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post 1 of 18 Old 10-31-2010, 05:11 PM
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Default transmission gear ratio/differential ratio

just got pinched for speeding and found out my licence was expired.

here in canada we have a team of ex police who run an organization called *ointts. Its sunday right now and I obviously can't contact them but I've started my homework. I've used this co. before to successfully beat a speeding ticket and figure that this time it might be a bit more difficult.

I am checking out websites to gather info on the effects of other than OEM tire sizes on speed calculations, my argument being that maybe I just switched my tires to some goofy size. What I also would like to know are TRANSMISSION GEAR RATIO as well as DIFFERENTIAL RATIO (final drive) for 2004 g35 coupe mt in order to calculate gear speed data.

Any help would be greatly appreciated.

Also, anyone have any first hand experience with after market modifications done in Canada. I am currently checking out a performance shop in Regina, Sask. I'm not sure about the ethics of using company names on this site. Looking to get into the 500 hp range.


Thanks for now
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post 2 of 18 Old 10-31-2010, 06:00 PM
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How far over the speed limit were you?

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post 3 of 18 Old 10-31-2010, 06:55 PM
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134 in a posted 100 kmph.

We live in a small community of about 400. I have a bit of a reputation with the local rcmp. I beat a totally bogus set up ticket a couple years ago and mistakenly let my invincibility get the better of me. I have a bel sti driver which has always helped me out but i figured this guy wouldn't pinch me since he already had someone in his clutches. Instead he came and got me and went back to his original, finished his business and then came back for me. I mean do the math I could've easily got rid of him but figured it wasn,t worth running for a few hundred bucks. Its not the 480$ i'm worried about but moreso my licence. Just want some specs so i can provide some reasonable arguments once this goes to court. Been through this before just need the numbers.

any help would be greatly appreciated
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post 4 of 18 Old 10-31-2010, 07:49 PM
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i dont know any specs but i cant imagine tire size affecting your speed by 34kmph

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post 5 of 18 Old 10-31-2010, 08:56 PM
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You can use this site to find out what different tires will do to your actual vs. indicated speeds.
Tire size calculator

You will find that you'd need some pretty gigantic tires for that argument to make even the smallest sense. Also with that size there's no way you wouldn't be able to tell the tires were odd and even then they probably wouldn't fit in your wheel wells or would throw off the traction control so badly that you wouldn't be driving fast in the first place.

My adivice is just man up and take it. There is no way you don't know you are doing 83 mph in a 62 mph zone

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post 6 of 18 Old 10-31-2010, 10:33 PM
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Just to add some clarity

I am not looking for tires that will change my speed from 134 to 100. I would need to run tractor tires to do that, i have a stock g35 not a monster mudder. secondly, even the smallest changes in your tires most certainly do make appreciable changes with respect to actual vs. spedo speed. for example running 255/55/18 instead of 245/45/18 will make actual speed of 109 vs. spedo speed of 100.

In order to beat a ticket we need to prove that the spedo speed is out, this will get you off with a lesser offence, therefore less points, less ticket fine, less insurance increase.

I never said "I didn't know" i was doing 83 in a 62. I am not claiming ignorance, sorry if you misunderstood. I realize that tires that huge wouldn't fit in the wheel wells and I also realize that it would greatly compromise the function of my performance automobile.

Its not a matter of manning up, its a matter of beating the heat.

thanks for the adivice
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post 7 of 18 Old 11-01-2010, 11:41 AM
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Well, I wish you luck, but I don't see this going anywhere. Maybe in Canada its different, but here they are just going to say that you are ultimately responsible for knowing how fast you are going. Kinda like if your speedo is broke, its your responsibility to fix it. Or, if you are running different size tires, its your responsibility to know this and adjust your speed accordingly. I guess its worth a shot, but I wouldn't get my hopes up if I were you. Let us know what happens!
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post 8 of 18 Old 11-01-2010, 12:07 PM
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^^^ exactly
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post 9 of 18 Old 11-01-2010, 01:25 PM
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i've already beaten a ticket a couple years ago for 50 kmph over which would result in loss of licence. I am fully aware of how the system works in the country in which i reside, just looking for some tech data and thought that this might be the place to start. What happens here (which people don't realise) is that if i can prove my spedo is incorrect then i can have this infraction lessened. its all about saving points, saving dollars, and keeping the insurance down. obviously i could choose to drive the speed limit but i might as well buy a 4 cylinder piss cutter.
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post 10 of 18 Old 11-01-2010, 02:17 PM
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post 11 of 18 Old 11-01-2010, 07:54 PM
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I was going to suggest infinitihelp.com.

'06 Autumn Copper FX35 & '11 Alpine White Sentra
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post 12 of 18 Old 11-01-2010, 08:00 PM
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sure you were
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post 13 of 18 Old 11-01-2010, 08:23 PM
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I just didn't want to look it up.

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post 14 of 18 Old 11-01-2010, 08:43 PM
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because you are so unfamiliar with that site...
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post 15 of 18 Old 11-02-2010, 08:41 PM
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exactly. i only go there a couple of times a week

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