Chassis modifications for roll cage fitment?

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Chassis modifications for roll cage fitment?

Post by Smiler » Tue Oct 09, 2018 10:41 pm

Hello folks,

Are there any 'standard' or common chassis modifications required when fitting a roll cage? I'm thinking along the lines of beefed up or gusseted mounting ponts for the cage.

Also, am I correct in thinking that to be MSA compliant the seat mounts need to be tied into the chassis via a couple of aditional out-riggers?

Regards,

Smiler.


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Chassis modifications for roll cage fitment?

Post by Will Yarrow » Wed Oct 10, 2018 2:21 am

I'd say a plate across the top of the rear end, above where the rear seats end and the petrol tank starts, but others will know better than me.



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Chassis modifications for roll cage fitment?

Post by scimjim » Wed Oct 10, 2018 7:15 am

I can’t see a reg that says the seat must be mounted to the chassis, but it makes a lot of sense.

The cage feet will depend on design - are you keeping the dash and rear seats for example (which may be dictated by the regs for the class you’re competing in).


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Chassis modifications for roll cage fitment?

Post by Smiler » Wed Oct 10, 2018 8:55 pm

Thanks for the replies.

I intend to use the car for hill-climbs, track days and whatever else takes my fancy. I am not building it to suite a particular class or competition as I am changing the engine for something more modern making it invalid for a lot of classes and droping me into 'sports libre' (well, as far as I can make out anyway).

I wan't to fit a cage to protect me from my lack of talent. If I am paying for a cage I want one that will be legal for use in motorsport.

The car has no rear seats but I would like to retain as much of the original dashboard as possible as I feel it is a large part of the cars character.


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Chassis modifications for roll cage fitment?

Post by efi_sprintgte » Wed Oct 10, 2018 9:02 pm

If a traditional 6 point cage is what you intend?

Then (with dash still fitted) the front legs land into nothing much. So some bracing between the main chassis rails and outrigger is needed. At the same time do the same for your seat mounts.


The main roll hoop will need extension boxes onto the chassis tubes.


The rears normally mount straight to the chassis at the point the floor rises up and becomes the boot floor (the back edge of the rear seats).

When my car was road legal and driven to events I had a normal lap belt fitted to the roll cage too, as it made normal driving a lot easier.


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Chassis modifications for roll cage fitment?

Post by Smiler » Wed Oct 10, 2018 9:54 pm

Thanks, a six-point was what I was leaning towards. So long as I have space to fit in it. I am 6'2" and head room is a bit limited without a cage. I have a pair of MX5 seats to go in (original were long gone, replaced with some unknown worn out seats) and will look into lowering the floor to try to gain a little more.
I'm just a little concerned of driving it on the road without a helmet and banging my head open on the cage bars if I get hit by something.


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Chassis modifications for roll cage fitment?

Post by scimjim » Wed Oct 10, 2018 10:16 pm

I think you’ll need to lower the floor with mx5 seats. I just fitted with standard seats and a helmet. You need flame retardant foam on the rollbar whether you have a helmet on or not (scrutineers don’t like scratches on skid lids :D)


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Chassis modifications for roll cage fitment?

Post by Dcrosby13 » Thu Oct 11, 2018 8:03 am

More importantly what engine are you going for 8)


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Chassis modifications for roll cage fitment?

Post by philhoward » Thu Oct 11, 2018 9:18 am

Dcrosby13 wrote:
Thu Oct 11, 2018 8:03 am
More importantly what engine are you going for 8)
Based on my memory and his signature block, I’m guessing a V6 Jag lump?


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Chassis modifications for roll cage fitment?

Post by Nick » Thu Oct 11, 2018 10:46 am

If you change the engine remember in Sports Libre:

A full MSA spec cage is required. This will be 6 point, need documentation etc.Also a HANS system, and a full harness.In reality you are likely to want a proper competition seats as well Read the Blue book

You will also need a National A Licence. You will need to complete about 6 events as a B licence before you can get an A (unless things have changed).

This is the price you pay to compete in a car with a different engine.


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Chassis modifications for roll cage fitment?

Post by swoakes » Thu Oct 11, 2018 10:52 am

Nick wrote:
Thu Oct 11, 2018 10:46 am
You will also need a National A Licence. You will need to complete about 6 events as a B licence before you can get an A (unless things have changed).
Catch 22 if your car has already had an engine change :?: :?


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Chassis modifications for roll cage fitment?

Post by Dcrosby13 » Thu Oct 11, 2018 11:14 am

And yet someone can rock up in a brand new Boxster S and compete in "classic marques"


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Chassis modifications for roll cage fitment?

Post by swoakes » Thu Oct 11, 2018 11:38 am

Dcrosby13 wrote:
Thu Oct 11, 2018 11:14 am
And yet someone can rock up in a brand new Boxster S and compete in "classic marques"
Yep :)


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Chassis modifications for roll cage fitment?

Post by Nick » Thu Oct 11, 2018 11:46 am

Boxster S ,can complete in Roadgoing, No significant car mods required.

I looked a putting a Toyota V6 in my MR2 ,a fairly common mod. As engine never originally fitted to this car would probably put me straight into Libre. I do not make the rules :roll:


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Chassis modifications for roll cage fitment?

Post by swoakes » Thu Oct 11, 2018 12:16 pm

Nick wrote:
Thu Oct 11, 2018 11:46 am
Boxster S ,can complete in Roadgoing, No significant car mods required.

I looked a putting a Toyota V6 in my MR2 ,a fairly common mod. As engine never originally fitted to this car would probably put me straight into Libre. I do not make the rules :roll:
I think the rules are a bit of an Ass at times :roll: Presumably the need for an A licence is because they want the driver to have proven experience competing in what they perceive to be a "fast" car based on the engine change. The fact that many RG cars are much faster than some/ many Libre cars seems to have passed them by; the Boxter being an example although it is arguably safer due to it being modern :w

I think the rules are still catching up with modern technology :?:

Smiler we are a bit off topic here but if you want to compete in your GTE with a non standard engine YOU WILL be in Libre and you WILL need an A licence.

Question is how can you get one if your car does not allow you to run it with a B licence :?: :? :w


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