RDU Ratio

Auggie · May 12, 2016, 04:24:58 PM

Does anyone know what the RDU ratio of my 2015 SHO non PP is ?

Auggie

Brucelinc · May 12, 2016, 05:42:47 PM

2.77.

Auggie · May 12, 2016, 06:16:13 PM

OK thanks. Now what is the trans OD ratio .70?

Brucelinc · May 12, 2016, 06:34:36 PM

.0742.

SHOdded · May 12, 2016, 06:38:13 PM

Wikipedia has some answers:
https://en.wikipedia.org/wiki/GM-Ford_6-speed_automatic_transmission

Brucelinc · May 12, 2016, 07:00:29 PM

Mediaford.com has tons of information, too.

Auggie · May 13, 2016, 11:03:33 AM

Hey guy's, thanks a bunch.

Auggie

AJP turbo · May 13, 2016, 03:09:59 PM

Quote from: Brucelinc on May 12, 2016, 05:42:47 PM
2.77.

That is the final drive.....I don't think the ring and pinion in the rear needs to be the same....The focus RS is different and the clutch packs handle the torque delivery I think.

Auggie · May 13, 2016, 04:07:53 PM

So, if I was to attempt a top end run should I use 4th or 5th gear and what is the max RPM that these engines can reach?

Auggie

AJP turbo · May 13, 2016, 06:47:24 PM

Quote from: Auggie on May 13, 2016, 04:07:53 PM
So, if I was to attempt a top end run should I use 4th or 5th gear and what is the max RPM that these engines can reach?

Auggie

Probaly 6th....why would you think 4th or 5th

FoMoCoSHO · May 13, 2016, 07:24:42 PM

Ajp, we know you have a 140mph log somewhere, what gear were you in?

AJP turbo · May 13, 2016, 10:02:38 PM

Quote from: FoMoCoSHO on May 13, 2016, 07:24:42 PM
Ajp, we know you have a 140mph log somewhere, what gear were you in?

Very end of 5th

Auggie · May 14, 2016, 10:24:43 AM

OK, my second question was "What is the max RPM of these engine"?

Auggie

AJP turbo · May 14, 2016, 10:39:30 AM

Im sure you could rev it to 7000...i dont see much benefit to rev it much over 6k...maybe 6200

Why do you ask?

Auggie · May 14, 2016, 10:46:02 AM

In order to calculate the speeds of each trans gear with the 2.77 rear gear I will need to know what RPM these engines perform the best at. In other words the max RPM at each shift point. I don't think there is enough HP to pull 6th gear for top end ?

Auggie