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The mkiv Supra Owners Club

420 getrag m3 6 speed conversion


D1andonlyantman

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Hi everyone. New to supras, very New, as in I don't have one yet, but I'm working on that. I've seen a supra I like but the guy says he opted to go for the 420 conversion rather than stick to v160 or 161 due to availability and cost. That raises a few questions. Firstly, I'm guessing it's a bad thing if it was auto or tiptronic converted to manual? Maybe not to function but to price? And also is the 420 box even any good? He says it can take 800bhp no worries. The car looks awesome, running over 600, but I'm definitely keeping my head running the show and not my heart.

 

Thanks

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Personnally if we exclude the value of an original car with an oem setup, I’d be happy buying a Supra running the e46 m3 gearbox. I’ve owned an e46 m3 for over 5 years and the box is as nice as the v160 is in my Supra. It’s also rated for big power, with many people running Turbo e46 M3s (6-800 bhp) in the stock e46 m3 gearbox.

 

In saying that, I don’t think the car would be worth quite as much as a single turbo supra with an original v160 gearbox. If it’s priced accordingly I wouldn’t let it put me off. A bigger consideration would be who did the conversion, who built the car and what exactly has been done to it to bring it to 600bhp. Much more pertinent factors if trying to assess reliability!

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It all depends on the car you want to end up with an original tried and tested V160/161 TT6 car will always command a premium but these 420g boxes have good reviews.

Also is the car going to be a keeper or do you like to swap and change as again a genuine TT6 will be easier to sell on.

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I'll certainly keep the car for a few years at least. And I'll do all my homework on the other mods that got it to 600. Just I know that conversions will never be as desirable as factory manuals, but I was wondering how much less desirable they are, and that the m3 box was a suitable substitute for the v160. Sounds like it might be worth a look though, and the guy is only an hour from me

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I've fitted a number of these 420g boxes and the two biggest gotcha's are:

 

If using a stock ECU, it can be hard to get the speedo to work as there is no speed sensor on the gearbox as BMW's get their speed off the diff. You need run an aftermarket hall effect speed sensor, then use a converter box to communicate with stock dials, or use a GPS speedo. Far easier to do this on a standalone ECU. Not impossible either way, just slight ball ache.

 

The 420g boxes are dual mass flywheels from factory. Most conversion kits convert to a single mass solid flywheel. Due to this there will be extra noise from the box chattering/clunking etc as there is no dampening on it anymore. Some people hate the noise, others don't mind.

 

Other then that, they drive ok and is a decent option if V160 is not in budget.

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I've fitted a number of these 420g boxes and the two biggest gotcha's are:

 

If using a stock ECU, it can be hard to get the speedo to work as there is no speed sensor on the gearbox as BMW's get their speed off the diff. You need run an aftermarket hall effect speed sensor, then use a converter box to communicate with stock dials, or use a GPS speedo. Far easier to do this on a standalone ECU. Not impossible either way, just slight ball ache.

 

The 420g boxes are dual mass flywheels from factory. Most conversion kits convert to a single mass solid flywheel. Due to this there will be extra noise from the box chattering/clunking etc as there is no dampening on it anymore. Some people hate the noise, others don't mind.

 

Other then that, they drive ok and is a decent option if V160 is not in budget.

 

Mike - what adaptor kit would you recommend as being the best to use?

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Mike - what adaptor kit would you recommend as being the best to use?

 

I've tested PMC kits and ABC kits.

 

ABC twin plate kit is pretty much a track only conversion kit unless you are into the race-car clutch feel and hope you never get stuck in stop start traffic.

 

PMC kit allows for a wider variety of boxes and clutch combo's. So you can have a stock feel clutch, easy engagement for stock/moderate power, as well as heavy duty clutch kit for higher hp.

 

Think Collin's adapter do their own version but have never tried it first hand so can't compare with the others, but seems to be a competitor for PMC kit.

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