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Competition success for the Transaxle continuing.

333pg333

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On the back of Mark K's recent success I felt buoyed enough to post some more recent success for the 944 turbo Down Under.

In our local Porsche Club (Porsche Club of New South Wales) we have two formats for competition. Motorkhana which I'm sure most of you are aware of as it's still popular in the UK. (In and out of cones laid out in patterns for those that are unfamiliar) and we have the track sprint events. (ie fastest time within your class gains max points). There are individual championships for those two formats and a combined overall club championship for the best placed in both disciplines over the season.

My friend Sean Buchanan in his 1986 951 road car (with added 3Lt turbo 16v goodness) won every round of the Motorkhana and claimed max points available for that competition. Considering that in this type of competition the cones / Witches hats are very tightly arranged and he seldom gets out of 1st gear plus he has no ABS, PASM, PSM etc and of course a 'laggier' motor compared to modern n/a cars...this is a great achievement. Also to note his car isn't a stripped out CS type car. I believe it weighs somewhere around the 1400kg region and he drives it daily. It has full leather interior, air con, music, harness bar, bigger wheels & tyres etc...ie, heavy.

Sean also won his class in the Sprint title last weekend and this meant he won the overall Club Championships (again) for 2014. Here's a little vision from the 1st warmup session. We were running in the annual PCNSW vs BMWNSW grudgematch so you'll see a few different cars in the pack. The Evo would have been running as an associate of one of the clubs. Most of the other cars in this video are running on full slicks where Sean is on Hankook Z221 R specs.

https://www.youtube.com/watch?v=R811_2Zl3gU&feature=em-uploademail

This season I ran my car in a dual driver capacity. That is I drove but so did my builder Paul McKinnon. Paul is a great driver and has tasted success on the track many times previously. We entered 5 Sprint events this season and Paul won every one (breaking all of the track records) and we now have the fastest Porsche that has ever been in the club (which has been running for many decades). To note, we have been up against many GT3's, Cup Cars, 962 copy and even a highly modified 996 RSR with 4Ltr engine, Motorsport ABS, full Sequential tranmission (now with pnumatic paddles) and of course they're all on slicks while we're on Yokohama AO50 R specs.

We had our last round for the season on Saturday. Bright and sunny at Sydney Motorsport Park Grand Prix layout. (Same layout as we'll be on for World Time Attack Challenge in 3 weeks.) We had some new front Aero that we were very keen to try and expected big things from. We still ran on old tyres, one set from October last year and we also ran into a boost leak which kept power down quite a bit. Alarmingly I also came into the pits to find that the rear left tyre was only showing 11psi hot!! Confirming the squidgy rear I was feeling! So we swapped to the year old tyres and Paul went out and beat the benchmark time of 1:38.8 by doing a 1:32.2 which opened a few eyes up! The RSR managed a 1:35.6 and the fastest BMW was a road going E30 M3 that did a 1:40.3 Wolf in sheeps clothing with a Sequential gearbox in that road registered car. Sounded great. Was very surprised that some of the BMW full racecars didn't do better. Not sure what was wrong there but they had several fully caged cars turn up on trailers that promised much. I think their previous best car has done a 1:35 or .36 from memory.

Anyway, we got quite a lot of people coming past our garage to check out this black interloper. Was a fun day except for the glitches. Here's some video from our car. The first one is me with the flat rear tyre. I'm being pretty careful, especially with WTAC around the corner. The second lap is Paul on the old tyres having a bit of fun just trying to find the limits of the car for reference. On the 3rd video he was also compromised by the fact that they're a 30 series aspect ratio where we've set the car up for the 35 a/r tyres. So he was hitting the rev limiter quite a few times through that lap which was done in the heat of the day (ie slower track). The great thing to take away from the weekend was how much the new Aero really felt amazing! The car just sucked down through the notorious Turn 1. Our new minimum speed through that 90o turn which is at the end of the longest straight is now 215kmh and we know we have more in the car. Just a matter of confidence, but there was no point trying to win W.T.A.C. 3 weeks early.

Me: https://vimeo.com/106715445

Paul: https://vimeo.com/106713105

Paul: https://vimeo.com/106724399

I'd also add that video never shows the undulation, bumps, camber, turns and elevation very accurately.


So the 3 competition titles have been taken by two (slightly modified [8|] ) 1986 944 turbos which has never been done before. Next year we will be up against the record times we've set this year so it will be a lot more difficult to back this up. We are considering running slicks next year just to give us a fighting chance. I know the guy with the RSR is attempting to even up the playing field too. Plus there will be a few more interesting cars in the mix so I'm told.




