GT3RS 3.8 submits to 3L 16v 951.

[333pg333]

My mechanic and friend Sean Buchanan at a club trackday last Sunday with his new motor on the track for the first time. It's a turbocharged S2 motor with a Vitesse Stage V turbo V-Flex kit running on E85. The Black GT3 in front didn't sound stock either. Sounded great actually with a real race bark to the motor. Had a full cage too. That was running on big Michelin slicks while Sean had Hoosier 265 slicks on all 4 corners.
Sean's car is a daily driver with full leather interior, a/c, heater, p/s, music etc running with rubber bushings in the suspension. He has recently installed Moton 2 way clubsport suspension. He was running his car at about 1.1-1.2 bar. Pretty satisfying first time out I'd say. []

http://www.youtube.com/watch?v=HkC4n8TqkYA

 

[Diver944]

Nice footage Patrick. Sean has that thing setup nicely and obviously knows his way round the track. I love the twists and turns with some gradient change, perfect for a well balanced 944 and a nice long straight to play with all that extra grunt from the 3L 16v engine [8D]

 

[333pg333]

Actually it doesn't show up so much on video but many of the corners on that track are quite off camber which makes things just a bit more interesting Paul. As you say, there are plenty of opportunities to show the 944 chassis' strengths.
Probably the one thing that could help is abs.

 

[944Turbo]

Superb, is it an S2 originally? - its a long way round the speedo Am I correct in recalling S2's have a 160mph speedo and turbos 180 - pretty swift either way!
nice work.
Tony

 

[333pg333]

[FONT=arial"]No it's an '86 944 turbo with wide offset wheels and all rubber bushings. I keep telling him he should upgrade the bushings to more race oriented type but he likes the road comfort too. Appears best of both worlds. [FONT=arial"]The motor was out of a LHD Japanese car we bought which I used body parts after an accident and even chopped off the roof to use on my trackcar as it was sans sunroof. Sold the full interior off which was in perfect condition as well. It's got Wossner rods and 8:1 pistons. Sean said he saw 265kmh on the speedo. Allowing for about 10kmh optimism, it's still pretty fast down that straight. There's still a bit more hp to be gained as it's on one of the less aggressive timing 'images' that comes with the Vitesse software. Hopefully he'll get it onto the dyno to tune it properly.

 

[andrew_churcher]

Which track is that mate? Is it in NSW?

 

[edh]

nice 944 - I suspect the 911 driver is allergic to apexes though as he keeps well away from them []

 

[sawood12]

Maybe i'm getting old, but this is my type of car. Potent on track but with the creature comforts. The best thing about technology is that it allows us to have our cake and eat it. The GT-R proves that the old text books of how to build a sportscar are due a re-write. After all, cars are driven by human beings and humans like their comforts and the more comfortable you make us the longer and harder we can play!

 

[DivineE]

ORIGINAL: sawood12

After all, cars are driven by human beings and humans like their comforts and the more comfortable you make us the longer and harder we can play!

I would have to argue against that I'm afraid. Nothing comes for free and all those creature comforts mean more heat in the brakes, more strain on all the components and faster melted tires. My 996 was epically fast on track even with its heated seats, sat nav, bose subwoofers, cruise control, electric everything and leather.. I felt great looking at all those uncomfortable fellows sweating in their stripped out track cars.

This difference is though that the parts you need to deal with those forces are so much larger, more complicated and expensive! The brakes and clutch I've had to replace and now engine out to find an oil leak after only 2-3 hours on track has cost me 10-20 times what it would have cost on a Caterham. So much so that when the car comes back I will be putting it away and sticking to road driving from now on.

The thing about a Caterham etc is it doesn't take a lot to turn/stop 600kg, the forces are so much smaller that you can replace the same brakes, seals etc for a couple of hundred pounds. It makes abusing the car seem reasonable/justifiable.

