FBM 8.8 IRS Rear Diff Conversion
 

We designed a conversion kit to put a ford 8.8 IRS into the FRS/BRZ. This is the same setup we used in many fast S2000's around the world.

We chose this option again, because there are tons of gear rations to Pick from.

Our kit will come complete with Driveshaft shop axles, drive shaft, studs, hubs, the whole works.

Pricing TBA

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how much heavier it it? i know it probably doesnt matter since most people buying this are pushing like 55psi with one gazillion horsepower, but just wondering

I'll get the final weight difference, a little extra weight on the rear tires is a good thing :)

Can't wait to test it!

Holy shit you guys do everything.

WOW full-blown are dominating !

i also assume you're another step closer to running that frs into 9's

You guys are really making it hard for me to save any money for a house lol. Props to you guys for releasing so many top quality parts so fast for these cars.

Seriously! Are you guys building a Pro Street FR-S?

Between your dyno numbers and this rear-end integration, I'm starting to think you are building with a purpose in mind! Sub-10 second FR-S maybe?

Scott

Not sure what we are doing yet :)


LOL, we want to go out and have some fun this year.

You missed a bolt...

LOL, yes it was just for mock up.

Does this mean you've found a need for this part? Yes, I'm asking if you blew up the stocker.

They seriously are not F***ing around. I love these guys. They regularly give me something to bore my co-workers with. (co-workers are not car people)

No, but the stubs going into the diff will only allow for a certain diameter axle. Also the ring and pinion is pretty small.

However, we did find tons of shavings every time we tore the cover off the OEM diff. The stock unit probably would of lasted, but we did not want to invest a ton of money in to the axles, drive shaft ect.. just to find out if it will break.

The main advantage to this swap is the gear ratio options . All of which are under $200 a set.

3.08:1
3.27:1
3.55:1
3.73:1
3.90:1
4.10:1
4.30:1

Giant respect guys. Now that you've solidified axles, rear end, and prop shaft, when will we see a bell housing conversion for GForce transmissions!

-budi

I smell a 3k price tag on this. Not like it will stop me.

We're not sure but the drive shaft and axles won't be cheap.

+1 for the nice choice of gear ratios. IMO, the factory 1st gear is a bit too short.

sub'd

This makes me nervous I can't tell you how many IRS units my kb cobra destroyed before I finally gave in and went SRA. I was also around 800rwtq though

Is the Ford 8.8 from an 03-04 Cobra? I don't think there will be too many of us seeing 800wtq. The choices in gear ratios makes me happy though.

8.8 does arb make a locker for this. :bellyroll: jk

what must that be like???LOL

It was available in other models, but yes it was also in the 03/04.

Bwahaha we need to work together because my co workers are... well. Not abnormally obsessed with cars

Sent from my Nexus S 4G using Tapatalk 2

CLACK CLACK CLACK CLACK, GOODBYE! :burnrubber:

Is there any way to build the preload adjusters for the diff caps(I can't remember what it's called
exactly) into this? If your pushing enough horsepower to need an 8.8 you'll probably need to keep the caps from walking.

With an 8.8 if they are anything like the solid axle 8.8's there is a common problem with the ring gear coming loose. It's all over the jeep forums. Just something to think about. Gem- I forget who makes it, but there is a locker for the 8.8 that is a limited slip/e-locker combo. That would be interesting for a road course.

Shut up and take my money!

We've used this setup in many s2k's, which makes similar HP and Tq numbers without an issue. Only time I have see any type of failure was from aluminum cases twisting under load. We always recommend to use a steel case.

So you guys make a built engine, a built rearend. Now the only real thing to worry about is the tranny. Do you guys plan on offering a solution if that becomes a weak point aswell?

Full Blown have quite a lot of experience with the 8.8 rear-end in the S2000 world, with examples running in the 8's and 9's

Nice to see this development taking place on the FR-S/86/BR-Z platform

V160 or R154 swap could be interesting

The speed with which the aftermarket has evolved for this car is pretty amazing. Gonna be a fun tuner car... :-)

We have no plans for a trans solution yet. We'll see how everything goes first.

at what HP/TQ does the OE one start to fail?

Just thinking ahead. ;) If 450lb-ft launches, 2800lb car, 1.3sec 60ft destroys factory 5 speeds. Then your shop car is pretty close. :-D

budi

Id really like to see the stock trannys breaking point before id even think of a v160. 2-3x the weight maybe? And if i recall it was roughly 30" from the bellhousing to the shifter... Not to mention enlarging the tunnel would most likely be required (went thru all this with one of my mk3 supras)

Don't think I will be needing this part, haha.

i was wondering what about the axles, cause I'm worried about those after seeing E.kanoos 2j 86 blow them on the drag strip

We are working with DSS to get the axles made