kyanther
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| posted on 10/5/07 at 11:43 PM |
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which diff?
trying to work out which diff to use can anyone help please ?!!!!!
gathering parts for 650kg locost 207 bhp max 6500 rev 210 torque @4250 T5 gearbox
ratios:
2.915
1.932
1.323
1
0.8
im thinking 3.64 as in donor, 3.14 sierra, or freelander 3.2 but open to views, ive got all this info and not a clue what it means in driving
experience. not bothered on top end i want acceleration but dont want to be changing gears umptine times to get to 60!!!! any help!!!
3.14 diff
Gear Mph per 1000 RPM Mph @4250 RPM Mph @6000 RPM
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1 7.62 32 46
2 11.49 49 69
3 16.79 71 101
4 22.21 94 133
5 27.76 118 167
Mph RPM (in Gears)
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1 2 3 4 5
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5 656 435 298 225 180
10 1313 870 596 450 360
15 1969 1305 894 675 540
20 2625 1740 1191 901 720
25 3281 2175 1489 1126 901
30 3938 2610 1787 1351 1081
35 4594 3045 2085 1576 1261
40 5250 3480 2383 1801 1441
45 5907 3915 2681 2026 1621
50 4350 2979 2251 1801
55 4785 3276 2477 1981
60 5220 3574 2702 2161
65 5655 3872 2927 2341
70 4170 3152 2522
75 4468 3377 2702
80 4766 3602 2882
85 5064 3827 3062
90 5362 4053 3242
95 5659 4278 3422
100 5957 4503 3602
105 4728 3782
110 4953 3962
115 5178 4143
120 5403 4323
125 5629 4503
130 5854 4683
135 4863
140 5043
145 5223
150 5403
155 5584
160 5764
165 5944
Gear Change RPM drop (change @4250) RPM drop (change @6000)
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1 -> 2 -1433 (to 2817) -2023 (to 3977)
2 -> 3 -1340 (to 2910) -1891 (to 4109)
3 -> 4 -1038 (to 3212) -1465 (to 4535)
4 -> 5 -850 (to 3400) -1200 (to 4800)
3.2 freelander
Gear Mph per 1000 RPM Mph @4250 RPM Mph @6000 RPM
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1 7.48 32 45
2 11.28 48 68
3 16.47 70 99
4 21.79 93 131
5 27.24 116 163
Mph RPM (in Gears)
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1 2 3 4 5
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5 669 443 304 229 184
10 1338 887 607 459 367
15 2006 1330 911 688 551
20 2675 1773 1214 918 734
25 3344 2216 1518 1147 918
30 4013 2660 1821 1377 1101
35 4682 3103 2125 1606 1285
40 5351 3546 2428 1836 1468
45 3990 2732 2065 1652
50 4433 3036 2294 1836
55 4876 3339 2524 2019
60 5319 3643 2753 2203
65 5763 3946 2983 2386
70 4250 3212 2570
75 4553 3442 2753
80 4857 3671 2937
85 5160 3901 3120
90 5464 4130 3304
95 5768 4359 3488
100 4589 3671
105 4818 3855
110 5048 4038
115 5277 4222
120 5507 4405
125 5736 4589
130 5966 4772
135 4956
140 5140
145 5323
150 5507
155 5690
160 5874
Gear Change RPM drop (change @4250) RPM drop (change @6000)
-------------------------------------------------------------
1 -> 2 -1433 (to 2817) -2023 (to 3977)
2 -> 3 -1340 (to 2910) -1891 (to 4109)
3 -> 4 -1038 (to 3212) -1465 (to 4535)
4 -> 5 -850 (to 3400) -1200 (to 4800)
3.64 in donor car
Gear Mph per 1000 RPM Mph @4250 RPM Mph @6000 RPM
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1 6.57 28 39
2 9.92 42 59
3 14.48 62 87
4 19.16 81 115
5 23.95 102 144
Mph RPM (in Gears)
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1 2 3 4 5
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5 761 504 345 261 209
10 1522 1008 691 522 418
15 2282 1513 1036 783 626
20 3043 2017 1381 1044 835
25 3804 2521 1726 1305 1044
30 4565 3025 2072 1566 1253
35 5326 3530 2417 1827 1462
40 4034 2762 2088 1670
45 4538 3108 2349 1879
50 5042 3453 2610 2088
55 5547 3798 2871 2297
60 4144 3132 2506
65 4489 3393 2714
70 4834 3654 2923
75 5179 3915 3132
80 5525 4176 3341
85 5870 4437 3549
90 4698 3758
95 4959 3967
100 5220 4176
105 5481 4385
110 5742 4593
115 4802
120 5011
125 5220
130 5429
135 5637
140 5846
Gear Change RPM drop (change @4250) RPM drop (change @6000)
-------------------------------------------------------------
1 -> 2 -1433 (to 2817) -2023 (to 3977)
2 -> 3 -1340 (to 2910) -1891 (to 4109)
3 -> 4 -1038 (to 3212) -1465 (to 4535)
4 -> 5 -850 (to 3400) -1200 (to 4800)
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kyanther
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| posted on 10/5/07 at 11:47 PM |
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sorry cut and paste not worked well!!! think you get jist though!!!!
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Schrodinger
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| posted on 11/5/07 at 08:01 AM |
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If you want acceleration and are not worried about top speed then use the highest ratio diff you can find, IIRC there is a 3.92 diff in some form of
Sierra.
This will still give you a top speed enough to loose you licence
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smart51
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| posted on 11/5/07 at 08:39 AM |
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Freelander diffs are more common than sierra 3.14s and are probably cheaper too, and lighter.
The donor diff gives 39 and 59 in 1st and 2nd. Would this annoy you, having to shift before hitting round numbers on the speedo? It would ruin your
0-60 times by having a 2nd - 3rd shift at 59 MPH. If it doesn't trouble you, stick with the donor diff.
3.1 and 3.2 diffs have worse acceleration in each ger than a 3.6. They have more top speed in each gear though. For acceleration off the line and
wheelspin ability, find a higher numbered diff. For top speed fit a lower numbered diff. for best 0-62 time, you want a 1.54 diff ideally.
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