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Röhrl-approved tyres for classic Porsche sports cars

Röhrl-approved tyres for classic Porsche sports cars

Porsche has just added a bunch of new N-rated tyres to its list of approved rubber for older Porsche sports cars. The fact that Stuttgart’s release considers anything pre-2005 as classic is something we’ll gloss over for now – not going there on a Friday afternoon.

Porsche N-rated Tyres on Classic 911s

The Porsche tyre N-rating system is a subject of much discussion amongst classic 911 owners: probably in the top three conversation starters along with “what oil should I use?” and “I once turned down a 964RS for £20 and a half-eaten steak and kidney pie.” Not fitting N-rated tyres to your old Porsche won’t make it fail the MOT or invalidate your insurance, but there may be some comfort in fitting tyres which Porsche has tested on your classic. It also leaves you with plenty of headspace to worry about the engine going bang or whatever people worry about these days.

Classic Porsche tyres N-rated 1

Pirelli, Continental, Michelin and Bridgestone all have rubber on the latest classic Porsche N-rated tyre list. As impact bumper 911s are closest to my heart, it’s nice to see that Continental Sport Contact tyres continue to be available in 205/55 and 245/45 ZR16 for 7- and 9-inch Fuchs wheels as fitted to my Carrera 3.0 (albeit the Sport Contacts on my car at present are not N rated). For those who follow a Porsche-approved lifestyle, 959 owners are stuck with Bridgestone RE71s (plenty noisy at 80dB), 964RS drivers have a better choice of Sport Contacts, Michelin Pilot Sport 2, Pirelli P Zero Rosso or Trofeo R compounds, while 924 Turbo drivers have the Sport Contact, Pilot Exalto 2 or P Zero Rosso to choose from.

Porsche Tyre Test Drivers

Porsche invited Walter Röhrl along to help with approvals, the former World Rally champion offering input based on a long history of driving classic Porsche models. Many of the current works drivers also have a classic 911 tucked away somewhere – would be interesting to see one of them drifting a pre-’73, abusing a set of N-rated tyres (Pirelli CN36 or P6000 if you must have the N). It is also interesting to see Walter leaning on a pair of P7Rs (sexiest tread pattern ever IMO) but those tyres are not on the Porsche approved list as far as I can see: P7 Cinturatos yes, but not P7Rs.

Classic Porsche tyres N-rated 2

“The driving properties in the early years were not as full or balanced as they are today,” says Walter. “The new generation of tyres is more fitting than ever to the driving style of a challenging sports car.” Porsche tyre tester, Dieter Röscheisen, said of the newly-approved tyres: “The new tyre releases will make it possible for classic models to follow the curve into the modern era with exceptionally good and balanced driving properties.” (I imagine it is more likely that a PR person said this. My hope is that Dieter was overexcited after spending an afternoon shredding 993 RS rear tyres and couldn’t elucidate.)

Classic Porsche tyres N-rated 4

I don’t have N-rated tyres fitted to any of my five old Porsches. It doesn’t bother me in the slightest, as my cars are eternal works-in-progress and only one of the Porsches is currently road legal (a classic 2004 SUV model). I have a set of part-worn 205/55 16 Bridgestones for the 924 Turbo, which will be next to go on the road. I like Sport Contacts on the 911, but tend to lean toward Michelins as my overall tyre brand of choice: they drive so well, right down to the wear bars. All that will go out the window if you can now get P7Rs to fit the 911, as they are soooo s-e-x-y.

Track day fans on my 911 forum at impactbumpers.com use a load of different non-N-rated tyres on long road trips and pretty intense driving conditions and no big problems reported there. Bridgestone S-02s have long been a good choice for spirited ’74-’89 911 driving if you can get a set to suit: you can still buy 205/55 and 225/50 16s in Porsche N3 rating from places like Camskill, but I don’t think 245s are easily available.

