SC project

[RT3]

Hi

I've just bought an SC which I'm going to make into a bit of a retro track car type thing, it's from California in great condition but has no interior. I think I'll upgrade the brakes I've heard I can put Boxster brakes on, is this a good idea?

Other things I'm going to do, engine is getting top end rebuild, 964 cams, new exhaust system and PMO carbs. I'm taking the impact bumpers off for fibre glass ones, new interior and sort out the suspension and bushes. What should I do suspension wise? What other upgrades are worthwhile?

I know these cars are appreciating I will keep all the bits so I can make it original again if need be one day.

All suggestions are welcomed!

[GT Two]

RT3 said:

Hi

I've just bought an SC which I'm going to make into a bit of a retro track car type thing, it's from California in great condition but has no interior. I think I'll upgrade the brakes I've heard I can put Boxster brakes on, is this a good idea?

Other things I'm going to do, engine is getting top end rebuild, 964 cams, new exhaust system and PMO carbs. I'm taking the impact bumpers off for fibre glass ones, new interior and sort out the suspension and bushes. What should I do suspension wise? What other upgrades are worthwhile?

I know these cars are appreciating I will keep all the bits so I can make it original again if need be one day.

All suggestions are welcomed!

Sounds like a great project, I have done a few similar.

You can go for Boxster brakes but I never think they look that good, modern brakes on such a lovely old car. Go for later 3.2 brakes. If you are taking the weight out these will be plenty good enough.

For body parts call Mark at EB Motorsport, a really nice guy to deal with and great products. Just what you are looking for.

http://www.eb-motorsport.co.uk/products.asp?type=1...

For suspension go for Bilsteins or take a look at Elephant racing, these guys will supply the Billsteins and all of the other items you will need.

It will make a superb car if done right!

Good luck!

[g7jhp]

Suggest getting yourself over to impactbumpers.com where you'll find a wealth of knowledge on updating SC's.

[ArrowSC]

With some simple mods they are fun on track, but the most obvious omission on your list is an LSD, which makes a huge difference plus get someone with suitable 911 experience to set the geometry.

I was advised that as I was losing some weight, the standard brakes in good shape and with decent pads and fluid will be fine on track. Mine has Motul 600 and DS3000 pads, and no problems to date.

My SC has been done on a budget but has lightweight bumpers and seats, Bilstein Sport dampers, 27mm rear torsion bars, super pro bushes throughout, and 7&8x15 Fuchs which are both lighter than 16s and lower the gearing. My engine is standard apart from backdating the exhaust with SSI heat exchangers which breathe better and save some weight at the back, together with ditching the air pump.

[RT3]

ArrowSC said:

With some simple mods they are fun on track, but the most obvious omission on your list is an LSD, which makes a huge difference plus get someone with suitable 911 experience to set the geometry.

I was advised that as I was losing some weight, the standard brakes in good shape and with decent pads and fluid will be fine on track. Mine has Motul 600 and DS3000 pads, and no problems to date.

My SC has been done on a budget but has lightweight bumpers and seats, Bilstein Sport dampers, 27mm rear torsion bars, super pro bushes throughout, and 7&8x15 Fuchs which are both lighter than 16s and lower the gearing. My engine is standard apart from backdating the exhaust with SSI heat exchangers which breathe better and save some weight at the back, together with ditching the air pump.

Thanks I was planning on getting the geo sorted when its done, good point re the LSD I'll add that to my list! Do you know how much your car weighs?

[ArrowSC]

Sorry, I havent weighed it, but that reminds me I also removed the heavy tea-tray spoiler and swapped to a ducktail.
This thread needs pix, this was mine at Spa a couple of years ago

[RT3]

Here she is!

[david hockney]

RT3 said:

Here she is!

I love the colour- it looks great!
Did it leave the factory that colour?

[BertBert]

did it leave the factory with that ride height?

Good luck on your project. I'm also thinking of pepping up my SC and trying a megasquirt on triumph triple ITBs. Together with a better exhaust and more aggressive cams, should up the performance quite a lot.

I was also thinking about the flywheel. Do people ever fit a lightened one?

Bert

[thegoose]

ArrowSC said:

With some simple mods they are fun on track, but the most obvious omission on your list is an LSD, which makes a huge difference plus get someone with suitable 911 experience to set the geometry.

I was advised that as I was losing some weight, the standard brakes in good shape and with decent pads and fluid will be fine on track. Mine has Motul 600 and DS3000 pads, and no problems to date.

