How fast should a 964RS be ?

[ChrisW]

I have the standard Mag wheels with 205/50 17 and 255/50 18 PS Cups.

The speedo reads the same as my GT3 when I am really trying --- standard PS2 tyres fitted.

Should it ?

 

[Ian964]

The standard rears are 255/40x17, rather than 18 - are you sure you've got 18s? 964 speedos are notoriously optimistic, by about 5-10% - at 100mph by GPS my speedo shows just about 110.

 

[ChrisW]

Sorry Ian, typo --- 17's all round --- and 255/40 on the rear.

I think GPS on both is the answer --- if I have a microsecond to look !

 

[TJW964]

ORIGINAL: Ian964

The standard rears are 255/40x17, rather than 18 - are you sure you've got 18s? 964 speedos are notoriously optimistic, by about 5-10% - at 100mph by GPS my speedo shows just about 110.

That's odd. Mine is out by the same amount.
My GPS usually tells me the same as my radar detector.
I don't think they had invented either when the car came out of Germany.

 

[Melv]

My Cup Car restricted to 173mph.....[]

 

[ChrisW]

I forgot to post the results.

GT3 over-reads by 5%.

964RS over-reads by 10%.

But in the 1992 v 2005 stakes, the 964RS is just astonishing.

 

[DSCBoy]

Talking about speed, out of interest, assuming a standard RS gearbox and final drive, what do we think the red line in 5th should equate to? (Given I´m running standard 3.8 RS Speedlines, sorry haven´t learnt the sizes yet)

 

[Andy Tims]

ORIGINAL: Melv

My Cup Car restricted to 173mph.....[]

Whilst very very good for an early 90's 911, MK1 GT3's should run to at least the factory quoted 189mph given enough space, so no a (relatively standard) 964RS won't have such a high top speed, which I believe was ChrisW's question.

 

[Andy Tims]

ORIGINAL: ChrisW
But in the 1992 v 2005 stakes, the 964RS is just astonishing.

Agreed.

 

[Melv]

ORIGINAL: DSCBoy

Talking about speed, out of interest, assuming a standard RS gearbox and final drive, what do we think the red line in 5th should equate to? (Given I´m running standard 3.8 RS Speedlines, sorry haven´t learnt the sizes yet)

Prob about the same as my Cup Car.

BTW, that 173mph was thru a speed trap at Brunters, so speedo prob on about 305 klicks with speedo error..........

 

[ChrisW]

ORIGINAL: Andy Tims

ORIGINAL: Melv

My Cup Car restricted to 173mph.....[]

Whilst very very good for an early 90's 911, MK1 GT3's should run to at least the factory quoted 189mph given enough space, so no a (relatively standard) 964RS won't have such a high top speed, which I believe was ChrisW's question.

It was actually acceleration up to about 120 on a fairly tight section --- against a GT3 kII !

But the PSCups were giving me an extra few MPH through the coners over the PS2's on the GT3.

 

[clubsport]

ORIGINAL: Melv

ORIGINAL: DSCBoy

Talking about speed, out of interest, assuming a standard RS gearbox and final drive, what do we think the red line in 5th should equate to? (Given I´m running standard 3.8 RS Speedlines, sorry haven´t learnt the sizes yet)

Prob about the same as my Cup Car.

BTW, that 173mph was thru a speed trap at Brunters, so speedo prob on about 305 klicks with speedo error..........

Really Melv?...considering your car is perhaps a shade lighter than a regular RS, has a tuned engine above 300bhp and aerodynamic mirrors, these factors all help toward a higher top speed over the distance run at Brunters.....I would be suprised to see a standard RS reach any more than low 160's over the same distance..

 

[OllieW]

I took my RS to Bruntingthorpe in 2005 not long after I got it and did a few runs down the long straight. On every run we were hitting the rev limiter in 5th with the speedo showing somewhere in the region of 185mph, didn't have any GPS to verify it but I worked out that the gearing means the car would have been doing something like 170mph.

Pretty quick in a 15 year old car.

 

[SimonExtreme]

The red RHD cars have always been particularly strong.............[] (Look out, here comes Des - ducks for cover[])

 

[clubsport]

Hhhmmm!!..Factory data for STANDARD 260 bhp car is 0-62mph = 5.3 secs and maximum speed 260 km/h = 162mph.

Either you chaps attaining speeds above 170mph are not running standard bhp cars or have incredible driving ability? []

 

[OllieW]

I would love to put it down to driving ability... []

I've had my car on two rolling roads (Weltmeister & a portable one at Spa) and it recorded approx 290bhp so one of the previous owners must have spent some money on improving it somehow. Both my passenger and I were astounded how quickly the car pulled the rev limiter in 5th!

 

[clubsport]

Right, we have established it is not a standard 260bhp car,,,,dare I say it a 320 bhp engine in one may be faster still to make use of the available gearing....wouldn't fancy over revving it or keeping the car on the same side of the road over bumps though at that speed []

 

[DSCBoy]

I can vouch that with 450bhp, the rev limiter is in permanent danger... ;-)
Melvs estimate of 305kph on the speedo at the limiter is bang in line with what I reckoned looking at the speed at 2k, 3k and 4k revs in 5th (but as u point out, above there, concentration is trying not to die rather than risk looking at the dials... does move around a lot...)

 

[Damen]

At 170 (that's GPS and not the speedo) read the GPS not me,my car is rock solid. Also, there was still more to go, and yes my car is not standard.

Damen

 

[Damen]

That should have read:

"read by the passenger not me"

Damen