Targa rules!

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Targa rules!

Postby Zeolite » Tue Nov 15, 2016 1:27 pm

Hello MX5 peeps.

Getting Dad's 2003 Nevada derustified and maintained for a season of sport next year. We can't afford the full spec motorsport anymore and Dad is 73 so the plan is to do some autotests, road rallies and also compete in the Targa section of historic events. Has anyone on here gone down that route? It seems to me that the MX5 is just updated Lotus Elan anyway.
I know mods are very limited but any advice on preparing for this would be appreciated. The biggest question I have is about tyres. I had read that the MX5 is very fussy with tyres and with the Targa rules being very specific about E rated and "no competition" tyres I was looking for knowledge of what tyres for running on muddy, wet tarmac and occasionally gravelly surfaces. The car will be expected to do tests in muddy farmyards and some forest roads. (Not stage rally style though).
Looking for a sump guard as well but I think we will probably fab something up rather than pay a lot of money.
I should also say that this will be a budget project as Dad is a pensioner and I am presently "seeking a new challenge". What we do have is lots of tools, general car knowledge, garages and time.

Any comments or advice welcome.

p.s. Yes a LSD is on the radar but as it wasn't fitted as standard on the Nevada I am not sure it would be legal.
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Re: Targa rules!

Postby drumtochty » Tue Nov 15, 2016 8:48 pm

What are the last six digits of the VIN number not all Nevada's had an open diff.
99 Mk2 1.8 IS Silver
08 Mk3 2.0 RC Sport Copper Red
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Re: Targa rules!

Postby Zeolite » Wed Nov 16, 2016 11:08 am

pm sent
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Re: Targa rules!

Postby drumtochty » Wed Nov 16, 2016 11:31 am

Your car has an LSD but it is one of the units that can fail if used on an MOT Brake Tester.

Change the diff oil and look for bits of metal about 10mm x 10mm
99 Mk2 1.8 IS Silver
08 Mk3 2.0 RC Sport Copper Red
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Re: Targa rules!

Postby Zeolite » Wed Nov 16, 2016 11:49 am

This is a Torsen diff right?
What diff oil should be used in these units?
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Re: Targa rules!

Postby drumtochty » Wed Nov 16, 2016 12:08 pm

Type of diff

torque sensing Super-LSD made by Tochigi Fuji Sangyo (TFS)(Now GKN Driveline)

Oil

Mazda have never specified anything but a GL5 oil.

These days the standard is 75W/90 in GL5 from any Halfords or motor factor etc.
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Re: Targa rules!

Postby Zeolite » Wed Nov 16, 2016 1:32 pm

mmmmm
Jacked up the back and tried rotating the wheels.
Mostly one wheel turns without the other moving. They briefly synched when I turned it in reverse but not forward. I am wondering if we are getting drag from the brakes or could it be a diff problem.
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Re: Targa rules!

Postby drumtochty » Wed Nov 16, 2016 4:45 pm

Just drive the car!
99 Mk2 1.8 IS Silver
08 Mk3 2.0 RC Sport Copper Red
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Re: Targa rules!

Postby Zeolite » Wed Dec 07, 2016 12:26 am

"Just drive the car!"

If only it were that easy! It is SORNED now anyway.

Things got delayed a bit while I moved into a new house but in the last week the driver side rear sill has been repaired with weld and filler. The rear brakes are binding on and I will strip the calipers next week. I found a second broken drop link and the rear pads were down to the metal.

This was a car that was being used as a daily driver.
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Re: Targa rules!

Postby sclements » Wed Dec 07, 2016 11:23 am

A torque sensing diff requires drive from both wheels if one wheel has no grip such as jacked up it acts as an open diff.

They are use a lot now in high power FWD cars as they don't exhibit the torque steer and snatchy ness of an old school LSD.

Re tyres - most of the competitors are using winter tyres which are generally e marked, it the gravel rally type of M&S that they don't want as they tear up the road surfaces.
If in doubt contact the organisers of the events you plan to do.

Scott
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