Supercharger belt length

[AMGeed]

The Gates 1289ES belt is supposed be OK for OEM pulley and the 84mm.
Gates 1275 for the 77mm pulley.

The OEM size Gates belt one is stocked here
Mister-Auto

 

[Cyclone1]

I used a Contitech Belt

Double checked and I used a Contitech belt for the 1275 I used for my 83mm pulley, then a Gates 1255 belt for when I changed to the 77mm pulley.

Either brand is fine.

Good thread here. Personally I would always go with a smaller belt if fitting an 83/77mm pulley. I know some of the suppliers and specialists say the standard belt is fine on an 83mm and in most instances it will be, but this assumes tensioners and other pulleys are functioning perfectly. To me it also makes sense to reduce the belt size to try and replicate the tension of the standard belt on a standard pulley. If the pulley size reduces then so should the belt size to compensate.

77mm Supercharger Pulley - MSL Dyno Test

 

[Merc55k]

Well, that’s my 83mm pulley knackered AGAIN after only 3 months and less than 2k miles.

After the last failure it took 3 months from reporting the issue to MSL, MSL returning it to eurocharged in the states, pulley re-built, sent back to me and the car back on the road. No explanation given, no apology for the inconvenience or costs incurred.

Thankfully MSL sent me an OEM pulley so I could get my car (which is my commuter) back on the roads so at least that was something...

Considering my own original OEM pulley was on from new and covered approx 92k miles with no issues, to say I’m disappointed is a fair understatement. Especially given the 3 month turnaround again.

How can these be so fragile?!? I really expected good things from eurocharged.

Acid gave me a 6 month warranty from receiving the re-built pulley, which given it was only 6 months after the first failure, I would say is only fair...... to be honest I would really expect a re-build following a failure to come with a fresh 1 year warranty as it should essentially be as good as new.

After only 3 months back on the road and another failure, I feel it would only be fair to reject a second re-build and ask for a replacement. Also the labour charges of getting pulleys switched over repeatedly are a bit of a pest...

Would really appreciate your thoughts?

Just on this belt / pulley conversation... my eurocharged 83mm pulley is knackered after 6 months / 4K miles. It has been running a standard belt (as advised by MSL). I’m just waiting on my pulley getting back to eurocharged for their evaluation to confirm a replacement based on premature failure. However, my belt is looking a bit tired and while the pulley work is ongoing I’m looking in to new belts. I’ve been on to a dealership to source a new belt but they are telling me there are two belts listed for the SC for my car

Sizes: 28.45 x 1289 and 21.36 x 2449

Anyone know which one is correct?

Or is there are any better options for an 83mm set up than standard?

I tend to trust MSL when it comes to things like this, but I know there are other options and would like to hear others experience.

Cheers
Neil

 

[AMGeed]

Mmm doesn't sound good. In your position I would ask MSL for refund and get an 83mm clutched pulley from DTK Motorsports, provided it is a different brand to the Eurocharged pulley (ASP?) One is bad luck, two, I'm not so sure.
DTK Motorsports

 

[Merc55k]

Mmm doesn't sound good. In your position I would ask MSL for refund and get an 83mm clutched pulley from DTK Motorsports, provided it is a different brand to the Eurocharged pulley (ASP?) One is bad luck, two, I'm not so sure.
DTK Motorsports

Acid just replied to me and tells me eurocharged have now stopped making the 83mm pulleys FFS lol some options might be quite limited...

 

[Cyclone1]

Have both pulleys failed with the same issue? What exactly failed with them?

Did you change the belt or use the same one? Is your tensioner operating properly?

I’m sure Acid will help you sort it.

As AMGeed has stated you can buy alternative 83mm pulleys from other suppliers. To be honest most of the main sellers probably buy them from the same manufacturer. Other option is a 77mm, but worth finding out why the 83 is failing first.

Jules

 

[AMGeed]

^ I agree with Jules, finding out why the second pulley has failed is pretty important if the next replacement isn't to go the same way.