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what gearbox (race 901?)
I have a 1969/70 2,2S type 911534
chassisnumber: 9110300328
The gearbox has a long first and then the gears are like on a motorcycle, very close stacked. Fifth is short about 60 mph @ 4000 rpm. It has first down to the left as a normal 901. The number on the box is 7798766. Can anyone here identify the gearbox? It seems likely that it is some sort of a race gearbox, maybe from a S/T?
And the engine is the original but lacks numbers on the fan, goes like stink...after 4000 rpm it just takes off and goes with anger to 8000 rpm but I close down before 7300 rpm:D I think maybe the car have some sort of race history. Does anyone recognize the vin?
Best regards,
Christer
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your numbers throw me off a bit:
9110300328= a 1970 911 S
911534? might be on the block as 911/53 or 911/54 for a 72-73 S engine
7798766?? turbo trans but not a 901 shift pattern??
you sure its not 7198766?? this is a 901 for 69-70 S and E cars.
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Thanks for the answer.
I send my chassis number to Porsche Norway and got this info:
Chassis number 9110300328 belongs to:
type 911534=911S Coupe 2,2l 180hp / Motor 6300505 / delivered 01.Dec.`69 to Grand Rapids / Color 2323=bloodorange / Interior 11=leatherette black,middle of seats basketweave / Options 453=Radio Blaupunkt Frankfurt , 470=comfort-equipment
So far so good. That is my car all right. Color and interior is right. But the info says nothing about the gearbox and my friends 69 T has much higher ratio than me. Maybe the box is the original, but then those old 911s boxes were really low geared. How can i know this is a matching # box? And if not, how do one tell it is a race/special box?
You are probably right with the number 7198766. Lots of dust down there and dark too. Then it is a proper S box anyway.
Cheers,
Christer
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Simple; somebody changed the ratios. Not a big deal. If you got a 904 mainshaft in the deal, even better.
Tom
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Thanks Tom,
Then I really do not know what I have until it is dismantled. I have gotten some mails though so I think I will keep the box. Strange how people want to help out with swapping my lousy racebox with original gearboxes to take me out of my misery:D :D
So conclusion is original 901 S 1970 box with race internals maybe a 904 mainshaft.
Thanks all for help!
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2 Attachment(s)
You should be able to estimate gear ratios by turning a rear wheel and watching the fan pulley go around. With the spark plugs out there shouldn't be too much resistance.
If you do not have a limited slip two turns of one rear wheel is the same as one turn of the rear axle. If you do have a limited slip turning both rear wheels at once might be a challenge.
This document has the gear ratios from the spec booklet. Under the attachment rules I can't upload the original Excel spreadsheet--this is tab-delimited text. Open it with Excel (or some other spreadsheet). I hope you can figure it out without the Excel formatting.
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Thanks for helping. I have gotten lots of good advice here and on the swedish early911 forum. One guy suggested that I had the 901/52 Flugplatzrennen -67
100kph @3800rpm
Gearing: 7:31
1 12:34
2 18:34
3 21:31
4 23:28
5 25:26
Do anyone know what that equals out to in mph or km/h @ 4000 rpm on all gears? It is so nice to have this forum with all the knowledge.
Cheers,
Christer
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2 Attachment(s)
I added rows for mph per 1000 rpm to the attachment.
For 4000 rpm, and a 165R15 tire (25.6 inch diameter):
________teeth____ratio_________mph@1000rpm_mph@400 0rpm
1st_____12:34_____2.83____AA_______6.1________24.3
2nd_____18:34_____1.89_____F_______9.1________36.4
3rd_____21:31_____1.48_____J______11.6________46.5
4th_____23:28_____1.22_____Q______14.1________56.4
5th_____25:26_____1.04_____S______16.5________66.1
final
drive____7:31_____4.43
Sorry about the funky underscores but it was the only way to defeat the forum software's auto formatting.
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Thanks Jim,
IŽll be out driving tomorrow and check if the ratios match. If so I have found my box:D
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Scrub off the grime and confirm the type and serial number from the
box itself, that will go a long way to confirming which gearbox you have.
FWIW, the information I have for 911 boxes (i.e. 1970-71 cars) is that
the special ratio boxes are numbered 911/80 special order, 911/81 hill
climbs, 911/82 airfield, 911/83 high speed circuits, & 911/84 Nuerburgring.
andy