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ArvidW's 924NA MS-II Kompressor Project
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Tue Jan 08, 2013 6:35 am    Post subject: Reply with quote

An extra psi is always nice

My BOV is indeed adjustable and I've had it on the hardest and softest setting. The boost curve remained the same so it's probably leak free.
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Porsche 924 2.0 Kompressor 136.1wHp @ 5650rpm / 201.9wNm @ 3900rpm (dyno @ dp-engineering.nl)
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Fri Feb 01, 2013 6:45 am    Post subject: Reply with quote

I have some problems with the front strut mounts on my car, one of them makes a clucking noise when driven over a speedbump.

As I don't want to spend 220dollar on 2 rubber parts (OEM part NLA) I took a close look at some topics on rennlist, someone sugested to use a 1988 VW Fox part. However the VW Fox was never sold in europe before 2000 so I found a VW Caddy part:



http://www.ebay.co.uk/itm/VW-Caddy-Mk2-Skoda-Favorit-Felicia-Front-Strut-Mount-6U0412355-/400340258812?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5d36238ffc

Tomorrow I'll go to a local part shop and see whetter they have 2 of them laying around, otherwise I'll take the (15euro) guess and hope the ebay ones will fit.
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Porsche 924 2.0 Kompressor 136.1wHp @ 5650rpm / 201.9wNm @ 3900rpm (dyno @ dp-engineering.nl)
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leadfoot  



Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia

PostPosted: Sat Feb 02, 2013 2:46 pm    Post subject: Reply with quote

or you could do something like this,
http://www.ebay.com.au/itm/Porsche-924-944-968-Front-Camber-Caster-Adjustment-Plates-Kit-/120962337576?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c29eacb28
I bought these and they are of a decent make, don't ask me how long they will stand up though...
Stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...
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maler  



Joined: 17 Dec 2012
Posts: 1
Location: Kazahstan - Karaganda

PostPosted: Mon Feb 04, 2013 11:31 pm    Post subject: Reply with quote

Hello! you put the gearbox of AUDI? as solved the problem with the left bracket? can you show?
I also gearbox from AUDI, AUZ after 89, had to make a mount, photo unfortunately no
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Sat Feb 09, 2013 5:10 am    Post subject: Reply with quote

@Maler,

Sorry for the late response. I don't have a picture of the bracket but I made this fabulous paint drawing:




I used the original bracket for the rubber mount and bolted it to a more-or-less horizontally mounted strip of steel (30*6mm). That strip is welded to another strip (30*6mm) and that second strip is bolted to the gearbox.

It is sufficiently strong, for my dyno run on the dynapacks we had to jack up the car underneath the gearbox and the bracket didn't bend or break.
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Porsche 924 2.0 Kompressor 136.1wHp @ 5650rpm / 201.9wNm @ 3900rpm (dyno @ dp-engineering.nl)
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Jeremy924  



Joined: 21 Jun 2012
Posts: 25
Location: Phoenix,AZ

PostPosted: Sun Feb 17, 2013 3:21 pm    Post subject: Reply with quote

Wow! What a good read! Your Porsche has really come a long way! Congrats
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Tue Mar 12, 2013 7:11 am    Post subject: Reply with quote

@Jermey924, thanks!

After the dyno time @ dp-engineering.nl I'd asked Pieter how he sets up the IAT based timing retard in his projects. Apparently the IAT based timing retard has to be much more severe than the standard settings in Megasquirt. Something in the region of: 40-60C (1gr / 10C), 60-80C (2gr / 10C), 80-120C (4gr / 10C). I've made a nice little semi-exponential curve of that because it looks good :-p

Anyway, I've corrected the ignition map so it gives the same advance as we had on the dyno at those particular IAT's. Now it has a lot more power when the supercharger has just been switched on and it gradually decreases as IAT's rise. This is just a matter of seconds as the air heats up pretty quick. (Thankfully the "open type" IAT sensor has a very quick response)


I've found a nice recirculation valve which in fact is a vaccuum opperated throttle valve from a 2.5 Mitsubishi L200. With slight modifications it can be used as a bypass valve for a supercharger. At 18euro's it is significantly cheaper than one from a mini or whipple charger.





However because I'll have to cut up my intake piping for this recirculation vale anyway I'm thinking of adding an intercooler. I will probably copy RC / Endwrench solution is most convenient for my setup:

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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Sun Mar 24, 2013 7:59 pm    Post subject: Reply with quote

I've bought an intercooler on Ebay with the pipes at the top. The install will be in "RC / Endwrench" style with the pipes coming through holes in the front panel.


It has a 330x280x76mm core and 2.5" connections. I've already spaced the radiator at the bottom 80mm back. However I could not find any 80mm wide aluminium U-profile so I bolted two L-profile strips together.




Now I have to start cutting 65-70mm big holes in the bodywork, not looking forward to doing that
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WEASEL149  



Joined: 19 Aug 2005
Posts: 595
Location: UK, Sheffield

PostPosted: Sun Mar 24, 2013 11:59 pm    Post subject: Reply with quote

Perfect. That should do the job nicely
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Mon Mar 25, 2013 3:25 am    Post subject: Reply with quote

Thanks, according to ebay "it is good for 400HP" so it will probably be fine upto 200HP


This afternoon I drilled holes in the front panel for the intercooling piping. It took some time as I didn't have the correct drill bit. I ended up perforating the metal with around 80 small holes and finished everything off with a pneumatic grinder. It is time consuming but removal of the front panel was not necessary.




Time to order some 2.25" or 2.5" bends and couplers.
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Mon Mar 25, 2013 3:48 am    Post subject: Reply with quote

No hole-saws in your neighborhood?

Love the project, I'm gonna hack into my CGT project for a Neon SRT-4 intercooler. Same cubic inch displacement as the 951 version. But, thinner and longer. Have two 951 versions as backup however~! The GTS front end has plenty of room for it too.
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Mon Mar 25, 2013 4:50 am    Post subject: Reply with quote

My neighbor does some woodwork so he probably has one laying around, however I'm not so sure he will like it if I return a blunt one from cutting metal.

The SRT-4 intercooler looks like a nice piece, however are you sure it isn't too wide for the 924 nose panel? You don't have to worry about the pop up headlights so that probably makes it a bit easier.
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Mon Mar 25, 2013 8:02 am    Post subject: Reply with quote

Not sure yet, but I am going to put it lower in the GTS nose versus the traditional spot usually used for the 951. I also have a 1983 924 Carrera GT top mounted intercooler currently installed in the car. Paul is looking for that for his GT car and am thinking of selling it to him. He needs it more than I do. So, need to come up with something to replace it. I'm using Megasquirt II and EDIS so, do not have the CIS system blocking the front end.
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'88 924S Track car.
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leadfoot  



Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia

PostPosted: Mon Mar 25, 2013 2:15 pm    Post subject: Reply with quote

FYI it's going to be alot of fun doing up the clamps on top of the intercooler...
curious to what size the bypass valve is?? The valve you show looks alot more compact than the one I made.
Stu
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Arvidw  



Joined: 20 Sep 2009
Posts: 227
Location: The Nederlands (Europe)

PostPosted: Mon Mar 25, 2013 5:48 pm    Post subject: Reply with quote

Thanks for the heads up, I'll try doing up those clamps only once during the build.

The Mitsubishi L200 4D56T throttle has a throttle plate with a diameter of around 52mm. The flange-to-flange thickness is around 40mm. If you want to have more dimensions let me know, I'll take some measurements for you.
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