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OSGiken Diff Thump

 
Old 05-12-2018, 02:58 PM
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Default OSGiken Diff Thump

Just had a new 949 Giken diff installed in the car along with new bearings, seals, and the proper fluid. The diff seems to operate properly while on track. However, when I make a tight turn at low speed (say 2nd gear) I hear a thump thump noise coming from the rear of the car. The axles and wheel bearings are relatively new. I don't see any unusual play in the drive shaft or axles. Has anyone with a Giken diff had a similar experience? Any ideas?
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Old 05-12-2018, 03:48 PM
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Originally Posted by supersuckers View Post
Just had a new 949 Giken diff installed in the car along with new bearings, seals, and the proper fluid. The diff seems to operate properly while on track. However, when I make a tight turn at low speed (say 2nd gear) I hear a thump thump noise coming from the rear of the car. The axles and wheel bearings are relatively new. I don't see any unusual play in the drive shaft or axles. Has anyone with a Giken diff had a similar experience? Any ideas?
My OSGiken only clunk and thumps when it's cold out. After a mile or so or once warm outside it operates smoothly.

Is this after sessions?
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Old 05-12-2018, 06:12 PM
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I've got about 500 miles on mine and it has zero thump at any time regardless of temp. Are you using the OSG fluid?
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Old 05-12-2018, 06:30 PM
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Originally Posted by LukeG View Post
I've got about 500 miles on mine and it has zero thump at any time regardless of temp. Are you using the OSG fluid?
Yup. OSGiken fluid, usually occurs for me when it's <45F

Maybe I need to take the diff out and have a shop adjust/inspect the lash
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Old 05-12-2018, 10:43 PM
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You need to replace the fluid. Any time the giken makes those noises, change the fluid. (Im assuming it was installed correctly. Contact Ben at Puddy Mod Racing with any questions about your install, break in, maintainance...)

Also, dont waste your money on the giken fluid, motul 75w\140 is half the price and works well.

There is a very specific break in procedure, then you change the fluid. IIRC 20 minutes of low speed 10-15 mph tight figure eights, and 200 miles, on a brand new giken, or new clutch packs, then change fluid.
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Old 05-13-2018, 09:42 AM
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Diff has ~10 miles road driving and 30min on track. Thump noise was very noticeable when I drove the car around the paddock 30 min after being on track.

What I was told prior to purchase:
Ready to go after install, but will have a short break in period, no specific procedure.
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