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Mike9311
Joined: 14 Dec 2004 Posts: 1678 Location: Chicago-ish
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Posted: Mon Jan 03, 2022 2:18 am Post subject: |
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peterld wrote: | Wow!!! |
Wow, indeed! Really love this thread _________________ 1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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jazz guy
Joined: 26 Nov 2002 Posts: 434 Location: Colorado
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Posted: Tue Jan 04, 2022 2:19 am Post subject: |
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Great work Britain, you've been busy! Makes me tired just following your progress...
but at the same time, inspired as well!
Maybe I missed it, but can you detail a little more about what it took to adapt the 996 rear hubs?
Cheers! Brian _________________ '81/'81/'82 |
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Cedric
Joined: 27 Aug 2004 Posts: 2600 Location: Sweden
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Posted: Tue Jan 04, 2022 6:20 am Post subject: |
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This starts to look really proper, i think you got the aero bits really well sorted, probably one of the best ive seen on this platform. If you have time you might want to try reducing the apertures in the front a bit, it will have a pretty large impact on the amount of front downforce according to the wind tunnel data ive seen. Could be easily tested with some ducktape and some measurements. _________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 05, 2022 4:07 am Post subject: |
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Cedric wrote: | This starts to look really proper, i think you got the aero bits really well sorted, probably one of the best ive seen on this platform. If you have time you might want to try reducing the apertures in the front a bit, it will have a pretty large impact on the amount of front downforce according to the wind tunnel data ive seen. Could be easily tested with some ducktape and some measurements. |
Understood...problem is that we run endurance racing so the races are ~8hrs long. We have to balance aero with cooling requirements to keep everything running well for an extended period of time. |
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Cedric
Joined: 27 Aug 2004 Posts: 2600 Location: Sweden
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Posted: Wed Jan 05, 2022 6:38 am Post subject: |
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Britain wrote: | Cedric wrote: | This starts to look really proper, i think you got the aero bits really well sorted, probably one of the best ive seen on this platform. If you have time you might want to try reducing the apertures in the front a bit, it will have a pretty large impact on the amount of front downforce according to the wind tunnel data ive seen. Could be easily tested with some ducktape and some measurements. |
Understood...problem is that we run endurance racing so the races are ~8hrs long. We have to balance aero with cooling requirements to keep everything running well for an extended period of time. |
Yeah, im well aware of the challenges with endurance racing, it's tough and heat is always the enemy. Though bigger is not always better for air ducts, they could maybe work as well with smaller apertures. But it do take some work to mesure and analyse that. _________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 05, 2022 6:48 am Post subject: |
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Understood...which ducts are you referring to?
Brake Ducts, Radiator/Intercooler, Oil Cooler, or Turbo Cooler? |
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:28 am Post subject: |
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I see that is has been almost a year since I updated this thread. Before I unveil the crazy updates currently in-progress, I figured I should catch everyone up on the in-season work.
At the beginning of the season, we did a quick engine refresh. Mostly preventative maintenance including bearings, head job, exhaust valves, etc.
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:29 am Post subject: |
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We have also had a reoccurring problem with the clutch throw-out bearing in which it would extend too far in the assembly and blow out the o-ring. In addition to a better clutch stop in the car, we made a guide tube and pressed it into the assembly...much better.
A problem that we encountered after adding the bigger diffuser is it actually worked as a megaphone and made us just about blow the sound limit at the final race of the year. To address this, we routed the wastegate dump back into the exhaust flow and split it into dual mufflers. Bonus...the driver now gets to hear that sweet 5cly melody.
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:29 am Post subject: |
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Another side-effect of adding the diffuser is reduced airflow around the transmission and therefore higher fluid temps. To help in this department, I found a 964 Oil cooler that will serve as a bigger trans cooler and is about 3x more surface area than the previous trans cooler. It is fed with two 3" tubes from NACA ducts on both rear windows and ducted out the back of the car.
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:30 am Post subject: |
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When installing a rebuilt transmission at some point in the season, we noticed a lot of slop in the shift linkage. This was caused by a warn out shift linkage bushing. So some quick work on the lathe and a bit of tig welding and it now has a heim joint back there. Issue fixed.
Couple of great pics from a race at The Ridge here in the PacNW to remind us of why we keep doing this stuff
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:30 am Post subject: |
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An issue that has forced an unscheduled pit stop on a number of occasions is grass clogging up the radiator inlet after an off track excursion. The splitter makes a perfect lawnmower and the resulting clipping fill the screen. I remember seeing '70's racecars with a curved inlet screen so I attempted to create one for our car to alleviate this problem. Although it is tough to see in the pictures, it actually doesn't look hideous.
I have been wanted to build proper brake ducts for a while now since we switched to the 996 spindles...however the area is tight and there isn't much room. Finally got an afternoon this past weekend to knock them out. This should help direct the majority of the air to the rotor and down into the bearing area.
*Ignore the crappy aluminum welding...this was a science experiment.
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:31 am Post subject: |
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One benefit of fiberglass and carbon fiber panels is that they are fairly easy to repair...especially parts where I made them myself and I have the molds. At a wet and rainy race in Portland we had a few "incidents" that required some repair. Here are some before/during/after pics.
Just a bit of oil in the intake stream which was ejected all over the engine bay thru the atmosphere BOV over an 8hr race made for quite a bit of grimy mess. Got a Turbosmart recirculating BOV and plumbed it back into the intake tube to try to alleviate that issue. Didn't have any 90deg bends so I pie cut that **** SEMA style!
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Britain
Joined: 26 Nov 2013 Posts: 285 Location: Cornelius, OR
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Posted: Wed Jan 18, 2023 9:31 am Post subject: |
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The next round of updates are currently in-progress...it is a big one...and I will post pictures soon. |
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Mike9311
Joined: 14 Dec 2004 Posts: 1678 Location: Chicago-ish
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Posted: Wed Jan 18, 2023 10:32 am Post subject: |
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I seriously can't wait, this car is awesome
Bring on the pics! _________________ 1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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morghen
Joined: 21 Jan 2005 Posts: 8868 Location: Romania
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Posted: Wed Jan 18, 2023 5:28 pm Post subject: |
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Thanks for sharing, this is amazing to follow. _________________ https://www.the924.com |
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