Testing with an original Brumos Porsche 911 RSR

Testing with an original Brumos Porsche 911 RSR

Opened my emails yesterday morning to find a late-night message from the Yorkshire Bullet: Mark Bates from EB Motorsport. “Testing at Silverstone with Tuthills tomorrow, come over for a catch up if you’re free.” Five minutes later, I had thrown on a Tuthill top and was in the Cayenne, en route to Silverstone.

After eleven sunny Northamptonshire miles, I arrived at the circuit and found the garage but no sign of Tuthills. Instead, Mark was there with top man Neil Bainbridge from BS Motorsport and a smart RSR in Brumos colours. Tuthills had asked Mark to come down and test drive the RSR with the owner (who also owns a few Tuthill-built cars), trying the setup and suggesting some tweaks ahead of the car’s first outing this year for the CER race at Spa Francorchamps.

Brumos Porsche 911 RSR Ferdinand Magazine 1

After many race miles in the two EB 3-litre racecars and the super 1965 911 that did so well at Goodwood last year, Mark is an excellent 911 test driver and has previously set up a number of non-EB 911 race cars, for circuits in the UK and Europe. He jumped at the chance to try an original RSR, making a five-hour round trip to have a go. The great weather was a real bonus.

Having already made a few misguided assumptions that morning, why hold back and break the habit of a lifetime, so I shot straight into another one, assuming this was the replica Brumos car built by Tuthills a few years ago, now fitted with BS Motorsport 3-litre power. Asking the owner about the new engine’s recipe, he smiled and put me straight. “This is the RSR that won the 1973 Mexico 1000 kms.”

Brumos Porsche 911 RSR Ferdinand Magazine 2

Brumos Porsche 911 RSR 911 360 0865

Chassis number 911 360 0865 was delivered to Peter Gregg at Brumos in April 1973 (happy 43rd birthday). Fitted with the 911/72 engine – a naturally aspirated 2808cc flat six making 308 bhp at 8k rpm – the car was sold to Mexico’s Hector Rebaque, who owned it until mid 1977. In the years he had the car, Hector took three wins in Mexico City, twice on the famous 1000 kms race.

After Hector, the car went to Guatemala for a while, eventually ending up with our friends at the Blackhawk Collection, who sold it back to Europe: first living an Italian collector for twenty years, and then to another Porsche collector in Monaco, who had it restored by the now-defunct Scuderia Classica at the start of this decade. I don’t yet have the full story of how the current owner came to possess it, but watch this space.

The track day was organised by my next-village neighbours at Goldtrack, who run a tight ship and bring in some very nice cars as a result. Parked up amongst the latest supercars and plenty of race machinery, this air-cooled classic Porsche turned few heads beyond the cognoscenti, until Bates turned the key and got the engine started.

Brumos Porsche 911 RSR Ferdinand Magazine 3

Porsche 911 Track Day Noise

Even with tailpipe extensions, intended to mute the exhaust a touch for track day dB meters, this Porsche has a proper bark on startup. The engine has a tight, pursed tickover that is so much sweeter than the all-bass soundtracks of later Porsches sporting exhaust systems apparently designed originally for industrial chimneys. I feel an audiophile comparison of most attractive tickovers coming on.

Rolling out into the pitlane, the roofline of the tall RSR runs well above the massed Radicals, Ginettas and Scuderia Ferraris that dominate Silverstone’s start-of-race-season track days. But with 300 bhp pushing less than 1000 kilos along, it goes down the road rather nicely.

“I’ve already spun it once,” Bates confesses. “Fourth lap, pushed a bit too hard and the back just came around. It’s not what our car would have done.” I asked him what else felt different to his own 3.0 RSR build, which has proved so successful in historic racing in the seven years he’s been racing it, winning back-to-back Masters Historic titles and last year’s Nürburgring Trophy race (rumour has it that Germany’s cancelled the race now the English have won it).

