Words Davy Lewis Photography Jape Tiitinen
NEED FOR SPEED
has evolved into, probably, the fastest car on the streets of Finland, with a 0-62mph of 2.3secs, and over 1100hp…
Flying Finn – 1100bhp Coupe
Over 1100bhp from this #S2-engine’d
It all started back in the winter of 2010 when I bought the car,” explains owner, Henry Riihelä. “I had a 350hp Audi Ur-S4 at the time and was planning to start tuning it to the extreme. Fortunately, my friend and one of the current IMSA-Sipoo team members, decided to sell his already tuned Audi Coupe quattro to me. The Coupe suited me much better anyway because it’s much lighter.”
The engine had already been done and it’s testament to the quality of the build that it still runs the same forged internals that were fitted by the previous owner in 2010. Even more impressive when you learn that it’s currently running 1102hp and 1043Nm at 2.9bar! “That is the one reason I believe the engine is still in one piece with the same internals,” says Henry, “because I always take logs from the ECU when I drive it hard and adjust things if necessary – it’s saved me at least one catastrophic engine failure.” The Coupe began with a Holset HX40S turbo and made a very healthy 662hp and 775Nm at 2.7bar on what was then Shell V-Power 99. The spec remained for a couple of years with Henry doing about 30,000km in it.
“Then in 2012 I changed to E85 fuel and with the HX40S made 698hp and 746Nm at 2.1bar.” However, the turbo was maxed out. Even so, the car ran 100-160km/h in 2.85secs and achieved 100- 200km/h in 5.3secs. “It killed a couple of fast 911 Turbo Porsches on the street – they were sold right after that,” laughs Henry.
Next came an HX50 in 2013, which Henry admits was an error “I should have gone straight for an HX55.” Even so, with some Toyo R888s fitted to aid grip and the Tatech ECU upgraded from a 6 to a 32, the now 840hp and 860Nm Coupe did 100-200km/h in 4.6secs and 200-300km/h in 12.1secs. “It outran some fast bikes on the streets,” smiles Henry. “But the rear drive shafts started to bend, so a set of billet items were made.” Fast forward to 2014 and some CatCams were fitted, together with solid lifters, while the turbo was swapped for the more capable HX55. “It made much more power at the top end, but it made the same boost at lower rpms as the HX50, so it was all win,” says Henry.
The car made a best figure of 1019hp and 985Nm at 3.16bar, but it was driven at a less stressful 2.9bar giving around 950hp all summer. Henry continues, “The best races were against a 308whp turbo GSXR 1000 and a 303whp turbo Hayabusa. We did a couple of races from 80-300km/h – the GSXR lost and the Hayabusa runs were dead even. We were all shocked. Nobody thought that this little Audi would be that fast – including me.” That summer. Henry took the Coupe to a non-prepped drag strip where he achieved a 9.9sec quarter mile at 240km/h. “It was a very hot day and I had not tuned the car for that kind of weather (so was running a bit less power), but it was still a real 9sec street car on a non-prepped track and street tyres,” says Henry.
Also that year, the car did 0-100km/h in 3secs, 100-200km/h in 3.9secs and a standing mile event with a top speed of 337km/h (209mph) before he ran out of gears. It was here that Henry chose to upgrade to a PAR Engineering dog box and sequential shifter, which he says, “Was a big mistake.”
Sadly the season ended even before it actually started. “First #PAR-Engineering
sent the gearset six months late and in my second full pull on the street, the main shaft broke – I was pissed. So we quickly made an IMSA Sipoo main shaft with a bigger chevy spline and have had no issues with that. But the summer had already turned to autumn and the weather was cold, limiting traction.” Despite the cold weather, Henry achieved 0-100km/h in 2.3secs, which is damn impressive. He also discovered he could get all four wheels to spin at 200km/h (124mph). He went on to lay down some epic times – 100-200km/k in 5.5secs and 80-120km/h in one second dead.