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Very impressive Pat......nice to see proof of what some on this forum already know...'.if you want a fast car either standard or modified you'll be very hard pressed to find something better than a 951'.

top drive sir....:)

Pete
 
Your car is epic Patrick!!!,will be watching those clips this weekend!!!
Nice 944T competed in the 40 min AFF race at weekend at Brands,its large displacement,owned by Dave B,he races in the championship in a 964 aswell!!!!
 
Thanks guys. It's been a fun season to date. 5 out of 5 wins in the PCNSW events plus the Sprint title. NSW Time Attack Open class winner and also 2nd outright by 3 hundredths to a Pro Class Evo. Now the big event for us in 3 weeks. World Time Attack Challenge. http://www.worldtimeattack.com/ It is mooted that there will be a live stream so if you so wish you might be able to catch a little of the event. We are sort of unofficial favourites in Open class but are up against some pretty formidable opposition. All wheel drive Nissans and Evos with Sequential transmissions and a lot more horsepower than us. As you can imagine, our only hope is in the corners and under brakes. The natural balance of the 944 chassis still comes to bear after all these years. While our car is clearly highly modified, it's hard to compare to SQ trans, ABS, twin overhead cam, twin arm suspension and 35psi + that some of these cars run. The All Wheel drive is like cheating compared to rwd but somehow we are in the mix. The other advantage we have is that we've undergone some significant Aero improvements and these are really starting to bear fruit. We have a few more changes to make and hopefully we can do the 944 fraternity proud and bring home the bacon! [:D]

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Thanks Paul...and we do need luck on our side too. [:)]

Main competition is seen to be this car driven by last year's winner in Open class who was driving something similar.
We think circa 800hp, all wheel drive Nissan GTR34 with the latest Albins Sequential gearbox (same as the Aussie Supercar V8s run with) and a host of other 'nice stuff'!

https://vimeo.com/100976426

As you can see....no slouch!!! [:mad:]
 
Likewise, the Empire really does strike back by having engines that aren't made of chocolate like the modern cars for a start. There is just no way I would consider taking any of the non-Mezger engined cars on track.
 
To be fair, we've modified this motor a lot from a stock motor. Plus the stock i4 Porsche motor is sometimes referred to as a Tractor engine by the same guy that built mine. [&:]

The latest few things we've done to it is make a new custom intake to replace the stock one. That helped on the dyno quite significantly in terms of power gained. Also we were going through headgaskets virtually every time we went to the track. So we've O Ring'd the block, or actually sleeves, and had some brass rings made up to go with a copper head gasket. So far so good! I guess while I'm here I may as well say that we moved the power steering pump inside the car and also built a very custom front sway bar to relocated behind the front axle. We also removed the large (and very efficient) air to oil cooler and changed it to a smaller water to oil heat exchanger. These three changes were so we could make room to build a proper diffuser in the front splitter. After driving the car last weekend I can say that it was all worth it judging by the feeling of stability it creates now. Oh and we also replaced the front brakes to a set of Alcon 6 piston monoblock over some 375mm Coleman Racing vented floating rotors and hats. Very solid underfoot now. (Compared to previous Big Reds)
Lastly, I believe we're the only car with factory numbers showing 952.

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Can you get Wills rings in the correct bore size?

A bit late now the block has been machined, though...
 
There is some real deep development in that car Patrick, amazing, but the TOW label on the back panel is from our side of the globe, and you need to rotate it 180 deg [;)]

The front ARB is below the chassis legs...? reminds me of the early 911 which went through the luggage area, but will be 10 times more rigid than the std setup.

The brakes look massive, maybe not any heavier than the previous big red setup?

The Wills rings Simon mentions are I think the correct name for the Brass Rings, they were used in the UK for the 3.2 engines I think, but maybe in Bronze?

I see an inlet manifold on the CAD screen here recently.....

Hope the WTAC goes well for you

George
944t
 
Wills rings are hollow and filled with inert gas. From memory nitrogen. They were originally called Cooper rings.

http://en.wikipedia.org/wiki/Wills_Ring
 
Thanks Gents.

Too late for those Wills rings. I did consider a headgasket that Cometic make that has something similar. Phuzion or something comes to mind? However we have had the car up to 1.7bar on the dyno and done 3 trackdays since and haven't used a drop of coolant so that's fantastic compared to previously this year. It was a drag having to do a new gasket after each event!

