Forged Performance/ OS Giken LSD Review (pics)

SPOHN · 04-13-2011, 06:12 AM

Quote:

Originally Posted by Reaper42

I'm not real good with lsd or transmissions with our cars. If my recollection is right, 370's with the sport package have a lsd?? where base models do not??? So you didnt have the sport package with lsd so you bought an aftermarket one? Lemme know if im getting this all right lol cause I'm a lil confused.

Quote:

Originally Posted by Reaper42

So if i got this I would notice a big difference?

Yea I have a base model Z so I didn't have a VLSD in my car. Even if I did, I still would of purchased this. It really is worth it by leaps and bounds if you plan to push or defiantly track you car.

Quote:

Originally Posted by Boost_lee

Liking the review, I will definitely consider this if my Z ever goes down the track route.

Quote:

Originally Posted by A.J@CarbonSignal

Very good and detailed review.

You can't go wrong with OS Giken products.

Thanks. It's defiantly worth it. I wouldn't pass this mod up if you didn't have to.

John@Z1 · 04-13-2011, 11:16 AM

Very nice, I bet it feels like a dream come true.

SPOHN · 04-13-2011, 11:31 AM

Oh it does. As I told Spencer earlier next best mod to a TT. Lol.

370z_2910 · 04-14-2011, 06:10 AM

Quote:

Originally Posted by ChipsWithDips

The sport package includes a viscous LSD. The base model without sport package has just an open diff. Sport package also includes 14" brakes, 19" wheels (vs 18" non-sport), synchro-rev matching, it should be pretty easy to tell.

Yes, i do have all the following sport package, the one that you have mentioned including vdc...

For safety issue, maybe changing the lsd is advisable.....?

Sharif@Forged · 04-21-2011, 05:49 PM

Quote:

Originally Posted by Red__Zed

Glad you like it. The install issues have me a bit worried though.

Just to clarify with respect to the installation issues. We're very familiar with Nissan's habit of using different length and shaped stub axles in the various trims of 350Z. With the 370Z, the base model includes traction control but still an open differential. In the process they also elected to use a revised set of stub axles as well. So with 6 different stub axle choices even OS Giken wasn't entirely sure what ones to use. We ordered one short and one long axle in preparation for the installation. Upon inspection of the OEM parts we discovered that we need two SHORT stub axles NON TAPER with snap ring grooves/snap rings. Instead of sending Chris home and ordering a second short stub axle we machined and modified his existing axle to precisely the same measurements and tolerances of the OEM part which including machining a new snap ring groove. This is a substantial amount of extra time, but we didn't charge the customer of any of this and our objective was to complete the job as promised and get him on the road safely. Under normal circumstances no modifications are needed during install. Mission accomplished.

Shifting gears to the performance aspects, the OS Giken is the highest performing and smoothest engaging clutch-style LSD we've used in every car we've put them in. Prior to using them on the 350Z/370Z, we had used them on the GT-R, Subaru, and Porsche GT3. It's the best kept secret in performance handling and laptime reduction, bar none.

The OS Giken is a 1.5 way clutch style LSD, with a perfectly machined outer case and ring gear shelf. No shims have ever been needed in our installs and that says a lot about their machining processes. The LSD locks 100% under acceleration, and 50% under deceleration and has an undetectable ramp that is seamless in it's engagement.

The best way to test and describe an LSD's action is on track, but the benefits as Chris alluded to are also immediately apparent during street use as well. A full locking differential allows the driver to roll into full throttle much sooner in the corner, without causing speed robbing wheel spin. On the OEM diff this is very noticeable on tight and slow mountain roads such as those that have visited the Tail of the Dragon. In contrast, with a "locked" arrangement you are providing equal thrust to both engines back there (your tires). Although it seems contradictory, you do not want an overload of power to the tire that is gripping, as it quickly causes you to light up BOTH tires and you cannot control the back of the car with the throttle as readily as a locking diff.

Hope that adds some additional color, to an already awesome product. Now lets talk about the OSG Twin Plate Clutches....haha...ok next time. Thanks for reading.

SPOHN · 04-21-2011, 07:54 PM

Thanks for clarifying all this Sharif. This is truly a great performance piece. I'm having so much fun in this car now. It's amazing the traction this baby gives. I actually finally experience the lock under declaration leaving you shop Monday. I wasn't really expecting it but that was amazing also. It almost seemed to oversteer some but very controllable and predictable just waiting for you to accelerate out of turn. I was smiling all the home.

Ryan@Forged · 04-22-2011, 08:39 AM

Very nice review!

