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Porsche 924 Racecar Build Thread (AAN Conversion)
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924RACR  



Joined: 29 Jul 2001
Posts: 8298
Location: Royal Oak, MI, USA

PostPosted: Thu Sep 19, 2019 9:58 pm    Post subject: Reply with quote

Very nice work.

Now thinking about endplates for that splitter, instead of those dive planes...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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TJC  



Joined: 04 Apr 2010
Posts: 751
Location: Central-ish Arizona, USA

PostPosted: Fri Sep 20, 2019 1:01 am    Post subject: Reply with quote

Very impressive!
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'95 BMW 318i/5 ..."Pearl"
'80 Porsche 924 Turbo..."Pogo"
'81 Porsche 924 Turbo...Parting!
'87 Porsche 944 NA... "Liebchen"
'02 Porsche Boxster..."Sunbeam"

Still on the Prowl!

www.ttrs1.com
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Britain  



Joined: 26 Nov 2013
Posts: 176
Location: Hillsboro, OR

PostPosted: Fri Sep 20, 2019 1:38 am    Post subject: Reply with quote

924RACR wrote:
Very nice work.

Now thinking about endplates for that splitter, instead of those dive planes...


The diveplanes were a last second "bullshit" generator

In the end, the front-end felt very stable. Those diveplanes don't extend past the front tires which stick over very far. I agree, things could be better...and I will make some changes.

-Britain
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 902
Location: Maysville, Colorado

PostPosted: Tue Oct 08, 2019 3:09 am    Post subject: Reply with quote

Saw in one pic that you are using a very small brake booster and single master cylinder. I have the 944 brakes, MC and booster and would love to have a smaller booster as I could really use the additional space. A 924 7" MC will fit with a spacer to get the rod length right. Could I ask what you are using? I realize your entire system is much bigger. Pedal pressure is not an issue.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
cricketdesigns.com
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Britain  



Joined: 26 Nov 2013
Posts: 176
Location: Hillsboro, OR

PostPosted: Tue Oct 08, 2019 3:50 am    Post subject: Reply with quote

MikeJinCO wrote:
Saw in one pic that you are using a very small brake booster and single master cylinder. I have the 944 brakes, MC and booster and would love to have a smaller booster as I could really use the additional space. A 924 7" MC will fit with a spacer to get the rod length right. Could I ask what you are using? I realize your entire system is much bigger. Pedal pressure is not an issue.


I am using a stock vacuum booster with a 944 master cylinder. Pedal pressure is perfect, even with the 996 calipers I am now running.

-Britain
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1934
Location: MI

PostPosted: Fri May 15, 2020 5:01 am    Post subject: Reply with quote

I can't believe I missed this thread..
That is some absolutely amazing chassis work..

Britain wrote:
After several years of blowing up 931 engines, we finally decided to do an engine swap to an Audi AAN 5-Cylinder.


What happened to the 931 engines? For what reason did they keep blowing? How were you running them?
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924RACR  



Joined: 29 Jul 2001
Posts: 8298
Location: Royal Oak, MI, USA

PostPosted: Fri May 15, 2020 6:16 am    Post subject: Reply with quote

I'm reminded to ask - what drove you to rotate the throttle body on the 931 engine 90 degrees? Looking to do similar IC pipe routing on my street car with the EFI conversion and IC install, but I don't see anything that would drive that (yet)...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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Britain  



Joined: 26 Nov 2013
Posts: 176
Location: Hillsboro, OR

PostPosted: Sat May 16, 2020 2:56 am    Post subject: Reply with quote

Fasteddie313 wrote:
I can't believe I missed this thread..
That is some absolutely amazing chassis work..

Britain wrote:
After several years of blowing up 931 engines, we finally decided to do an engine swap to an Audi AAN 5-Cylinder.


What happened to the 931 engines? For what reason did they keep blowing? How were you running them?


The stock engines were running on the ragged edge for 8+ hr races. The combination of wanting/needed more power and running them hard for so long made for blown engines. I am sure that we could of spent large amounts of money trying to make things better, but they don't flow that well, they don't cool that well, and they vibrate to all hell. The more modern Audi 5-cyl fixes a lot of those problems.
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Britain  



Joined: 26 Nov 2013
Posts: 176
Location: Hillsboro, OR

PostPosted: Sat May 16, 2020 2:57 am    Post subject: Reply with quote

924RACR wrote:
I'm reminded to ask - what drove you to rotate the throttle body on the 931 engine 90 degrees? Looking to do similar IC pipe routing on my street car with the EFI conversion and IC install, but I don't see anything that would drive that (yet)...


On the original 924 engine, I was using the S2 intake manifold to get the round throttle body mount and I was using a Subaru 2.0L throttle body. I needed it to face that direction because that was the way the throttle cable mounted.
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924RACR  



Joined: 29 Jul 2001
Posts: 8298
Location: Royal Oak, MI, USA

PostPosted: Sat May 16, 2020 3:49 am    Post subject: Reply with quote

Well I just discovered another reason today why you might want to rotate it! LOL

Made a pretty little welded aluminum adapter plate to bolt on the Volvo TPS to the S2 throttle body. Then I bolted the throttle body onto the intake... only to realize that the TPS was hitting the intake, and I'd never get the connector on it!

So I shortened the shaft and simplified my mounting plate to be 1/4" thinner, clear of the intake.
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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