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Registered
Join Date: Dec 2000
Location: ON, Canada
Posts: 886
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Ideal gear ratios?
Working out gear ratio options before I reassemble my gearbox(es). I have a revvy 2056cc and would like to achieve the most fun in town, plus have the atallest fifth. Below are the gearsets for the 914/4 and /6 and the speed (in km - 50km=30MPH, 100kmh=60MPH) at a given RPM in each gear.
The differences small to me, however they were big enough for Porsche to make the change. I was thinking that the A, GA, N, O, ZD would be fun. Basically it is like a 914/4 but with a taller second which would be closer to third. Second tops out at about 55 mph. Anyone ever done this or have any opinions? TIA! Dave Gear ratio table is here as below did not format well. http://www.syer.net/gearbox_rebuild.htm Gear Gear 1 2 (4) 2(6) 3(4) 3(6) 4 5(6) 5(4) Ratio 3.091 1.889 1.778 1.261 1.217 0.9259 0.7586 0.7097 Letter A F GA N O V ZA ZD RPM 1000 8 14 15 21 21 28 34 37 1500 13 21 22 31 32 42 51 55 2000 17 27 29 41 43 56 68 73 2500 21 34 36 51 53 70 86 91 3000 25 41 44 62 64 84 103 110 3500 29 48 51 72 75 98 120 128 4000 34 55 58 82 85 112 137 146 4500 38 62 66 93 96 126 154 165 5000 42 69 73 103 107 140 171 183 5500 46 76 80 113 117 154 188 201 6000 50 82 88 123 128 168 205 219 6500 55 89 95 134 139 182 222 238 7000 59 96 102 144 149 196 239 256
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-- Dave '73 914, 2056 GT/SC done! '69 Lotus Europa S2 - under resto. pics at http://www.syer.net Last edited by DDS; 05-24-2004 at 06:09 PM.. |
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05-24-2004, 05:56 PM
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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,700
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I was curious, if you aready had the gears or not? If not can you get them at a reasonable price since they are getting veeeeerrrrrry expensive now. I have a box with a limited slip and M-S-X upper gear set and it is pretty valuable now. I had a new box built for the six since the X was too high and went with K-Q-V for the upper three gears and they were lots of $$$$. For the big four, the higher four will be great for street since they are torquier than a six usually. Good luck
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05-24-2004, 07:13 PM
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Registered
Join Date: Dec 2000
Location: ON, Canada
Posts: 886
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The box that came with my car was a 914/01 with LSD - the stock 914/6 box, so lucky me I got a nice diff and three different ratios to play with. I have several stock 914/4 boxes. You know, I haven't checked the stampings on the gears, I just assumed that they would be the stock 914/6 set as described here :
http://members.rennlist.com/chuxter/901&915ratios.htm the six set would be A, GA, O, V, ZA the four set would be A, F, N V, ZD I'll double check which gears I have as the car was tracked in California before being returned to Canada. Who know what's in there! Compared with what you're doing with that zoomy race car, it really looks like any changes I make will be minor - the spread between the options I have isn't huge. What do you think that stock 914/6 box is worth? Maybe I'll sell it or just its case! Dave
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-- Dave '73 914, 2056 GT/SC done! '69 Lotus Europa S2 - under resto. pics at http://www.syer.net |
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05-24-2004, 07:36 PM
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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,760
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I had a T for 4th slipped in between a flipped 5th for 3rd and a Y for 4th. If you can find another stock 5th, you could change the deltas for cheap and have a close ratio trans with a criusing gear.
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05-27-2004, 07:26 PM
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