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3.06 final drive swap - game changer!

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3.06 final drive swap - game changer!

 
Old 05-23-2018, 03:50 AM
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Old 05-23-2018, 11:56 AM
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I have NA 55 with "2.82", i went with "3.45",,

it's sooooooooooo fun, really love how it acts,

of curse need to get good grip tires, for traction, and will sacrificing the top speed runs..!,

IMO; long Ratio is really really boring,,

shorter Ratio = unleash the soul of Hp/Tq..

-;ZAYED;-
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Old 05-23-2018, 11:57 AM
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Originally Posted by cm60k View Post
I have NA 55 with "2.82", i went with "3.45",,

it's sooooooooooo fun, really love how it acts,

of curse need to get good grip tires, for traction, and will sacrificing the top speed runs..!,

IMO; long Ratio is really really boring,,

shorter Ratio = unleash the soul of Hp/Tq..

-;ZAYED;-
What did your theoretical top speed drop to?
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Old 05-23-2018, 12:00 PM
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How does one tune the TCU? Is it like there are only a few specialists that can work the black magic in there or?
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Old 05-23-2018, 01:11 PM
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Itís that easy huh.... got me very tempted.

Just one question, by changing final drive are any other components at risk due to the increased power? Please someone help me understand what this does mechanically.
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Old 05-23-2018, 01:51 PM
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Originally Posted by NotABaller View Post
It’s that easy huh.... got me very tempted.

Just one question, by changing final drive are any other components at risk due to the increased power? Please someone help me understand what this does mechanically.
Tires?

What this would change is how much torque gets put to the pavement. This would be greatest in first gear and would decrease in each of the subsequent gears. Therefore, the greatest stress would likely be from a hard launch. Now given the fact that we already easily break traction on street tires when launching, the actual torque put to the pavement at launch wouldn't change. The big increase in stress would be if you did this in conjunction with drag radials that hook up during a hard launch. In this case, the additional torque to the pavement from the new gearing would be "felt" by everything downstream from the differential. Basically the axles.

Long story short, I don't expect anything would be much worse off mechanically on street tires, but use caution with drag radials. Your tires will burn up quicker if you spin them more. Oh, and your cruising RPMS in 7th gear will go up a bit, so some negligible increases in wear and tear (I wouldn't be concerned about that), and lower highway mpg.

Last edited by BalanBro; 05-23-2018 at 01:57 PM.
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Old 05-23-2018, 02:08 PM
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Originally Posted by alexanderfoti View Post
What did your theoretical top speed drop to?
Sorry, i'm not that Expert, but as i know;

top speed depends to number of gears & gearbox tq., with number of diff. Ratios,

you have 7G, with more Engine displacement, means, shorter Ratio will be better range compared with my 5G,

that's why i guess shorter Ratio will be more reliable for better ET's,

if you notice; shorter Ratio is the first thing that BMW with DCT fans doing,,

and of course, that depends to everyone's driving style..

-;ZAYED;-
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Old 05-23-2018, 02:16 PM
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Originally Posted by BalanBro View Post
Tires?

What this would change is how much torque gets put to the pavement. This would be greatest in first gear and would decrease in each of the subsequent gears. Therefore, the greatest stress would likely be from a hard launch. Now given the fact that we already easily break traction on street tires when launching, the actual torque put to the pavement at launch wouldn't change. The big increase in stress would be if you did this in conjunction with drag radials that hook up during a hard launch. In this case, the additional torque to the pavement from the new gearing would be "felt" by everything downstream from the differential. Basically the axles.

Long story short, I don't expect anything would be much worse off mechanically on street tires, but use caution with drag radials. Your tires will burn up quicker if you spin them more. Oh, and your cruising RPMS in 7th gear will go up a bit, so some negligible increases in wear and tear (I wouldn't be concerned about that), and lower highway mpg.
Thanks for the answer. Since the final drive gear is at the end of the transmission, basically everything upstream is safe! So on drag radials, some axles may get fried haha
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Old 05-23-2018, 02:31 PM
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Final drive is in the rear differential, but yes.
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Old 05-23-2018, 02:40 PM
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Originally Posted by BalanBro View Post

What this would change is how much torque gets put to the pavement. This would be greatest in first gear and would decrease in each of the subsequent gears. Therefore, the greatest stress would likely be from a hard launch. Now given the fact that we already easily break traction on street tires when launching, the actual torque put to the pavement at launch wouldn't change. The big increase in stress would be if you did this in conjunction with drag radials that hook up during a hard launch. In this case, the additional torque to the pavement from the new gearing would be "felt" by everything downstream from the differential. Basically the axles.

