what gearbox to use

Post by **dan79** » 01 May 2012, 19:09

Hi I need some advise i have just brought a subaru wrx turbo as a donor car to transfer engine into my 89 desiel wedge but i have been advised that my desiel gear box won't be suitable?? can anyone suggest a suitable replacment box

Post by **bradders89** » 01 May 2012, 20:29

I have a four speed box in mine from a 1.9 petrol and running a 2.0 ej20 and it works fine. Didnt think it mattered what box you had???

Post by **DentedDevon** » 03 May 2012, 19:57

The T25 gearbox was built with different ratios to suit the different engines and applications they were intended for. The diesels usually have quite low gearing.
Low gearing will give you rapid acceleration, but high revs (and less mpg) at cruising speeds.
Have a look at RJES website , there is a chart with the differnt boxes and what sort of rpm/mph you will get.
http://www.rjes.com/html/gearbox_types.html
You can also have a T25 box rebuilt with higher ratios for 4rd & 4th (4th & 5th) , have a look at Aidan Talbots website.
http://www.aidantalbot.com/live/

Also remember you are about to more than double the power you are putting through a box that is already over 20 years old ...... :run

Be prepared for the rebuild.

Post by **toomanytoys** » 03 May 2012, 20:27

Double?? more like 4 times the power.. LOL.. it would be worth having the/a box rebiult with some suitable gearing BEFORE you fit the engine..

Post by **DentedDevon** » 04 May 2012, 06:20

"more than double"....yep, covers four times etc etc ...

As Toomanytoys quite rightly says , if possible its best to get the box right to start with and Aidans your man for the job.

Post by **Tom_whatley** » 04 May 2012, 06:24

Get a renault un1 box its a far stronger box with better ratios

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