KameTrick
10-03-2014, 04:34 PM
Hey all, I'm scratching my head over a clunk noise that is coming from the rear of my recently resurrected S13 fastback. I'm in the process of investigating the subframe and rear suspension trying to find it but I hope to benefit from someone's previous experience and shorten the troubleshooting time.
Car: S13 Fastback
Rear Suspension/Drivetrain Mods:
Stance GR+ Coils
Carbonetic carbon clutch 2 way LSD
1 piece driveshaft
Subframe Swap: S13 SuperHicas --> S13 Non-Hicas
Stance solid aluminum subframe bushings
Circuit Sports traction, RUCA, Toe rods
Energy Suspension poly bushings everywhere else
The clunk noise can only be heard during aggressive cornering (autocross or similar degree of side load on the street). Normal/brisk driving it doesn't make any noise. Based on the sound/feel/timing the clunk occurs it seems like something shifts laterally...slightly under the cornering load. Thus far I haven't noticed it disturb how the car tracks through a turn when this noise occurs, but I haven't taken many corners in the car yet.
From what I can tell does not occur in relation to bumps in the road while cornering. Pushing the car side to side while stopped won't recreate the clunk. It does not occur whatsoever with straight line accel/decel/shifting.
All suspension parts have about 900 interstate miles and 1 autocross on them, which was put on them in 2 days (moved to another state right after I finished rebuilding the car then autocrossed it). This car is also LS-swapped, but I doubt that has any relation to this issue. Let me know if you have any ideas about what could be causing it...I don't think there's much left in the suspension with enough play to clunk at this point...
Car: S13 Fastback
Rear Suspension/Drivetrain Mods:
Stance GR+ Coils
Carbonetic carbon clutch 2 way LSD
1 piece driveshaft
Subframe Swap: S13 SuperHicas --> S13 Non-Hicas
Stance solid aluminum subframe bushings
Circuit Sports traction, RUCA, Toe rods
Energy Suspension poly bushings everywhere else
The clunk noise can only be heard during aggressive cornering (autocross or similar degree of side load on the street). Normal/brisk driving it doesn't make any noise. Based on the sound/feel/timing the clunk occurs it seems like something shifts laterally...slightly under the cornering load. Thus far I haven't noticed it disturb how the car tracks through a turn when this noise occurs, but I haven't taken many corners in the car yet.
From what I can tell does not occur in relation to bumps in the road while cornering. Pushing the car side to side while stopped won't recreate the clunk. It does not occur whatsoever with straight line accel/decel/shifting.
All suspension parts have about 900 interstate miles and 1 autocross on them, which was put on them in 2 days (moved to another state right after I finished rebuilding the car then autocrossed it). This car is also LS-swapped, but I doubt that has any relation to this issue. Let me know if you have any ideas about what could be causing it...I don't think there's much left in the suspension with enough play to clunk at this point...