Re-geared 930 on e bay

[Russ Noble]

Ron, do you know anyone looking for the ideal 930 to put in their race only T70?

eBay Motors: Porsche Racing 930 Transmission 935 RS RSR 911 934 (item 260078941604 end time Feb-01-07 10:05:26 PST)

Cheers

 

[Sandy]

Looks like a good box, just depends on how much work it might need. Does have the Quaife and the lower final drive gear (4.85 vs stock 4.22).

I think I looked at changing the final drive ratio and I think it makes the gears short, but getting the R&P is harder then gears.

Will see how much it goes for...

Sandy

 

[Russ Noble]

Looks like a good box, just depends on how much work it might need. Does have the Quaife and the lower final drive gear (4.85 vs stock 4.22).

I think I looked at changing the final drive ratio and I think it makes the gears short, but getting the R&P is harder then gears.

Will see how much it goes for...

Sandy

Hi Sandy, 75 mph first gear and 168 4th doesn't seem all that "short" to me (at 6800) Depending on the length of the straights of course but I would think that gearing would be ideal. As a road box 1st is too high and 4th is too low but no-one is going to buy this one for the road.

Cheers

 

[Sandy]

Russ -

Your right, I ASSumed that it was stock gears and didn't read it all, the 2.25 first is to low with the 4.87 rear, but fine with the 1.44. That must have cost someone a good amount of $$ for the 4 speed re-gears and the r&p. Here is the charts for 26" tires. The gearbox ends up being very nicely geared and at least has LSD which none of mine did.

The stock box ratios are like this

STOCK
4.22 Final
2.25 1
1.30 2
0.89 3 (my box has a 1.0)
0.63 4 (my box has a 0.83)

Gear Mph per 1000 RPM Mph @6800 RPM
------------------------------------------
1 8.15 55
2 14.10 96
3 20.59 140
4 29.09 198

Mph RPM (in Gears)
----------------------------------------
1 2 3 4
----------------------------------------
5 614 355 243 172
10 1228 709 486 344
15 1841 1064 728 516
20 2455 1418 971 687
25 3069 1773 1214 859
30 3683 2128 1457 1031
35 4296 2482 1699 1203
40 4910 2837 1942 1375
45 5524 3192 2185 1547
50 6138 3546 2428 1719
55 6751 3901 2671 1890
60 4255 2913 2062
65 4610 3156 2234
70 4965 3399 2406
75 5319 3642 2578
80 5674 3884 2750
85 6029 4127 2922
90 6383 4370 3093
95 6738 4613 3265
100 4856 3437
105 5098 3609
110 5341 3781
115 5584 3953
120 5827 4125
125 6070 4296
130 6312 4468
135 6555 4640
140 6798 4812
145 4984
150 5156
155 5328
160 5499
165 5671
170 5843
175 6015
180 6187
185 6359
190 6531
195 6702

Gear Change RPM drop (change @6800)
---------------------------------------
1 -> 2 -2871 (to 3929)
2 -> 3 -2145 (to 4655)
3 -> 4 -1987 (to 4813)




Box For Sale -

4.875 Final
1.44 1
1.07 2
0.83 3
0.65 4

Gear Mph per 1000 RPM Mph @6800 RPM
---------------------------------------
1 11.02 75
2 14.83 101
3 19.12 130
4 24.41 166

Mph RPM (in Gears)
----------------------------------------
1 2 3 4
----------------------------------------
5 454 337 262 205
10 908 674 523 410
15 1361 1012 785 615
20 1815 1349 1046 819
25 2269 1686 1308 1024
30 2723 2023 1569 1229
35 3177 2360 1831 1434
40 3630 2698 2092 1639
45 4084 3035 2354 1844
50 4538 3372 2616 2048
55 4992 3709 2877 2253
60 5445 4046 3139 2458
65 5899 4383 3400 2663
70 6353 4721 3662 2868
75 5058 3923 3073
80 5395 4185 3277
85 5732 4447 3482
90 6069 4708 3687
95 6407 4970 3892
100 6744 5231 4097
105 5493 4302
110 5754 4506
115 6016 4711
120 6277 4916
125 6539 5121
130 5326
135 5531
140 5735
145 5940
150 6145
155 6350
160 6555
165 6760

Gear Change RPM drop (change @6800)
-------------------------------------------------------------
1 -> 2 -1747 (to 5053)
2 -> 3 -1525 (to 5275)
3 -> 4 -1475 (to 5325)

 

[Ron Earp]

Kind of funny, but the one I bought on Ebay is set up almost exactly the same. From Karl Hens in PA that does transaxle work, it has the shorter R&P and the ZF LSD. Has a different 3rd and 4th if I recall, I'll get the sheet on it. I did some calculations with a spread sheet and it worked out to about what Sandy wrote. I'll check it. I haven't mounted it on the engine or anything like that, need to measure the pilot and see if it is completely different than what I have in the crank, I imagine it is.

I got mine for $3600 but it had no starter and no cryo treatment on the gears etc, but it is wired and looks like new inside with a LSD that was just gone through.

R

 

[Russ Noble]

Looks like it has gone early. No longer available for sale. Must have been sold off-auction. Wonder what he got for it?

Not sure why he went to the trouble of changing the r&p though coz you can get the same overall gearing just by changing the gears and they are available in suitable ratios. They are nearly identical to what I had tentatively planned for mine after the first season. Also the 8:39 r&p (smaller pinion) is not going to be as strong as the original 9:38 IMHO.

Cheers

 

[Sandy]

I think Ron got a smoking deal from what you sound like you paid for it. I'm in for a lot more just for mind to get them going. I don't know about the R&P strength but as I understand one of the gear sets were made in Italy and the gears are not as good as the factory (what I was told). I would also agree, if you are going to change all the gears why bother with the R&P unless done after the fact.

Sandy