My srt has a high pitched squeek/chirp coming from somewhere (engine or trans) between first and second gear. It seems to be more frequent when cold but on occasion does it just for the heck of it. Sometimes it sounds like the trans since it does it at shift points. On the other hand it almost sounds like the engine belt slipping only for a moment (lasting 1/2 to 1 second) like when the supercharger has a load on it at the top of the gear. If any one has any ideas as to what it might be or maybe the same problem- -all help would be appreciated.

 

I take it when the engine is Cold you are talking about, less than red line revs ???? (I hope so).

The supercharger cuts in at either 50% throttle or 2900 rpm. It could be the supercharger clutch on the way out....other than that, no other ideas.

Si

 

This has been discussed extensively on here. Just search for Chirp or Super Charger Chirp. It usually happens at around 2500 rpm, when the SC engages.

It is most likely the supercharger electromagnetic clutch engaging. This happens to my car as well, but has become very infrequent and almost non existant. The Mercedes AMG guys (AMG 32, AMG 55, most of the other SCharged versions) have this happen too. They have tons of self remedies for this including graphite compounds and etc. being applid to the spindle. Many people say this occurs just before the SC clutch goes out. I wouldn't worry about it yet. If you take it to the dealer, they will either do more work than is necessary, keeping your car for weeks, or they will say it's nothing and leave you with headaches. I say, just drive it until it stops with usage (especially if the car was sitting for long periods) or the SC clutch goes out completely (trust me, you'll notice).

Hope that helps!

 

Is it while you are getting into it hard, like close to redline?

 

It seems to do it 95% of the time when it is cold but on occasion it does it when it is warm. If it was the s/c clutch I would think that it would do it more often??? It doesn't do it when I am getting on it. It does it when I am driving it normal, close to the shift point somewhere around 3k. What gets me is that it only does it between 1-2 gear. I am wondering about trans fluid level. Is there any way to check it ourselves? The local dodge guys are complete morons. (my intercooler pump went out two months ago and they said there was no such thing as an intercooler pump on this car and that the supercharger was supposed to cut out like that and fall on its face ----so I would rather not let them touch it) Thanks for all the feedback.

 

The reason I asked about it doing it at a high RPM was because mine would make a strange noise shifting from 1st to 2nd. I finally figured out that it was the rear tire's chirping, it didn't sound like a tire squilling it was more like a sssttt. It's a shame that some of the dealerships are so uneducated about these cars, good luck getting that noise figured out.

 

Mine does, did, the same thing. The SC clutch engages at around 2500 rpms. If you are getting on it, you won't really hear it. When you are just leaving from a stop nice and easy, the transition from not engaged to engaged is less pronounced, and the slipping will occur audibly. Go to the MB forum and search for this. They've been dealing with this for a lot longer than we have. I still think it is the SC clutch. Roll your windows down and see if you can hear it. You can even try to hold your door open on a secluded road. If it's in the trans, you'll hear it come from under the car with the door open. That's how I traced it to the engine compartment.

 

I wanted to bring this topic back up because I am afraid it is happening to me. I also posted on the MB forums, do I dare take it to the dealer ? It doesnt happen all the time and it is very hard to replicate. Also who will be the first to say this could be a direct result from going hard with my renntech pulley and no tune ??? Kinda worried, I am under warranty till next summer or 15,000 miles I don't drive it in the winter so that gives me 2 and 1/2 months to figure it out or to fit with the dealer and have them replace my super charger lol IM SCREWED

 

These all just sound like the belt slipping. It should stop once the belt heats up.

 

That's what I was going to say, too. My previous car did the same after I had a shift kit put in.

 

well dealerships for the MB guys have been replacing superchargers saying this may be the begining signs of failure

 

Yeap - try changing to the Goodyear Gatorback belt.