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Old 07-16-2018, 10:30 PM   #1
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Boxster 986 2,5 top speed per gear

Hi
I am searching for "top speed per gear" for a 1998 Boxster 2,5 litre, anyone have a link to where i can find it ?

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Old 07-17-2018, 05:35 AM   #2
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There should be a couple of charts in the back of your owners manual
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Old 07-17-2018, 08:18 PM   #3
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Here you go:
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Old 07-20-2018, 06:10 AM   #4
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Great chart, Any chance there is a 6 speed chart to compare?
Thanks
Shawn
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Old 07-20-2018, 06:48 AM   #5
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Originally Posted by Sveach756 View Post
Great chart, Any chance there is a 6 speed chart to compare?
Thanks
Shawn
I know this is not a first time question here so...
First I type this into a search engine: site:986forum.com gear ratio
Then I pick one of several results:

Which was posted here in 2012: 986 Sport 6Speed Gear Chart

But as stated, it is published in the owners manual.
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Old 07-20-2018, 07:24 AM   #6
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Originally Posted by thstone View Post
Here you go:
I wish my 2.5 would go 100 mph in 3rd or 170 mph in 5th. I'm not sure about this chart.
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Old 07-20-2018, 07:45 AM   #7
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I wish my 2.5 would go 100 mph in 3rd or 170 mph in 5th. I'm not sure about this chart.
The chart is about the mechanical linkage, not engine power. Shaft from the engine inputs rpm1 to the transmission, transmission outputs to driveshaft at rpm2, wheel circumference rotates over asphalt at a rate of 'distance' per 'time'. Find a long down hill slope and it should work.
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Old 07-20-2018, 08:13 AM   #8
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Originally Posted by 78F350 View Post
The chart is about the mechanical linkage, not engine power. Shaft from the engine inputs rpm1 to the transmission, transmission outputs to driveshaft at rpm2, wheel circumference rotates over asphalt at a rate of 'distance' per 'time'. Find a long down hill slope and it should work.
The chart in the back of my 2.5 owners manual has a little different chart. This chart reflects what I see when i'm driving the car. 6,500 RPM's in 3rd gear = 86 MPH GPS verified or 89 mph on the speedo.


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Old 07-20-2018, 09:57 AM   #9
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Originally Posted by tommy583 View Post
The chart in the back of my 2.5 owners manual has a little different chart. ...
Sounds good and I think that you actually have the *correct* answer for the OP's question then. I didn't post the 5-speed chart and I don't know the source. I bet it's from a 2000 or later. It matches up with the chart from the online version of the 2003 model (AV1 142 in the top right).
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Old 07-20-2018, 11:41 AM   #10
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Funny thing about reading the owner's manual

I'm as guilty as everyone else about not reading my owner's manuals for the cars I own. But on my 2003 S with the CDR 23 radio there is a TP button which stands for Traffic Program. Apparently it's there so that traffic announcements will interrupt whatever you happen to be listening to when a local traffic announcement is broadcast. In my 15 years of owning my car, only once on the Southern end of the New Jersey Turnpike has a traffic announcement come through on my radio. But the radio would always randomly beep with the message "NO TP" appearing on the radio screen. The owners' manual and radio instructions contain no instructions on how to turn off this TP function. Hit the TP button while the radio is on and it just goes mute. Even my Porsche dealer service department didn't know any way to deactivate this feature. But on one Porsche forum I found the secret procedure. It involves putting a CD in the radio, turning it off, and hitting a sequence of radio buttons as the "PORSCHE" name appears on the radio after you turn it back on. And the radio stays that way until you disconnect the battery and reconnect it again.

Sorry for the thread drift. We should all read our manuals. But sometimes when we do there are things that could be in there that aren't!
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Old 07-20-2018, 03:14 PM   #11
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Originally Posted by tommy583 View Post
I wish my 2.5 would go 100 mph in 3rd or 170 mph in 5th. I'm not sure about this chart.
I don't wish so, because no autobahn around here.... One big reason I bought a 2.5 car is its relatively short gearing so I can wind out gears, esp 2nd and 3rd, without going crazy fast beyond legal speed limit. On a ramp to interstate highway, 3rd gear topping just over 80 mph is perfect to enjoy that awesome engine growl, same with 2nd on back roads posted with 50-mph limit.

As already posted, the chart is correct but the top speed depends on engine torque and you won't be able to rev into red in the top gear...

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