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Old 07-28-2011, 04:32 PM   #1
LIQUIDSK8S
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Default Our Porsche 934.5 aka "The Beast"

Decided it was about time I create a thread for our Beast. It's been in development since 2008 and spent the last two years reworking the suspension setup until it was perfect. It is a original 934.5 which for those that don't know, was when in 1977 Porsche came out with the 935 and pissed off some new owners of 934's. To keep them happy, they gave them a full aero package with wider fenders etc that they could add onto the 934. In Europe they only ran the single turbo setup, but in the US they ran twin turbos and gave the 935 a run for it's money.

The car was built with our partner Willi Kauhsen in Germany. He was one of the original factory test drivers for the 917 etc, and one of the fastest men around the Ring, handed Donohue his butt there. His mechanic is a ex Porsche 917 engine builder among many of the other Porsche race engines. Were currently working on a 908 and a 917.

I won't get into engine details as we keep those things to ourselves . But when running 1bar of boost we see around 650hp, at 2bar we see 900hp+. The chassis weighs 2150lbs and is a animal haha. Our car is also widely considered to be the fastest 934.5 in the world, this view is shared within Porsches race department as well. A bunch of the Porsche race engineers actually came by to talk to us about the car and advised us to turn down the boost because "you are too #@$#%$% fast, the French wont stop complaining about you".

We just did our first race of the year at the Spa Classic. Sadly we did not finish the race due to a mistake by our first driver. Very good veteran driver (pro) who made a judgement error. We qualified 1st by over 11 seconds in damp conditions. Prior to the race there was a light rain and we felt the track would dry up (it did) so while everyone else opted for rain tires, ourselves and one RSR went with full slicks. It was a bit hairy at first but you could see he was starting to get grip. If he had waited a few more laps he would have run away, let alone everyone ended up pitting for slicks which would have put us a lap up. Stupid stupid mistake, but that's racing eh.

Anyways, here is the onboard footage of the first 3 laps and the crash. Thankfully the damage is minimal (steering rack, two wheels, brakes, and messed up fender etc). Also, we were only running 1bar for this race, so you can imagine it at 2bar eh.

UPDATES:

2013 Spa Classic Race
Pics
Pics
Pics

And now for some pics of the car's build.






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Last edited by LIQUIDSK8S; 06-13-2013 at 01:42 PM.
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Old 07-28-2011, 04:34 PM   #2
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Old 07-28-2011, 04:35 PM   #3
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Old 07-28-2011, 04:36 PM   #4
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This is the damage from the recent crash


This was after our first race with the car, which we won.


Warming it up

Last edited by LIQUIDSK8S; 07-28-2011 at 04:44 PM.
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Old 07-28-2011, 04:38 PM   #5
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WOW...Amazing vehicle you got there
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Old 07-28-2011, 04:40 PM   #6
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Is there an emoticon for a man crying tears of joy?
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Old 07-28-2011, 04:41 PM   #7
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Old 07-28-2011, 04:42 PM   #8
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I hate P-cars and I'm impressed. Yummmm.
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Old 07-28-2011, 04:45 PM   #9
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Neat car. The video was sweet as well. One question, and forgive me if this is a dumb one; why did the shifter seem to be popping out of gear or something whenever he really gave it the beans? Is it supposed to do that? I didnt hear it over rev, so Im assuming this was meant to happen?

Bummer about the crash. Ill bet the guy in the yellow car didnt feel too bad about it.
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Old 07-28-2011, 04:49 PM   #10
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Nice vid, thanks for sharing.

Yes, that thing is a Beast indeed, and a bit of a wicked and wayward beastie too...couple instances of boost kickin in when car was still turning and all of a sudden it's like "Gaaaah! we are goin' WAY too fast to be this sideways!"

Last edited by RB5 Clone; 07-28-2011 at 05:02 PM. Reason: palms finally stopped sweating
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Old 07-28-2011, 04:55 PM   #11
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Quote:
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I hate P-cars and I'm impressed. Yummmm.
well, I love P-cars and vids like this are reasons why.
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Old 07-28-2011, 04:59 PM   #12
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I would have sex with Betty White for that car. I drive an old POS Boxster and a 45 year old MGB Vintage race car on track (100hp of death). Do you do vintage races or just PCA events with it? I'd love to drive down and see it run.

