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PostPosted: Mon Jun 03, 2013 10:38 am 
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Group N

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Does anyone have any idea how much torque can our entire drive train take before giving out?
I mean "assuming" I have an engine producing a ridicules amount of torque. What what would go first and how much can it take?

Talking about the ST205 btw.
Thanks


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PostPosted: Mon Jun 03, 2013 4:46 pm 
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WRC
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Hi,

i would guess the cluth, and this is good, my seight of things is pretty simple, i preffer a damaged cluth then a transmission

thats why i am not using a cluth which handels 700NM, my target was 500NM and the cluth is able to handle a little more then this 550NM iirc

i would not drive more then 500NM, anywhere here is the boarder line i think

greetz

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PostPosted: Tue Jun 04, 2013 11:27 am 
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Sunny thanks for that info.


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PostPosted: Tue Jun 04, 2013 12:57 pm 
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Group N

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Id say rear diff / clutch would be first to break.

Gearbox / shafts are actually pretty strong..


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PostPosted: Tue Jun 04, 2013 4:27 pm 
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Joined: Wed Jul 13, 2005 12:14 am
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Location: Camberley, Surrey
Car Model: ST205
I know fensport had some recurring problems with selector forks breaking inside the box at high power.

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PostPosted: Tue Jun 04, 2013 4:57 pm 
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I would suspect selector fork problems to be down to banging it through gears quickly rather than power / torque related. It does seem to be a weak point in these gearboxes when animals are driving :lol:

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PostPosted: Tue Jun 04, 2013 5:19 pm 
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Group N

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^^^^^ pmsl he's never going to forget about it :)


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PostPosted: Tue Jun 04, 2013 6:01 pm 
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Did you break one ? I've forgotten.

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PostPosted: Tue Jun 04, 2013 6:52 pm 
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When Adrian ran the Corolla RUNX on the drag strips he used to take spare drive shafts and rear diffs. I recall he broke either a DS or a Torsen rear diff at Santa Pod. The 3S-GTE was putting out around 500bhp. Later on I think he set up the MoTeC launch control to take the strain off the transmission.

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PostPosted: Tue Jun 04, 2013 9:43 pm 
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I thought the selector forks failing were suspected to be an issue caused by the fancy gearbox or selector he was using?

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PostPosted: Wed Jun 05, 2013 12:40 am 
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Location: Perth, Western Australia
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He used three different type of gearboxes in the Gen 7 Celica, OEM followed by Elite and Pfitzner dog boxes. You are right that he had some bespoke steel gear selectors made up for the Elite box after the OEM selectors failed.

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PostPosted: Thu Jun 06, 2013 12:42 pm 
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Group N

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so the forks in the stock gear box. Assuming they mainly break from gear change with huge power rite? What if it was just in 1 gear and a lot of power was put through? The rear diff's the next problem then?


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PostPosted: Thu Jun 06, 2013 4:09 pm 
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The fork breakage is not related directly to power

The issues Adrian had were a side effect of the straight cut gear cluster (and possibly the sequential shifter but I think that came later) used to more effectively deploy said power. I do remember him breaking a couple of diffs and iirc a trip to the dragstrip saw a driveshaft or two in the support vehicle


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PostPosted: Thu Jun 06, 2013 6:42 pm 
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The stress on the selector forks is down to the arm muscles of the driver, not the pony muscles of the engine.

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PostPosted: Fri Jun 07, 2013 11:22 am 
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Group N

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So has anyone ever upgraded the rear diffs then? What options do we have? Is it possible to install a strong ford 9" rear diff? Props and shafts custom made I know.


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