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Jordan 02-15-2009 08:05 PM

Knocking (not engine knocking) sound when hard shifting.
So I have had this issue for a while and it doesnt seem to be detrimental to anything however it sounds so bad. When aggresiveley accelerating there is a hard clunking noise, I figure with stg2, and a stg1 clutch there is alot more torque that may be moving something excessivley idk, Should i get it checked out or what.

Jordan 02-16-2009 04:33 PM

Guess nobody likes me here...

legacyurabus 02-19-2009 07:09 AM

Is the clunking noise when u shift, or a growling noise while you accelerate?

legacy3076 03-09-2009 06:58 AM

I have the same issue but mine is alittle worse. I have stage2 and a heavy duty clutch/catless exhaust and when i shift aggresivly at all my tranny moves and maybe even the motor now. the reason for this is the bushings being gel filled and for luxury not power. because of this now my exhaust touches the heat shield for the exhaust in the back of the car si it sounds like my car is falling apart lol. I would start looking there.

caramall2 03-09-2009 11:33 AM

In case it's mounts...I installed STI engine mounts and Groupe N MT mount...nice improvement with virtually no increase in vibrations. I didn't install an upgraded pitch stop as it seems that can increase vibrations a lot.

Bbc84 03-09-2009 12:10 PM

I seen some posts about this on NASIOC, and i think people replace the rear diff bushings with stiffer ones to get rid of it.

legacy3076 03-10-2009 02:02 PM

now if i go STI and group N will that handle 400WHP or is it best to step up now

PeterJMC 03-10-2009 02:10 PM

I get that nice thud when shifting and accelerating with authority :)

This is with the 5speed STi Tranny mount. I wast thinking of getting some other driveline bushings but I don't think it's a big deal since I almost never romp though the gears like that. I'm an agressive granny shifter.

Scrad 03-10-2009 03:39 PM

I used to get that thud until I changed to the ACT clutch and LWFL with an STI pitchrod.

legacy3076 03-11-2009 07:48 AM

Wht is LWFL and how is the STI pitchrod i hear alot of complaints about it but that it works.

Scrad 03-11-2009 11:41 AM

LWFL=Lightweight flywheel. When doing the ACT HD clutch a lot of people go with the 06 wrx LWFL. When I got the STI pitch rod and compared it to the stocker I was pissed that it was the same thing only with STI paint on it. But after reading some posts. I guess they use the same mold, but use different materials to make it harder. I guess that it does, because I haven't had any issues with banging.

I'll ugrade tranny and engine mounts when I notice more movement out of the engine.

caramall2 03-11-2009 09:21 PM

I'm no expert, but I'd try the engine and tranny mounts, then if you still have issues, try the pitch rod. 400 whp is certainly pretty hefty.

legacy3076 03-12-2009 06:34 AM

gotcha, I have both the ACT heavy duty pressure plate and lightweight flywheel and they grab hard but i didnt notice how much till the mounts went. now when i shift normally they rock the tranny lol. love the clutch though.

Scrad 03-12-2009 10:23 AM

Yeah mine was grabbing hard till I got on it a few times and drained out the old oil. Now I have about 1k on it and is shifts smooth.

Jordan 03-14-2009 09:25 PM

Wow took almost a month to get some responses.

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