Brumos Porsche 911 RSR Ferdinand Magazine 5

Porsche 911 RSR 2.8 vs 3.0-litre

“They are quite different cars. Ours feels sharper after so many years of development. It’s lighter – closer to 920 kilos than the 970 or so of this one – so our brakes bite harder and suspension has a bit less to do. It’s not quite surgical in its precision, as no air-cooled car could ever be surgically precise, but our car is very sharp and reactive to drive. This one feels authentic to the period: very 1970s.”

Testing went well, with the RSR showing a clean pair of heels to most modern machinery. It flew past me on the old pit straight, holding its own against a featherweight Radical and shrugging off modern 991 GT3 RS and new BMW M3s. The delight in seeing real RSRs used with such glorious abandon – the owner encouraging Mark to thrash it and see what it is utimately capable of – was a joyous experience. Ultimately, it was left to Mark to decide how hard he drove it.

Testing at Silverstone with @eb33racing in an original 2.8 RSR #brumos #porsche911 #cultofporsche

A video posted by The Cult of Porsche (@cultofporsche) on

“It’s not my car and we’ve already been ticked off for noise and told to keep it under 7k rpm, but there’s enough going on to see what could be looked at. Our car runs lower gear ratios, which offer more opportunies to exploit the engine’s torque. We have some suspension tweaks specific to our car and this year we also have our own dyno-developed exhaust system coming. That makes a difference to the power on tap.”

“It’s been a good morning and we’ve learned quite a bit, changing tyre pressures and moving some ballast around,” said Neil, who has extensive personal experience of racing 2.8 and 3.0-litre RSRs. When I suggested that he may have been one of the last people to race a proper 2.8 RSR around Silverstone in period (not including club races and historics since then), he had a think before sharing a great story of racing a non-turbo RSR against an Autofarm 934 back in the day. But that’s a tale for another time.

Porsche 924 Turbo Restoration Latest

Porsche 924 Turbo Restoration Latest

My 1980 Porsche 924 Turbo restoration has made great progress since I reset my work schedule and committed to spending the weekends working on my own projects rather than sitting behind a laptop. My bank account is slightly less happy about the restoration, but payback will come in due course.

I’ve now clocked up a couple of hundred hours on this car, and poked around most of it. While there is unsurprising evidence of parking dents and other traumas from its former life in Italy, underneath all that it’s a really great example, especially now I have reconditioned most of the moving parts fixed to the bodywork. Dropping all the mechanicals to do a full restoration is very tempting, but I must resist.

Porsche 924 Turbo Restoration Ferdinand Magazine 1

Retaining Porsche Patina in Detailed Restoration

Perhaps the most engaging part of the rebuild after the 924 Turbo’s bodywork was so nicely stripped, prepared and repainted by my old friend Rob Campbell at Racing Restorations has been deciding what to keep and what to ditch, in hope of retaining some patina and original character to compliment the delightful new paint.

For example, none of the locks matched, so I junked all of them, pulled the smoothest ignition barrel out of my stash of 924 & 944 parts and then bought a full set of VW tumblers and rebuilt and rekeyed every lock on the car to match. This led to stripping the latch mechanisms and locks, new door seals, new hatch seals – you know how it goes.

The dash was a mass of old alarm wiring and leftover radio installations so all that got junked. The black speedo trim ring was rusty for whatever reason, so I tossed that and stripped another speedo to find one in better condition. That led to stripping all the clocks and cleaning the dials and glass faces so they all look great now.

Porsche 924 Turbo Restoration Ferdinand Magazine 4

Porsche 924 Turbo Strip & Rebuild

Everywhere I look on the 924 Turbo now, I see bit that have been stripped and rebuilt. I stripped the electric window regulators including the motors and sorted all those out, bench testing them before refitting to the car. I haven’t done anything about the wiper motors yet but I bet it happens. Having all of the trim out of the inside meant I could clean it up properly and Dynamat quite a bit, so the doors now shut with that satisfying clunk and none of the rattles that used to soundtrack entry and exit.

