Ruf Stuff
From time to time, I put aside the theoretical end of business and go out and live it first hand.
This is a brief revue of a very interesting new car from one of the world’s great car makers, Ruf Automobile - http://www.ruf-automobile.de/. For those who don’t know about Ruf, all I need say is Alois Ruf builds Porsches the Porsche would like to build them.
My friend Jon M was in town, so a visit to Alois and Estonia Ruf seemed a great way to spend the day, you can only take so much Oktoberfest.
As luck would have it, it was one of the nastiest days of the year, weatherwise and I had mentally written off doing any testing. I was a little concerned as Jon was heading up to the ‘Ring afterwards for an appointment on track with his ‘disposable ring toy’ which is kept up there.
In any event, we were made welcome by Alois on our arrival and after explaining that Jon had quite an ‘interesting’ 930 we were handed over to Marc Bongers (http://www.amazon.ca/Porsche-Data-Book-S
This isn’t your normal Roots type Supercharger. It’s more like the cold side of a turbocharger. In this case it is beautifully done with integrated intercoolers and driven by a polyrip belt off the crankshaft. A centrifugal clutch disengages it below 1,500 rpm. It all wraps most neatly round the engine. Allegedly, it is extremely efficient and keeps on building power right up to the cut-out. My ears really pricked up when we were told that it has been fitted to the Cayman. I tucked that little item away in the memory bank and continued admiring yet another lovely flip flop paint job and some glorious restoration work.
Still raining we went down the road to join Alois and Estonia with their Latin American friends for lunch. As per usual I banged on about cars for far too long in front of people who really know what they are (not) talking about, they were far too polite to tell me to stow it and, I think in an attempt to get me to put a sock in it, I was asked if I would like to drive the Cayman with the Supercharger. A blur later and I was back at the garage waiting for ‘my’ Cayman.
I was warned that it didn’t have the aerokit fitted, so the downforces would be a bit light but was otherwise complete. The front aerokit will include a bigger splitter and a 997 GT3 appearance whilst at the rear, the spoiler will be larger and the appearance generally tidied up. The suspension had been lowered as well and the car had an aggressive appearance.
At this stage I have to admit that I haven’t driven a factory specification Cayman, so I can’t compare it directly. In fact, of the recent ex-factory cars the only ones I have driven are the 996 and 997 GT3 Cup, the 996 GT3 RS, and the 996 and 997 Turbos. So that’s my frame of reference.
The car started quite normally with no drama but a slight and rather pleasant edge to the exhaust thanks to a nice piece of fabrication to build a rather more free breathing exhaust system with metal catalysators. The engine pulled away cleanly as we headed down a fairly agricultural road, engine note growing as the revs piled on, no quitting with this supercharger, the engine just gets ever more urgent as revs mount, the power delivery becomes more rapid all the way up to the limiter, it feels like a very well sorted engine about a litre bigger than the Cayman’s transplanted 3.8 litre engine. I was impressed by the rate at which it builds speed, the responsiveness and the ease with which the car handles a huge hike in horsepower. For now lets just call it a ‘huge’ hike, I don’t believe its only the 440 horsepower claimed, it feels far stronger, in fact I’m on the same schedule as I am in the 997 Turbo, so that gives you an idea of just how much more this conversion gives. As I got into the car I noticed up-rated brakes and now I tested them before I need them in anger, nice linear feel with no perceptible lag before engaging, obviously they are doing a good job of coping with wet rotors.
From behind the wheel everything feels tight, the MPS2 shod wheels, not my favourite tyres if I am honest, feel solid on the road although I wouldn’t exactly describe them or the steering as talkative, we felt planted, the rear end was solid, tracking in line and not perceptibly moving around. As I began to up the work rate, the lack of aero began to assert itself so that running through corners at over 100 mph, I needed to ‘nig’ the front several times to get the tyres to bite and counteract the understeer, however at no stage did the car feel unstable doing this. The technique just felt entirely natural and appropriate for this car and much more appropriate for the chassis dynamics than suddenly backing off the throttle to kill the understeer.
Even in the rain and with variable visibility, overtaking was a breeze, the speed piling on and turning planned two car passes into whole queue manoeuvres. This car really does go down the road like a rat in a sewer. I’m impressed, the speed and handling are better than the Turbo and GT3 in the real world, although I am now feeling that it’s a bit tricky as the limit approaches, the low polar inertia will lead to the rear end coming round a bit suddenish, if you get my drift, it may not be as kind to novices as the GT3, but the whole time I’m thinking ‘what a great track tool’! And this one doesn’t yet have a LSD fitted. The options here are interesting and I look forward to trying one of Stasis Engineering’s modified units.
Hey, I want one of these, really I do, this is a real sports car, yet comfortable enough to spend the day in crossing continents. After too short a drive I stop and hand over to Jon over his protests, he too enormously enjoys his drive back. On our return I report how great we found the car and clarified a few points. Yes, the quoted 440 horsepower is extremely conservative, yes there are more options available.
What everybody thought is borne out in reality, the Cayman has a better chassis from a performance point of view than the 911. One of the problems as far as racing is concerned is that fitting a roll cage is less than straight forward. In retrospect this car impressed me as much as the 997 Turbo under whelmed me. I love this car, it handles like a dream and I’ll offer time and distance across country to GT3 and Turbo pilots with one of these to hand, run don’t walk to join the queue for one, its that good. To illustrate how different this supercharger is, I mentioned to Alois that I felt that the rev limiter should be softened, he looked surprised and said this was standard, so I pointed out that with the power growing ever more rapidly as the revs build you bounce that much harder when you do hit the limiter, but I only did it once, it was so sudden.
This car has joined a very select list of driving tools which have earned my five thumbs up accolade, amongst which are the 2006 Gallardo, this is rarefied company indeed.
For the more technically inclined, I’ve dug up some background on the supercharger. It has been developed by ASA under the guidance of CEO Christian Stöber and is described by them as a mechanically driven radial compressor. Yes, you may have seen versions fitted to Alpinas. Close examination reveals a jewel-like piece of engineering with beautifully executed twin intercoolers and revised inlet manifolds. Additional cooling requirements are taken care of by a third front mounted radiator and the supercharger’s oil supply is kept separate from that of the engine itself. The key to a long and reliable operating life is perfect balance. To this end, ASA does as much work in house as possible.
This supercharger technology certainly blurs the line between normal and forced induction as far as the driving experience goes, and a little (yellow) bird tells me that we are going to see a lot more of this technology.




