RomanDave's Prius C swap

[Neinris]

Originally Posted by RomanDave

Are you asking about my motor?

If so:

-No rev limiter currently. Until I've got some stronger rods I'll likely set the rev limiter somewhere around 8200-8300rpm.

And yes in this case, swapping to the C56 gearbox is an absolutely magical upgrade. Having the 4.3 final drive instead of the 3.5 makes the whole thing so much better. I'd not be suprised if my 1300cc motor would have been into the 15 second quarter mile range with the C56 box.

The individual ratios of the C56 are most excellent. On the shift from 2nd to 3rd, shifting at ~8800rpm it drops down to only around 6500rpm on gear change.
So it stays in the powerband awesomely.

Attachment 61804

As for the purpose of this car, it's not a daily driver anymore as I've got a work car. But it still returns fairly decent milage, the high compression actually makes it decently economical.

I've been getting somewhere around 5.5-6 litres per 100km. So thats somewhere around 40mpg.
I could still get it a little better with optimizing the ignition timing further, will get there eventually.

That is awesome information! Do you get the Scion xD equivalent in New Zealand? It has a final gear drive of around 3.94, might be something to look into. The xB1, xD, and Yaris all have the same 1st to 5th gear ratio, just different final gear ratio, 4.31, 3.94, respectively and the Yaris here have 3.72, not 3.5 like you mentioned.

I wish I know how to tune the ECM, because I have another "Frankenstein" in mind.

[mitch9521]

Originally Posted by Neinris

That is awesome information! Do you get the Scion xD equivalent in New Zealand? It has a final gear drive of around 3.94, might be something to look into. The xB1, xD, and Yaris all have the same 1st to 5th gear ratio, just different final gear ratio, 4.31, 3.94, respectively and the Yaris here have 3.72, not 3.5 like you mentioned.

I wish I know how to tune the ECM, because I have another "Frankenstein" in mind.

The 1st gen Yaris was labeled as the Echo in Australia, New Zealand and Canada. They have the 6 bolt C150 transmission with the god-awful 3.52 ratio.

The 2nd and 3rd gen Yaris have the slightly better ratio'd C50 with the 3.72FD. I wouldn't even waste my time with swapping in a better FD into a C50 gearset. They're still very much an economy transmission.

[Neinris]

Originally Posted by mitch9521

The 1st gen Yaris was labeled as the Echo in Australia, New Zealand and Canada. They have the 6 bolt C150 transmission with the god-awful 3.52 ratio.

The 2nd and 3rd gen Yaris have the slightly better ratio'd C50 with the 3.72FD. I wouldn't even waste my time with swapping in a better FD into a C50 gearset. They're still very much an economy transmission.

I'd have to disagree, remcafee mentioned that he swapped in the xB1 FD and made the car really lively. I personally would go with the xD FD, which is easy because the transmission is already mated to the engine that I want to swap in.

[RomanDave]

Originally Posted by Neinris

Do you get the Scion xD equivalent in New Zealand? It has a final gear drive of around 3.94, might be something to look into.

I've got two NCP13 C56 boxes here, 4.3 ratio is a lot more preferable than a 3.94. So I wont bother with anything else.

Speaking of which,
I've just finished fitting an AE111 torsen into my spare one.
I'll be honest it battled me all of the way haha.
But I'm glad it's done now, cant wait to see how it performs with an LSD!

Had a few headaches including forgetting to put the speedo drive gear on before pressing the new bearing on...

gearbox.jpg


Some other issues, half way through the run of NCP13 boxes they changed a bearing and shim on one side of the diff head.

So AE111 and early NCP13 have same bearing and shim (19.4mm bearing)

Then late NCP13 and NCP91 have a different bearing and shim. 18.5mm and thicker shim)

So this box turned out to be an early one, but I ordered the late bearing.
So I pulled apart my 2004 C152 and it had the correct shim to make the new bearing work.

Probably about 10-12 hours total work, lots of mucking around.

But I could do one much quicker next time.