08-16 Velocity Stacks

I developed these stacks for my own CBR1000RR engined race car to provide strong peak power without throwing away loads of mid range, having ran them myself along with a few of my fellow competitors I'm now comfortable offering them here.

The stock stacks are weak at the top end and tend to fall off/ run out of puff. These pull hard to the limiter as well as providing an overall smooth curve providing everything else is optimised and mapped accordingly. A lot of the aftermarket stacks are very short and only run well right at the last 2000rpm.

This is a Dyno curve from a stock engine with full exhaust and my stacks, otherwise standard (UK model)





I can offer these for £200 Inc post/packing and will provide fitting instructions. This makes them a very competitively priced alternative to everything else out there and as they take a long time to make, and took a long time to design, I can't justify doing them for less.

Any questions please fire away.

 

ABS?

 

Nope, 95A shore TPU. Massively better vibration resistance.

 

You disagreed with a question?
Interesting you went with TPU. I would have thought it was too soft.

 

Not sure what you're getting at, you asked a question and I answered it??

95A TPU is only semi flexible, it's not soft at all. Especially not with a significant amount of infill and wall thickness.

I tried some out of ASA which is similar to ABS and found them a bit brittle. I could make them out of Nylon/carbon blend but it's quite a bit more costly in materials.

 

I asked ABS? And you clicked disagree. Semantically does not make sense. Those buttons mean something else.

 

Oh did I? Haha. Fat fingers.. didn't mean to.

 

Undone..

 

As a 3D designer/maker myself I was curious about the choice of materials. I have used TPU 95 and 85 for a few things, I find 85 a good goto for makeshift grommets, and 95 I’ve used for under mirror blanking plates for the Ducati.

 

Have you ever tried Nylon? I bought a small reel of strimmer line to experiment with, but haven’t found the time yet.

 

I really like the 95A TPU as it is so strong, massive layer adhesion and vibration resistant. It made it the safer choice for me as I was concerned about the brittle ASA/ABS breaking up and being ingested by the engine... Yikes! The only downside is how much slower it is to print

 

I've tried nylon with carbon fibre esun filament, it prints quite nicely but it is imperative to keep it dry. I have been running it out of a filament dryer at 70degrees.

 

I think it is one of the most hygroscobic printing materials.

 

You still make these ?