You're right George, the brakes are bigger but no heavier. In fact we removed the stock rear rotors and replaced them with floating ones and also removed the stock brake hardlines on the rear. So overall we've actually reduced our braking weight a little. The stopping power is now pretty impressive. Note that we don't have any of the old OEM m/c and booster anymore though. Running PFC pads at the moment. Love the feeling of coming into a hairpin with 200+ kmh on the clock and just being able to stomp onto the middle pedal to bring the car down slow enough to make the next turn. Very satisfying. [:)]

The inlet manifold was just made in the shop and no huge amount of science went into it. Just common sense and space. By just changing the intake we made definite gains as you can see. At 20psi it's about 30whp and at 25psi it's about 50whp on same dyno under similar conditions. We also tuned it so there is now throttle based boost ramp. More progressive or forgiving to drive. We might just tune it for WTAC to allow circa 28psi on the straights if we're ahead of previous best times. Could be the difference between 1st and 2nd place if I'm not being too presumptious. [8D]

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Saw someone else's thread resurgence and it inspired me to do the same. Last post was a few weeks prior to the big Time Attack competition in Oct 2014 down here and looking back at those last posts I can remember the quiet feeling of confidence in our camp.

We got there on the first morning of the 2 day event with a real hope of taking out the Open class. However the Gods of Motorsport frowned upon us and we managed a grand total of 2 laps for the weekend! First thing that went wrong was the brand new tyres which I thought I had been clever and had them shaved and heat treated. As it turned out the Tyre shop's machine couldn't cope with the 295 tyres and managed to make them out of round. They tried re balancing them with 120 grams on one wheel so clearly there was something wrong. Then one of the rear CV's failed. I had a second hand spare one which went in but it didn't matter as the next time out the pulley wheel that the dry sump belt is on sheared in half. Paul (builder) raced back to his shop and machined a complete new one out of a block of Alu and we put it on with high hopes that our issues were behind us. However we then discovered that there was a crack in the inlet manifold so Paul found a welder and zipped it up. Now, we hoped we'd be finally able to turn a proper lap. Next time down the main straight and into T1 and the main timing pulley sheared in half similarly to the dry sump pulley...and that was all she wrote. Incredibly frustrating and even now writing this down brings that empty feeling back having put so much time and effort into the car leading up to last October. As it happened, we were still sitting in 3rd place after the whole weekend and we thought it would be ironic that we make the podium under these circumstances. The last session of the event gives cars one last crack with a flying lap and someone managed to beat us by 6 / 100's of a second and promptly had to park his car on the track having 'boosted' the engine beyond breaking point. So I guess we were fated to just fail...again.

After the dust (and tears) had settled we tore down the motor and found that it had essentially shaken itself apart. There was damage to the rods, pistons, bores, girdle and crank. In the end we determined that the heavily knife edged crank was the cause and had created some horrible harmonics due to crank whip. Hence the parts breaking off the crank nose.

So then I had to decide what to do with the car. After a serious re-think I started to consider finishing the 16v motor and had some fairly deep discussions about what our target was for the new motor. It became fairly ambitious (850bhp @ 9000max) and is now back on hold. In the meantime the builder/supplier had a few spare parts that he was willing to supply to get us up and running sooner rather than later with an interim motor. So we are just finishing up on this unique little 2.5ltr 8v motor. The pistons are custom 102mm CP with a smaller wrist pin located higher in the piston. They're quite light and have been made to go with the custom longer Carillo rods. The idea is that we wanted to reduce the wider ellipse via the stock piston / rod design. Less wear and much kinder in terms of Harmonics. The static compression ratio is just over 9:1 which is higher than I've seen on an 8v motor. The head has massive ports (way bigger than I've seen anywhere else) and a very high lift cam (.595 in / .526 ex) with solid lifters. The target on this motor is at least 600bhp / 8000rpm max. It has the deckplate, large 9/16" Arp headstuds, doweled girdle to enhance the structural rigidity. We're also running a much less lightened crankshaft and a dampener on the nose to assist with harmonics. We're just finishing off the assembly of this and back into the car. Then we'll make up another intake to suit. Pic showing new flange. Note the side of the head has been decked to make it totally flat. The ports are so big that there was very little material to make a seal.
Should be on the dyno within 2 weeks. Really looking forward to seeing what this little motor produces. It will be very different from the previous 3.1 8v for sure!

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