Singh K

Heya all..

Fairly new to the porsche world. Im driving a tip and wanted to know if its safe to change gears in the manual mode at about 6,800 rpm or should i shift earlier ??...

appreciate your help..

Karan

Steve Weiner-Rennsport Systems

Hi:

First, I will tell you that you are at the rev limiter at 6750 and you oughta shift before you hit that. Its much easier on the engine.

Lastly, you are well past peak HP and torque at or near the rev limiter and I'd suggest shifting at 6400-6500 for max performance when you need it.

Normally speaking, I'd suggest a shift at 5500 or so when in Manual.

Enjoy!

Bins

But dont bother after 4th

Singh K

lol.. yeah

thanks guys

rcwelch

Correct me if I'm wrong, but I don't believe the "smart" chip in the Tiptronic will let you rev that high or let you over rev the engine...manual mode or not.

Singh K

well actually it does.. my car revs all the way to 7000 rpm shifting from the second to the third gear.. and about 6800 rpm from 3rd to 4th...

Bins

The other day I managed to reach 6500ish in my tip. There were cars ahead that stopped me going higher to test that theory. I think it probably would have let me reach 7000ish.

Singh K

i tried it again last nite and yup..upto 7000 for sure... <img border="0" title="" alt="[Wink]" src="wink.gif" />

Speedraser

How, given the rev limiter, can you reach 7000? Is the tach optimistic, or is the limiter not working?

Singh K

speedraser:

Well its different in a tip, since we only have 4 speed..unlike a 6 speed manual.

STLPCA

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Singh K:
<strong>Well its different in a tip, since we only have 4 speed..unlike a 6 speed manual.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Seve
The maximum permissible engine rpm is unrelated to the transmission. It's 6700 rpm in my '96 993 (per my owner's manual) - 6 speed manual or 4 speed tip.

Tim Ashfield

Seve,

Dan is absolutely correct 6700rpm manual or tiptronic, even the turbo is pretty close at 6720rpm. Either your tach is over optimistic or your limiter is not operating correctly. If it is the latter you should get this checked as you are exceeding the maximum permissible engine rpm .

914und993

My father has a 1996 993 with Tiptronic, and for the life of me I can't get it to let me within 300 rpm of redline, even in "manual" mode.

Chip

STLPCA

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by 914und993:
<strong>My father has a 1996 993 with Tiptronic, and for the life of me I can't get it to let me within 300 rpm of redline, even in "manual" mode.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Chip
Your dad probably has the "don't trust my son" switch activated.
Seriously, the tip may be smarter than you think - by 6000 rpm you're leaving the engine's power band.

914und993

My Dad? Not trust me? Why I've never more than lightly damaged a Porsche on a couple - err, several - occasions, he wouldn't be worried about me, would he?

What you say about shifting short of the 6700 rpm redline being faster is true in cars with more closely spaced gears. With the stock 6 speed 993, in 3rd, 4th, and 5th gears it is theoretically faster to shift up before 6700 rpm - though not by much at all. The benefit of short shifting would be more apparent with a 993 equipped with the RS 6 speed transmission, since its gearing is more closely spaced. If I had the gear ratios of the RS, I could run the calculations to get a better idea.

In a Tiptronic equipped 993, with only 4 forward gears, it is definitely not faster to shift up to the next gear before 6700 rpm. The gears are so widely spaced that there is a big drop in drive power to the rear wheels with each upshift even when you take the previous gear to redline.

So getting cheated out of a few hundred rpm at the top end by my Dad's Tiptronic really is significant!

Chip