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AYRTON BEHIND THE STEERING WHEEL When the editor of Vroom told me that we were going to test the new Mir rib protector, and no other than the DR OKJ chassis powered by TM at the circuit in Arce, I was so excited, just like when you are drawing closer and closer to a racing weekend. The circuit in Valle del Liri is one of my favourites, it’s where I raced for the first time and U stopped fastest lap and got pole in the 60 Baby class, but moreover Arce is Danilo Rossi’s home track, Danilo a real star, with a collection of karting championship wins, enough to be the envy of any Formula One driver. The OKJ is an ideal class for me, in 14 years I have had a chance of driving in the direct drive, the historical 100cc MRC valve and reed, but to be able to try a TM powered DR and at Arce is really the top, a great satisfaction. Added to all this there’s the fact that Mizzuddin Musyaffa Bin Abdul Gafar stopped second best time in the European Championship at Arce and Portimao on this kart, which confirms DR team’s high competition level.

APPOINTMENT AT VALLE DEL LIRI

TECHNICAL FORM CLASS

125CC OK JUNIOR

CHASSIS

DR S97

CIK HOMOLOGATION

35/CH/17

CHASSIS HEIGHT (FRONT/REAR)

STD / STD

SUPPLEMENTARY BARS

FRONT STD

TRACK

FRONT 122 CM, REAR 140 CM

CAMBER

4 MM OPEN BELOW

CASTER

NEUTRAL

TOE-IN

OPEN 4 MM

REAR AXLE

D.50, DR5, 1020 MM.

THIRD BEARING

FIXED WITHOUT GRAINS

TYRES

VEGA TYPE HX

ENGINE

TM RACING S JUNIOR

CIK HOMOLOGATION

31/M/24

RATIO

12/79

FUEL MIX.

ELF HTX 909 4%

CARBURETTOR

Ibea F3

I get to the circuit at 10:10 am and I wear the official DR pilot suit for one day: the well organised team is setting up the karts and among them there’s “my” OKJ. Besides them there’s also Bruno and Riccardo Mazzeschi in charge of the MIR Racing Line, Andrea Saccucci and Daniele Parravano from Officine in Progress. Andrea and Daniele have mounted an ‘Orion’ box and several sensors for obtaining data were put on me, sensors that will monitor body response whilst driving. The chassis and the engine were in expert hands, Marco Rossi’s. Thanks to the characteristics of Arce, it’ a great track for testing the engine: the first turn (Enzo Ferrari turn) that can be covered almost without closing gas, allows you to “evaluate chassis response racing at high speed and so do the narrow turns (ramp 1 and ramp 2) that lead to the second straight. You can see how agile the kart is on a mixed part of the track. The characteristics of the asphalt are such that early on during the day you can’t take data regarding time, but evidently on pre-racing day as there are lots of karts on the track the asphalt is better performing sooner. Obviously, carrying out the test during the week means that you have to follow the changing track conditions with the right setup. Usually we can approximately say that there’s on average one second different from when the asphalt is at its best and the track on normal days. The VEGA tyres being used are in excellent conditions, but here too, you can easily find a 2-4 tenths difference between a new set and a set that has already done one or two sessions. Marco Rossi thinks that

VROOM INTERNATIONAL MAGAZINE 85

Vroom Kart International #183 - September 2016  

In this issue: FANTASTIC 4 Marco Ardigò (Tony Kart/Vortex – KZ), Fabian Federer (CRG/Modena Engines – KZ2), Pedro Hiltbrand (CRG/Parilla –...