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Discussion Starter #1
Can someone having Q post their engine rpms at corresponding speeds?? I wanna compare with mine, I know its higher geared than L tranny, but would like to see some comparison numbers.... speed vs rpms

thanks,
-Pavan.
 

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Can someone having Q post their engine rpms at corresponding speeds?? I wanna compare with mine, I know its higher geared than L tranny, but would like to see some comparison numbers.... speed vs rpms

thanks,
-Pavan.
164Q axle ratio 17/58 3.412 so .916 overdrive in 5th overall ratio in 5th 3.125 23.03 mph @ 1000 RPM. So in 4th 18.24 mph @ 1000 rpm
164LS axle ratio 17/57 3.353 still .916 OD in 5th but overall ratio in 5th 3.071 so 23.43 mph in 5th. So in 4th 18.56 mph @ 1000 rpm.

164S 3.412 17/58 overall ratio in 5th 3.125 and same 23.03 mph in 5th @ 1000 rpm

164B/L 3.111 18/56 overall ratio in 5th 2.849 so 25.62 mph in 5th @1000 rpm
 

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hm... didn't realize the Q and LS ratios were so close. Thought it would be more like the B/L is to the S.
 

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Discussion Starter #4
164Q axle ratio 17/58 3.412 so .916 overdrive in 5th overall ratio in 5th 3.125 23.03 mph @ 1000 RPM. So in 4th 18.24 mph @ 1000 rpm
164LS axle ratio 17/57 3.353 still .916 OD in 5th but overall ratio in 5th 3.071 so 23.43 mph in 5th. So in 4th 18.56 mph @ 1000 rpm.

164S 3.412 17/58 overall ratio in 5th 3.125 and same 23.03 mph in 5th @ 1000 rpm

164B/L 3.111 18/56 overall ratio in 5th 2.849 so 25.62 mph in 5th @1000 rpm
THanks Steve, tht gives me some idea... so there should be a lot of difference comparing L with Q, tht explains in my case. I would also like for someone to post the rpms at all other speeds like at 30mph, 65mph and one at 90mph. I will post mine later today if I got to drive it, as I am driving my L this week

-Pavan.

-Pavan.
 

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Here is a spreadsheet that will allow you to calculate speed in the various gears. You will need to input ring and pinion, overall tire diameter, and the indiviual gear ratios. Hope this helps.
 

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Discussion Starter #6
Here is a spreadsheet that will allow you to calculate speed in the various gears. You will need to input ring and pinion, overall tire diameter, and the indiviual gear ratios. Hope this helps.
Nice spredsheet, but where can I get the value for R&P??

Anybody have tht value??

-Pavan.
 

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Nice spredsheet, but where can I get the value for R&P??

Anybody have tht value??

-Pavan.
I gave it in above post for each car. It is small number (pinion)/ large number (ring)

So 164Q is 17/58 so 3.412 ratio goes into R&P column in spreadsheet/ Looks like first entry is for a 4.10 ratio.

Andy how are you doing the math in spreadsheet? I am missing something in translation.
 

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Discussion Starter #9 (Edited)
Here is what I got using tht spreadsheet...

