FBM 8.8 IRS Rear Diff Conversion - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

OrbitalEllipses · 03-27-2013, 06:14 PM

It's a shame this will cost more than just swapping R&P for the overpriced Cusco part.

Huehuecoyotl · 03-27-2013, 07:52 PM

How does one know whats 'needed'?
I dont have the engineering background, but what are the specs for OE axles and DS?
at what power level does changing the rear diff require shafts and axles? The only vehicle I have uprated DS and axles, and diff is my truck(did them myself so not new to this sort of work), but I am new to sports car diff modding 'standards'

Pure Automotive · 03-27-2013, 08:02 PM

This mod, in my opinion, isn't a matter of handling more power, its a matter of having multiple options to gear the car for its power band. The cusco ring and pinion is great if you are looking for shorter gears with more instant power response, especially for road race/ autox applications. But the reason I will be getting this is for drag. In a 400hp FRS trying to get down the 1320 as quick as possible, its a terrible situation to have to shift 1st and 2nd so quickly and then shift into 5th before crossing the traps. It's much more ideal, particularly in a high horsepower FI car, to have more time between gears and only have to use 4 of them instead of 5. On the flip side, having the longest gears you possibly can also will slow the car down. You have to test and find the best ratio that suits your setup.

OrbitalEllipses · 03-27-2013, 08:06 PM

Quote:

Originally Posted by Pure Automotive

This mod, in my opinion, isn't a matter of handling more power, its a matter of having multiple options to gear the car for its power band. The cusco ring and pinion is great if you are looking for shorter gears with more instant power response, especially for road race/ autox applications. But the reason I will be getting this is for drag. In a 400hp FRS trying to get down the 1320 as quick as possible, its a terrible situation to have to shift 1st and 2nd so quickly and then shift into 5th before crossing the traps. It's much more ideal, particularly in a high horsepower FI car, to have more time between gears and only have to use 4 of them instead of 5. On the flip side, having the longest gears you possibly can also will slow the car down. You have to test and find the best ratio that suits your setup.

Straight Mustang style Brady, 2.73 R&P! lawl!

dsmx17 · 03-27-2013, 08:20 PM

Quote:

Originally Posted by OrbitalEllipses

Straight Mustang style Brady, 2.73 R&P! lawl!

haha, id laugh my ass off if a gt500 guy ran the 6spd with the 2.73 300mph yo!

FullBlown · 05-10-2013, 04:17 PM

We'd like to thank Frank and the guys at DSS for coming through for us and providing the final pieces to our 8.8 rear diff conversion

- Pro level Axles
- Custom Carbon Fiber Driveshaft.

thejevans · 05-10-2013, 04:23 PM

This looks awesome. For it's going to come down to the price difference between this and the cusco final drive + carbon drive shaft. I like this much more, though, so I still might spring for it.

SmsAlSuwaidi · 05-10-2013, 04:30 PM

Quote:

Originally Posted by FullBlown

We'd like to thank Frank and the guys at DSS for coming through for us and providing the final pieces to our 8.8 rear diff conversion

- Pro level Axles
- Custom Carbon Fiber Driveshaft.

OMG

!! i must get boosted ASAP and add this

what about pricing

?

Subzero · 05-10-2013, 05:19 PM

Curious---any advantage to launching in 2nd and shifting to 4th and then 6th? I've heard of some high powered STIs doing that. Some of you mention losing too much time shifting and I figured I'd mention it.

NomoreNA · 05-10-2013, 05:57 PM

Quote:

Originally Posted by Subzero

Curious---any advantage to launching in 2nd and shifting to 4th and then 6th? I've heard of some high powered STIs doing that. Some of you mention losing too much time shifting and I figured I'd mention it.

If flat foot shifting isnt fast enough buy a clutchless trans from liberty.

usptwins · 05-10-2013, 06:49 PM

Im feeling that the R154 will be the most likely alternative from Marlin Crawler. I like this whole deal, just will be really expensive... IMO

NomoreNA · 05-10-2013, 11:06 PM

This is pure speculation, but given the fact that fb had a driveshaft made for this kit I am going to guess a dogbox is being considered.

Tansey86 · 05-10-2013, 11:15 PM

Quote:

Originally Posted by NomoreNA

This is pure speculation, but given the fact that fb had a driveshaft made for this kit I am going to guess a dogbox is being considered.

Could it be custom because it can handle more power and bolts up their 8.8 diff ? May not be transmission related.

