OBX vs Quaife (with pixors)
Posted 28 January 2009 - 06:11 AM
I’ve been following this thread with great interest as I received my OBX (from Tuna Tom) late October. Upon disassembly I noted all the previously mentioned issues, Poor quality washers, burrs, dirt, etc. The bolts however were grade 12.9. Also mine arrived with the gears properly arranged, so if you do plan on using an OBX don’t just flip the gears assuming they are wrong. I’m guessing it comes down to lack of attention to detail during assembly at the OBX factory.
This next part is in regards to the machining tolerances of the OBX. My plan was to reuse the original ring and pinion in my R200. To help ease the set up of the ring to pinion, prior to pulling the open diff I checked the ring and pinion lash. It was between .006”and .0065”, (near the middle of the factory spec). After pulling the open diff and removing the ring gear I measured from the ring gear mounting surface on the diff to the two faces on the diff where the carrier bearing races seat. I then measured the same areas on the OBX and compared the numbers. The left (drivers side) was within .0005” (half a thousandth) however the passenger side dimension of the OBX was .012” smaller than the original open diff. Rather than try and order a new spacer ring from Nissan I cut an additional spacer from .012” steel shim stock and installed it along with the two original right side spacers. After reassembly the ring to pinion lash was now between .0055” and .006”. This may not be the best way to do it but it worked for me. Also I’m not sure if Nissan offers a spacer as large as I needed as the FSM showed spacer sizes ranging to a maximum of .007” larger than the spacer in my diff.
I hope this helps.
Posted 28 January 2009 - 08:32 AM
Posted 29 January 2009 - 11:10 AM
Posted 29 January 2009 - 11:51 AM
'72 240Z - under construction
'03 350Z - RIP
'66 1600 - U20 w/Mikuni's
Posted 30 January 2009 - 12:51 AM
1-5-3-6-2-4, counter-clockwise from 9 o'clock when viewing from driver side fender
There's something about a white Nissan......
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"Indeed, if fish had fish-lore, and Wise-fish, it is probable that the business of anglers would be little hindered." -JRR Tolkien
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Posted 30 January 2009 - 08:00 AM
I will be taking it apart soon as I have a leaky pinion seal. I didn't replace the pinion seal when I put the LSD in (it was a junkyard R200). I'll post my findings.
In operation the limited slip action is quite good. I would say that it slips less than a Nissan CLSD, but not much. You can easily predict it's behavior during wheel spin. As far as noise, it make a fair amount of gear noise but no clunking. Using a solid or urethane differential mounts will amplify this I'm sure. I have a Ron Tyler/urethane mount in this car. Maybe different gear oil weights can quiet it down more.
- ZZ Top
Posted 30 January 2009 - 12:35 PM
Posted 30 January 2009 - 12:44 PM
Did you check for slop as reported by 75&78Z? You don't want that slop in there, in fact you want the carrier to be hard to get into the housing because it's such a tight fit. Ideally it would be "have to smack it with a dead blow to get it in tight".
It looks like my OBX unit is going to be a drop-in with the factory shims that came out. I need to double check but so far I get about 0.005"-0.007" backlash on the ring gear. I also set the belville washers with about 10ft/lbs of initial break-away torque (preload). I just didn't feel comfortable setting zero preload for fear of gear rattles, or too much preload for fear of excessive wear, so I took a conservative approach. We will see how it works hopefully in a month or so. Snow melts.
Posted 30 January 2009 - 01:40 PM
- ZZ Top
Posted 30 January 2009 - 02:59 PM
Posted 31 January 2009 - 12:58 PM
BTW here is the McMaster Part for 12mm to 10mm bushings for the ring gear bolt adaptors. 10 needed. 6679K14 http://www.mcmaster....partnum=6679K14
On another note. I had my dad apply torque to the input shaft of the diff while I tried to turn the side shafts in opposite directions. It works. I could not break the breakaway torque with two long screwdrives wedged in the stub axle studs, when my dad applied input torque. Pretty cool.
Posted 31 January 2009 - 03:19 PM
- ZZ Top
Posted 09 February 2009 - 06:09 PM
Not the way cygnusx1 unit came:
Please confirm that I am correct on this.
The washers are in perfect shape. Little to no wear after one season of street driving, and a couple track days.
I have my washers arranged like this: ))))((((. There is at least one washer of preload in this configuration.
- ZZ Top
Posted 09 February 2009 - 07:11 PM
Posted 09 February 2009 - 08:51 PM
wow when I spotted the pics from Pete about his OBX and your talk about how yours was assembled incorrectly - it had me thinking if my unit was wrong too. Now given I was one of the first - if not the first to get one of these on Hybridz and give it ago - however my car is still off the road and all I have done is assemble the unit into the diff and paint it ready for the body to get back from the body shop......
Pete great to hear. You are correct with your photos. The lower photo is how mine arrived wrong! How do the rest of the internals look as far as wear?
Anyway I went back to the old threads see here http://forums.hybrid...7&highlight=obx
Back in 2006 - time just flys
Anyway I found my pic of the unit I got and how it was assembled. You can see the difference vs the one from Pete.
70 HS30-00016 240z
72 HS30 240z Ｌ型 2.8
71 HS30 240z Ｌ型改3.2
79 HS130 280zx
82 HS130 280zx T top
2x 73 KP710 160JSSS
74 KB210 120Y Coupe
71 510 1600 Deluxe
Posted 10 February 2009 - 06:18 AM
Yup, mine was assembled like this out of the box:
- ZZ Top
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