RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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What about the BMW diff in the rear subframe from an a4 quattro? They appear to have a very compact twin wishbone set-up out back, although you'd need to modify the arms to equal length it'd be a lot easier than starting from scratch. This is what a google shows the rear suspension as, although I don't know if this is used on the B5's or just the B6's onwards: /S6%20Sedan%20(C5)/Technical/007.jpg) |
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,790
Club RR Member Number: 34
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thats the kind of setup I'm thinking of robin.
i don't think the live ale idea is a total write-off yet though. ive just taken some measurements.
all from axle tube centreline to upmost extremity of diff casing.
ford 9"=5-1/2"
scimitar 4ha=5-1/4"
chevy 10-bolt=5-1/4"
ford english=4-3/8"
as you can see, the english is basically an inch smaller than any of the others.
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Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
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Jun 30, 2011 10:19:50 GMT
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Just another idea - it's not a live axle, but ISTR that the ratio on the Mercedes W126 500SE diff (that I sold to Benzboy) was 2.24:1 Not sure what my spare Chevy Blazer axle ratio is, but I reckon that might be a tad large  |
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Suzuki GSXR1000 K2
BMW R1150GS
BMW K1200RS
Chevy K5 Blazer
Chevy Suburban LT
Jaguar XKR
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Jun 30, 2011 10:32:00 GMT
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If you lived in Australia then there's a whole range of Borg Warner live axles as used in various Aussie-built cars throughout the decades, all the way into the new millenium!
A lot of 1980s Ford Falcons with the 5.8 litre/351ci V8 had 2.77:1 rear axles. Holden V8s had ratios as low as 2.60:1 in Salisbury rear axles for years. Both were available with factory LSD.
Perhaps you might score something similar out of a late model Mustang if someone is breaking one?
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craig1010cc
Club Retro Rides Member
Posts: 2,998
Club RR Member Number: 35
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Jun 30, 2011 11:43:17 GMT
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Is there no way to put an overdrive onto the auto box to drop the ratio that way and then your not constrained by the diff's ratio?
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Jun 30, 2011 14:36:56 GMT
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an overdrive onto the auto box Volvo 2/7/9 series autobox? |
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Jun 30, 2011 15:53:40 GMT
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The ford 7.5" has some tall ratios available, and its cheap, can be had in ford 4 stud pattern, can take over 200bhp and its quite light (for its size and stregth anyway) about the same size as a mk4 cortina axle, bit bigger maybe. www.iwerearendsonly.com/products.php?DC=FORD+7.5+REAR |
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Jun 30, 2011 16:22:18 GMT
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Thanks for all the suggestions guys. It seems that even the smallest live axle won't really get the result Dez & I are after (diff casing > floor interface problems)
The current thinking is something like one of our original 'back-up plan' ideas along the lines of what Robin has suggested. BMW diff (around 2.7:1) but mounted into something like an MX5 subframe/driveshafts then make slightly longer upper arms to reduce the amount of camber which will otherwise occur.
The MX5 subframe is pretty easy to source, easy to adapt and if the BMW diff fits, will pretty much address all the issues we've been encountering.
Fingers crossed, it might just be a plan (albeit a slightly leftfield one) that actually works ;D
Thanks again guys.
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Tim
Posted a lot
Posts: 3,340
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Jun 30, 2011 20:39:19 GMT
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Very intrigued by this :-)
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Jun 30, 2011 22:15:43 GMT
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Very intrigued by this :-) Yes. |
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Jun 30, 2011 22:22:20 GMT
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Yes. I have a theory, and I'm going to try and find out if I'm right at the weekend.
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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10mpg
Club Retro Rides Member
Posts: 4,253
Club RR Member Number: 204
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Jun 30, 2011 22:54:42 GMT
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Would an XR 4x4 rear subframe not work? nice and flat and comes with LSD I think the sierra diesel came with a silly tall ratio  |
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Last Edit: Jun 30, 2011 22:59:06 GMT by 10mpg
The Internet, like all tools, if used improperly, can make a complete bo**cks of even the simplest jobs...
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Jun 30, 2011 22:55:04 GMT
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I almost mentioned MX-5 subframes actually, but I figured you wouldn't need telling about them, haha. Remember that to truly get rid of the camber increase you'd need to run the wishbones parallel, not just equal length.
Edit, 10mpg, semi-trailing arms would mean wild camber and toe changes through the travel.
Although I guess if you're altering a double wishbone set-up, then another option would be to use something like that sierra frame, (or even a bmw compact subframe) and alter the arms from semi-trailing arm to trailing arms, so you don't get the camber change. Although you might find the wheels position moving fore and aft, but if this if for the vehicle I think it's for then I don't think that'd be too noticeable. In fact a Trailing arm set-up using sierra hubs, diff and drive-shafts would be pretty easy to knock up from scratch.
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Last Edit: Jun 30, 2011 22:59:47 GMT by RobinJI
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10mpg
Club Retro Rides Member
Posts: 4,253
Club RR Member Number: 204
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I assuming this is gonna be fairly low, given that clearance is an issue, so what does it matter if the camber and toe change drastically over a large deflection if the usable (i.e. whilst driving) travels only a few cm anyway?
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The Internet, like all tools, if used improperly, can make a complete bo**cks of even the simplest jobs...
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Just had a look at my spare Opel Manta axle, bit hard to measure where it is but its around 4 1/2" from centre to top. Most common ratio is the longest at 3.44to1 from the Gt/e versions But the axle does have a torque tube setup on front. Just thought i'd add the info for you  |
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I assuming this is gonna be fairly low, given that clearance is an issue, so what does it matter if the camber and toe change drastically over a large deflection if the usable (i.e. whilst driving) travels only a few cm anyway? excatly. and as i've already pointed out, sloting the trailing arm mounts will bring the camber and toe angles back to a good angle www.e30tech.com/ |
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Hi Bruce, How about a Toyota T series? 6.7" ring gear - so not a huge casing. Usually quite short ratios in Celica and Corollas....but the one used in the AE95 AWD is documented as a 2.92 Any good? If you do find one in a scrappy check the VIN plate says T462 on the transmission code - this defines it as: T series 2.92:1 2 pinion open This axle is 1325mm wide (drum face to drum face) The info I have is for JDM AE95 4WD's so the diff ratio may be different on UK ones, so ensure it is a T462.   |
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,790
Club RR Member Number: 34
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Very intrigued by this :-) Yes. they don't call him 'mystery machine' for nothin'  |
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