What RPM is your car at at 70mph?

[henry944]

Hi everyone, newbie here!

Ive recently bought my first 944 and I truly love it. However compared to other cars ive owned it revs quite high. Im probably being stupid but my 1987 2.7 Lux runs at 3800rpm at 70mph. Is this normal?

What about your cars?

Thanks a lot
Henry

 

[zcacogp]

Henry,

The gearing on different gearboxes differs quite considerably.

There is a good list of ratios here:

http://www.clarks-garage.com/shop-manual/trans-04.htm

... but you will need to identify your gearbox from the list.


Oli.

 

[944 man]

Porsche didnt make a 2.7l 1987 944. The 2.7l engine was introduced in September 1988 for the 1989 model year.

 

[DavidL]

Henry,
As Oli says there are lots of variations - although he only used to going slowly [] in his S2

3800 does seem quite high - I think my turbo is doing more like 2800 at 70. But they are different cars/gearboxes/diffs etc.

Who has a 2.7, that would be the best comparison.

 

[Mike_Pollock]

Pretty close to 3000 is 70 satnav speed on my standard 2.5.
3800 is more like 70 in 4th!
I do have a second speedo which 70 Satnav speed only shows as approx 65.
Sounds like tacho or speedo is out by quite a bit unless you have VERY small wheels/tyres.
Suggest check with a satnav to find out which.
Most of the normally aspirated cars run at about 3000 at 70 mph.
Mike

 

[Bob]

I have a 1989 owners manual and it has the graph for RPM vs Roadspeed at the back. It shows a 2.7 Lux in 5th gear should be at 3100rpm at 70mph. Sounds like your rev counter or speedo is faulty or someone has swapped the gearbox and/or fitted really low profile tyres

 

[zcacogp]

ORIGINAL: DavidL
As Oli says there are lots of variations - although he only used to going slowly [] in his S2

Cheeky Bu99er!


Oli.

 

[henry944]

Thanks for the gear ratio website. Its actually a 1985 car with a 1988 (what i thought was a 1987) 2.7l engine in it. But i thought it would be more easy to just say 1987 2.7l!

I thought 3800rpm was a bit high too...

Changing the engine from a 2.5 to a 2.7 wouldnt affect the RPM would it?

 

[henry944]

Great! thanks a lot for the info...

The car does have small 15" alloys but their not that low profile tyres i think?! Il try get a picture up. Speedo/Rev counter being out could definitely be a possibility seeing as though its a 24 year old car!

Thanks again

 

[944 man]

Youve probably got the original transaxle, although theyre similar (my 2.7 transaxle is a damned sight louder than my earlier cars mind...). Before you start looking at the code (its hard to get to), Id be sure that your speedometers reading matches your roadspeed.

Simon

 

[Mike_Pollock]

15" is fine for me!

Mike

 

[DavidL]

ORIGINAL: zcacogp

ORIGINAL: DavidL
As Oli says there are lots of variations - although he only used to going slowly [] in his S2

Cheeky Bu99er!


Oli.

Well since Nick deserted for a beetle someone's got to remind you of the error of your ways!

Henry,
Coming home in my Caterham, that does 4K at 70 so a 944 at 3800 really doesn't sound right. Hopefully just a "reporting" error.

 

[PSH]

70mph in five??.... hmmm.. I've only just changed up from second at 70mph and getting ready to hit the red line and change up to fourth a few seconds later...[8D][8D]

seriously though in the turbo 70 is below 3000rpm , I would need to take a drive and test it to give you a true figure, not that this would help much in regards to a 2.7... [8|][8|]

 

[zcacogp]

ORIGINAL: DavidL
Well since Nick deserted for a beetle someone's got to remind you of the error of your ways!

Ahhhh, you're taking on Appletonn's role? [&:]

OK. It's gloves off with turbo owners again then! []


Oli.

 

[ChasR]

Mine does around 2700-2800rpmat 70mph and slightly more than that a 'GPS' 70mph (still below 3krpm).

I think the earlier cars revved higher. I know my 1.6 205 GTi does 3800rpm in 5th! But that's also a very revvy engine with not much torque, quite different to a Porsche engine.