
If you like to chat about this all... you can add me at msn. My adress is somewhere in my profile.
I'm running itb's too, currently on a NA engine, but I'm building a turbo engine.
I'd recommend NOT using the injector locations on the TB's. The air velocity is highest at the stock injector locations. I can tell you, it makes a lot of difference. When I used the tb's injector locations, about 10% of my fuel came out the exhaust unburnt.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)
924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment  |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Thu Dec 17, 2009 1:25 am Post subject: |
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| Martijnus wrote: | | I'd recommend NOT using the injector locations on the TB's. The air velocity is highest at the stock injector locations. I can tell you, it makes a lot of difference. When I used the tb's injector locations, about 10% of my fuel came out the exhaust unburnt. |
Now that is a tasty little tidbit...
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erstwhile owner of just about every 924 variant ever made |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Thu Dec 17, 2009 4:59 am Post subject: |
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| ideola wrote: | | Martijnus wrote: | | I'd recommend NOT using the injector locations on the TB's. The air velocity is highest at the stock injector locations. I can tell you, it makes a lot of difference. When I used the tb's injector locations, about 10% of my fuel came out the exhaust unburnt. |
Now that is a tasty little tidbit... |
Well, its certainly interesting. I don't see how having the injectors in a bad location would cause fuel to stop being burnt up in your combustion chamber though. I can see it being hard to tune, due to the amount of wall wetting going on in your manifold, it would take a bit for the fuel to reach equilibrium with the amount of fuel coming off the walls vs the amount collecting on them. But causing that fuel to become unburnt? sounds like you may have just had to lean it out in the different injector location. Which is itself an interesting effect.
I personally believe the best injector location is as close to the port as possible, pointing 30 degree's from the port axis down the port throat.
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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flosho
Joined: 01 Jul 2004
Posts: 3155
Location: Eau Claire, Wisconsin
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| Posted: Thu Dec 17, 2009 6:23 am Post subject: |
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Maybe the injectors are not atomizing the fuel and that's why there was additional fuel being left unburned.
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