This brings us to 2015, where a few other upgrades were deemed necessary. “We fitted an FHRA-spec roll-cage – the goal was that the car should still weigh the same once it was fitted – 1240kg.” This entailed saving weigh elsewhere, which included a composite tailgate with polycarbonate window (-15kg); the sunroof was removed (-16kg); excess removed from interior (-15kg); lightweight race battery fitted (-15kg). At this point a Quaiffe LSD was installed up front to aid traction, while the piston pins were changed to heavy-duty items (the old ones were starting to bend) and the exhaust manifold swapped for a larger item. The cylinder head was also ported to the max and the intake manifold was tweaked with larger valves fitted. “On the dyno, with same HX55 hybrid as last year, but less boost (2.9bar) we made 1102hp and 1043Nm.
And that pretty much brings us up to the present day. “Nothing special was done for 2016,” says Henry. “We changed to a Wavetrac LSD at the rear and by the start of the summer broke the PAREngineering 3rd gear due to the malfunction of the SQS shifter. The shifter never really worked well, so I had to change the H-pattern back.”
“My goal was always to make it the fastest car on the streets of Finland – an ultimate sleeper. I think I’ve achieved that now,” says Henry. But he’s not done, not by a long shot. “For 2017 my goals are an 8sec quarter mile and to achieve 0-300km/h in 11secs – both on a street surface, rather than prepped drag strip. I think I have achieved what I started out to do and made the fastest vehicle on the streets of Finland. I just have to get the new air shifter gearbox done – and if someone is faster I’ll have to order an HX60…”
2.2 5-cylinder, stock crankshaft (balanced, nitrided and polished), #Wiseco
pistons and piston pins, #PO-Metal
connecting rods, water jacketed cylinder block and head, #Holset-HX55
hybrid turbo, #Tial
60mm wastegate, IMSA Sipoo big exhaust and intake manifolds, 4,5in downpipe, 4in to 2x2,5in exhaust (side exit), butterfly valve to bypass mufflers when boost pressure goes over 1bar, #IMSA-Sipoo
breather/catch tank system, #Cat-Cams
camshafts with solid lifters, oversize intake valves, billet intercooler (as big as it can be), 1xVeyron fuel pump to surge tank, 2x #Bosch-044
to engine, #Bosch #Bosch-EV14
2200cc injectors, #Aeromotive
32 ECU with special features: (rolling launch control, rev limiter by gear, shift cut by gear), 034 motor mounts.
Power 1102hp and 1043Nm @ 2.9bar on E85 fuel
Transmission 01E 6-speed IMSA Sipoo/PAR-Engineering dog box, SQS sequential shifter, Quaife front LSD, Wavetrack rear LSD, PO-Metal billet flywheel, Tilton 2-plate clutch with line lock for LC, Karpiola billet drive shafts, 034 transmission mounts
Brakes D2 8 piston calipers with 330mm discs (front), #Audi-S2
coilovers with stiffer springs, Whiteline rear sway bar, aluminium subframe pushings (rest polyurethane), reinforced control arms
Wheels & Tyres 8x18 #OZ-Ultraleggera
with 225/40 Toyo R888 tyres
Interior Fully stripped with FHRA spec roll cage, Sparco racing seats, Vems wideband lambda and EGT gauges, shift light
Exterior RS2 front bumper with IMSA Sipoo front splitter, fiberglass trunk lid with polycarbonate glass, sunroof removed Tuning contacts/thanks IMSA Sipoo, Petteri Lindström and Antti Oksa, Tatu (Tatech), Check out YouTube: 4WDDR
“Nobody thought this little Audi would be so fast, including me”
“It killed a couple of fast Porsche 911s on the street”
Above: One very happy owner.
Left: Intercooler dominates the front.
Below: Cage and bucket seats.
Above: Big brakes and lightweight #OZ
Above: This monster gets used on the road.
Right: Side-exit tailpipes.