I've been saving up since the first group buy but missed out. I've waited for a deal or sale to come by but no luck till now. Kraftwerks is having a 15% off free shipping so I might as well jump on that deal. But I would like the community with the KW SC to have their input. I was going to go with the upgraded blower for just 300 more it seems like a no brainer to get. I've heard all great things about kraftwerks c38-81 blower kit. Also my brother has a kit on his 9th gen civic for a year so I know it's reliable. But I kind of want the upgraded blower c38-91 but i seen and hear that a few members have their pulley or bolt breaking in half? Is it from the c38-91 kit only that's having the problem?. Has anyone have a nice reliable 91 blower. I'm having mix reviews so I might just get the c38-81 if it's more reliable.

 

It's not the blower itself that is breaking that bolt because it attaches to the hub adapter on the back. Mine broke on my 91 blower, but a member on here has broken 3-4 bolts on his 81 blower. You are making the right move by going with the 91 though. The 81 is kind of maxed right from the start. The 91 gives you a little more wiggle room to play with. Plus for only $300 more, it's definitely a no brainer like you said. I love my setup and the fact that I went with the 91. It's unfortunate that I had that bolt issue, but when you introduce 2x the power to something you are bound to have some type of issue or another.

 

Or there is always the SOS option, which has no reliability issues what so ever, upgrading from the standard 1220 to the 1200 blower is $40 = 50-75whp

 

So is the bolt a easy fix and instant repair or it had to be sent back to get it replace? Thats the part I'm confused on. For the people that has the bolts broken is it a faulty bolt or is the kit making to much power to do that.

 

Looks like SOS increased it to $65. In my case, it's about +130whp

 

Yes, it's an easy fix, however when I had my issue I had to send the blower back to have it inspected to make sure no damage had occurred to it. Then Kraftwerks put a new bolt on. You could install a bolt yourself if they sent it to you, but there is a special tool that would need to be made in order for you to do it. I know this because they sent my installer the blueprints to it. However, for liability and warranty purposes I preferred that Kraftwerks do it because if something like that were to happen again down the line, I don't want to be blamed that I did something wrong installing it.

The exact cause of the failure has not yet been determined, but CJ has said in another thread that their R&D team is looking into it. Some think belt tension is to blame others say it could come from over spinning the SC unit, or hitting the rev limiter.

 

Yes, it's an easy fix, however when I had my issue I had to send the blower back to have it inspected to make sure no damage had occurred to it. Then Kraftwerks put a new bolt on. You could install a bolt yourself if they sent it to you, but there is a special tool that would need to be made in order for you to do it. I know this because they sent my installer the blueprints to it. However, for liability and warranty purposes I preferred that Kraftwerks do it because if something like that were to happen again down the line, I don't want to be blamed that I did something wrong installing it.

The exact cause of the failure has not yet been determined, but CJ has said in another thread that their R&D team is looking into it. Some think belt tension is to blame others say it could come from over spinning the SC unit, or hitting the rev limiter.
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For the benefit of the community, could you share the blueprint for that special tool?

 

Until they figure it out, why don't they just include the highest grade bolt possible? I have my new kit in a box and don't want to install it (since it's my daily car right now) until this has been figured out in one form or another.

 

The extra few hundred for the upgraded blower is definitely worth it in my opinion. Overall we've seen these kits be reliable. For those that have experienced trouble Kraftwerks has responded quickly to their needs. It's still a relatively new system so there are small things to work out as with any new product.

We have awesome pricing on these kits for those that are interested. Feel free to PM me.

 

Habit, I was never given the blueprints specifically to design the tool, my installer was. However, if my guess is correct, it is probably the tool on Rotrex's website in the Technical Handbook PDF. http://www.rotrex.com/Home/Technolog...Technical_Data

If you skip to page 30 of 37, it shows the pulley removal tool and some dimensions for it. I'm guessing this is the tool that my installer was going to have to fabricate if he wanted to remove the pulley and bolt correctly.