The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: MX5 Gearbox
PostPosted: Wed May 24, 2023 6:32 pm 
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Joined: Mon Dec 12, 2016 9:53 pm
Posts: 1733
Location: Harrow Middlesex
Long shot But does anyone know if the gear changes on a Auto Mx5 are ECU controlled ?

Thanks Dave


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 Post subject: Re: MX5 Gearbox
PostPosted: Thu May 25, 2023 3:06 pm 
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TDC Shropshire Area Organiser

Joined: Sun Aug 21, 2011 5:12 pm
Posts: 7098
Location: Highley, Shropshire
You can get an MX5 with a slush box? WHY?

I suppose the US market, where "driving stick" is an art few possess, might have a use for such an abortion!

I would guess that earlier cars would have mechanical control as fully ECU controlled transmissions didn't really get mainstream until the mid 2000s.

Having used (and had a lot of bother with) the GM 4L30E ECU controlled trans in the Dolomega, next time i'd use something less complex, or even stick to manual transmission if a suitable mechanical control trans wasn't available!

Steve

_________________
'73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!

Maverick Triumph, Servicing, Repairs, Electrical, Recomissioning, MOT prep, Trackerjack brake fitting service.
Apprentice served Triumph Specialist for 50 years. PM for more info or quotes.


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 Post subject: Re: MX5 Gearbox
PostPosted: Thu May 25, 2023 5:38 pm 
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Joined: Tue Jan 31, 2017 4:30 pm
Posts: 59
Location: Sheffield, South Yorkshire
As far as I know, the MKI & MKII Have a conventional mechanical auto box.

There is a mechanical selector lever connected to the box in the normal way.

There is an electrical switch on the selector arm, (Mazda call it the range switch), but all that does is the Neutral/Park starter inhibitor and also the reverse light switch.

No sign of any autobox ECU.

Peter

_________________
1978 Dolomite Sprint - Inca


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 Post subject: Re: MX5 Gearbox
PostPosted: Thu May 25, 2023 9:55 pm 
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TDC Member

Joined: Mon Dec 12, 2016 9:53 pm
Posts: 1733
Location: Harrow Middlesex
Quote:
You can get an MX5 with a slush box? WHY?

I suppose the US market, where "driving stick" is an art few possess, might have a use for such an abortion!

I would guess that earlier cars would have mechanical control as fully ECU controlled transmissions didn't really get mainstream until the mid 2000s.

Having used (and had a lot of bother with) the GM 4L30E ECU controlled trans in the Dolomega, next time i'd use something less complex, or even stick to manual transmission if a suitable mechanical control trans wasn't available!

Steve
Steve

My brother wants a MGB GT but auto, auto MGs are hard to get ive seen a manual car, and i know someone who has a mazda MX5 auto, it was an import thats rusty he want rid off, The MG auto use BW35 which is a 3 speed box where this MX5 is 4 speed, thats the idea

Dave


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 Post subject: Re: MX5 Gearbox
PostPosted: Thu May 25, 2023 9:57 pm 
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TDC Member

Joined: Mon Dec 12, 2016 9:53 pm
Posts: 1733
Location: Harrow Middlesex
Quote:
As far as I know, the MKI & MKII Have a conventional mechanical auto box.

There is a mechanical selector lever connected to the box in the normal way.

There is an electrical switch on the selector arm, (Mazda call it the range switch), but all that does is the Neutral/Park starter inhibitor and also the reverse light switch.

No sign of any autobox ECU.

Peter
Peter

The MX5 ive seen is an early car imported, so hopefully its a conventional mechanical auto box

Thanks Dave


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 Post subject: Re: MX5 Gearbox
PostPosted: Thu May 25, 2023 11:45 pm 
Offline
TDC Shropshire Area Organiser

Joined: Sun Aug 21, 2011 5:12 pm
Posts: 7098
Location: Highley, Shropshire
Quote:
As far as I know, the MKI & MKII Have a conventional mechanical auto box.

There is a mechanical selector lever connected to the box in the normal way.

There is an electrical switch on the selector arm, (Mazda call it the range switch), but all that does is the Neutral/Park starter inhibitor and also the reverse light switch.

No sign of any autobox ECU.

Peter
My GM 4L30E box has a mechanical select rod that needs to be adjusted for exact positioning and also has the inhibit/reverse switch in the selector quadrant, along with a park lock deactivated by the brake light switch and switches for "sport" and "winter" modes.

It also has a massive trans ECU (bigger than the engine ECU) but it doesn't live in the equally massive relay box under the bonnet with the engine ECU. In the original Vauxhall fitment it was hidden behind the dash on the drivers side right up under the bottom of the screen. Unless you were really looking hard, you'd never find it! I've shortened the loom considerably and mounted it behind the glove box on the Dolomega.

Steve

_________________
'73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!

Maverick Triumph, Servicing, Repairs, Electrical, Recomissioning, MOT prep, Trackerjack brake fitting service.
Apprentice served Triumph Specialist for 50 years. PM for more info or quotes.


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