1992 LX The street to track to street again build. - Page 15 - Ford Mustang Forums : Corral.net Mustang Forum
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post #491 of 500 Old 06-01-2019, 02:08 PM Thread Starter
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Originally Posted by thadude View Post
Thatís a good idea ^

What is the condition of your upper arms? I had a set of factory ones in there once upon a time that made a very similar noise, I assumed it was the driveline angle getting out of whack. Ended up pulling them and installing TQ arm (enabled me to set the angle) and no more noise.
The upper arms are in good shape the spherical rod ends are still tight so not to worried about them. I also double checked the pinion angle and everything looks good. I'm wondering if something was going on with the rear brakes like the rotor being warped might cause the T2R to make a noise since one side might tighten up the loosen when on the brakes. Maybe that could cause the torsen to make a knocking sound.

I think the best bet is to disable the rear brakes take for a short drive and see if the noise goes away.

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post #492 of 500 Old 06-01-2019, 06:46 PM Thread Starter
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Disabling the rear brakes didn't solve the problem. I also tried driving the car putting it in neutral and yanking the steering wheel back and forth and didn't hear any noises coming from the front. I also did the same thing while applying the brakes and still got the but it didn't change with the steering wheel movement.

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post #493 of 500 Old 06-01-2019, 08:34 PM
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How did you disable the rear brakes?

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post #494 of 500 Old 06-01-2019, 11:01 PM Thread Starter
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How did you disable the rear brakes?
I shouldn't say disabled but I used the prop valve in the car and made the rear brakes basically not function.

I had the car on jack stands I thought what if I start the car put it in gear let it run apply the brakes see if I hear a noise. If used the brakes too hard it would stall the car so I would apply a little gas to load everything up to see if I would hear any noise. I didn't hear anything so I went to the prop valve turned it all the way out to decease the rear as much as possible. Then started the car and put it in gear pushed on the brakes. No matter how hard I pushed on the brakes I couldn't get the car to stall. I could see there would be some load meaning the were still kind of working but not enough to stall the engine with it just idling. I figured that was the closest I would come to taking the rear brakes out of the equation.
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post #495 of 500 Old 06-03-2019, 09:37 AM Thread Starter
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Not much done on the mustang this weekend but took the MOD car out for some fun.

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post #496 of 500 Old 06-08-2019, 04:43 PM Thread Starter
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Well it looks like I finally fixed the knocking sound. I did a few things to the car over the past couple weeks I took the struts out of the car since it seemed like the spring perch was kind of close to the strut tower. Changed the spacers at the top and torqued everything down.

The other thing I did was replace the brake pads on the car. When I was at the last autocross I talked to a few people that I know about the issue. I was told the noise could be any where from the way the rotor was cut when it was made or it could be the pads by a guy that is a Wilwood dealer. I did allot of research on pads and decided to use a Porterfield pad. I went with there R41 compound on the car and what a difference pads make. The car stops so much better and far more consistent then the BP-10 pad. I'm not to surprised considering how much higher CF the R41 pad has over the BP-10.

Unfortunately I didn't follow my normal rule which is only make one change at a time. I should have just worked on the struts and tested the car before doing the pads but I did it all at once. The one thing I did do when I torqued calipers down that I haven't done before was torque the nuts a second time. I have a digital torque wrench when I torqued everything it showed I went to the 30 ft pounds I did both sides of the car then went through them again. Then I went through the second time the top nut didn't move went right to 30 ft pounds the lower nut was at 28 ft pound and turned a bit to get to 30 ft pounds it did this on both sides of the car.

I took the car out for a 30 mile drive today that went very good no problems and no knocking from the brakes which made me happy. I do have a few interior rattles I need to track down and a couple noises but all in all it was a good drive.
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post #497 of 500 Old 06-08-2019, 08:27 PM
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Yah know. I just got my car up and running and I am getting this same exact knocking sound but I get it while I'm coasting at 25 mph down to about 5.

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post #498 of 500 Old 06-09-2019, 11:27 AM
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A bit anti-climatic, I was looking forward to that breakthrough problem, found and solved due to (insert cause), but I'm very happy for you. It's those nagging, hard to pinpoint issues that drive one bonkers. Care to hazard an educated guess on what was happening?

Jay
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post #499 of 500 Old 06-09-2019, 06:33 PM Thread Starter
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A bit anti-climatic, I was looking forward to that breakthrough problem, found and solved due to (insert cause), but I'm very happy for you. It's those nagging, hard to pinpoint issues that drive one bonkers. Care to hazard an educated guess on what was happening?

Jay
If I had to take a guess at it I think the problem was in the rotors or the pads. It was one of those or a combination of them both that caused the problem. I don't think pulling out the struts and torquing it all back down did anything. Everyone I asked at the autocross about the problem said either look at the rotor or the pads.

I'm just happy I'm past it now so I can move on to putting miles on the car. I'm hoping to get it out again next weekend for another drive. The plan is to adventure further away from home this time. I would like to get a couple hundred miles on the car before then end of the month. But that might be a tall order. There is also a autocross at the end of June that I wouldn't mind maybe making the practice event.
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post #500 of 500 Old 06-09-2019, 06:38 PM Thread Starter
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Originally Posted by petmotel View Post
A bit anti-climatic, I was looking forward to that breakthrough problem, found and solved due to (insert cause), but I'm very happy for you. It's those nagging, hard to pinpoint issues that drive one bonkers. Care to hazard an educated guess on what was happening?

Jay
If I had to take a guess at it I think the problem was in the rotors or the pads. It was one of those or a combination of them both that caused the problem. I don't think pulling out the struts and torquing it all back down did anything. Everyone I asked at the autocross about the problem said either look at the rotor or the pads.

I'm just happy I'm past it now so I can move on to putting miles on the car. I'm hoping to get it out again next weekend for another drive. The plan is to adventure further away from home this time. I would like to get a couple hundred miles on the car before then end of the month. But that might be a tall order. There is also a autocross at the end of June that I wouldn't mind maybe making the practice event.

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