Ranger SS

deltaforce
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Re: Ranger SS

Post by deltaforce » Wed 04 May 2016, 08:32

The diff ratio would be the standard Manta diff, which was very high, somewhere around 3.3:1, I dont have the exact figure right now. But 4th gear in the Manta was 1:1 and there is a BeeEm box with a 5th gear of 1:1, thats the one that I am after.

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Can-Am ZN
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Re: Ranger SS

Post by Can-Am ZN » Wed 04 May 2016, 08:39

deltaforce wrote:The diff ratio would be the standard Manta diff, which was very high, somewhere around 3.3:1, I dont have the exact figure right now. But 4th gear in the Manta was 1:1 and there is a BeeEm box with a 5th gear of 1:1, thats the one that I am after.
Ok, thats not that high if you intend using the E36 gearbox (with 1:1 ratio 5th gear), if thats what you have in mind....the E36 3.2 M3 used a 3.23 with the same first 5 ratios.
Gavin

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KSF
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Re: Ranger SS

Post by KSF » Wed 04 May 2016, 14:32

Its probably the "dogleg" Getrag box he is after, was used in the 80's BMW M535i MLE and 190E Mercs. Also the only one that can truly be called "close ratio".

The others, even the M3 boxes were not true close ratio boxes. Most also had overdrive 5th gears.

That dogleg box is now more than ever very scarce and expensive. Also many are by now a bit fragile (high milage) and repairs are similarly very expensive.

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Johann65
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Re: Ranger SS

Post by Johann65 » Wed 04 May 2016, 14:37

Can-Am ZN wrote:
deltaforce wrote:The diff ratio would be the standard Manta diff, which was very high, somewhere around 3.3:1, I dont have the exact figure right now. But 4th gear in the Manta was 1:1 and there is a BeeEm box with a 5th gear of 1:1, thats the one that I am after.
Ok, thats not that high if you intend using the E36 gearbox (with 1:1 ratio 5th gear), if thats what you have in mind....the E36 3.2 M3 used a 3.23 with the same first 5 ratios.
My Opel Rekord is with the 3.27 diff of that time. Very quick on the takeoff! The Ranger had a 4.5 diff as standard. A 5spd box; 1:.08 5th gear would really work with a 3.27 diff!! Higher top end speed!!
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1966 Opel Rekord L CLASSIC SEDAN Current Project

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Can-Am ZN
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Re: Ranger SS

Post by Can-Am ZN » Wed 04 May 2016, 16:49

KSF wrote:Its probably the "dogleg" Getrag box he is after, was used in the 80's BMW M535i MLE and 190E Mercs. Also the only one that can truly be called "close ratio".

The others, even the M3 boxes were not true close ratio boxes. Most also had overdrive 5th gears.

That dogleg box is now more than ever very scarce and expensive. Also many are by now a bit fragile (high milage) and repairs are similarly very expensive.
If that's the case then those are scarce and, as you correctly say, high mileage and costly to refurb.

That wasn't the only close ratio BM box though, the Getrag that was fitted to the homologation 325iS cars were also close ratio...not to be confused with "short ratio".

Those require a diff ratio of 4.00:1 or shorter to extract the best out of them for track racing though..
Gavin

1974 Chev Can-Am 302
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IndianaJones
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Re: Ranger SS

Post by IndianaJones » Wed 04 May 2016, 22:29

Any dogleg, close ratio, 1:1 5th gearbox would be difficult to find.

Especially, since I assume under track racing conditions you would want a 1st gear ratio near the 3.40:1 of your standard gearbox.

I believe the most common 5-speed conversions for the Opel CIH engines and are for road use, make use of the Getrag 240 gearbox, it is an overdrive gearbox with a 3.7:1 first gear, but it had an integrated bellhousing. Thus easier to use one from an Opel, if you are using one from a BMW, it would have to be modified. The Getrag 265(I think was used in the Senator 3.0E) is a much stronger gearbox and has a separate bellhousing. There were 5speeds found in some of our Opel Rekords (I think the 2.0L and 2.2L versions), with the same ratios as the Getrag 240, called the R25, which might be the easiest swap.

BMW guys help me out here, since I say this under correction, but think 4-cylinder BMW E30 3-Series’ make use of the Getrag 240, and 6-cylinder E30’s use the Getrag 260, but all are overdrive boxes. If you make use of an overdrive gearbox, you could probably make use of a lower(numerically higher) diff ratio, to gain better acceleration out of corners.
A lot of the manual E36 & E46 3-Series BMW gearboxes, I think are ZF units and does not have the dog-leg shift pattern, but they do have a 1:1 5th gear, unfortunately they have a much lower(numerically higher) first gear, around 4.2:1.

If it’s specifically a dog-leg shift pattern you are after, consider a Nissan Stanza SSS 5-speed gearbox, they have a 3.382:1 1st gear ratio, but it is an overdrive gearbox.

A left field choice, but perhaps usable if the rules allows and you can have the bellhousing setup modified, also integrated. The 6-speed Aisin gearbox, out of a Mazda RX8 or late MX5, S15 Nissan Silvia, or BEAMS-engined Toyota Altezza, ratios differ slightly, but they generally have a 1st gear ratio around 3.7:1, and a 1:1 5th. Or the 6-speed out of a Honda S2000 3.133:1 1st and very near 1:1 5th, slight overdrive. There are less info available covering these conversions with Opel CIH engines, would probably be more expensive than a normal BMW 3-Series gearbox, but they aren’t hugely expensive at the importers.

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Can-Am ZN
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Re: Ranger SS

Post by Can-Am ZN » Thu 05 May 2016, 08:24

IndianaJones wrote:...BMW guys help me out here, since I say this under correction, but think 4-cylinder BMW E30 3-Series’ make use of the Getrag 240, and 6-cylinder E30’s use the Getrag 260, but all are overdrive boxes. If you make use of an overdrive gearbox, you could probably make use of a lower(numerically higher) diff ratio, to gain better acceleration out of corners.
A lot of the manual E36 & E46 3-Series BMW gearboxes, I think are ZF units and does not have the dog-leg shift pattern, but they do have a 1:1 5th gear, unfortunately they have a much lower(numerically higher) first gear, around 4.2:1...
Yup, the E30 as well as the E36 used a mix of both ZF and Getrag boxes, fitted randomly.

Interestingly, whilst the E30 was equipped with differing gearbox ratios, depending on the engine fitted, the E36 used the same gearbox ratios on all models, irrespective of whether it was a 318i or a 328i...they varied the diff ratios instead.
Gavin

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IndianaJones
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Re: Ranger SS

Post by IndianaJones » Sat 21 May 2016, 16:12

What happened to deltaforce?

Opel R25 5-speed gearbox
http://www.gumtree.co.za/a-car-replacem ... 0330844909
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