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The mkiv Supra Owners Club

Clutchless Sequential Box


ZXSpectrum

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A friend of mine has bought a nice Supra but its an Auto... No problems, but he is looking to make it a bit more special and was contemplating a Auto to Manual Conversion... We was wondering how much a Hollinger/OS Geiken Or simalar Clutchless sequential box would cost with and without labour... Any of the bigger tuners here able to shine anything on this...?

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There have been any discussions about doing an auto to manual box change, most stop as the costs are very high due to all the changes required. Better to sell the car and buy a manual box IMHO, general consensus among those who have driven both is that there is not much in it between the two.

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  • 2 weeks later...

Hi folks, thanks to ZX for the prelim approach.

 

I am interested in replacing the auto box in the project Supra with a clutchless sequential box. I know they are around £6-£8k for a R34 Skyline so there must be someone out there that can fit me one for under £10k?

 

As far as I'm aware no one has done this yet but if someone has please get in touch with me and swap some tips and contacts?

 

Hope you are all looking forward to the magazine, out at JAE if all goes to plan and you can collect your copy from from ZX or me at the 200+ club stand FOR FREE!!

 

See ya'll soon,

 

Jim

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I'll try :eek:

 

The standard auto-box is a 4speed semi with the 4th gear being overdrive (I think). You can leave it in drive and never move the lever if you so wished...

 

With the sequential you would have to start in 1st and work your way up and down with a flick of the lever upwards to upchange and downwards to downchange. (seen BTCC or Rally's?)

 

Most of these gearboxes are also 6 or 7 speed.

 

Unfortunately do not know how they work so the clutchless bit is a mystery at the moment.

 

Hope that helps :) Or you're as confused as I am? hehe

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If you are thinking along the lines of the WRC gearboxes, here's a few useful numbers. The box used on the Peugeot 206 WRC is the single most expensive component on the car. I can't remember if it is £30K or £60K, but it's more than a Supra.

 

The more conventional type of sequential transmission uses what is termed "power-shifting". This is changing up without the clutch while killing or retiming the ignition to dip the power at the point the gear changes. This takes the load off the gear selector mechanism. On a normal dog type gearbox (as opposed to a synchromesh one) you can perform clutchless up-changes by

momentarily lifting off the throttle while changing gear. This also relies on the ratios being very close so the gears are rotating at relatively close speeds.

 

This type of transmission is totally unsuited to road driving.

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Cheers John,

seems most people probably give up on this idea as the support is soooo optimistic. I wasn't suggesting a works spec Rally gearbox btw. Just a pointer as to the idea that's all.

 

I don't know the technical issues at this stage but, as I said, if you can get one for the Skyline circa £8k (and my friend Ged has one fitted and uses his car almost daily on the roads) then there MUST be someone that can sort out one for a Supra? Surely?

 

Ah well, it was worth a try eh?

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"The hollinger box' uses a clutch and powershifting....you won't get a fully clutch pedal-less system on the market."

 

Aha, that will do!! Where and how much Alex? The clutchless thing was simply a "best choice" thing but seems there aren't many choices..

 

Cheer mate.

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Yeah it can be done...just making sure you are aware how it works.

 

GT-ART and Abbey are your best bet to start with...they've fitted the boxes and know the systems. I know that GT-ART have looked at Supra's before and no doubt so have Abbey. If you do it and get it to work well then please post the instructions.... :D

 

Also try http://www.supraforums.com and see if anyone over there can help.

 

Leon Green (JPS motorsport) and Chris Wilson are 2 of our most respected tuners. I would have thought that if the financial backing is there then they could sort it out for you.

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Guys I looked into this a while back. Hollinger do make one for the Supra it's basically the skyline box with a different Bellhousing. The reason I went off the idea was noise, easy of use, & the fact the Hollinger quoted me 550 bhp as the limit of the box. From memory it was £6000 + Shipping etc.

 

Good luck, & if you do it, then I would love to try it.

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Race gearboxes are designed for fast shifts at max revs and are very noisy (they use straight-cut gears). They are usually designed for quick changes of ratios, but have a very short life between rebuilds - maybe as little as 1000 miles or less. Not a lot of use on the road.

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All good stuff, thanks guys. main reason for looking into this was to try and utilise the existing car which is automatic as something new to try instead of starting with a 6 speed standard box/car.

 

£6k sounds about right but the Skyline box was the choice of big tuned cars so the hp limit surprises me at 550?

 

Will check with the boys at Abbey and post my findings. Thanks again all.

 

ps. You are right, they are FLIPPIN' noisy!!!!!

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