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ddgonzal
Re: Am I dreaming. 5 speed box to A15
#105
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Sounds like a great idea. But what kind of expoy is used?

Posted on: 2012/2/9 5:58
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D
Re: Am I dreaming. 5 speed box to A15
#104
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Quote:
I have two racing Toyota T50 gearboxes with custom dog engagement gears. 5-speed with 4th gear 1:1. They are stupidly expensive (about $4000 usd each used). Each gear can be changed. Right now they are set up as 5 speed overdrive close ratios. [5th can also be changed to a lower than 1st gear "pit gear"] No bellhousings, but complete with shifter, tailhousing. These use the later mainshafts modified to run on roller bearings. Speedo has been blocked off. To make an A-series bellhousing, we cut off an A-series front case, fill it with epoxy, and machine it flat. Then bolt it to the T50, still using the A-series throwout arm. Peter Email: PeterZekert (at) Juno (dot) com



Hello D and G

durafix and epoxy looks like a good choice to me again!!
looking at those who have done it for years of racing abuse
Does anyone stand corrected??? :)

Posted on: 2012/2/9 5:44
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D
Re: Am I dreaming. 5 speed box to A15
#103
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Could also use some alloy curved flat plates to strengthen.

Now to find some 60 series bellhousings or just use auto ones.

Posted on: 2012/1/5 3:10
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Re: Am I dreaming. 5 speed box to A15
#102
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i wouldnt see how peening would be any benefit on a gear box housing. i know it adds stength to the join and surrounding areas, but the pre heating welding and cooling process would do similar..... think of that cryogenix freezing they do for similar hardening john.

if it adds strength do it but as you said, thinner alloy, more likely to add stress cracks.

wos going to learn how to sand cast?

Posted on: 2012/1/4 12:18
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jmac
Re: Am I dreaming. 5 speed box to A15
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hey simon - I don't have specific experience with this as far as gearboxes go, but I have seen (I wasn't the one doing the welding, but I did see it done) heads that were badly cracked (and worth the hassle of trying to fix) and warped, heated and slowly straightened, then die grinded the cracks open, pre-heated the whole lot, welded the gaps, then 'peened' the living S#|7 out of it.. Obviously i understand 'why' that would be done, to compact/make dense the welded area and help to prevent/address any new cracks from too high a tension from starting. But this is something where there's a LOT of alloy it is being welded/mended/added to, so it is far more dense, and the peening won't 'hurt' the other parts. But with a gearbox, it's thinner all round, so I wonder if peening it would actually _cause_ new cracks to start (possibly unseen, until they grow/travel when in the car and in use). Any insight you could offer there?

Posted on: 2012/1/4 9:30
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D
Re: Am I dreaming. 5 speed box to A15
#100
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One thing I did find if any use to anyone out there thinking
of doing a toyota w setup was the "A" auto bell is exactly
same depth as the W series toyota box and I mean right on.
Prob is W series boxes are just as rare now as the T series
and gearing is not suitable in the aftermarket chinese ones.

Posted on: 2012/1/4 0:55
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D
Re: Am I dreaming. 5 speed box to A15
#99
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Quote:
First gear is too steep for an A15 but not for and SR20DET --how do you figure? Even the mighty 5-liter uses a 3.35 first gear. Steeper the gear, the more acceleration.

The box it came from s15 are heavier cars and with the sr need better gearing for take off. Put it into a 1200 then
the first gear is overkill due to the weight.
2.9 is perfect for first with a powerful engine in a 1200.

Quote:
If you prefer lower first, just just fit a lower diff. The 6-speed is still closer ratio than the Z box.
yes but geared for a heavy car and first gear is still not decent.

Quote:
Lighter too. Smaller too. And since the SR boys need a stronger box, they are relatively available.

71B is lighter usually while C series are heavier but
6 speed is surely a little heavier than the C boxes.

Sorry for any confusion but was comparing 71b 260z box
vs 6 speed ratio box in terms of first gear ratio.
When you have tried the 2.9 first then you will see how
beautiful it is to accelerate away without quickly going
to the second gear. Its just a good setup and when I had
my 260z it just pulled away from traffic with ease with
the L28 just the factory SUS, extractors and higher comp.

Id love a 2.6 first with the rest of complimenting ratios
to suit that first but too expensive for a 60 series.

Posted on: 2012/1/2 23:06

Edited by D on 2012/1/4 0:55:04
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ddgonzal
Re: Am I dreaming. 5 speed box to A15
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I don't know where the piccy came from ?

S15 box is still better than 63A -- closer ratios, higher first gear, and longer overdrive.

But for these conversions, why not use an A-series automatic bellhousing? Then no 'good' A transmissions are cut up.

Posted on: 2012/1/2 22:33
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A14force
Re: Am I dreaming. 5 speed box to A15
#97
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Quote:

ddgonzal wrote:Silva S15 6-speed gearbox modified for use with A12 engine
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Was that 6 speed pic Gelnn's DD?
The hydro 63A Belhousing would lend it'self more to such a conversion as it would have a bigger base footprint than the 56 and 60. Although if one had an illusive 63a you'd just rejig a stumpy L series box to take it.

Posted on: 2012/1/2 22:21
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ddgonzal
Re: Am I dreaming. 5 speed box to A15
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First gear is too steep for an A15 but not for and SR20DET --how do you figure? Even the mighty 5-liter uses a 3.35 first gear. Steeper the gear, the more acceleration.

If you prefer lower first, just just fit a lower diff. The 6-speed is still closer ratio than the Z box. Lighter too. Smaller too. And since the SR boys need a stronger box, they are relatively available.

Posted on: 2012/1/2 19:05
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