Having junked so much stuff, I also found a few bits I wanted to keep. The Italian plates are back on the car, just because I love them. I riveted the rear plate together, which is not strictly correct but it means bits of it can’t get stolen! I tossed the LED-infested centre console gauge surround and bought another mint one in black, but kept the slightly crappy cigarette lighter from my old one, as a well-used cigarette lighter in an 1980s Porsche is just so Italian, darling.

Porsche 924 Turbo Restoration Ferdinand Magazine 5

I fitted a replacement glass hatch with a good condition spoiler (the original was utterly ruined) and polished all the original glass, refitting it in a mix of new and good used seals. I liked the Italian anti-theft alarm window sticker so I kept that. Under the driver’s seat carpet, I found a 200 Lira coin from 1978, so that is now the keyring. I kept the original dog-leg gearlever but replaced the shift boot and sent the ratty steering wheel off to be restitched – I hope they can retain the original leather. I have a nice three-spoke for the car if not. I ordered a full gear linkage rebuild kit from AutoAtlanta in the US, but that has not yet arrived.

Porsche 924 Turbo Restoration Ferdinand Magazine 9

I fitted new rear speakers (long story) and decided not to cut the original front door panels to fit another pair of speakers – the rather spartan black vinyl has survived this long without cutting and deserves to be left alone. I stuck a centre speaker back in the dash to add some noise up front. I decided not to change the cracked dash: you can get new ones but 924 owners are generally well used to cracked dashboards. The original rear view mirror is a non-dipping version and I’m slightly on the fence about keeping or saving. I have a pair of dipping ones with the glass mounts in my stash so I may change that.

Porsche 924 Turbo Restoration Ferdinand Magazine 6

Original seat belts are in good condition so still in place: they were likely never used in Sardinia! The car is quite low mileage anyway, so they are fine. Refitted the original roof aerial as, while it is not the shiniest thing ever, it is perfect for the 924. I fitted a new rubber trim to the rear bumper (just squeezed into the Polo in the massive tube it ships in from Porsche) and new seals on the door mirror, door handles and boot lock.

polo

I rebuilt the front bumper light clusters: you’d be surprised how long that took. One indicator reflector was completely rusted out so I stripped the reflector off another one and plastic welded it back together (the fun of playing with £5 parts). I cleaned and refitted the Italian side repeaters as, while they are not very attractive, they are original to the car. Stripped the window switches, sorted them out. All very satisfying. I have been keeping things as tidy as possible, but you’ll see from the photos that it needs a lot of cleaning when it is eventually back together: I am quite looking forward to that.

Porsche 924 Turbo Restoration Ferdinand Magazine 11

Classic Porsche Build Quality in spades

So many hours later, with many more left to invest, I continue to have great respect for classic Porsche build quality with the 924. The way it’s built is inspiring to work on when you’re not in a rush; so much intricate detail signposts the hours of highly skilled labour it must have taken to build each one. The assembly is very like my old E28 BMWs and Mk 2 Golf GTis: plated screws and high quality metal clips everywhere. It is time consuming to make things better – stripping the fusebox and wiring out to clean up the corroded earth points behind for example – but once done, you get the feeling it will last forever.

I feel sure I will buy another 924 to work on once this one is sold and I have cleared out a few more cars. The Signal Green 1977 924 we saw at Essen a few years ago is still very strong in my memory – that’s the sort of old-school 924 I would like to do some miles in if Turbo prices have soared out of reach. Small but modern 1.4 engine transplant, little Turbo, careful gearbox build, classic trim.

People are still building Porsche Hot Rods

People are still building Porsche Hot Rods

The average week puts me in touch with a stack of people seeking 911 projects. “I want a cheap SC/3.2/964, let me know if you come across anything.” A quick email to enquire about their plans usually leaves me depressed, as the Porsche hot rod has mainstreamed to Magnus and Singer, with most other builders going back to factory spec. Singer is by far the biggest influence nowadays.

