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 Post subject: Toe board strengthening
PostPosted: Mon Apr 26, 2021 11:04 am 
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I've heard of high-powered minis causing cracks in the toe board where the subframe bolts pass through the floor. The solution (or prevention in a new build) seems to be to add a steel spreader plate around those mount points, but is there a good plate area/dimensions and thickness to use? As opposed to complete overkill and welding in a 3mm steel plate across the entire width of the toe board :shock: Any photos would be appreciated too.

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I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


Last edited by Mearcat on Mon Apr 26, 2021 3:34 pm, edited 1 time in total.

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PostPosted: Mon Apr 26, 2021 3:24 pm 
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wow how much are you hating on your mini??

ive sagged them in the middle long before ive had issues with the sub-frame pulling out



to answer your question, an engineer will say dont make it any more that double the metal its attached to, so a 2-2.5 mm would probably be better

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PostPosted: Mon Apr 26, 2021 3:34 pm 
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greyghost wrote:
wow how much are you hating on your mini??

No hate yet, but about 160hp once it's on the road :P This is about forward-planning

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I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


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PostPosted: Mon Apr 26, 2021 8:22 pm 
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I think David Vizards “how to modify your mini” had some recommendations on this.

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PostPosted: Tue Apr 27, 2021 8:53 am 
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Phil 850 wrote:
I think David Vizards “how to modify your mini” had some recommendations on this.

The only stiffening reference in the body work section of the book mentions behind the carb, pushing the bulkhead into the parcel shelf.

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I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


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PostPosted: Tue Apr 27, 2021 10:05 am 
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Mearcat wrote:
Phil 850 wrote:
I think David Vizards “how to modify your mini” had some recommendations on this.

The only stiffening reference in the body work section of the book mentions behind the carb, pushing the bulkhead into the parcel shelf.

Are you looking at the new yellow one or the old white one? The old white one that was specific to minis had a few references for the body & subframe modifications

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PostPosted: Thu Apr 29, 2021 10:59 am 
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Dutchy boxed up the section in his. But I believe it was for suspension and steering mounting purposes. But if you extend that concept further, there could be a solution somewhere:
viewtopic.php?f=23&t=100203&start=75

My thinking is that the torque from the motor would want to push the bottom of the subframe into the cabin? Therefore, pending any clearance issues (the default clutch pedal his the bolts...) you may get away with a stiffening plate parallel with the two mounting holes?

I'm thinking something like this cardboard mock up for illustration purposes...


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PostPosted: Thu Apr 29, 2021 5:15 pm 
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Torque from the engine is opposite direction to wheel rotation, so it would try to pull the floor down, not up.
I've not seen 200 HP Toyota conversions damage the floor, but their problems were all around the lack of any rigidity at the RF corner of the subframe, after people cut the RH side out to fit the engine in.
I had a bit to do with 3 of these. :roll:

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