final drive question (I think)

[kwren]

I don't understand all I know about this subject, which is actually nothing

I don't have the #'s off the top of my head but I think it is a change from 3. something to a 4. something final drive?

Is that something that the rear end thingie is all about and... a good a good thing for us... and if so why?

Is it just done for a transmission change from auto to manual?

Is it a thing for any advantage with automatic transmissions?

Would running 225/45/16's be a good idea with our cars stock automatic transmissions?

I nope with this many questions, just about anyone that reads this will know the answer to at least one of them

All help appreciated as always,
Keith

[oab_au]

Hi Keith, there was a discussion on the 'whys and such' of lower gearing here;
http://www.subaru-svx.net/forum/show...t=46226&page=3
Might answer some of your questions.

Harvey.

[odepaj]

Originally Posted by kwren

I don't understand all I know about this subject, which is actually nothing

I don't have the #'s off the top of my head but I think it is a change from 3. something to a 4. something final drive?

Gear swaps from 3.54 (stock) to 4.11/4.44

Is that something that the rear end thingie is all about and... a good a good thing for us... and if so why?

The rear diff needs to be swapped out as well, so as to keep all four tires spinning at the same speed.

It's good in that it makes less work for the transmission and generates less heat. Bad in that it raises your cruising RPMs, they aren't great for long cruising (which is what the SVX was built for)

Is it just done for a transmission change from auto to manual?

Usually that is done with an auto-to-auto swap, but manual transmissions come in those gearings aswell.

Is it a thing for any advantage with automatic transmissions?

The higher that number (lower in "car technical" terms) means the transmission will have more leverage to get the wheels moving, thus causing less strain on the parts inside.

Would running 225/45/16's be a good idea with our cars stock automatic transmissions?

That will only decrease the diameter of the tire, making the speedometer read incorrectly. If im not mistaken, it will also increase your final gearing (I could be thinking backwards about the direction it will affect your final gearing).

I nope with this many questions, just about anyone that reads this will know the answer to at least one of them

We all get what you're trying to say. Car talk is just a glob of words thrown together, most people don't get it

All help appreciated as always,
Keith

Answers in red.

Hope it helps you out!





Dustin

[kwren]

Thanks!

I am considering the different size tire when I replace the 225/50/16 instead of the 17 or 18 inch wheels. 225/45/16. The new size would give me a lower profile sidewall and should add to the stability around curves with less sidewall roll.

From It's good in that it makes less work for the transmission and generates less heat. Bad in that it raises your cruising RPMs, they aren't great for long cruising (which is what the SVX was built for)

Odepaj, This 225/45/16 tire size change would take ,4, almost 1/2 inch off the highth of the sidewall and when the spedo reads 60 would actually be going 58 ish 57.9!

Not much affect on our cruising speed .

I assume the ride would be a tad less comfortable and stiffer. I think I would like the look of the shorter sidewall. I am just kicking it around, but I might just try it. Discount tires will let us do a test and if I wanted to go back to 225/50/16 or put on my new 18 inch wheels with 215/40/18 (different offset might be a problem with regular width tires... Nissan Murano.) Do not want to roll the fenders

Like their commercial, I could either "bring it back" to Discount tire or possible find the little old lady in their commercials and get her to "bring it back"

Any input on the idea and if I missed something here, please respond!

Thanks,
Keith

[kwren]

Originally Posted by oab_au

Hi Keith, there was a discussion on the 'whys and such' of lower gearing here;
http://www.subaru-svx.net/forum/show...t=46226&page=3
Might answer some of your questions.

Harvey.

Great information Harvey!

Thanks,
Keith