Competition Mods

Technical MGB discussion
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Tom Ward
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Competition Mods

Post by Tom Ward » Sat Jun 09, 2018 8:30 am

I have a 76 bgt which has been in dads garage for a few years whilst I carried out some mechanical repairs. These are nearly finished and I'd like to use the car in some competitive manner. I'm thinking hrcr road rallies, the mg speed championship and track days so I want to make some sensible adaptations but I'm not really sure where to start. Mechanically the car will remain standard.

I'm removing the rubber bumpers and fitting fibreglass Sebring valences but before they go on I might need to make some mounting points on the chassis.

Does anyone have pictures of mounting points for things like towing eyes, spot lamp mounts and on the inside seatbelt harness points?

I can spend hours surfing the net and find lots of lovely pictures of the exterior of such things but not what's going on behind the valences!

Better still does anyone have a car in the Suffolk/Essex area I can have a look at?

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Peter Cresswell
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Re: Competition Mods

Post by Peter Cresswell » Sat Jun 09, 2018 9:04 am

Hi Tom,
Firstly a picture of my car:
[attachment=0]Cresswell 2.JPG[/attachment]
Firstly I started with a chrome bumper car rather than a rubber bumper and there will be several things you have to overcome when removing the rubber bumpers - however these are fairly well documented and you can buy the various plated to weld into the front and rear wings to fill up the holes where the bumpers went through. The front valance is a standard valance spaced out to make it flush, but this does give a problem with the front wheel arches. At the rear I used a fibreglass flush valance which is bolted through the boot floor. These are notorious for not fitting, but a reasonable job can be achieved at home. If you PM me with an email address I can send you a guide to fitting these and the problems. I didn't finish the section on the rear valance - maybe I will someday!
The spot lamp brackets are the chrome bumper brackets with the part behind the bumper shortened and a home made bracket for the lamp bolted to it. The car has a Brantz tripmeter with a sensor in the speedo cable, and the passenger has a footrest (MG TD/TF from the 1950s), the seats are MX5. The full harness belts use the standard seat belt mounts for the lap strap with eye bolts, and the shoulder straps use eye bolts with spreader plated through the bottom of the rear panel into the boot. You will be able to find a suitable place through the gap of the rear seat cushion and squab on a GT. Belts should be 'E' marked to be road legal so strictly speaking you can't use FIA marked belts - crazy since an FIA belt is safer! I don't have any towing eye bolts at present, as I only use the car for more serious tours, but they do need a loop of (I think) 2in diameter. Many people use a standard towing eye and just fit a nylon strap to it for competition.

Hope this helps for now!
Attachments
Cresswell 2.JPG
On the Midland Centre Welsh Rallye 2017
Cresswell 2.JPG (4 MiB) Viewed 3074 times
Pete
1969 MGB Roadster
2011 MG 6 TSE Magnette
2007 Mercedes SLK
Plus 32 other cars since 1965

Tom Ward
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Re: Competition Mods

Post by Tom Ward » Sun Jun 10, 2018 11:11 am

Thanks Peter.

You have a pm!

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Peter Cresswell
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Re: Competition Mods

Post by Peter Cresswell » Sun Jun 10, 2018 6:36 pm

Hi Tom,
Some more thoughts!
If starting with a rubber bumper suspension set-up the car could really do with lowering. This would have two advantages - firstly it would look right with the Sebring valances, and secondly it would be more suited for the events you are considering.
When I bought my car, it rode very high at the front and the rear for a chrome bumper car, so I started to consider lowering it, but discovered there is little information out there regarding ride heights given by certain springs, and I had to do a lot of research to establish what was necessary to achieve what I wanted. I did this at the same time as I fitted the flush valances front and rear. This is the set I currently have.
Front 600lb spring with 8.5in free length. On my car this lowered it by 2in at the front. Dampers are 25% uprated valve in the lever arm (They have to be in good condition to do this otherwise they leak even more!), caster is reduced to 4 deg using the B&G kit, and front camber is 1.5deg which is partly achieved by the lowering and fine tuned using off-set poly bushes. Anti-roll bar is 3/4in with poly bush mounts, which has been used to replace all the other bushes as I found the rubber ones sold these days didn't last long.
At the rear the springs are standard and fitted with 1in spacer (this made the car sit level). Currently I have Spax telescopic dampers on the rear which are ok but I feel 25% uprated valves in lever arms and getting rid of the lowering blocks would be a better set up. It is ok on the road though.

You can get the regulations for the MG Speed Championship from here: http://www.mg-cars.org.uk/mgccsc/ , and you will also find the MSA 'Blue Book' here which gives all the rules and regulations for UK Motorsport. you will need full flame proof overalls and underwear plus a crash helmet and (I think) HANS device for sprints and hillclimbs. Information about HRCR historic events can be found here: https://www.hrcr.co.uk/5-ways-to-go-historical/. Don't discount the HRCR Tours either. Some of them run using Road Rally navigation but without timing.
Pete
1969 MGB Roadster
2011 MG 6 TSE Magnette
2007 Mercedes SLK
Plus 32 other cars since 1965

Tom Ward
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Re: Competition Mods

Post by Tom Ward » Sun Jun 10, 2018 7:36 pm

Hi Peter,

Thanks for your help. The car is lowered already and was carried out by a local mg specialist but I don't know exactly what springs he used. Based on the weight of the steering wheel I don't think the castor was adjusted much, if at all. I'll tap him up in the pub when I see him next. I fitted a spax conversion kit on the rear but I've got to go back to original lever arms if used for historic rallying. I'll get round to that.

I suppose I should have mentioned I have been a stage rally co-driver since 2002 at national and international level in modern and historic stage cars so I have a licence, overalls, Hans, helmet and blue book. As a result I have a reasonable idea what I'm aiming for but although I've spent lots of time in competitive cars I've never prepared one, and none of those have ever been an MG!

The hrcr tours are a good start, my wife is keen to come along but isn't up for the competitive side I'm used to, so I think we should find a local one once I'm back on the road (or I could steal dads car before then).

martinbrown345
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Re: Competition Mods

Post by martinbrown345 » Tue May 07, 2019 9:49 am

My father had this car, he had 3 to 4 classical cars, and this one was one of them, still, we have one towing truck off him, which he used for queens towing services.

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Peter Cresswell
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Re: Competition Mods

Post by Peter Cresswell » Tue May 07, 2019 12:27 pm

Hi Martin
As the only pictures on this thread are of TAP 769G I take it this is the car you father had? Do you have any history of the car during your father's ownership or old photos?
I bought the car from Brown and Gammons in Baldock in early 2011, it was a standard MGB then so the mods in the pictures have been done by me. From the receipts that came with the car and the Heritage Certificate, I know it spent it's early life possibly in Eastbourne (as it was delivered to an Eastbourne dealership), then the Bicester area, Southampton, Burton on Trent and Tamworth. Brown and Gammons bought it in from Tamworth.
Where would your father fit into this trail?
I'll send you a Private Message (PM) with my email address so you can send any info that way if you prefer.
Many thanks for your posting,
Pete
Pete
1969 MGB Roadster
2011 MG 6 TSE Magnette
2007 Mercedes SLK
Plus 32 other cars since 1965

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