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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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11-15-2021, 07:58 AM | #1 |
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Slapping / bouncing feeling when driving slow or changing gears
Be patient with me here,
I’m not to client about gearboxes Ever since I swiped my clutch out it bunny hops like mad in every great change At first I thought it was in the tune, but the tuner can’t find an error (I have logs - Ecutek) So looks to be mechanical I’ll drive 10km 9’ a straight road in 1st at about 2500 Very light pressure on the throttle and the car feels like it’s driving but something slapping back and forth / bouncing Can’t figure out what is causing this any suggestions ? Also before the gear box and clutch change the car always felt like it had a lightened fly wheel which it didn’t, but I felt I had to previously keep the revs up, that seemed to work it’s self out after a re tune though I feel However in this case it feels possibly more mechanical Anyone had something similar ? 2012 86 GTS Heavy duty sprung clutch Forged fork Aftermarket pivot Super pro rear?? Bush Mtec springs Motul oil Rear diff bush compressors |
11-15-2021, 08:14 AM | #2 |
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What make clutch?
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11-15-2021, 03:31 PM | #3 |
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What you say, there, @Ultramaroon - ??
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11-15-2021, 03:39 PM | #4 |
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I think @Tcoat's already asked the important question. If it's not a stock clutch, all bets are off.
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11-15-2021, 07:07 PM | #5 | |
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Quote:
It Appears to be a MANTIC Stage 1 |
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11-15-2021, 07:25 PM | #6 |
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What condition is your trans mount in?
Stock one has a decent amount of slop and can cause bucking in the driveline. |
11-15-2021, 08:07 PM | #7 |
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If you have the rear diff bushings but not the rest of the parts set in the "Positive Traction Kit" from whiteline, you might be getting more play in your rear crossmember and subframe bushings.
I essentially had that problem when I installed whiteline subframe inserts but didn't do the differential bushing until later, the diff was moving around a lot more from stiffening the other parts in the driveline and made it difficult to drive. Also agree with above that you might be getting slop from the transmission bushing. |
11-15-2021, 08:52 PM | #8 | ||
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Quote:
Quote:
Subaru motors have small, lightweight crankshafts and usually feel more like a lightened flywheel compared to a normal inline 4cyl engine.
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11-15-2021, 11:14 PM | #9 |
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was the drive shaft removed at any point for any of this work?
was it clocked correctly?
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11-16-2021, 07:40 AM | #10 | |
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Quote:
If that doesn't do it then like a few have said you could move onto bushings but the most probable cause is what you changed so start with the clutch itself and work back from there.
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11-16-2021, 12:40 PM | #11 |
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The whole driveline is pretty squishy. Couple that with the CV-joint lash and, as @Tcoat has experienced with me hooning in wet patches, it's a recipe for some nasty flutter. I suggest simply going back to a less aggressive (stock) clutch. It's rated specifically for the strength of the transmission anyway.
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11-17-2021, 01:48 AM | #12 |
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