mccorry Posted November 25, 2006 Share Posted November 25, 2006 When I accelerate HARD in 1st or 2nd gear... at around 4,000 RPM and up, I get a growling noise from the back... I originally thought it was maybe the tires slipping / grabbing for grip... or the exhaust hitting the swaybar during squat (I am lowered 1") ... Then I was thinking that maybe it is my center differential spinning. I have no other drivability problems... no vibrations... no other noises..... What is the symptoms of a center differential being overwhelmed by torque? Does anyone else seem to have this problem? Again... it is only under hard acceleration at higher RPM's. It really sounds like it is coming from the back. Link to comment Share on other sites More sharing options...
stiinc Posted November 25, 2006 Share Posted November 25, 2006 I think I have the same problem (full stage 2) samething happens lasts for a second or 2 then it's gone.....I recently switched back to the stock tires and really started noticing it. I though it might be the rear tires loading up with the weight transfer as mine sounds like the tire noise amplifies to twice as loud for a few moments...Are you on stock rubber? I switched back to stockers when I went to stage two, as snow was approaching and my summers are no good at all, so I don't know if it was the power increase on the diff or just the tires. Link to comment Share on other sites More sharing options...
whitetiger Posted November 25, 2006 Share Posted November 25, 2006 I also have this problem. sounds like the rear diff and it only happens in 1st gear if a gun it hard Link to comment Share on other sites More sharing options...
mccorry Posted November 25, 2006 Author Share Posted November 25, 2006 Stock tires, stage 2. I have heard other people mention that it could be the prop shaft bushing... for the driveshaft. ??? Link to comment Share on other sites More sharing options...
LittleBlueGT Posted November 25, 2006 Share Posted November 25, 2006 For me (and others I believe) it gets waaaaaaaaaay worse when it is cold. Today it is cold and I can do it in first, second, and once even in third. Last week it wasn't too cold and only in first. In the summer when it is warm I never have it happen. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
mccorry Posted November 25, 2006 Author Share Posted November 25, 2006 Yeah... I have the same experience... I didn't notice it until is started to get colder out. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted November 26, 2006 Share Posted November 26, 2006 Anybody else have this problem? Bout time we got this fixed, or figured out the problem and a proper solution. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
hogmeat Posted November 26, 2006 Share Posted November 26, 2006 I have this problem. It's been diagnosed as washers in the exhaust. Doc says it's too far along to remove them. I am DOOMED. I'm pleasantly surprised... It was most certainly worth the couple bucks and 10 mins of my time. CLICK HERE FOR THE HOGZAUST Link to comment Share on other sites More sharing options...
mccorry Posted November 27, 2006 Author Share Posted November 27, 2006 ^^^^^^^^^ Hogger... it isn't the exhaust.... (I am Hogzawst stg. 2 for a long time). This has come on with the colder temperatures.... definately different noise. Link to comment Share on other sites More sharing options...
TRS Posted November 27, 2006 Share Posted November 27, 2006 Began doing it the last couple months at WOT from a standing start. Thought it might be the rear suspension loading up at first but don't think so now. No obvious signs of any contact between sway, exhaust, diff, etc. Link to comment Share on other sites More sharing options...
TravisS Posted November 27, 2006 Share Posted November 27, 2006 Still only happens for me on hard, 1st gear acceleration. Sure sounds a lot like the rear-inside tire to me (on stock suspension / rubber) Link to comment Share on other sites More sharing options...
mccorry Posted November 27, 2006 Author Share Posted November 27, 2006 It has to be something common.. cause we all are experiencing it. Link to comment Share on other sites More sharing options...
zorgof19 Posted November 27, 2006 Share Posted November 27, 2006 Hey guys, I had a similar sound coming from the rear of my car under hard acceleration in 1st and sometimes 2nd. I took my car the my dealership, and they put sensors all over my suspension and found that the problem was the rear struts making noise when they were loaded pretty hard. They gave me no crap about being TDC stage 2, and did all the work under warranty. It has been three weeks since and I have not heard the noise again. Link to comment Share on other sites More sharing options...