Last edited by silver arrow; 07-28-2011 at 05:05 PM.
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Old 07-28-2011, 05:06 PM   #13
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Quote:
Originally Posted by silver arrow View Post
I would have sex with Betty White for that car. I drive an old POS Boxster and a 45 year old MGB Vintage race car on track. Do you do vintage races or just PCA events with it? I'd love to drive down and see it run.
For the moment we have only been doing vintage race series in Europe as the car is based in Germany. At the moment we have been invited by Porsche to drive the Rennsport event at Laguna Seca, they are flying the car over for us which is nice. We have been thinking of bringing it to other tracks in the US as well, all in due time.

Quote:
Originally Posted by Obnoxio View Post
Neat car. The video was sweet as well. One question, and forgive me if this is a dumb one; why did the shifter seem to be popping out of gear or something whenever he really gave it the beans? Is it supposed to do that? I didnt hear it over rev, so Im assuming this was meant to happen?

Bummer about the crash. Ill bet the guy in the yellow car didnt feel too bad about it.
Thanks, the shifter movement is actually due to the crazy amount of TQ we are making, it's just flexing, still in gear. Haha know I don't think he minded our mishap at all, but he didn't win either. The guy who won was a slower RSR who was telling us about how he has never won or come close to winning an event. The reason he won? He took our advice and started on slicks, kept his nose clean and was a lap up on everyone since they all had to pit when the track dried up. So congrats to that guys first win
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Old 07-28-2011, 05:17 PM   #14
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Quote:
Originally Posted by LIQUIDSK8S View Post
For the moment we have only been doing vintage race series in Europe as the car is based in Germany. At the moment we have been invited by Porsche to drive the Rennsport event at Laguna Seca, they are flying the car over for us which is nice. We have been thinking of bringing it to other tracks in the US as well, all in due time.
Let me know if you run at Sebring or Road Atlanta, I'd love to come out and see you guys run.
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Old 07-28-2011, 05:26 PM   #15
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mother of god that is awesome

that is all
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Old 07-28-2011, 05:36 PM   #16
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Beautiful car. Now about all that it needs is one of these:
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Old 07-28-2011, 05:38 PM   #17
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That build and video is sick! Awsome! Thanks for posting.
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Old 07-28-2011, 05:44 PM   #18
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im wondering if he could've stayed on the throttle a bit and kept the slide going while he counter steered. Either way he was flying and it looked like he was fighting the power that thing was making the whole way.

Also, I thought he was gonna break his wrists holding onto the steering wheel like that when he was flying backwards. my god man let go!

I was scared just watching it.
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Old 07-28-2011, 06:01 PM   #19
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Quote:
Originally Posted by SBW
im wondering if he could've stayed on the throttle a bit and kept the slide going while he counter steered. Either way he was flying and it looked like he was fighting the power that thing was making the whole way.

Also, I thought he was gonna break his wrists holding onto the steering wheel like that when he was flying backwards. my god man let go!

I was scared just watching it.
We've been thinking about that too, problem was how sudden it came out. I had the same thing happen at the same spot in a 73RS replica, I just kept my throttle constant and saved it.

What's funny is how slow he is going compared to our dry speed. Were only a few seconds off the pace of the current GT3 RSR. The car handles incredible, but the power takes it to that next level. You can see by our closing speed how much more power we have. If it weren't for the crash you would have seen how fast it really is. Next time.

Part of me wishes he had straightened the wheel once backwards to keep it on track, but we all agree it was a judgement call based on traffic behind him. Had he of straightened it he risked coming back across the track and colliding with another car which would have been far worse.