Long story short, I don't expect anything would be much worse off mechanically on street tires, but use caution with drag radials. Your tires will burn up quicker if you spin them more. Oh, and your cruising RPMS in 7th gear will go up a bit, so some negligible increases in wear and tear (I wouldn't be concerned about that), and lower highway mpg.
If we concider that, shorter Ratio will causes any generic Effictive, then why MB equipped a shorter Ratio on their unique models like:-

*W209 Clk-dtm: 3,06

*R171 Slk55 (BS/Au): 3,06

*W212 E63 TT: 3,06

*R230 SL63: 3,06

*R230 SL65 (BS): 3,06

*R199 Slr M. (722 Edition): 3,17

*R197 Sls Gt: 3,67

-;ZAYED;-
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Old 05-23-2018, 08:57 PM
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Originally Posted by RNS-11Z View Post


speak to Alan. I'm pretty sure he did this with bills car
I did already LOL

This mod will go backwards for SC cars TCU cant handle extra TQ and will have all sorts of issues

NOT for us bro as per normal
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Old 05-23-2018, 10:14 PM
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Hey Celica quick question. For those of us who already have modified TCUs, can you ask your guy if he can guarantee that the coding that’s already been done won’t be written over by this? While you’re at it can you ask him if he has any other trick coding he can do on the TCU? Thanks
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Old 05-24-2018, 12:11 AM
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it like he stole it.
Originally Posted by mr747 View Post
This mod will go backwards for SC cars TCU cant handle extra TQ and will have all sorts of issues
If the TCU is tuned properly to account for the SC and new Final Drive, would this also apply to a Built Trans? (Weistec or Alpha AMS clutches)
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Old 05-24-2018, 07:03 AM
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Originally Posted by alexanderfoti View Post
What did your theoretical top speed drop to?
I did a quick calculation using an online gearing calculator - there's loads of these online. I've only got 1st to 5th here, but it'll give you an idea at the stock rev limit bud. I got my gear ratios online for the "722.9 MCT" via a google search...apologies in advance if these are incorrect.

Originally Posted by Crya View Post
How does one tune the TCU? Is it like there are only a few specialists that can work the black magic in there or?
Pretty much


Originally Posted by BLKROKT View Post
Hey Celica quick question. For those of us who already have modified TCUs, can you ask your guy if he can guarantee that the coding thatís already been done wonít be written over by this? While youíre at it can you ask him if he has any other trick coding he can do on the TCU? Thanks
I think I already asked him this, but I can double-check with him - I'll shout you when I get the answer. I also already asked if he can do anything else, but he declined and said it's too much of a minefield to get involved with and due to the TCU being a PITA to get in and out, he'd rather he didn't get involved with things like this.
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Old 05-24-2018, 06:32 PM
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Originally Posted by MBNRG View Post
If the TCU is tuned properly to account for the SC and new Final Drive, would this also apply to a Built Trans? (Weistec or Alpha AMS clutches)
It has been tested here in Aus and 2 cars went back wards
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Old 05-24-2018, 06:36 PM
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If we can confirm the Canadian spec 63 has the 3.06 we might be able to just plug in a TCU from a Canadian spec car.
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Old 05-24-2018, 10:14 PM
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So i've called Eurocharged and Weistec neither one is willing to code the TCU. I called Bren Tuning they asked that I send an email so the tuner can take a look and see if what I want to do is something he can handle. Does anyone know of a shop in the USA that is willing to do this?
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Old 05-24-2018, 11:07 PM
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Try AMR. Ive read they can tune the tcu for the c63

http://shop.amrperformance.com/
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Old 05-25-2018, 08:34 PM
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BLK, he said it won't overwrite any existing coding that has been performed on your TCU

I just came back from a night drive and it's friggin awesome man. The sad truth of it is that my car is currently probably not that much quicker than a strong FBO C63, but I know where it has come from and it has come on miles from when it was stock.

The low down response and pull at light throttle in 3rd of 4th is so beefy! Full throttle is full of win. Getting off the line is much improved. I sometimes break traction in 2nd in the dry. 3rd gear is a much more aggressive gear in the powerband as it gets to 90. Definitely looking forward to hearing about results from other members when more cars have had this swap carried out
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Old 05-31-2018, 07:09 AM
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I finally had a chance to get the data logger out and phone timing apps to get some numbers:
  • 40-60 - 1.3s (prev best 1.4)
  • 60-80 - 1.7s (prev best 1.7)
  • 80-100 - 2.5s (prev best 2.8)
  • 60 - 120 - 7.7s

Good improvements from this final drive mod, in addition to the state of tune that the motor is in right now (500whp). I was hoping for a little more help at higher speeds, but alas....the W212 is too heavy to put down some fast times that are comparable to even just an FBO W204. I need to decide if I want to continue and keep the car, or if it's worth bowing out at the top of the cars game
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Old 06-01-2018, 12:16 PM
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Awesome results, Thanks for sharing..

-;ZAYED;-
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