924Board.org

[John Brown]

A while back there was a discussion about prepping a 924 and to what (light) weight the car could go. While we had some engine problems that prevented running; I did get a chance to weigh the little 924 fully prepped with cage, extingisher, etc. Qualified for the NASA logbook.

Presently at 2200 lbs without driver.

This is NOT an ITA (or GTS therefore) legal car. But it demonstrates what can be done for $$ FREE $$ to go have fun. With a track only car.

The complete interior is gone. 1 Racing seat. OG cage. Headlights motors mechanism and wiring stripped. Actualy, I stripped out LOTS of wiring - but its a free mod. Windows (and electric motors) gone. Warmup stuff on the motor gone. Turn signal and wiper stalk etc gone.

The car is on the original (lighter) 14X6 4 bolt wheels. This also represents the smallest diameter we can get on the car. With 205-55 Hoosiers mounted indications are it will do fine. Will know more when we get the motor fixed up and run it harder.

The one cost item is a lexan windshield. The original was already broken. However, I believe you can make this weight (2200) with the glass in place. I believe on this car we may make 2150 with some elbow grease. (Much of the sound proofing is still in - ran out of time. And undercoating of course).

John

[AppleBit]

is a lexan windshield legal on the street?

Is it like a normal windshield?

I think I can get one of these at www.gt-racing.com right?

Can you use wipers on a lexan windshield?

[jesse wall]

Sounds great John what year 924 is it ?
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jesse wall 'new driver' , 87 924s

[924RACR]

Congrats! Actually, we would easily be able to classify it in GTS, although it'd probably run in GTS2 with the 944. Maybe. I'd have to check the ratios. Still, it wouldn't be a problem to run. We handle all the way up to PCA GT cars.

Anyway, back to your car. So, you haven't yet done any fiberglass or lexan, excepting the windshield, huh? Wow. Proves you right, sure enough, about how light those early cars are!

What did you run into in the way of problems at the track? Jeremy mentioned you were having trouble. Anything I can help with?

Jeremy and I are looking at the possibility of meeting up at Beaverun for the Labor Day weekend race...

I have my next race July 19-20th, weekend after next... and this is the state of my car!
http://www.vaughanscott.com/rebuild/carparts2_small.jpg
http://www.vaughanscott.com/rebuild/empty4_small.jpg

Got a lotta work to do...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[924RACR]

Yeah, when you add in driver weight (est average of 180), that will put you at a power/weight ratio of 19 or so (depending on exactly how much power you're making, but a reasonable estimate). That would still be just within the GTS1 envelope, although close. I'm tipping the scales at 2550 with driver, so 2390 dry weight roughly. Still have yet to dyno the car, though I don't expect more than about 130hp tops.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[jjadczak]

John, get that car fixed! I want someone to play with! Thank you for all your help this past weekend. It was nice to work with you. It's really too bad your driver Jerry didn't get any true track time. Sunday's race was really wild. I did have a 944 to play with but this was his first real race. I beat him and posted my fastest time (1:38.537). In comparrison some of the slower 944's were posting 1:36's. I think were close and I agree with you with stripping more weight we could probably be close to those 944's. Our car, for the benefit of other's is 2420 pounds w/o driver and just a couple gallons of fuel. Anyway back to the report. The temp was 119 degrees on the starters stand at 4PM!! in the race around 4:45 I was hot hot hot. About half way through the race it was red flagged b/c three Miatas were racing to hard and one rolled down through the chute. We sat on the course for about 10 min. and then had to sit in the pits for another 10-15 min until they cleaned it up. Other than that, I didn't want this 944 to pass so I drove it like I stole it. I think then is where I posted my fastest lap. Is there any chance John would consider coming to the Beav with Vaughan and I on Labor Day weekend?

[jesse wall]

The stock lift for 924 2 liter cars is .470 for cars 79 to 82 and for 77 to 78 is .465 what would be lift with 10/ 1 compression to ask for in f production guidelines , what compression for g p and what lift ? Jesse
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jesse wall 'new driver' , 87 924s

[John Brown]

Jesse:

By my calculation increasing the lift on the 924 does NOT gain much if anything. The issue is that the valves themselves are of a size (small) that increasing lift is on the decreasing benefits end of modifications.

Messing with valve timing, duration and overlap, gives some gains. But you are limited on that end by the use of a mechanical air flow measurement disk.

Again. If folks want to increase the power of the 924 first take a look at what Porsche did. For example with the DP cars. And what they did was stick a 931 head on with pistons made to match.

As one of my most knowledgable mentors says about this car, "It is what it is".

John

[jesse wall]

John you are so right , but the scca will only let you put the 931 head on in gt cars, I just want to goose power up a little in a limited prep car for maybe f production , will do enduro next year with wa , lawerance and any other local 924 buff, we want to go production so we can go lighter and prettier, we have a good chance to have a lot of fun and are learning a lot if guys put 9.3 pistons and mill heads they are at 9.8 as you talked about before , we want to add a little cam and go racing thanks , oh what cam ? jesse
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jesse wall 'new driver' , 87 924s