TB993tt

Guy
Even more to it than maybe meets the eye. The car was actually based on a 964 carrera 4 with a strosek/993 bodykit on it. Yes it has the RS sloped screen and matching bonnet. Schmirler told me it was the gearing which made a big difference, 5 speed meant less shifting and more time using the very broad torque curve (it had 754NM @4500rpm). It would do 221mph. Now what adds another twist to the puzzle is that the very car was advertised for sale in Sport Auto a couple of years ago:

It now claims 700PS by RS Tuning. I challenged RS about this and they insistit was 533 when they did it for the test. I couldn't establish whether it came back and was given a Secan motor and upped to 700 or just maybe the guy is BSing - but this goes back to what Guy was saying before about the test cars.

FM9

Several of the more vocal posters on this thread have posted 60-130 data from their accelerometer based dataloggers. I am curious as to where the units are mounted when the measurements were made?

LAT

If the datalogger are GPS based and the antenna is on the roof I would suggest that they are accurate. If they are pure accelorometeres I would suggest that there is much more room for error.

GuyR

Mine is GPS (roof-mounted and 5Hz) and Accelerometer (screen mounted and 100Hz). My understanding is that the accelerometers are used for producing the data at 100Hz and the curves/data are fitted with the more accurate 5Hz GPS signal to produce the overall data series (my guess would be via some kind of cubic-spline based method of interpolation, possibly across a logarithmic index). For large changes in speed (ie the 60-130mph increment) I doubt the Accelerometer data has any real input into the accuracy, whereas for a 30-31mph time clearly it would.

FM9

Thanks for your reply Guy. I am very sure that your system is probably as accurate as the ones used by the better magazine testers. Why I ask is that many people have been quoting numbers produced by accelerometer based dataloggers and timers and claiming them to be more accurate than other measurements such as a Motec datalog trace, for example! IMO, the numbers produced by accelerometer based systems are next to worthless without us knowing more on calibrations and placement of these units. Air cooled turbos tend to squat tremendously during hard acceleration and this always exaggerates the figures tremendously.

LAT

FM9 I agree, I have an XA22 and until I learned to calibrate it properly.

At a full stop and with the GPS sensor outside the car on the roof. Before doing it this way I was getting all sorts of readings. Some we truly fantastic.

With a accelerometer only system there are too many variables that can affect the data.

Go to a GPS system compared to the cost of our toys it is a worthwhile tool, especially if you like to tinker.

TB993tt

Bump: anyone else
I wanna see this guy do the run - it supposedly puts "on" 400lb/ft in 800rpm
http://www.globalnetspace.com/porsche.html

VerySideways

I love that intercooler, and he's even kept the air con!

LAT

Wow, excellent 60' times as well, someone has experiecne launching this much power. I am impressed.

Jean

This is Dennis, a friend of DKnebes,it seems like a great setup. I tried to get him to do a 60-130mph on another forum but it did not work apparently, DKnebes said he would tell him too. 146mph trap speed is very fast and he sure has some VERY serious power (1.6-1.7 bar if I am not mistaken) but that 5 second dyno run is not exactly how I think they should be done. Also, the video is definitely accelerated if you look at how things are moving. Again not saying it is not sick fast, just my opinion.

Woodster

TOBY, JEAN,
IS THIS THE 993TT PROTOMOTIVE CAR YOU GUYS MENTIONED BEFORE?
LOVE THE WASTEGATES! AND WRAPPED HEADERS...
NOW THERE IS A TRUE "VIPER KILLER", OR HOW ABOUT SOME NEW
ZO6 CHALLENGERS ??? LOL
MK

Dknebes

Dennis has a well sorted 993tt that was built by Joe Essa of Essa Tech in Ft Lauderdale. I have not talked to Dennis for a while but I will definitely bring up the 60 to 130mph run. The Video was shot with a video phone and poor quality. Essa will have his new motor that will go into his car at the Performance Industry trade show in Orlando Dec1 Dec 2nd and Dec 3rd. The new 993tt will have substantially more power than the one built for Dennis. I know we can get Essa to give us a 60 to 130mph when he gets his monster on the road.

David

iborroel

It may have been stated but I didn't want to search but what gear should the 60-130 pull be started in or should it only be done in one gear. Thanks.

ca993twin

Ignacio,

How are you doing? How's Waldo?

You want the minimum time for your car to go from 60 -> 130, and you can use whatever gears work for you. I'd suspect that you'd start in 3rd, and use 4th and 5th. Are you going to test Waldo? Do you have an accurate way to record the speed and time?

iborroel

ca993twin: I am doing fine and so is Waldo. The car has been great after the initial problems. I will be in Thousand Oaks the week of December 5th. Maybe we can get together.

I am going to test Waldo. I may have my wife or someone else in the passenger seat recording the speedo and then from here determine the time. I would try it myself but that is a little dangerous.