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M16a vvt to 2005 auto gearbox

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21 Jul 2021 12:24 #236847 by Mrgreg
I’ve got the chance of a 2005 auto box, does anyone know if there stronger than the old auto ???? I want to put it behind a 1600 vvt will it take the increase in power ??. Cheers. Sorry to keep asking this but I’m trying to increase the power but need an automatic. 
 

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22 Jul 2021 07:03 #236862 by zukebob
The auto in the early models was the A172 and in the newer models is the A174 (TW40LE). The A174 is a 4 speed version of the older model and both are rated by Aisin at 110 Nm max torque input. The max torque output (on paper) of the M13 is almost identical to the torque input rating of the transmission. If my memory serves, the Swift Sport M16 that you have is around 150 Nm max torque output.

I don't think anyone here can give you a firm answer that it is okay to put the M16 in front of the auto. If you make the decision to try, Lambert's reply to your previous post suggesting a external cooler would be the best mitigation you can use. I would add that you should also have a transmission temperature gauge in order to monitor the transmission temp.

I started out with nothing & still have most of it left

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22 Jul 2021 08:29 #236867 by Mrgreg
Thanks much appreciated.

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22 Jul 2021 15:50 - 22 Jul 2021 15:55 #236881 by zebooka
Do not mix A174 and TW40E gearboxes. The only common thing is that they are both 4 speed. Nothing else is common. They have different control. Very much different inside.

A172 is a 3 speed gearbox of second generation.

Also TW40E (or TW40LS) has higher torque ration. Aisin AW rates in for 114.5 Nm, while M13A gives 110 Nm and K15B gives 130 Nm. Although torque converter ratio was lowered from upto 2.2 in JB43 to 1.8 in JB74  if I remember correctly.

 

JB43V M18A R7ME 0.795, 1.32/2.64, 4.09, 235/75/15, 4"
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Last edit: 22 Jul 2021 15:55 by zebooka.

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22 Jul 2021 15:59 #236882 by zebooka
Also common issue with "restyle" gearbox (TW40E/LS or how it is called) is direct clutch at the very end of gearbox. It has same size friction disks as forward clutch but stays after planetary gear, so it takes more torque from engine and more load from road. Also 1 disk less than forward clutch. So common issue is slip on 4th gear, or even 3d gear.

JB43V M18A R7ME 0.795, 1.32/2.64, 4.09, 235/75/15, 4"

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23 Jul 2021 06:49 #236898 by zukebob
Good additional information of the Auto zebooka. Thank you.

I already have the link shown in the picture that you attached but have honestly found very little detailed specifications on these transmissions. To date, all of the data I have seen has shown common Jimny years for the A174 and TW40 applications. For that reason I thought that they were separate designations for a common transmission. Perhaps the A174 was used in the JDM models? Either way, glad that you clarified. I would ask that you share some links for the additional data or perhaps an entry in the Bigjimny Wiki. Several have asked similar questions and it would be a benefit to anyone searching this subject.

I started out with nothing & still have most of it left

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