Porsche 911 hot rod 3

There is nothing wrong with factory spec if that’s your bag and you do it properly, cutting no corners: a crisp early 911 is a very beautiful machine. But the idea that owners of SCs and 3.2s (and 964s and 993s) have suddenly been appointed as rolling museum curators just because values have shot up continues to be a major pain in the arse for those of us who enjoy individuality expressed through classic Porsche. There are lots of these cars in the world and plenty of nice original examples. Bring something to the car which is all about you, other than your name on the annual service bills.

Of course there are some fine hot rods in build at Porsche specialists all around the world, but those builds could be said to be slightly diluted by the professional suggestions that inevitably infiltrate the process – specialists are not exempt from the idea of conservation and what is “period correct”. Pics received from Neil this week offered some light at the end of the tunnel: people are still building Porsche hot rods to express their vision of the essence of Porsche.

Porsche 911 hot rod 4

Neil’s car was built by Neil, in his garage and to his taste. You might do some things differently, but individual expression is the point. Based on a 911 SC, this 3-litre has the Jenvey throttle bodies we would all like to fit to junk the ageing K-Jet intake. Neil has added DTA engine management and a straight through exhaust (I presume this is headers) into a custom silencer. The car makes 236 bhp, so there is a good chunk of budget gone, but a lot of fun added and a big leap in throttle response and fuel economy.

Porsche 911 hot rod 5

With more power on tap, the obvious next step was to take weight off and Neil found the answer in the EB Motorsport catalogue. Lightweight front wings and bonnet, much lighter bumpers and the rear quarter panels and engine lid have taken at least 100 kilos off the car. The diet continued with polycarbonate windows and lightened doors. The engine was treated to GRP tinware on the lighter engine (losing that winding exhaust junks a lot of heavy scrap too).

Porsche 911 hot rod 2

Neil hasn’t told me what his car weighs, but given the parts used, I am confident it’s less than 1,000 kilos. I’m sure it makes a great noise and he has plenty of tyre options with those 17″ Fuchs-style wheels. Of course you would do it differently, but instead of telling us all how you would go if you were building a hot rod, send us the proof that you’ve done it. Curators don’t get a say in the hot rod world.

Porsche 964 RS EXE-TC Damper Upgrade

Porsche 964 RS EXE-TC Damper Upgrade

Watched a cool project in progress at Tuthill Porsche this morning, with my ex-BTCC tech mate Chris Defriez fitting EXE-TC dampers to a Porsche 964 RS track day machine.

EXE-TC dampers Porsche 964 RS 1

EXE-TC suspension is a high-end option for Porsche 911s that has been used to great effect on many Tuthill rally cars over the years, but decent suspension is just as important on road and race cars. EXE-TC kit is now available for most 911s from 1965 onwards. These remote reservoir 964 dampers are beautifully manufactured, featuring mega adjustable billet top mounts, which gave a wide range camber and castor adjustment at the top and bottom of the suspension leg on this particular 964 RS.

EXE-TC dampers Porsche 964 RS 3

The kit being fitted to all four corners of this RS created an interesting challenge for Chris, as he worked out where to site the remote reservoirs. Front is not too bad, as there is a handy strut brace sitting there ready to mount damper reservoirs, but the engine compartment on a 964RS is pretty packed, so not many options in the back. I’ll head back over in a few days to see what he decided.

EXE-TC dampers Porsche 964 RS 2

964RS is still the one for me – they are absolutely fantastic cars. I am another one of those who almost bought a 964RS many years ago when they were circa £30k, but decided against it. I can live with the decision but, every so often, it does niggle me that I will never actually own one of my own. Prices will never return to that sort of level.

JZM Porsche 964 RS for sale

Prices for proper Porsche 964 RS models now start circa £120k and rise to much bigger numbers for original, low mileage RHD examples, so this well used LHD track car is still worth serious money by normal standards. There are a few 964 RS models up for sale at the minute, including a 964 Cup Car for sale at just under £200k. I’m not about to remortgage my house for a 964 Cup Car, but how cool to have bought one when they could barely be given away.