Gear Ratios
#1
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![Question](https://acurazine.com/forums/images/icons/icon5.gif)
Ok, so I knew that ther was a slight difference in final gear ratio from teh 5AT to the 6MT, but I had no idea that it was this big. In my 5AT it used to rev about 2500RPM (at 130Kph) while my 6MT revs about 2800 at the same speed.
Here are some specs that I pulled:
6-speed manual transmission
1st - 3.933
2nd - 2.478
3rd - 1.700
4th - 1.250
5th - 0.976
6th - 0.771
Reverse - 4.008
Final Drive - 3.286
5-speed automatic transmission
1st - 2.563
2nd - 1.551
3rd - 1.021
4th - 0.653
5th - 0.470
Reverse - 1.846
Final Drive - 4.428
So... here is my problem... according to the specs... the 5AT has a higher ratio and should therefore rev higher at the same speed as the 6MT.
Here are some specs that I pulled:
6-speed manual transmission
1st - 3.933
2nd - 2.478
3rd - 1.700
4th - 1.250
5th - 0.976
6th - 0.771
Reverse - 4.008
Final Drive - 3.286
5-speed automatic transmission
1st - 2.563
2nd - 1.551
3rd - 1.021
4th - 0.653
5th - 0.470
Reverse - 1.846
Final Drive - 4.428
So... here is my problem... according to the specs... the 5AT has a higher ratio and should therefore rev higher at the same speed as the 6MT.
#2
Final drive ratio is the differential gear ratio. You still have to account for the transmission gear ratio.
The effective ratio is the final drive X gear ratio.
6sp=2.534
5mt=2.08
So the higher ratio is the 6sp which, as you said, does rev higher.
Now when is sombody going to make some lower gears and a LSD for the AT?
The effective ratio is the final drive X gear ratio.
6sp=2.534
5mt=2.08
So the higher ratio is the 6sp which, as you said, does rev higher.
Now when is sombody going to make some lower gears and a LSD for the AT?
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Originally Posted by Joe5.0
Yeah the important figure is the effective gear ratio, as roo said. As you can see the 6spd is alot more tightly spaced vs. the 5at.
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Originally Posted by RooEng
Final drive ratio is the differential gear ratio. You still have to account for the transmission gear ratio.
The effective ratio is the final drive X gear ratio.
6sp=2.534
5mt=2.08
So the higher ratio is the 6sp which, as you said, does rev higher.
Now when is sombody going to make some lower gears and a LSD for the AT?
The effective ratio is the final drive X gear ratio.
6sp=2.534
5mt=2.08
So the higher ratio is the 6sp which, as you said, does rev higher.
Now when is sombody going to make some lower gears and a LSD for the AT?
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Originally Posted by civicking
yeah but in a top speed test with the limiter removed and the car set up right the 5AT trans would leave the 6MT in the dust, i think i figured out the top speed to be something like 180 vs 220 or something, i did it a while back.
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#7
TQ > MPG
Theoretical top speed:
6spd = 207mph
5at= 251mph
Thats redline in top gear. Yeah, so thats pretty much worthless since both cars would need alot more hp than they are capable of to reach redline in top gear.
6spd = 207mph
5at= 251mph
Thats redline in top gear. Yeah, so thats pretty much worthless since both cars would need alot more hp than they are capable of to reach redline in top gear.
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Originally Posted by Joe5.0
Theoretical top speed:
6spd = 207mph
5at= 251mph
Thats redline in top gear. Yeah, so thats pretty much worthless since both cars would need alot more hp than they are capable of to reach redline in top gear.
6spd = 207mph
5at= 251mph
Thats redline in top gear. Yeah, so thats pretty much worthless since both cars would need alot more hp than they are capable of to reach redline in top gear.
#9
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This is a quick chart I made some time ago; 2002 timeframe.
Code:
Gear 6M Overall MPH 5AT Overall MPH 1 12.924 40.4 11.349 46.0 2 8.143 64.2 6.872 76.0 3 5.586 93.5 4.521 115.6 4 4.108 127.2 2.891 180.7 5 3.207 162.9 2.081 251.1 6 2.534 206.2
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Originally Posted by mrsteve
You'd need un-Godly amounts of horsepower to even come close to 200 MPH ![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
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Originally Posted by scalbert
This is a quick chart I made some time ago; 2002 timeframe.
