# Speedo problems
**URL:** https://forums.speedlife.net/t/speedo-problems/109653
**Category:** SON240sx Automotive
**Created:** [September 20, 2007, 6:23pm UTC](https://forums.speedlife.net/t/speedo-problems/109653 "2007-09-20T18:23:27Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@logik23](https://forums.speedlife.net/u/logik23)
#### Post date: [September 20, 2007, 6:23pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/1 "2007-09-20T18:23:27Z")
Hey I just installed my Nismo 260kmh Speedo and I have a feeling that it’s not showing the correct speed, it might just be me though. I checked the RPM at certain speeds, could someone please tell me if it’s accurate? Thanks!
S13 KA. (I think S13 SRs have same gear ratios, so it would work.)
3rd Gear: 4000=85kmh
4th Gear: 3000=83kmh
4th Gear: 3500=98kmh
5th Gear: 3000=110kmh
5th Gear: 3500=130kmh
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### Author:  [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)
#### Post date: [September 20, 2007, 6:41pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/2 "2007-09-20T18:41:58Z")
Not positive about the others, but i’m pretty sure that 5th @ 3,000 RPM should be 120km/h, just about dead on. This was with both speedometers i’ve used (stock & Euro 240km/h).
Perhaps I can try to confirm your other speeds later on if needed.
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### Author:  [@Sky14](https://forums.speedlife.net/u/Sky14)
#### Post date: [September 20, 2007, 7:07pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/3 "2007-09-20T19:07:11Z")
what wheels are u running
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### Author:  [@logik23](https://forums.speedlife.net/u/logik23)
#### Post date: [September 20, 2007, 8:13pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/4 "2007-09-20T20:13:18Z")
225/50R16, it’s the correct size and I’ve had them on for 2 years, I only installed the speedo yesterday. Maybe I’ll install my old one back and recheck all the speeds, but it’s a pain…lol
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### Author:  [@R33](https://forums.speedlife.net/u/R33)
#### Post date: [September 21, 2007, 7:13am UTC](https://forums.speedlife.net/t/speedo-problems/109653/5 "2007-09-21T07:13:36Z")
it looks about right … the stock speedos are off by about 200 rpm anyways.
i have 110 @ 3000 in 5th
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### Author:  [@kollo](https://forums.speedlife.net/u/kollo)
#### Post date: [September 21, 2007, 12:07pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/6 "2007-09-21T12:07:00Z")
3500rpm at 130km in a coupe i drive around with mine doesnt work
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### Author:  [@Jedi\_Car\_Fan](https://forums.speedlife.net/u/Jedi_Car_Fan)
#### Post date: [September 21, 2007, 12:27pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/7 "2007-09-21T12:27:56Z")
Speedo isnt accurate past 120kph regardless if you’ve changed to the 260kph Nismo Speedo.
And KA/SR Tranny’s do indeed have the same Gear Ratio’s but Rear End Gearing can vary (example, CA18 Diff is Geared lower so the revs will be higher) where as a Z32TT is geared higher so the RPMs would be lower.
But on my Speedo… anything over 120 slow gets further and further off (example, Speedo says 160kph where as the Laptop/Consult/ECU reads 145kph)
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### Author:  [@logik23](https://forums.speedlife.net/u/logik23)
#### Post date: [September 21, 2007, 2:38pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/8 "2007-09-21T14:38:24Z")
Ok, so it seems like it’s as accurate as the stock, that’s good enough for me.
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### Author:  [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)
#### Post date: [September 21, 2007, 9:30pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/9 "2007-09-21T21:30:46Z")
After re-checking, mine is at about 114km/h @ 3,000 RPM in 5th, but there is a lot of room for speed variance with very little RPM change.
I’m sure you’re fine.
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### Author:  [@samkam](https://forums.speedlife.net/u/samkam)
#### Post date: [September 21, 2007, 9:48pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/10 "2007-09-21T21:48:52Z")
I checked today and your readings seem about right. I’m running stock 15s but it still seems about the same.
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### Author:  [@logik23](https://forums.speedlife.net/u/logik23)
#### Post date: [September 22, 2007, 12:17pm UTC](https://forums.speedlife.net/t/speedo-problems/109653/11 "2007-09-22T12:17:11Z")
Ok, thanks for the help guys! I just wanna make sure I’m not 20+kmh off. lol