The OS Giken differential's really do make a huge difference. We couldn't believe the difference it made on track when we tested them at Road Atlanta. For you track guys this really is a MUST. Enjoy the new diff!

flashburn · 04-22-2011, 09:44 AM

Sounds pretty awesome.

Can I get a PM with a install quote for this? I'll be heading up to Georgia to go to AMP in the fall.

Ryan@Forged · 04-22-2011, 10:56 AM

sent you a PM

Red__Zed · 04-22-2011, 11:10 AM

Sharif--

So the issue was just getting the wrong stub axles, which presumably won't happen now that they know which ones to send?

Sharif@Forged · 04-23-2011, 02:05 AM

Quote:

Originally Posted by Red__Zed

Sharif--

So the issue was just getting the wrong stub axles, which presumably won't happen now that they know which ones to send?

That's correct.

CZero · 04-23-2011, 03:34 AM

Where can I buy this LSD? After oil cooler, pads, and fluid this is to be my next mod so she can be track ready.

SPOHN · 04-23-2011, 09:14 AM

Quote:

Originally Posted by CZero

Where can I buy this LSD? After oil cooler, pads, and fluid this is to be my next mod so she can be track ready.

You can purchase from Forged Performance themselves. Call for best pricing.

Red__Zed · 04-23-2011, 10:09 AM

Quote:

Originally Posted by Sharif@Forged

That's correct.

Excellent. Thanks for clearing that up.

Ryan@Forged · 04-23-2011, 10:27 AM

Quote:

Originally Posted by CZero

Where can I buy this LSD? After oil cooler, pads, and fluid this is to be my next mod so she can be track ready.

We can take care of all of your track needs.

I just sent you a PM!

04-13-2011, 11:16 AM	#17 (permalink)
John@Z1 The370Z.com Sponsor Join Date: Nov 2008 Location: GA Posts: 1,589 Drives: Turbos Rep Power: 19	Very nice, I bet it feels like a dream come true. __________________ Z1 Motorsports will beat any advertised price on Nissan OEM Parts! 770-838-7777 ext 311 AIM: JohnatZ1 email: John@Z1motorsports.com

04-13-2011, 11:31 AM	#18 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Oh it does. As I told Spencer earlier next best mod to a TT. Lol. __________________

04-21-2011, 07:54 PM	#21 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Thanks for clarifying all this Sharif. This is truly a great performance piece. I'm having so much fun in this car now. It's amazing the traction this baby gives. I actually finally experience the lock under declaration leaving you shop Monday. I wasn't really expecting it but that was amazing also. It almost seemed to oversteer some but very controllable and predictable just waiting for you to accelerate out of turn. I was smiling all the home. __________________

04-22-2011, 09:44 AM	#23 (permalink)
flashburn A True Z Fanatic Join Date: May 2009 Location: Central Florida Posts: 1,884 Drives: '12 Corvette GS 6M Rep Power: 19	Sounds pretty awesome. Can I get a PM with a install quote for this? I'll be heading up to Georgia to go to AMP in the fall. __________________ Current Ride: 2012 Chevrolet Corvette Grand Sport Centennial Edition Carbon Flash 6M Previous Ride: 2009 Nissan 370Z Sport Platinum Graphite 7AT

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04-22-2011, 08:39 AM	#22 (permalink)
Ryan@Forged The370Z.com Sponsor Join Date: Dec 2008 Location: Marietta/Kennesaw, GA Posts: 1,527 Drives: Evo 8/Evo 9 MR/GTR Rep Power: 0	Very nice review! The OS Giken differential's really do make a huge difference. We couldn't believe the difference it made on track when we tested them at Road Atlanta. For you track guys this really is a MUST. Enjoy the new diff!

04-22-2011, 10:56 AM	#24 (permalink)
Ryan@Forged The370Z.com Sponsor Join Date: Dec 2008 Location: Marietta/Kennesaw, GA Posts: 1,527 Drives: Evo 8/Evo 9 MR/GTR Rep Power: 0	sent you a PM

04-22-2011, 11:10 AM	#25 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 120	Sharif-- So the issue was just getting the wrong stub axles, which presumably won't happen now that they know which ones to send?

04-23-2011, 03:34 AM	#27 (permalink)
CZero Base Member Join Date: Mar 2011 Location: Houston Posts: 116 Drives: 370z, 951, ST3 Rep Power: 14	Where can I buy this LSD? After oil cooler, pads, and fluid this is to be my next mod so she can be track ready.