Nissan Car Lounge - Almera, Juke, Latio, Qashqai, Sylphy, Teana Owners > Latio
Tachometer Reading at Cruising Speed
CustomGolf:
--- Quote from: a40x on August 03, 2008, 07:42:58 AM ---For mine at 80km/h at 2000rpm, 90km/h at 2100rpm, 100km/h at 2200rpm. Driving AT.
--- End quote ---
You sure bro, your meter dial is 200rpm per mark so at 100kmh it should be 2 marks above 2k so it should be 2.4K rpm. Unless you're saying your meter dial is just 1 mark above 2k when you're at 100kmh.
clarence:
Perhaps he upgraded his rims and tyres to a wrong size and hence his speedometer is giving an incurrate reading - slower reading than actual speed.
Jazz:
--- Quote from: CustomGolf on August 03, 2008, 11:01:56 AM ---Nope, I don't think there will be a difference in READING the speed on you meter dial when you up your tyre size, it's still based on your standard tyre size unless your car is so futuristic that speed is not measured using parameters preset in the ECU or based on your wheel rotation speed but an external source or you've re-calibrated your meter after changing wheels.
I'm using 205/55/16 and my rpm is still at 2400 when I'm travelling at 100kmh.
--- End quote ---
Google and read about the tire profile size do affect speedometer reading. The ECU unable to re-calibrate to the new rim size and tire profile for your info. Bear in mind that our speedometer is analog, not accurate to gauge or judge the actual speed or RPM.
Lastly your speedometer reading with 205/55/16 is 1.67% slower compared to your stock size
CustomGolf:
--- Quote from: Jazz on August 03, 2008, 12:24:35 PM ---Google and read about the tire profile size do affect speedometer reading. The ECU unable to re-calibrate to the new rim size and tire profile for your info. Bear in mind that our speedometer is analog, not accurate to gauge or judge the actual speed or RPM.
Lastly your speedometer reading with 205/55/16 is 1.67% slower compared to your stock size
--- End quote ---
That is precisely what I'm trying to explain, it shows 100kmh and tacho is 2.4k rpm, I'm going above 100kmh but it's not registered. It just don't show up in your meter dial so it should show the same no matter what tyres you're on. Those 2 figures are constant no matter what rims and tyres you're on unless you go calibrate. So where did the variance come from if every one is using the same gear box ratio and same calculation of tyre circumference.
clarence:
Use the link below to gauge if your tyre and rim upgrade is of the correct size.
If the size is incorrect, you are likely to get incorrect speedometer reading.
http://www.miata.net/garage/tirecalc.html
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