 

[333pg333]

[FONT=arial"]It is true the guy in the GT3 does appear to keep to the middle of the track but I've seen this quite a few times from many rear engined cars on this track. Even Cup Cars. Not quite sure why, I think they avoid the ripplestrips as much as possible. Also the video doesn't show the off cambered nature of this track. There are quite a few corners where you want to turn towards the apex yet the g-forces are pushing/pulling you in the other direction. It's quite odd. [FONT=arial"]  [FONT=arial"]Oh, Andrew, the track is Sydney's Eastern Creek. Hopefully the state govt. is actually putting some $$ into it to re-develop it so that you can run 2 events on the same day on separate parts of the track amongst other upgrades.

 

[os951]

ts a long way round the speedo Am I correct in recalling S2's have a 160mph speedo and turbos 180

1986 Turbos had 160 mph speedo. 1987-91 had 180mph one

Nice video Patrick []

 

[Fat Albert]

Nice Video, what kind of power is that putting out?

 

[333pg333]

Olli, I am not sure if our speedos tend to just be approx 10kmh optimistic or does the fault increase exponentially the faster you go? Matching it against GPS I think it's more the former.

As for power levels of this motor, hard to say as it's not been on a dyno yet, but the two cars are approximately the same weight and seem to accelerate at a similar speed, I think it's safe to say that they're in the same ballpark notwithstanding all the other variables in this equation. 2010 3.8L GT3 RS has 435hp as quoted from the factory...which are notorious for publishing lower hp figures.
So I'd suggest that Sean's car is over 400bhp. The dyno we use locally tends to read very low compared to others so we're not expecting massive whp figures, but it still needs to be switched to a more aggressive map and have some finer tuning done. Hopefully in the not too distant future he'll get around to this. It will be very interesting if we can get both our cars on the track at the same time as I'm re installing my old 2.5L motor which will be well down on power compared to his, but my car will be lighter and stiffer. Should be fun at least. []

 

[Neil Haughey]

Nice vid Patrick, that car really does grip well and notably has some nice oversteer sometimes so he has the understeer well controlled.

Scott / Ben, there perhaps is a decent compromise and its one that believe me has me severely tempted if I can't get together enough cash and time each year for some proper racing. Its the Cayman S but nothing to do with the power but the extraordinary chassis. For a road car on road tyres with not such an amazing power to weight ratio the times testers have got out of that thing is really amazing. As a short example an S2 race car is good for a 1:08 around Silverstone National, ISTR one of the mags had a big test there and only 2 road cars got under 1:10, a caterham and I believe the latest GT3 something. What did standout though was that Plato punted the Cayman S round in the same test in something like 1:10.5 on standard road tyres. Amazing.

 

[333pg333]

I agree with you Neil, I think the Cayman is a great little car. Only problem is that there have been issues with the motors along the same line as Boxters and 996's. Worth doing a bit of research on this before buying.

 

[DivineE]

ORIGINAL: 333pg333

I agree with you Neil, I think the Cayman is a great little car. Only problem is that there have been issues with the motors along the same line as Boxters and 996's. Worth doing a bit of research on this before buying.

Exactly my worry. I keep hearing everywhere that it's the modern day equivilent to the old 911 for feel, lightness of controls and ballance. The only touble is it's also less practical (being a strict 2 seater), suffers nasty depreciation and has reliability problems.

Maybe one day when it reaches £5k

 

[lali]

Nice motor, but.....What was with all the weaving at the beginning?

 

[333pg333]

Warming up the tyres before first flypast the Start/Finish line to commence the timed runs. This is not a door to door race, it's a SuperSprint where you are timed and points allocated within your class that go to a Sprint championship and into the overall Club championship.
You drive with cars of similar speeds even though they may not necessarily be in your competition class.

 

[Neil Haughey]

Patrick I think that is what he meant though, its widely believed nowadays that unless one really violently weaves it thus very little to warm the tyres, really need a few hard stops and some foot to the floor out of corner action.

 

[333pg333]

True enough. I think the guy in front of the GT3 does this, but most club racers don't, or they make a half hearted wobble. Possibly helps, probably doesn't. []