I'm curious about the 0-60 times quoted e.g. in the Owner's manual for a 964 Tiptronic. Is the time measured using the fully automatic D position, or when using the manual shiifter (so allowing a start in 1st)?

There must be a difference, right? My assumption would be that using the manual shifter would gain a little time.

 

First, you will get your best time by putting it in 3rd in the Auto mode, or using the Manual dropped to 1st. In "D", the car will want to start in 2nd, then a split second later, downshift to 1st.

I have found that the published 0-60 time is WAY conservative. I use an Escort G-timer and consistantly register mid 5's, with the best at 5.30.

 

Hi Lou ... thanks ... mid 5s is impressive!

Would you say that the non-Tip car is slower, then ... assuming stock, equally talented drivers etc.?

And why do "official" figures never specify how they used the Tip to get their result?

 

I would have to say that a 5 speed is certainly faster than a Tip. There is better gearing ratios with the 5 speed, and no losses thru the torque converter.

As to the "official" figures, Porsche is conservative in their posted data. I'm dyno-ing a 16 year car at 210 RWHP, which after conversion losses, should equal over 265 engine HP, this out of a 247 HP claim from the factory. Porsche makes sure that the worse engine out the door will meet their claims.

 

Agree with LouZ and don't forget the added weight of the automatic transmission will keep the 0-60 time above the Manual as well.

LouZ, isn't your 0-60 time also with the brake on as you rev the rpms up before you lanuch from start? Still impressive!!! Any mods on your TIP?

 

I thought the magazines had the tip in the high 6's, and I assume they beat the crap out of the cars when testing....I'll dig up my old road and track tonight...mid-5's seems too fast for a stock tip. I hope it is right (becuause that would make my 5-speed even faster ), but I have a feeling that's too fast.

 

When I do a 0-60 run, I will hold the brake and bring the revs up to ~1800 RPM, then launch. This gives me my best time, but it is not something that I would want to repeat too often. As for mods, just a G-pipe on the exhaust.

I must note that the readings from the Escort G-timer use a series of accelorometers to calculate time over distance, so the accuracy is relative. The claim is that it is accurate to better than 10ths of a second.

 

Andrew, I reread my post and it should have said the tip due to the weight will have a 0-60 above a Manual instead of below a Manual. I made the correction.

Here are some times I found:

March 1991 Car & Driver has it at 6.1 sec.
June 1992 Automotive Magazine has it at 5.5 sec.
The 1993 Porsche brochure has it at 6.4 secs.

My next Mod is a G-Pipe, not for the performance but for the sound. Just have to find time to install it. I would take the average of the three times above and Louz's time and call it around 5.8 secs.

 

All I can find is a 1990 Road & Track 0-60 of 6.9 for a C2 tip coupe vs. 5.4 for the stick....whether the difference is that much I don't know...that's the only magazine I have with tiptronic times in it.

-Andrew

 

The variance in reported 0-60 times for the tip car looks similar to the variance reported on the RS America (anywhere from 4.6 to 5.2 seconds).

 

5 speeds are always better than 4 I just wish the tip was a 5 speed unit.

 

Wow Lou, most dynos use a 16% loss conversion, your figures use a 26% loss, which is really high. My dyno came in at 213rwhp which became 255hp using 16%. Are you sure about that?

 

I was told, and I believe there are old threads, that losses vary according to type:

C2 - Manual = 18%
C4 - Manual = 24%
C2 - Tip = 26%

Only stating what was relayed to me.

 

An interesting discussion. On the RS 0-60 times, I know I have never seen anything near the mid-4's- that would be turbo 3.6 land... I'm certainly not bashing the 964's acceleration, but from what I have read over the years, on the fastest times I have seen, none of the stock 5-speeds can get lower than low 5's, and none of the stock tiptronics can get into the low 6's... I'd trust the 3rd wheel magazine tests as the most accurate measurement over the portable devices...

-Andrew

 

Source of the 4.6 second claim: Car and Driver, Dec 1992 road test. I believe they used a third wheel to test in those days...
http://www.rsamerica.net/articles/ro...Car&Driver.htm