RJ MFG Supercharger kit Feeler...

Jordo!

As I understand it, a cog system -- if its well designed -- should be fine. Whipple's statement is probably based on what they have factory tested and are willing to guarantee.

Now the more more you overdrive it, the more strain on the blower's internals, so if these come stock with a V belt or synchronous set up, people who try to up the boost probably switch to a cog system, and that may or may not cause overload issues separate from, but magnified by, a high efficiency cog set up.

On any blower, belt stretch, pulley warping, and damaged internals can happen as load increases, and the likelihood of that increases a lot as you increase the RPMs the blower turns at, so Whipple may just be sticking to the specs they have in print for a given blower, rather than panning a different set-up entirely.

Or am I on the wrong track here?

Bullitt, can you weigh in on this?

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bullitt5897

Whipple's concern is in regards to their snouts. Given that a cog belt has dramatically less slip there testing and I quote from Mike himself 15 years ago was not good for longevity. Now again this testing was done 15 years ago... their policy is to not recommend a cog setup based on that data period. But since it is a concern for people rj mfg has is taking the time to design at least an 8 rib setup.

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Jordo!

Okay -- I see. Yeah, cog systems have less slip, so more efficient and more torque, but also more load on everything including the snout (and probably the crank...).

Doesn't sound like an insurmountable problem, tho'.

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bullitt5897

It's not...

But at the same time I know the guys at RJ MFG just want to sell kits and if people are hesitant about cog that could lead to less sales... they can get the same traction with an 8 or 10 rib setup. So I think that's the route they will go... cog has a lot of benefits but reliability is one of the number one items about this kit.

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Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054

TopgunZ

Why not just have an optional COG setup? Wouldnt it just be 3 pullies and a belt?

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bullitt5897

That's not off the table... from the last development meeting they stated they are going to work on a serpentine setup for the street guys since that is 90% of the market. Cog will most likely come later.

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Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054

RJ MFG

Small Update:

Due to the concern over the cog vs serpentine wear on the supercharger snout. We have elected to stock all the stage 1 kits with an 8 rib serpentine setup. The reason for 8 rib should be obvious as it will allow users to run higher boosts without having to change idlers and crank pulley. Again we are designing the kit to run a separate belt from your main belt in the instance of a failure of the blower belt you aren't stranded.

In addition to that we should have final design renders here in the coming days. There have been a lot of fine tuning behind the scenes to make sure this thing fits like a glove.

Sorry for the delays in updates

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Elmo370z

Can i come by the shop to check this out

Jayhovah

I'd come and take a look too

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RJ MFG

Right now we have our 3d printer, spare motor and everything at one of our engineers homes so that they can work into the after hours on it. As soon as we have the finalized design we will post up. Also we are in the middle of moving into our new space. Once we are settled we will have a big open house. I would expect it to follow Zdayz. Until then we are heads down on completing orders, moving and designing new products for the VQ and new VR platform.

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shadow85

Yup I asked this a while back in another thread. Nobody seems to know the answer, I even asked Level10 but did not get a reply on this.

I think people do not care because there are already bulletproof 7AT options available if you got the $$$.

bullitt5897

These transmissions are $7k+ so you can buy an oem one for $7k+ or you can build yours for $5k...

Which is the better deal?

$7k+ and 400ftlbs limit
Or
$5k and 800+ftlbs limit

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Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054

Ape Factory

They're going for $7K used?

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shadow85

What Oem trans are you talking about costs $7K?