Last edited by LIQUIDSK8S; 07-28-2011 at 06:07 PM.
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Old 07-28-2011, 06:47 PM   #20
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That's a nutty amount of power relative to the other cars. The only problem is you seem rather challenged in being about to safely put down the power. I'd be curious to see testing specifically for sliding as in start tweaking the car specifically in relation to sliding situations. I'm just not sure what kinds of locations would allow such testing, an old air field perhaps. If you can manage to tame the car when it does get squirrely, you will build in a lot more freedom to be aggressive with the car. It reminds me of Element Tuning's car. They custom made a new wing for their car that specifically allows them retained downforce through a wider drift angle range. I know it's awd, but their car is incredibly stable even when tossed around, and as they commented, it has a lot of it has to do with the new wing building in that stability. With that whale tail on the back end of that Porsche, I am really quite curious what some research into aero may offer for you guys in addition to toying with suspension options specifically to allow more stable power application.
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Old 07-28-2011, 07:20 PM   #21
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Quote:
Originally Posted by Back Road Runner
That's a nutty amount of power relative to the other cars. The only problem is you seem rather challenged in being about to safely put down the power. I'd be curious to see testing specifically for sliding as in start tweaking the car specifically in relation to sliding situations. I'm just not sure what kinds of locations would allow such testing, an old air field perhaps. If you can manage to tame the car when it does get squirrely, you will build in a lot more freedom to be aggressive with the car. It reminds me of Element Tuning's car. They custom made a new wing for their car that specifically allows them retained downforce through a wider drift angle range. I know it's awd, but their car is incredibly stable even when tossed around, and as they commented, it has a lot of it has to do with the new wing building in that stability. With that whale tail on the back end of that Porsche, I am really quite curious what some research into aero may offer for you guys in addition to toying with suspension options specifically to allow more stable power application.
The car is actually extremely stable, especially considered to when testing started and it was terrifying. The reason we were having issues at this race was due to rain and the decision to run on slicks. All those other guys in the video were on rain tires which is why they were able to put the power down. When its dry, our car is stable and insane haha.

The problem is we can't do too much with aero or suspension due to the rules for historic series. When we first started the car was a evil monster trying to kill you. We tried all different spring combos and other suspension tweaks till we got it perfect. We have close contacts within Porsche that also gave us info on the old suspension setups for their cars.

When get video from a dry test you will see how solid this thing is. Even in the rain it's very predictable.
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Old 07-28-2011, 07:27 PM   #22
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Back Road Runner,
Your comments are exactly why I posted the picture I did. Pretty much all these old 934's and 935's run titanium spools in the rear end. Put an LSD in there and the whole ballegame changes.

Check out this run at VIR of one of the PWR prepped 930s and see the difference in handling and driveability. A lot of it has to do with the LSD and the fact that the rear wheels are not permanently locked together. The car in the video makes 747rwhp on Pat's in house dyno.
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Old 07-28-2011, 07:50 PM   #23
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Quote:
Originally Posted by Matt Monson
Back Road Runner,
Your comments are exactly why I posted the picture I did. Pretty much all these old 934's and 935's run titanium spools in the rear end. Put an LSD in there and the whole ballegame changes.

Check out this run at VIR of one of the PWR prepped 930s and see the difference in handling and driveability. A lot of it has to do with the LSD and the fact that the rear wheels are not permanently locked together. The car in the video makes 747rwhp on Pat's in house dyno.
Video Link: http://www.youtube.com/user/PatWilliamsRacing#p/u/18/xsr8jg9pSds
I can't say what were using, but it's good . Key thing to remember with this video is that the car is running slicks in the rain which was the cause of traction issues.

Thanks for the info though
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Old 07-28-2011, 07:54 PM   #24
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^^^Haha, 1 min into that the car came flying thru and I thought "wow where does he think he is going?". The forest apparently.


The OP's crash looked like it was going to be scary at that speed , but wasn't bad at all. Elevation change, bump at edge of track, rain, slicks = spinning Porsche
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Old 07-28-2011, 09:02 PM   #25
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Quote:
Originally Posted by Matt Monson View Post
Back Road Runner,
Your comments are exactly why I posted the picture I did. Pretty much all these old 934's and 935's run titanium spools in the rear end. Put an LSD in there and the whole ballegame changes.

Check out this run at VIR of one of the PWR prepped 930s and see the difference in handling and driveability. A lot of it has to do with the LSD and the fact that the rear wheels are not permanently locked together. The car in the video makes 747rwhp on Pat's in house dyno.
‪PatWilliamsRacing's Channel‬‏ - YouTube
He seems a little slow relative to the GT3 to be making 747whp. He's probably on a low boost setting here.
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