Video of 993 Turbo R gauges at Willow Springs for your enjoyment.

<a href="http://209.216.20.70/993turbor.avi" target="_blank">http://209.216.20.70/993turbor.avi</a>

60-100: 3.7 sec
60-120: 6.6 sec
60-140: 10.6 sec

100 octane, about 60 degrees.

 

Bill
Great footage
Are you going slightly downhill there

 

Actually, that's a good question. I recall there might be a slight downhill from the exit of turn 9 into turn 1 as Willow Springs. Does anybody think otherwise?

 

Holy Cow!!

Bill, stop telling a fib. This was taken from the deck of an aircraft carrier, mocked up to look like Willow. You were hooked to the catapult for this video shot.

Chris

 

Actually, a few of us rented the "WillowCat". It's a catapult built into the track surface. The Viper and 360 guys didn't know we were using it.

 

hmm - the front straight at Willow seems pretty level to me - you just have a fast car. In a 993TT even uphill can feel like downhill

 

Bill,
Nice video and I notice you shift right at 7000 which is where I shift unless I have to stretch out a turn! Impressive. We both know Ruf does good work.Don't we? Although I don't spend much time on the track and have never driven Willow I would have a keen interest in comparing my factory Ruf with your conveted TT. I suspect Alois gave you the 'latest & greatest' when they did the conversion! Are you acquainted with Jim Post in San Pedro?
He too has a 993TT Ruf conversion. Maybe think about getting together at the next PCA breakfast in January? PM me for private contact info if you wish!

Cheers,
Roland
PS: my stock 993TT is off the market. I am considering doing some light Ruf mod's when the factory does my next maintainence routine!

 

Hi Guys
There is very little elevation change from turn 9 to start finish which is 2425 ft. But from start/ finish to turn one it is uphill until the balcony which is 2585 ft.

Most normally aspirated cars loose a little hp at this elevation, I'm guessing around 3-5% but not the turbos.

Bill S. I noticed your shifting at 7000 rpm, have you tested your time to distance at lower shift rpms?

 

Jim,

At higher altitude in Nevada road races the Ruf has a huge advantage over NA cars because the thin air drag losses are less and the turbo power losses are not too significant! At Wendover with elevation of 7500 ' the Ruf car was 5mph slower going uphill than a (no name) cup car that normally goes 20 mph faster than the Ruf when we both run at sea level.

 

Jim,

You make a good point about shifting at 7000 RPM. Most of the run had the RPM between 5500 and 7000. The engine makes most of its HP and TQ between 4800 and 5500. So, theoretically, the car may accelerate faster if I shift at 6500.

Ruf says that the best acceleration times are had by shifting when you hit the rev limiter (7200). However, he might say this to get the best 0-100 times because you can delay your 3rd to 4th shift until after 100 and thus avoid the shift time. For example, with a 60-100 of 3.7 sec and 0-60 of, say, 3.6 sec, 0-100 could be 7.3 seconds.

What are your thoughts on this? Do you think the car will be faster with a lower shift? I'll try this at my next opportunity...

Roland,

I couldn't agree more. I'd love to compare the two cars. I don't know Jim Post. Send me a PM with your preferences on how we can compare the cars.

 

i think shift change should still be made at the redline because the torque transfered to the wheels are not the same for every gear, in fact the maximum torque occurs at higher speed as you shift to the next gear... therefore, if you shift at lower speed hoping to stay in the power band of 4800-5500, at the very next gear, you wont be at the optimum power band...
it's something i read awhile back.. =)

 

Bill,
Go here:http://www.openroadracing.com/ and check it out! Each event includes a closed road well supervised i kilometer drag race! Also notice we have the big oval track at Las Vegas for two fifty five lap sessons! Join Team Porsche and go fast on a major Nevada highway.Closed and ll for the racers for the day! If you have the Ruf IRC you can run 180 mph. I have fuel cell,fire suppressiion system and integrated roll cage so my speed limit is 217 which I have not reached yet. Jim Post is a local with a Ruf conversion and a close friend of the Ruf family.Great guy! lets try for he first Saturday PCA breakfast and plan some fun. I am not too big on running ultra fast locally but I do hae some roads we can run near LV! You have a PM!

 

Bill S
I've experimented with several different rpm ranges for track shifting. I've found that 6500 rpm keeps me in the power band and I see the highest terminal speeds with that technique. I've also installed a shift light which helps avoid the having to look at the tach drive the car and avoid the rev limiter.

I think the natural tendancies is to rev it to red line, but turbo motors tend to be torque engines and torque is acceleration. SpectraG makes a good point, the key is keeping the rpms in the power band of whatever gear your in. I think some over run is necessaary.

Looks like we need another test day