TravisS Posted November 27, 2006 Share Posted November 27, 2006 Hmmm, interesting. I wonder though, aside from the fact there's a weird noise, is there actually a problem? My car's out of warranty now, so that kinda sucks. But it would still be good to know. Link to comment Share on other sites More sharing options...
TRS Posted November 27, 2006 Share Posted November 27, 2006 Hey guys, I had a similar sound coming from the rear of my car under hard acceleration in 1st and sometimes 2nd. I took my car the my dealership, and they put sensors all over my suspension and found that the problem was the rear struts making noise when they were loaded pretty hard. They gave me no crap about being TDC stage 2, and did all the work under warranty. It has been three weeks since and I have not heard the noise again. Any idea what they did? Link to comment Share on other sites More sharing options...
zorgof19 Posted November 27, 2006 Share Posted November 27, 2006 Yeah, they just replaced the struts, or at least that is what they told me. I have to take my wife's 2.5rs in for a broken window this week, so I will ask the service manager for some details on the repair. My car has actually made that strange groaning sound since very early in its life. I have just never been able to consistantly reproduce the sound untill lately. So i think that my stut or struts may have been defective from the start. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted November 27, 2006 Share Posted November 27, 2006 I got Bilsteins on my car. I really don't think the struts are the problem, I just can't see it. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
LittleBlueGT Posted November 27, 2006 Share Posted November 27, 2006 Talked to Jack at iON performance and he said in cold weather this is fairly common. A few STIs have had similiar problems up here as well. According to Jack the noise comes from a combination of many rubber bushings holding the rear diff and assembly in place. As far as he knows there is no polyurethane kit for the LGT, but says NVH would go up a lot. Lithium grease was given as a possible help for the problem. I don't know if that helps, but it would be nice to hear from somebody that has at least reduced the problem. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
caramall2 Posted November 28, 2006 Share Posted November 28, 2006 Funny, just noticed a similar noise this week before I read this forum. Didn't seem to be happening all the time though, but definitely a lower gear, more throttle issue. Concerned it might be a rear diff sound too. Hopefully it's the rubber bushing theory becoming squeeky in the cold. Temps have dropped here a lot the past week. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted November 28, 2006 Share Posted November 28, 2006 Funny, just noticed a similar noise this week before I read this forum. Didn't seem to be happening all the time though, but definitely a lower gear, more throttle issue. Concerned it might be a rear diff sound too. Hopefully it's the rubber bushing theory becoming squeeky in the cold. Temps have dropped here a lot the past week. Your diff is fine! Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
caramall2 Posted November 29, 2006 Share Posted November 29, 2006 Thanks for the reassurance. (Little Blue -- I finally got a block heater installed today; also had fun in the snow.) Link to comment Share on other sites More sharing options...
BigT Posted November 30, 2006 Share Posted November 30, 2006 I've been noticing the same noise. I notice it in 1st 2nd 3rd and 4th gear. But only when I'm really on it hard. probably the last 2000 - 1500 rpm. I don't hear it in 5th because I've never had the revs up that high! I went stage 2 in the summer and only noticed it when it started getting cold out. We should get a list going of our upgrades to see what the differnces could be. I've got Borla exhaust so I doubt it's that. I'm on re92 and stock struts still though. Link to comment Share on other sites More sharing options...
20thGTI2LGT Posted November 30, 2006 Share Posted November 30, 2006 Same noise for me as well, I thought it was my stuts but i recently replaced one rear one becuase it was blown and now that the weather is colder its starting to pick up again. I'm guessing that it is what everyone else suspects, either tire rubbing or bushings making noise. Im on Tein S techs but I never notice it when its warm outside Link to comment Share on other sites More sharing options...
mccorry Posted November 30, 2006 Author Share Posted November 30, 2006 I have it...... My mods are.... Tein H-techs on stock struts Stage 2 - 18 psi boost Stock RE92s on stock wheels Hogzawst exhaust mod Link to comment Share on other sites More sharing options...
whitetiger Posted November 30, 2006 Share Posted November 30, 2006 I think its the rear diff clutches making noise doin their limited slip thing since it happens in high tourqe scenarios when one of our rear wheels would normally spin if we had an open rear diff. Link to comment Share on other sites More sharing options...
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