Code:
Gear 6M Overall MPH 5AT Overall MPH 1 12.924 40.4 11.349 46.0
Steve... you must have a hell of time launching with all that HP. I have a hard time with a normally aspirated 6MT.
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Originally Posted by goredcar
So why is it that auto's get a better launch than 6 speeds? Given the lower ratio with the auto, one would think that they would be at a disadvantage. If it related to best ratio / HP combination for traction?
As per the numbers I provided, the numerically high overall ratio of the 6MT, 12.924, is actually a shorter gearing ratio than 5AT, 11.349.
So the 6MT has a shorter 1st gear. Combine that with a solid connection, a torque converter in an automatic is somewhat forgiving when launching as it is a fluid connection, to the drive wheels makes launching more difficult. Your only option at launch is the work the clutch to smooth the power delivery, a torque converter takes care of that in an automatic.
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Originally Posted by goredcar
Steve... you must have a hell of time launching with all that HP. I have a hard time with a normally aspirated 6MT.
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Originally Posted by goredcar
Steve... you must have a hell of time launching with all that HP. I have a hard time with a normally aspirated 6MT.
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Originally Posted by scalbert
When I had my CL-S6 SC/IC (369 WHP and 310 WTQ) I was finding that launching in 2nd was giving me quicker results. I just couldn't control 1st well enough to do anything other than just spin at anything more than 1/2 throttle.
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Originally Posted by scalbert
When I had my CL-S6 SC/IC (369 WHP and 310 WTQ) I was finding that launching in 2nd was giving me quicker results. I just couldn't control 1st well enough to do anything other than just spin at anything more than 1/2 throttle.
I also agree with your earlier point re the fluid connection in the auto rather than the solid connection on the 6MT. Makes it a lot easier to launch an auto. Too bad that Acura doesn't make an auto that holds up.
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Originally Posted by mrsteve
Awesome ![Too Cool](https://acurazine.com/forums/images/smilies/toocool.gif)
![Too Cool](https://acurazine.com/forums/images/smilies/toocool.gif)
As you can see, it is nice having traction for low speed acceleration. The highway pull pales in comparison to what my CL-S6 SC/IC would do.
Speed Chart
Gs Chart
Oh yea, I tested the //M Roadster and got 5.4 seconds to 60 MPH in three seperate test runs. I got 8.9 in the Sienna with the girls and Jennifer in the car with the AC on.
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Originally Posted by mrsteve
It's all about tire selection and throttle control. Stock tires suck. Stock size tires suck. With a 235/45 Falken tire I can actually start out soft, go WOT by 2500rpm and get traction all the way up to around 6000rpm where it will break loose again.
#21
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Originally Posted by CL FWD SPEED
what about Bridgestone Potenza SO-3's? 225/40/18 I have them equipped.....are they as good as falken tires???
The only thing I would look to see is if they meet the load rating required by the CL, as it is fairly high (93 I believe) compared to many other cars.
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The pole posistions are extremely soft and will not last very long at all (think 15,000 miles). However they are supposed to be amazing in the corners.
I'm running the Falken Ziex 512 in 235/45 on stock rims. Happy for now.
I'm running the Falken Ziex 512 in 235/45 on stock rims. Happy for now.
#23
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Originally Posted by mrsteve
The pole posistions are extremely soft and will not last very long at all (think 15,000 miles). However they are supposed to be amazing in the corners.
I'm running the Falken Ziex 512 in 235/45 on stock rims. Happy for now.
I'm running the Falken Ziex 512 in 235/45 on stock rims. Happy for now.
![Big Grin](https://acurazine.com/forums/images/smilies/biggrin.gif)
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Ratio Comparison
I have always thought that 5th gear on the 6MT was kind of useless... I often shift from 4th to 6th. Graphing the ratios explains why...
It also explains why the 5AT is such a dog in 4th...
It also explains why the 5AT is such a dog in 4th...
![](http://i11.photobucket.com/albums/a167/Goredcar/6MT-5ATratios.jpg)
#26
2014 TL SH-AWD Advance
The wind resistance after 150 mph becomes exponential and your HP's must increase almost exponential to get anywhere near a speed like that. Just watched a video on the Bugatti Veyron. 1001 HP. The guy narrating said it only used 250 of the available HP to get it to 150 MPH, however, it took the other 750 ponies to get to 240 mph. wind resistance is the main reason most street cars won't go over 150.
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