R & P Tire Size ( over all dia in.)
3.412 25

3.5 2.176 1.523 1.156 0.916 0.65
RPM 1st 2nd 3rd 4th 5th 6th
1000 6.23 10.02 14.31 18.86 23.80 33.54
1250 7.79 12.52 17.89 23.57 29.75 41.92
1500 9.34 15.03 21.47 28.28 35.70 50.30
1750 10.90 17.53 25.05 33.00 41.64 58.69
2000 12.46 20.03 28.63 37.71 47.59 67.07
2250 14.01 22.54 32.20 42.43 53.54 75.45
2500 15.57 25.04 35.78 47.14 59.49 83.84
2750 17.13 27.55 39.36 51.86 65.44 92.22
3000 18.68 30.05 42.94 56.57 71.39 100.61
3250 20.24 32.56 46.52 61.28 77.34 108.99
3500 21.80 35.06 50.09 66.00 83.29 117.37
3750 23.36 37.57 53.67 70.71 89.24 125.76
4000 24.91 40.07 57.25 75.43 95.19 134.14
4250 26.47 42.57 60.83 80.14 101.14 142.53
4500 28.03 45.08 64.41 84.85 107.09 150.91
4750 29.58 47.58 67.98 89.57 113.04 159.29
5000 31.14 50.09 71.56 94.28 118.99 167.68
5250 32.70 52.59 75.14 99.00 124.93 176.06
5500 34.25 55.10 78.72 103.71 130.88 184.45
5750 35.81 57.60 82.30 108.42 136.83 192.83
6000 37.37 60.10 85.88 113.14 142.78 201.21
6250 38.93 62.61 89.45 117.85 148.73 209.60
6500 40.48 65.11 93.03 122.57 154.68 217.98
6750 42.04 67.62 96.61 127.28 160.63 226.36
7000 43.60 70.12 100.19 132.00 166.58 234.75
7250 45.15 72.63 103.77 136.71 172.53 243.13
7500 46.71 75.13 107.34 141.42 178.48 251.52
7750 48.27 77.64 110.92 146.14 184.43 259.90
8000 49.82 80.14 114.50 150.85 190.38 268.28

just ignore the 6th gear...

-Pavan
 

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Here is what I got using tht spreadsheet...

R & P Tire Size ( over all dia inches)
3.412 15

just ignore the 6th gear... does the rest of the data looks right??

-Pavan
Math maybe correct but tire diameter needs to be for tire diamter of specfic size 15" tire you are using. The stock 195-65-15 tire that came with most USA 164 models has diameter of 25".

You need to know diameter of size tire you are using.
 

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There is a location in the spreadsheet to insert tire diameter. The math is correct, as I have been using this spreadsheet for years. The 6th gear section was added to calculate speeds for a 156 6 speeds we are working with.
 

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There is a location in the spreadsheet to insert tire diameter. The math is correct, as I have been using this spreadsheet for years. The 6th gear section was added to calculate speeds for a 156 6 speeds we are working with.
But you have to use tire diameter such as 25" for 195-65-15 tire not 15" right?
 

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Discussion Starter #13
But you have to use tire diameter such as 25" for 195-65-15 tire not 15" right?
Having 6th gear looks really fun.... I should consider installing a 6spd :p. Anyway I am sure my rpms are higher than these at corresponding speeds shown in the chart.
-Pavan
 

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You need to enter overall tire diameter not tire size. On my spreadsheet it is cell I2.

My reason for wanting a 6 speed is for good acceleration in the lower gears and lower RPM's while cruising. The S has a 3.412 r & p, which means on trips cruising @ 85-95 mph you are turning lots of rpm. The 6 speeds have tighter gear placement and still lower RPM. Another plus of the 156 6 speeds is the availably of quaife lsd units. The 164 really needs more traction, especially in the wet and when aggressively driving the car.
 

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Can someone having Q post their engine rpms at corresponding speeds?? I wanna compare with mine, I know its higher geared than L tranny, but would like to see some comparison numbers.... speed vs rpms

thanks,
-Pavan.
Today 60mph = 2600rpm 80mph =3400rpm
215/45-17
I hope that helps! Believe it or not, but I was actually flowing with traffic not overtaking anyone :eek:. Wife will jump on me for speeding while she is in car :p.
 

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164Q Speeds and RPM's

My 164Q with 195-65R-15 Michelin WMXr all weather tires turns about 2.5k at 60 MPH and about 3K at 70 MPH. These are not by any means "performance" tires! Wish it had a six speed!
 

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The one aspect this speed spreadsheet can not take into account is actual achievable RPM and the wind resistance. At some point the car will not have enough power to overcome the wind resistance. The spreadsheet really works well for look at the effects of tire size and gear ratio changes.
 

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Thank you for posting this chart. I imported it into MS Word and set up a nice chart for reference. I didn't realize that I was going as fast as I thought I was. :eek:

Is there a web source for tire size?
 
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