924Board.org

Fifty50Plus · Posted: Tue Jan 12, 2021 4:36 am Post subject:

SCCA lumped all the 924s on one page of the rule book so we can pick and choose best options (LSD, vented brakes, rear tail, either gearbox) but the weight was selected by a "committee" (probably after looking to see which MFRs paid money to the club and which didn't). The other major rue is "If it doesn't say you can, you can't". There is a global engine prep section that pretty much says you must use stock parts without lightening or modifications except for balance; no porting but any exhaust is okay. Suspension is free but can't be substituted (can't put coil overs on the rear for the 924).
Aero wise, I've got a small 935 style rear view mirror. We are not allowed any other body mods.
I raced BMW 2002s in the same class in the past and had more horsepower but the body shape and frontal area limited the max velocity on longer tracks.
All in all, I like racing the 924 and cost wise it's similar to the BMW, cheaper than the Alfas, more expensive than the Hondas and VWs and more reliable than all of the others.
If SCCA lowered the weight, there would probably be a bunch more 924s showing up on the grid since the racers would pay more attention to the lap times being posted.

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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car

Karlio · Joined: 17 Nov 2019 Posts: 15 Location: UK

Blimey, why would you race in that series, that is some serious disadvantage. 2495lbs equates to 1132kg here. Dry(ish) weight of our cars is around 930kg/2050kg,add chubby driver, and a bit of fuel I get in at around 1020kg post race.

Fifty50Plus · Posted: Tue Jan 12, 2021 9:53 am Post subject:

It is a competitive class...we usually have 10-15 cars in our class and we run with another class that has almost as many. As much as I bitch about it, I was the series champion in 2018 and 2019 - 2020 was a bust. I just keep getting honked off with the lack of SCCA respect for Porsches. The only trophy they keep giving us is lead.
_________________
1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car

anthonimartini · Joined: 17 Feb 2020 Posts: 28 Location: portland oregon

hey fifty50, you seem quite knowledgeable. would you happen to know if the early 944 pedal assembly is the same as 1980 931? im converting my 77 to a snailshell trans using the rear torsion assembly, torque tube and bellhousing/clutch from the 931. im going to bolt all that up to my 95hp lump while i rebuild the 931 engine using a td04 turbo. im unsure of what exactly i need to order to adapt my cable clutch parts to use the hydraulic stuff.
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saving a 1977 martini ... please help! (done)
87 924S
77 924 Safari (931 swap)

morghen · Joined: 21 Jan 2005 Posts: 8274 Location: Romania

I did a similar upgrade a long time ago, the 944 clutch pedal sub-assembly can be fitted to the 924 in order to run the 931 bellhousing and hydraulic clutch.
The brake pedal and accelerator pedal can be kept from the 924.
However you need to drill the firewall for the bolts holding the master cylinder, and while you are there you really have to build a reinforcement sheet of metal that doubles the firewall in the area holding the master cylinder, otherwise it will crack and obviously cause the clutch to not work properly and then quickly destroy your precious snailshell.

For the conversion you need:

-931 bellhousing complete with slave cyl and hydraulic line.
-931 master cyl complete with reservoir and hoses.
-931/944 clutch pedal assembly (bolts on to the 924 body).
-firewall brace plate, i made my own(after firewall cracked) but you can either make your own or buy one from only944.
My brace plate was considerably smaller than the one from only944(did not go under the brake booster) and it held fine.
I made it out of 3mm thick Aluminium.

https://www.only944.com/partscatalog/only/firewallbrace/
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SUPERCHARGED Ruby-sh 924

safe · Joined: 18 Mar 2017 Posts: 210 Location: Sweden

anthonimartini · Joined: 17 Feb 2020 Posts: 28 Location: portland oregon

thanks morghen! the pedal box was the last thing i needed! cant wait to get the LSD equipped G31 in my car!
im going to build a flange to mount a garret t3 to the stock NA manifold and run the 931 WUR with the 77 cis system just as an experiment, my 77 engine is in great health so i think it might actually work out pretty well. hell i might even just drive that setup for a while if it is fast enough and reliable. if not the the 931 engine will be ready pretty quickly. im going to use 88mm VW flattops with that and planned on also building an adapter flange to mount the garret to the 931 manifold.
_________________
saving a 1977 martini ... please help! (done)
87 924S
77 924 Safari (931 swap)