0-60 in a 931, A little sad.

Wolf1 · 02-01-2003, 04:55 PM

Just thought I would share my baseline 0-60 times in totally stock form before I begin with an intercooler and more boost.

1. 8.9 sec........ too much wheel spin.
2. 9.1 sec........ not enough wheel spin.
3. 8.7 sec........ about right on launch.

45 degree outside temp.
4700 feet elevation.

AaronM · 02-01-2003, 08:25 PM

Those are about a second off of what a stock 931 ought to be doing. You sure that the car is running 100% right? The 924S which has a basically identical power to weight ratio has been clocked at a high-seven-second 0-60. Not sure about elevation though. Still, the 931 should do better at altitude because of the turbo overcoming the lower atmospheric pressure.

Aaron

CJFusco · CJFusco's Garage

931s, 924S, and early 944s should be posting very similar accelleration times (7.4-7.9ish) Perhaps your engine is just tired? it is an old car

Wolf1 · 02-01-2003, 09:20 PM

Everything we test around here seems to be about a second slower than advertised times.
99 Explorer 4.0 sohc 5 speed auto 10.8 sec
01 Durango 5.9 4 speed auto 9.9 sec
99 Mustang gt 4.6 5speed manual 7.1
95 Trans-am LT1 ws6 6speed manual 7.1
83 F150 4x4 modified EFI 460 C-6 auto 6.6 - 7.3 depending on traction.
Real world test conditions seem to vary alot, traction is a big issue on some of these, 931 included.
The engine may be a little tired, but it doesn't show it. It will be interesting to see how the mods change it.

AaronM · 02-01-2003, 10:44 PM

Quote:

Originally posted by Wolf1
Everything we test around here seems to be about a second slower than advertised times.
99 Explorer 4.0 sohc 5 speed auto 10.8 sec
01 Durango 5.9 4 speed auto 9.9 sec
99 Mustang gt 4.6 5speed manual 7.1
95 Trans-am LT1 ws6 6speed manual 7.1
83 F150 4x4 modified EFI 460 C-6 auto 6.6 - 7.3 depending on traction.
Real world test conditions seem to vary alot, traction is a big issue on some of these, 931 included.
The engine may be a little tired, but it doesn't show it. It will be interesting to see how the mods change it.

That's altitude. N/A engines lose power because of the thinner air effectively reducing compression. If the turbo has a wastegate, it ought to compensate for altitude and make full power up until the turbo is maxed-out.

Aaron

CJFusco · CJFusco's Garage

Or it might be that the guys at ROAD & TRACK are experts and know how to launch a car to get the best accelleration time results

Mark_944S2 · 02-02-2003, 10:06 AM

I think when the manufacturers test 0-60 times, they crash shift the gears - ie they doin't use the clutch. This saves 0.5s or so on each gear change. Your real life 0-60 times will be slower on a manual box as I'd assume you want the car to last and change gear normally.

Doesn't apply to automatics of course

Mark

Yan · 02-02-2003, 10:14 AM

Mark_944S2: I don't think so. The 6.0-6.5 seconds 0-60 mph acceleration made by manufacturers or R&T and C&D with the 1st gen 951 is easily achievable even when considering the gears changes. Some people even ran below 6.0 seconds in stock form.

Wolf1: What is your launching method? With your turboed car, you should make a 3000+ rpm clutch slip in order to match the magazines specs. That's not the best thing to do with a Porscha.

AaronM · 02-02-2003, 11:32 AM

Quote:

Originally posted by Yan
Mark_944S2: I don't think so. The 6.0-6.5 seconds 0-60 mph acceleration made by manufacturers or R&T and C&D with the 1st gen 951 is easily achievable even when considering the gears changes. Some people even ran below 6.0 seconds in stock form.

Wolf1: What is your launching method? With your turboed car, you should make a 3000+ rpm clutch slip in order to match the magazines specs. That's not the best thing to do with a Porscha.

Yan's right, the 924S was listed as having an 8.3 second 0-60 from the factory, but owners have listed 7.5-7.6 second times without crashing the gearbox. In my experience, R&T's performance figures are easily attainable without abusing the machinery. R&T has at times outlined their testing procedure and they always emphasize that they do not go all-out to shave those last couple tenths of a second, but rather they try to make sure that their methods are repeatable by owners without causing undue damage to the cars.

Aaron

CJFusco · CJFusco's Garage

Yeah, the previous owner told me he got 0-60 in 7.6 in my 83 944, but the average road test is probably closer to 8.0... some even got as slow as 8.4... although I have seen them as quick as 7.4 in some magazines... and yes, I do mean US spec cars.

jlamont · 02-02-2003, 03:17 PM

Porsche are known in the U.K motoring press as being pretty conservative with acceleration times. i.e The s2 official 0-62.5(0-100 km/h) figure is 6.9 seconds,however Autocar '86 acheived it in 6 dead.
Just my 2p worth.

John

jlamont · 02-02-2003, 03:19 PM

Thats '88 not 86.

John

Wolf1 · 02-02-2003, 06:26 PM

Quote:

Originally posted by Yan
Mark_944S2: I don't think so. The 6.0-6.5 seconds 0-60 mph acceleration made by manufacturers or R&T and C&D with the 1st gen 951 is easily achievable even when considering the gears changes. Some people even ran below 6.0 seconds in stock form.

Wolf1: What is your launching method? With your turboed car, you should make a 3000+ rpm clutch slip in order to match the magazines specs. That's not the best thing to do with a Porscha.

Launching between 3500 & 4000 rpm with clutch slipping a little and tires slipping a little as well. Any higher launch rpm produces too much tire spin, any lower engine bogs down a little. I may not be producing full boost, I noticed today that the O-ring seal on the turbo discharge is a little worn and loose and may be leaking some pressure. I will fix a few items and install a boost gauge and retest before any mods. The intercooler install looks like it wont be as difficult as I originally thought, I removed the windshield washer reservoir today which opens up a large passageway to the front of the car, remounted oil cooler back about an inch or so and now two 2.25 tubes will fit through there. I will replace the washer bottle with a smaller one mounted up near the battery.

MCNETT · MCNETT's Garage

Wolf1,
Where in I.F. do you live? I am originally from Ammon and go to visit my family a lot. I have a 968 coupe and know ZERO others with a Porsche.
-Mike

Wolf1 · 02-05-2003, 09:13 PM

Mcnett, I'm about 10 miles north of I.F. between Ucon and Rigby. There are a few Porsches running around in the summer. Boxsters, 911's, 914's and a really sharp 911 RUF turbo in guards red.

todwic · todwic's Garage

I think your watch is broken.