Then again....it is FBM and they may be going all out.

NomoreNA · 05-10-2013, 11:20 PM

Quote:

Originally Posted by Tansey86

Could it be custom because it can handle more power and bolts up their 8.8 diff ? May not be transmission related.

Then again....it is FBM and they may be going all out.

I thought about that, but I feel like they would have just went with a traditional aluminum driveshaft if their only intention was making a complete kit. I don't think they would intentionally drive the cost of the kit up with a CF driveshaft knowing the transmission will be the weak link, unless they had plans to solve the issue.

05-10-2013, 04:23 PM	#77
thejevans Rugger Extraordinaire Join Date: Jul 2012 Drives: 1997 Miata, R.I.P. 2013 Red FR-S Location: Derwood, Maryland, United States Posts: 538 Thanks: 142 Thanked 258 Times in 145 Posts Mentioned: 53 Post(s) Tagged: 0 Thread(s)	This looks awesome. For it's going to come down to the price difference between this and the cusco final drive + carbon drive shaft. I like this much more, though, so I still might spring for it. __________________ 1994 Plymouth Acclaim - Engine died and went to cash for clunkers 2001 Dodge Neon R/T- Hydro-locked engine and parted out 2003 Nissan Sentra SE-R Spec-V - Traded for next car 2013 Scion FR-S - Got taken out by a distracted driver while I was sleeping. Total loss. 1997 Mazda Miata - Current

05-10-2013, 05:19 PM	#79
Subzero Old... Join Date: Feb 2013 Drives: Subaru Location: Invisible Posts: 88 Thanks: 76 Thanked 40 Times in 27 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Curious---any advantage to launching in 2nd and shifting to 4th and then 6th? I've heard of some high powered STIs doing that. Some of you mention losing too much time shifting and I figured I'd mention it. __________________ http://youtu.be/manxPVTLth8

05-10-2013, 06:49 PM	#81
usptwins Toyota Soul Join Date: Aug 2012 Drives: 96 taco Location: Louisiana Posts: 528 Thanks: 725 Thanked 99 Times in 78 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Im feeling that the R154 will be the most likely alternative from Marlin Crawler. I like this whole deal, just will be really expensive... IMO __________________ No replacement for Displacement??? Tell that to the people with a 2JZ.

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03-27-2013, 06:14 PM	#71
OrbitalEllipses Banned Join Date: Jan 2012 Drives: Attitude Location: MD Posts: 10,046 Thanks: 884 Thanked 4,889 Times in 2,902 Posts Mentioned: 123 Post(s) Tagged: 4 Thread(s)	It's a shame this will cost more than just swapping R&P for the overpriced Cusco part.

03-27-2013, 08:02 PM	#73
Pure Automotive Join Date: Nov 2012 Drives: 2013 FRS Whiteout Location: Millersville, MD Posts: 2,035 Thanks: 735 Thanked 1,952 Times in 650 Posts Mentioned: 147 Post(s) Tagged: 0 Thread(s)	This mod, in my opinion, isn't a matter of handling more power, its a matter of having multiple options to gear the car for its power band. The cusco ring and pinion is great if you are looking for shorter gears with more instant power response, especially for road race/ autox applications. But the reason I will be getting this is for drag. In a 400hp FRS trying to get down the 1320 as quick as possible, its a terrible situation to have to shift 1st and 2nd so quickly and then shift into 5th before crossing the traps. It's much more ideal, particularly in a high horsepower FI car, to have more time between gears and only have to use 4 of them instead of 5. On the flip side, having the longest gears you possibly can also will slow the car down. You have to test and find the best ratio that suits your setup.

05-10-2013, 04:17 PM	#76
FullBlown Senior Member Join Date: Sep 2012 Drives: Scion FRS Location: MN Posts: 1,171 Thanks: 242 Thanked 2,026 Times in 548 Posts Mentioned: 298 Post(s) Tagged: 4 Thread(s)	We'd like to thank Frank and the guys at DSS for coming through for us and providing the final pieces to our 8.8 rear diff conversion - Pro level Axles - Custom Carbon Fiber Driveshaft.

05-10-2013, 11:06 PM	#82
NomoreNA Senior Member Join Date: Feb 2013 Drives: Raven FRS Location: GA Posts: 149 Thanks: 17 Thanked 68 Times in 41 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	This is pure speculation, but given the fact that fb had a driveshaft made for this kit I am going to guess a dogbox is being considered.

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