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Old 12-20-2012, 01:48 AM
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Speedometer

I have 205/145R16. I think the factory is 205/155R16. Well, I noticed that my speed is off a little from the GPS. I don't know if the GPS is accurate or not. Would that small of a speed difference cause my mileage on the car to be bad? Is there a way to fix it without shelling out money to take it to Honda to get it fixed?

This might be a different question. But since it similar in question I will ask it. I will be buying a CDM cluster. I know it will be in km/h rather than miles due to it being metric. Will it be hard to turn the kilometers to match mine on the USDM after I convert it from miles to kilometres? I don't care about breaking the law to change it as I will be keeping this car don't it doesn't matter.
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Old 12-20-2012, 08:47 AM
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Re: Speedometer

how off is it? Have you tested it before? Honestly i don't think it would make that much of a difference.
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Old 12-20-2012, 09:33 AM
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Re: Speedometer

You can just swap the odometers...but im not sure how it will act since the cluster used to measure kilometers.
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Old 12-20-2012, 10:09 AM
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Re: Speedometer

I am assuming you meant 205/45r16 is and 205/50r16 (OEM) tire sizes. In any case the tire you have on your car will throw off your speed by 2-5 mph below what you are actually showing. Also all speedometers have in them a 5% error in them any way. Without getting too technical GPS systems can have errors depending on the method is uses to calculate its position relative to the satellite. All this is to say your speed will be different and you compound the error by using tires bigger or smaller than 3% of the OEM tire size.

Why would you want to switch to a Canadian cluster? There is kmph on the usdm gauge clusters, just smaller but there.
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Old 12-20-2012, 10:28 AM
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Re: Speedometer

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Originally Posted by mechie View Post
I am assuming you meant 205/45r16 is and 205/50r16 (OEM) tire sizes. In any case the tire you have on your car will throw off your speed by 2-5 mph below what you are actually showing. Also all speedometers have in them a 5% error in them any way. Without getting too technical GPS systems can have errors depending on the method is uses to calculate its position relative to the satellite. All this is to say your speed will be different and you compound the error by using tires bigger or smaller than 3% of the OEM tire size.

Why would you want to switch to a Canadian cluster? There is kmph on the usdm gauge clusters, just smaller but there.
Yeah, it's 45. The GPS show a 3-5mph negative difference. Speedo shows I'm going faster than I am. Not really a problem but it'd be nice. Since my tires are crap anyway. I'll just go back to 50 on my AP1s and hope I don't do any rubbing.

Well, I was going to get the JDM once, since I was going to be making it a S-Spec replica aside from the engine. But since the JDM one doesn't doing 240km/h and only 180km/h. I was going to get the CDM once which matches the USDM. Plus, if I forgot which Km/h I should be going I could see the mph and cheat :P
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Old 12-20-2012, 01:06 PM
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Re: Speedometer

I get the same thing, and I'm on 205/45-17's.
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Old 12-20-2012, 04:20 PM
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Re: Speedometer

Hey check this sticky out.
Recommended Tire size & Offsets!

It shows you all the tire sizes you can run without any issues. Anything outside of the oem size will change actual speed. They all also fall within the rule of thumb of tires sizes that can be recommended for the car.

Larger tires (total circumfrence) will make you under read (actual speed is higher than speedo)
Smaller tires will do the opposite.
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Old 12-20-2012, 04:29 PM
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Re: Speedometer

Quote:
Originally Posted by ZekeComa View Post
Yeah, it's 45. The GPS show a 3-5mph negative difference. Speedo shows I'm going faster than I am. Not really a problem but it'd be nice. Since my tires are crap anyway. I'll just go back to 50 on my AP1s and hope I don't do any rubbing.

Well, I was going to get the JDM once, since I was going to be making it a S-Spec replica aside from the engine. But since the JDM one doesn't doing 240km/h and only 180km/h. I was going to get the CDM once which matches the USDM. Plus, if I forgot which Km/h I should be going I could see the mph and cheat :P
I'm guessing your lowered if you are worried about rubbing with oem size . I don't know any rule of thumb for dropped cars with regards to tire sizes but I'm guessing you wanna shrink the side wall the same length your drop (which is pretty drastic) lol
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Old 12-21-2012, 06:46 PM
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Re: Speedometer

Right now, I am currently at factory. I do plan to go lower though, once I can afford some coilovers.
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Old 12-29-2012, 12:35 AM
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Re: Speedometer

look into a speedo healer i got one on my lude annd the street bike lets u adjust and has 2 memory banks so u can have a stock and aftermarket setup
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Old 12-29-2012, 12:55 AM
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Re: Speedometer

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Originally Posted by darkgsxr View Post
look into a speedo healer i got one on my lude annd the street bike lets u adjust and has 2 memory banks so u can have a stock and aftermarket setup
^ this, or you could be cheap and pop the needle off, then put it back on the correct number (take needle off, then have a friend hold the gps and steering wheel while you have the cruise control hold it at 45 and put the needle back on)

thats what i did, but speedo healer is a much less "ghetto" way of fixing it.
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Old 12-29-2012, 10:02 AM
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Re: Speedometer

watch your tach instead of speedo. use your gps to learn what speed is what in what gear at x rpm's.
nascar guys do it down pit road with a radar gun watching them for violations.

had a permanent door ajar chime in my ford ranger and the top light stayed on. i unplugged the proper fuse to stop it but speedo was also unplugged. used the tach for speed check for years until i discovered wd40 to the door hinges stops the issue.
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