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Jedi Master
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6,461 Posts
I trust my Garmin's mileage calculations 100%. With my last tire change the speedo below 50 mph is dead on with Garmin. It tends to stray slower above that but not by much. Odometer and ECU mph is off by over 5% slow. This is good for the odometer miles racked up but you need to keep it in mind when doing maintenance or fuel mileage calculations.

The onboard mpg estimation were always high by 2-4 mpg. Now it's down to 1-2 mpg high.
next tire change for sure.
 

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I'd rather do it myself
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18,966 Posts
I wanted to get some wider tires that would be an 1" taller front and rear but maintain the 40 or 45 series sidewall. But don't really need the width. So the 50 series with extra sidewall is very nice on my roads and helps fill the wheel well.
 

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Registered
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1,018 Posts
arrgh i will have to check directly on the diff for the ratio
and the sticker is gone

when i check the logged value in excel in all gear i end up with a differential ratio of 3.8 ..right in the middle of 3.727 and 3.909

that for sure it's not 3.538 like in the file
 

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Super Moderator
Joined
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13,004 Posts
Discussion Starter #24
Feel free to verify any of the values on that table with hyundaitechinfo.com, because that's where I got them from.

2010-12 2.0T M/T M6VR1
1st
4.229
2nd
2.467
3rd
1.671
4th
1.233
5th
1.000
6th
0.794
Reverse
3.985
Final gear ratio
3.909

2013 2.0T M/T M6VR2
1st
3.848
2nd
2.317
3rd
1.623
4th
1.233
5th
1.000
6th
0.794
Reverse
3.985
Final gear ratio
3.538

3.8 M/T All Years M6VR2

1st
3.848
2nd
2.317
3rd
1.623
4th
1.233
5th
1.000
6th
0.794
Reverse
3.985
Final gear ratio
3.538

2010-12 2.0T A/T A5SR1
1st
3.827
2nd
2.368
3rd
1.519
4th
1.000
5th
0.834
Reverse
2.613
Final gear ratio
3.909
Early production final gear ratio
4.101

All 2013 A/T A8LR1
1st
3.964
2nd
2.468
3rd
1.61
4th
1.176
5th
1
6th
0.832
7th
0.652
8th
0.565
Reverse
2.273
Final gear ratio
4.181

Formula's used for RPM and MPH
MPH =(((RPM*Tire diameter)/(Final Drive*Gear ratio*336.13552)))
KPH =(((RPM*Tire diameter)/(Final Drive*Gear ratio*336.13552)))x1.609344

Tire diameter formula
rotational diameter =((((section width*(aspect ratio/100))*2)/25.4)+rim size)

If there is something wrong with my equations please feel free to inform me, I don't want to be giving out wrong information.

Here's a diff sticker from a 2010 2.0T non-LSD



And here's one from a member who did a diff swap on his to get LSD



Here's an ebay link to a 2011 3.8 A/T

10 11 12 Hyundai Genesis Coupe 3 8L Track A T LSD Rear Differential 9K | eBay

And one to a 2010 3.8 M/T

2010 2011 2012 Hyundai Genesis Coupe 3 8L LSD Rear Differential 6M T 25K | eBay

^ I can't link the pictures so you'll have to go to them to view the stickers for yourself.
 

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Super Moderator
Joined
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13,004 Posts
Discussion Starter #28
They gave you the wrong pumpkin.

I did make a boo boo up there in my post, I forgot about the ZF

2009-2012 3.8 A/T 6HP19 (ZF)

1st
4.171
2nd
2.34
3rd
1.521
4th
1.143
5th
0.867
6th
0.691
Reverse
3.403
Final gear ratio
3.727


You my friend some how ended up with a ZF spec differential.

I'll ask one of the other Canadians with an R-Spec to take a pic of his differential for us, it might be a Canadian thing or a typo in the tech manual.
 

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3.8 Track Owner
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608 Posts
epic information here! thank you!
 

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GenSport KY
Joined
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868 Posts
6mt

I know you have your hands full, but have you ever found a solution to our transmissions. Woes?
 

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(╯°□°)╯︵ ┻━┻
2013 3.8 Track White Pearl
Joined
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3,092 Posts
Sort of, yes the BK2 manuals have bolt up axles but it has been proven that those bolt up stubs can be removed from the pumpkin and that they use the same splines as the non-bolt up axles, so they are still cross compatible.
 

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Premium Member
Joined
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786 Posts
Did anyone went from a 3.91 to a 3.538?
My 2011 2.0 auto with the Evo 9 kit goes trough gears really quick, it has virtually 0 lag, gas mileage is not far from my 97 z28 (19 average for the Z28 vs 21 for the Genesis)
I can get a 2014 manual with lsd for $300 they even trow the axles with it, it's a good deal and i wonder if it would help going with 3.538
 

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Registered
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1,956 Posts
Did anyone went from a 3.91 to a 3.538?
My 2011 2.0 auto with the Evo 9 kit goes trough gears really quick, it has virtually 0 lag, gas mileage is not far from my 97 z28 (19 average for the Z28 vs 21 for the Genesis)
I can get a 2014 manual with lsd for $300 they even trow the axles with it, it's a good deal and i wonder if it would help going with 3.538
Yes, if you have good amount of power, then it might be beneficial to go to 3.55 ratio - expecialy being turbo - stays longer in boost, better traction - faster car.

If you are around 350hp or up and **** lot of torque, then you would benefit going to 3.55



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