My SC has been done on a budget but has lightweight bumpers and seats, Bilstein Sport dampers, 27mm rear torsion bars, super pro bushes throughout, and 7&8x15 Fuchs which are both lighter than 16s and lower the gearing. My engine is standard apart from backdating the exhaust with SSI heat exchangers which breathe better and save some weight at the back, together with ditching the air pump.

The thing that let my competitive, winning, SC race car down were the brakes. With expensively tailor made alloy ducts (using front fog openings) and expensive aero-grade tubing to the discs we got them acceptable when running Pagid RS29 yellow (got some RS19 and they were no good), everything else over-heated. Car was made to finish with enough fuel to meet or exceed the stipulated minimum of 1175kg with me in it, so circa 1075kgs without (based on what I weighed at the time with all my kit on) and was a standard 204bhp version, although it produced 214bhp (was actually slightly de-tuned to that, by adjusting the distributor timing, in order to comply with the rules, which allowed for no more than 105% of factory stated bhp),

One thing that could have improved the brake cooling would have been to make a clamshell type duct to surround the disc with (roughly the dimensions of a caliper, mounted opposite) and connect the duct pipe work straight to - but no-one has a pattern for one and everyone agreed they'd take a full day for a skilled guy to fabricate (that may have been each too).

Cooling aside, they were still no match at all for the 944S2's braking capabilities though. Bigger discs and Boxster calipers would be a very cheap way of making the car a lot faster around a lap.

Another (cheap, honestly!) to add to your list is the air box mod that prevents the chance of the air box blowing to bits if it backfires when starting - I think the mod is a blow-off valve of some kind.

[ArrowSC]

thegoose said:

The thing that let my competitive, winning, SC race car down were the brakes.

I don't doubt that for a moment, but I understood the OP was talking about a fun road/track car rather than racing. Apologies if I misunderstood.
Out of interest, do Boxster brakes fit under 15" wheels?

thegoose said:

Another (cheap, honestly!) to add to your list is the air box mod that prevents the chance of the air box blowing to bits if it backfires when starting - I think the mod is a blow-off valve of some kind.

Good point and available through Type911 etc, but OP mentions fitting PMO carbs in place of CIS.

[BertBert]

I had Boxster brakes on my 73 RS Rep under 15" wheels - that was based on a '73 car.
ETA that worked on Fuchs 6s/7s and 7s/8s IYSWIM.

[BrewsterBear]

Sounds very similar to my project this winter. I've had my current SC for a few years and it was starting to get tired cosmetically and mechanically. I've just about stripped it down to the shell in the last 2 weeks. Over winter it's getting the following;

• Full shell restoration getting rid of rust followed by a respray and underseal.
• Engine rebuild with Mahle Max Moritz P&Cs increasing the bore size to 98mm creating a short-stroke 3.2. Using 964 cams and a lightweight flywheel, but retaining the CIS for now. This may be swapped to PMO ITBs and EFI in the future but funds don't allow at this time.
• Gearbox rebuild with new synchros on second and third.
• RS carpets throughout with no rear seats. RS America door cards too.
• Original, incredibly heavy, tombstone seats going in favour of some Cobra Le Mans 80's style at less than half the weight.
• Tea tray (how heavy?!?!) replaced with 964 electric spoiler.
• Impact bumpers replaced with EB Motorsport SCRS items at a fraction of the weight (These are very good quality. I did a test fit and they needed very little fettling to fit)
• Suspension refresh with Bilstein B6 Street Sports dampers and Super Pro bushes all round.
• Headlights changed to D-Zug HID Projectors.
• 16" 7&8 Fuchs refurbed to RSR style.

I have previously done the heat exchanger backdate to SSIs and the brakes (calipers, hoses, etc). I'm hoping to have it all back on the road for next summer. I'm looking for a kerbweight of 1050kg or less, but we'll see. It won't be a track car, just a hotrod, B-road blaster to my own spec pushing 240bhp with a zingy engine.

A few pics;

[BertBert]

can you go high compression and twin spark now with the CIS?

[BrewsterBear]

Phew! I thought I'd killed the thread...

10:1 is fine with the Max Moritz pistons with single plug heads and CIS as long as you use Super Unleaded.

[whiteonyx]

Why not buy this 912 on ebay and do an engine swap?
http://www.ebay.co.uk/itm/231367880292?_trksid=p20...