EC Supercharger pulley failure... :(
05-07-2013, 11:54 AM
#26
Member
Join Date: Mar 2012
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
2007 S550
So you think the crank pulley failure rate is higher than the SC pulley failure rate? I'm sure there are 100-1 crank pulleys out there as opposed to SC pulleys.
05-07-2013, 12:29 PM
#27
MBWorld Fanatic!
Join Date: Aug 2007
Location: Jacksonville, FL
Posts: 2,596
Likes: 0
Received 4 Likes
on
4 Posts
05 White Pano E55, Cadillac CTS-V
Man, this sucks, I guess it wasn't an isolated case if it has happened 3 times just from the people coming out in this thread. My crank pulley fell off so I went back to stock and have a supercharger pulley installed now. I hope I don't have a problem, almost want to just run all stock pullies and be happy with whatever power I get with just the headers and 80mm throttle body on stock boost.
05-07-2013, 01:08 PM
#29
Member
Join Date: Mar 2012
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
2007 S550
Man, this sucks, I guess it wasn't an isolated case if it has happened 3 times just from the people coming out in this thread. My crank pulley fell off so I went back to stock and have a supercharger pulley installed now. I hope I don't have a problem, almost want to just run all stock pullies and be happy with whatever power I get with just the headers and 80mm throttle body on stock boost.
05-07-2013, 01:09 PM
#30
Super Member
05-07-2013, 01:19 PM
#31
Senior Member
Join Date: Feb 2012
Location: London
Posts: 299
Likes: 0
Received 1 Like
on
1 Post
2004 E55K AMG Wagon
If I knew what I know now, I would have went with 180 crank and left the stock SC pulley on. There seems to be no advantage to doing it with a SC pulley and smaller crank. I actually seen another 55 car get dyno'd ad the same exact time. Bpth were done by the same installer. Difference was he had a 180 and stock SC pulley vs my 168 and SC pulley. HP was 2 les than me. I'm at 503.69, and he was at 501. My HP jumped up faster, but also dropped off faster where his was more linear. Later in the RPM range he had a huge torque advantage on me (like 40) although we both had roughly the same peak torque (537+539).
So given this, and that there have been some other failures (aside from these), I just think it's better to simply go with a larger crank pulley and leave the SC pulley alone. Just my .02
Again, I am no mechanic, but just not seeing the advantage here. The fastest cars, and even vendor cars seem to not even be running the SC pulley.
So given this, and that there have been some other failures (aside from these), I just think it's better to simply go with a larger crank pulley and leave the SC pulley alone. Just my .02
Again, I am no mechanic, but just not seeing the advantage here. The fastest cars, and even vendor cars seem to not even be running the SC pulley.
168 crank with 84mm SC Pulley = 2 revolutions of the SC pulley each revolution of the crank pulley
180 crank with 90mm OEM Pulley = 2 revolutions etc
05-07-2013, 01:27 PM
#32
Member
Join Date: Mar 2012
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
2007 S550
This is NOT a knock on ANY vendor or product. I dealt with Shardul direct to buy my pulley and belt wrap, and he has been nothing but honest, and perfect to deal with. He stepped up to the plate above and beyond what he needed to for me.
I am simply looking for real world info here. I never knew there would be any difference at all until I seen the charts. Again, I also know that some of the numbers are BS, and it's the track times that count. Just wanted to hear some input.
05-07-2013, 01:52 PM
#33
MBWorld Fanatic!
Join Date: Aug 2007
Location: Jacksonville, FL
Posts: 2,596
Likes: 0
Received 4 Likes
on
4 Posts
05 White Pano E55, Cadillac CTS-V
You are comparing two different cars so you can't just assume they will perform the same. First off are the cars modded identically (other than the pullies)? Does one have headers and one not? Does one have a bigger throttle body and the other doesn't? How about one has cats or secondary cats and the other doesn't? Any of these things could change the hp curve. How about cooling, do they have the same stuff there? There are many variables that could change the way the power is mapped on the dyno even though they are running the same boost just in different ways (big crank pulley vs smaller upgraded crank pulley/supercharger pulley combo).
05-07-2013, 02:11 PM
#34
Member
Join Date: Mar 2012
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
2007 S550
You are comparing two different cars so you can't just assume they will perform the same. First off are the cars modded identically (other than the pullies)? Does one have headers and one not? Does one have a bigger throttle body and the other doesn't? How about one has cats or secondary cats and the other doesn't? Any of these things could change the hp curve. How about cooling, do they have the same stuff there? There are many variables that could change the way the power is mapped on the dyno even though they are running the same boost just in different ways (big crank pulley vs smaller upgraded crank pulley/supercharger pulley combo).
05-07-2013, 02:17 PM
#35
MBWorld Fanatic!
Join Date: Jul 2012
Location: Orbiting the planet
Posts: 4,479
Received 1,482 Likes
on
983 Posts
This place is a joke.
My Sc pulley has been fine so far, about 4k miles on it. Just a theory, but I think some are being installed with too much clearance. I installed mine with no shims at all...checked at 3 different places and was .35 to .29mm. Stock spec is .35-.45mm. Rechecked about a month ago and it's still the same. My opinion is the gap should be as small as possible, as long as when everything's hot the magnet and clutch aren't dragging when dis-enguaged (idle) The larger the gap, the more the spring flexes and the more stress on the metal. If mine never breaks I'll prove my case. And for a side note, I have seen the factory one's break in the same way, though not very common. Overall I am very happy with the smaller SC pulley. I felt the torque come on at a lower RPM and gave better driveability in the city as soon as I installed it.
