ANF Posted 6October, 2016 Report Share Posted 6October, 2016 All you 928 owners out there, are your speedos accurate? I keep getting passed and have people tail gate me no end, driving me bonkers. I am sticking to the same speeds as in my Merc, are 928 speedos accurate or is it just mine, alternatively is everyone else speeding up because I am in a Porsche.... Link to comment Share on other sites More sharing options...
GUT Posted 6October, 2016 Report Share Posted 6October, 2016 I reckon mine reads high by about 5kph at around 100kph. Link to comment Share on other sites More sharing options...
ANF Posted 6October, 2016 Author Report Share Posted 6October, 2016 I reckon mine reads high by about 5kph at around 100kph.Cheers. From the speeds that I am being passed by, I reckon mine is 10 km/h out at about 60.... Does anyone know if the speedo sensors can give the wrong reading? Tyres are the standard size. Link to comment Share on other sites More sharing options...
WOKA Posted 6October, 2016 Report Share Posted 6October, 2016 As discussed in the OTLW thread, compare the speedo with an app / GPS of some sort Link to comment Share on other sites More sharing options...
cyberpunky Posted 6October, 2016 Report Share Posted 6October, 2016 My car(86 952) is exactly 10 k out at every speed. I was suffering same problem for first few days(holding up traffic) till I checked it with a navman. My stereo now has satnav so I drive with speedo displayed on it and TBH am used to speedo being exactly 10 k out, so haven't bothered seeking a repair Link to comment Share on other sites More sharing options...
Dreamr Posted 6October, 2016 Report Share Posted 6October, 2016 On the way back from Brisbane in the 944, I had the same problem with holding up traffic and people overtaking me ..... worked out that it was approx. 10% out over about 40k's ..... so in the 100 zones, I was only doing 90Have been told that it's an inherent problem across the 944 / 928 range.My rear engined beauty would never let me down like this! ..... Link to comment Share on other sites More sharing options...
Timm Posted 6October, 2016 Report Share Posted 6October, 2016 My 944 over reads by about 10km/h...no big deal. What annoys me though is that means it also over reads on the odometer. I checked it against some 5km markers on the highway, and it read 200m over. Link to comment Share on other sites More sharing options...
90sF1Kid Posted 6October, 2016 Report Share Posted 6October, 2016 I noticed my 944 is also like this, but I think it's not uncommon. My 08 WRX is also 10 km out at 100 Link to comment Share on other sites More sharing options...
ANF Posted 6October, 2016 Author Report Share Posted 6October, 2016 Thanks for the replies guys, seems like 928s and transaxle Porsche do not have very accurate speedos! Sad as their cross town rivals, Mercedes have extremely accurate ones which is what I am used to! Will need to figure out a way to drive to the limit without exceeding it, not a fan of digital supplementary readouts.....Cheers My rear engined beauty would never let me down like this! ..... Just kill you with its deadly handling traits ..... Link to comment Share on other sites More sharing options...
KGB Posted 6October, 2016 Report Share Posted 6October, 2016 Just do the maths on the fly 44, 55, 66, 88, 110, 120 its that easy!Here in the police state they give you 2-3km/h except in 110 zones. Link to comment Share on other sites More sharing options...
P-Kay Posted 6October, 2016 Report Share Posted 6October, 2016 Just do the maths on the fly 44, 55, 66, 88, 110, 120 its that easy!Here in the police state they give you 2-3km/h except in 110 zones. That's about right for the 996 and apparently that is a purpose built feature to save you speeding Link to comment Share on other sites More sharing options...
ANF Posted 6October, 2016 Author Report Share Posted 6October, 2016 I expected more from Porsche...... Link to comment Share on other sites More sharing options...
tazzieman Posted 7October, 2016 Report Share Posted 7October, 2016 It's normal for these old Porsches. The factory built in the inaccuracy to save you from speeding fines. You should be grateful!And of course Link to comment Share on other sites More sharing options...
ANF Posted 7October, 2016 Author Report Share Posted 7October, 2016 You should be grateful! No, annoyed, if Mercedes can do, among many others then Porsche should be able to, it is not a little bit out it is way out....! Link to comment Share on other sites More sharing options...
tazzieman Posted 7October, 2016 Report Share Posted 7October, 2016 No, annoyed, if Mercedes can do, among many others then Porsche should be able to, it is not a little bit out it is way out....!10% is within normal limits , given age etcDoesn't bother me , I just drive according to the prevailing conditions. Link to comment Share on other sites More sharing options...
cyberpunky Posted 13October, 2016 Report Share Posted 13October, 2016 What you are missing is, it is out exactly 10 kph at all speeds if it is like mine. GPS can confirm. It is not 10% out, it is wrong exactly 10kph all the time, so it actually is very accurate, if you compensate for the 10 k, so 40 is 50, 50 is 60, 90 is 100 etc. I have not checked above 110 kph of course YMMV or maybe that should be YKMV Link to comment Share on other sites More sharing options...
ANF Posted 13October, 2016 Author Report Share Posted 13October, 2016 What you are missing is, it is out exactly 10 kph at all speeds if it is like mine. GPS can confirm. It is not 10% out, it is wrong exactly 10kph all the time, so it actually is very accurate, if you compensate for the 10 k, so 40 is 50, 50 is 60, 90 is 100 etc. I have not checked above 110 kph of course YMMV or maybe that should be YKMV Cheers.What is with all the acronyms these days, I continually have to look them up! Am I that old (the answer is no by the way!) Link to comment Share on other sites More sharing options...
TINGY Posted 13October, 2016 Report Share Posted 13October, 2016 Both of the 944's i have owned were about 7-10 kms out depending on the speed i was doing. Link to comment Share on other sites More sharing options...
tazzieman Posted 13October, 2016 Report Share Posted 13October, 2016 Both of the 944's i have owned were about 7-10 kms out depending on the speed i was doing, officer Link to comment Share on other sites More sharing options...
TINGY Posted 14October, 2016 Report Share Posted 14October, 2016 Haha Tazzie, what i meant was that between 60-110kmh, the speed at which my speedo is under varies. Link to comment Share on other sites More sharing options...
PomBstard Posted 17October, 2016 Report Share Posted 17October, 2016 Just checked mine today against a gps - over-reads by about 2-3kmh up to about 80kmh. It's a bit of a guess for me as my speedo has mph as the major scale, with kph in smaller type. But it all seems to match up - indicated 38mph/61kmh is gps 59kmh and indicated 52mph/83kmh is gps 80kmh for example. Pesky imports... Link to comment Share on other sites More sharing options...
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