Last edited by E55Greasemonkey; 05-07-2013 at 05:19 PM. Reason: typos
05-07-2013, 03:24 PM
#37
Super Member
Mines cracked too...
This sucks, I just checked my smaller SC pulley.... It's cracked just like the other pics. Funny, I heard a squealing/grinding noise coming from my engine bay that started 3 days ago. Glad I haven't been driving it hard.
05-07-2013, 03:27 PM
#39
MBWorld Fanatic!
My Sc pulley has been fine so far, about 4k miles on it. Just a theory, but I think some are being installed with too much clearance. I installed mine with no shims at all...checked at 3 different places and was .35 to .29mm. Stock spec is .35-.45mm. Rechecked about a month ago and it's still the same. My opinion is the gap should be as small as possible, as long as when everything's hot the magnet and clutch are dragging when did-engauged (idle) The larger the gap, the more the spring flexes and the more stress on the metal. If mine never breaks I'll prove my case. And for a side note, I have seen the factory one's break in the same way, though not very common. Overall I am very happy with the smaller SC pulley. I felt the torque come on at a lower RPM and gave better driveability in the city as soon as I installed it.
My mechanic used an instrument to measure the stock and said it's .25mm and then he put on the S/C and said it's too much so took out the two factory shims and that's it put the S/C back on. Now I have it installed with no shims at all.
I also just (3-4 days ago) got the S/C pulley from Eurocharged , I am very happy with their customer service hopefully this doesn't happen with mine *fingers crossed*.
I think with S/C pulley there isn't much boost in torque rather hp compared to Crank pulley
OP hopefully you'd get a fix on your beast soon
05-07-2013, 03:31 PM
#41
Newbie
Join Date: Oct 2012
Location: England
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
o6 e55K AMG
Just checked my own fittment out this afternoon after a call from one of you guys, mine's only been on for approx 1500miles, but done a trackday and a Vmax day in that time, but my own pulley still looking good. I would say, I had to have it reshimed at one point as it was dragging, needed 2 further shims, but all seems good at the moment, but as others will continue to monitor whats happening here and and to my own car, its a little bit of a concern, but hopefully this is isolated instances and glad there appears to be no major damage to the suffering parties bar inconvenience and a bit of aggrevation, hopefuly, happy endings alround. Modding cars, who'd do it! Most of us it seems
Modding cars, who'd do it! Most of us it seems
05-07-2013, 03:32 PM
#42
MBWorld Fanatic!
I will go an check mine too today and report back lol Im so scared.
I got less than 300 kms / 150 miles on mine though.
I got s/c pulley cuz it's safe and what not lol and this is this new issue.
05-07-2013, 03:32 PM
#43
MBWorld Fanatic!
Join Date: Aug 2007
Location: Jacksonville, FL
Posts: 2,596
Likes: 0
Received 4 Likes
on
4 Posts
05 White Pano E55, Cadillac CTS-V
**** me sideways, it is like the RTR crank pulley saga all over again, just hopefully not as devastating if it lets go. Wish I was home to check mine now but that is going to have to wait a few months. I have like 4000-5000 miles on mine and run her hard and put her away wet.
So all you guys with the failed pulley, how many shims did you put in? Lets see if there is some kind of correlation like Greasemonkey was talking about (less is better).
So all you guys with the failed pulley, how many shims did you put in? Lets see if there is some kind of correlation like Greasemonkey was talking about (less is better).
05-07-2013, 03:43 PM
#44
Member
Join Date: Sep 2010
Location: SoCal
Posts: 120
Likes: 0
Received 0 Likes
on
0 Posts
05 E55 AMG , 04 IS300 2JZGTE, 17 IS200t, 13 CBR 1000RR
i had the same problem, didnt say anything about it because the seller replaced it, im all stock had it on for about 1000 miles daily. second one seems to be good
05-07-2013, 04:12 PM
#46
MBWorld Fanatic!
05-07-2013, 04:13 PM
#47
MBWorld Fanatic!
Total of 5 now????
Looks like we need to compile data.
-date purchased s/c pulley
-mileage with smaller s/c pulley since install/breakage
-amount of shims
-often of hard runs daily/weekly
Guess i'll be checking mine as well when i get home. What i noticed from the original poster's first pic, both sides of the pulley seem to be dented in on both sides.
Looks like we need to compile data.
-date purchased s/c pulley
-mileage with smaller s/c pulley since install/breakage
-amount of shims
-often of hard runs daily/weekly
Guess i'll be checking mine as well when i get home. What i noticed from the original poster's first pic, both sides of the pulley seem to be dented in on both sides.
Last edited by novae500; 05-07-2013 at 04:20 PM.
05-07-2013, 05:12 PM
#48
Super Member
Join Date: Jul 2012
Location: San Diego
Posts: 701
Likes: 0
Received 6 Likes
on
6 Posts
05 E55, 07 ML500
Going to check mine today... I used all 4 shims Shadul supplied as well as all oem shims.. When first installed it was out of spec, I think .75/.80 or something and threw the belt on the first dyno run.. Then low and behold it came into spec with the EXACT same amount of shims at .40...
Shardul feel free to elaborate, must have something to do with heating and cooling of the metal...
Shardul feel free to elaborate, must have something to do with heating and cooling of the metal...
05-07-2013, 05:18 PM
#49
MBWorld Fanatic!
In know when I got my pulley, which was one of the first the straps were made out of mild steel. Dave and I replaced them with the factory spring steel straps off of the OE pulley.
