***Topgunz ROTREX C38R Supercharger Kit***

GrayGhost

I think a great thing to emphasize about the topgunz kit as to why you are seeing more area under the curve is because the unique ability to bleed off excess boost especially when the original pulley that comes with the kit is sized to almost max out the blower. If this kit can hit 20psi by redline and you set it to 10psi, then you will hit 10psi by about midrange and theoretically you could keep a flat torque curve to redline. So this kit at 10psi will definitely look different than other kits at 10psi, unless the other kit it also running a 20psi pulley on a blower that could support that amount of flow but its limited to 10psi somehow.

Point being, out of the box it is definitely superior to other out of the box kits. (although with throwing a bunch of additional stuff to other kits, you could see similar graphs) and because of that feature it will look more like a turbo graph, yet be more predictable as you build boost.


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Mr.K

I might be going out on a limb here so Aaron can chime in if I'm wrong but superchargers really only differ in the top half end when raising boost and that goes for all superchargers on this platform. If you look at the graphs on page 20 you can see that up to about 4.5k they are the same despite differing in PSI. This goes for other kits that I've noticed as well including Stillen, SOHO, etc. The biggest difference is really going to come down to the choice and type of blower which was the Rotrex C38R and the way the kit was set up. You won't see anything similar with other kits despite throwing everything at them (pulley mods, impeller mods, A2A conversions, etc.) because the powerband is on a whole different level.

TopgunZ

Actually the reason all 3 psi levels are equal up to high mid range is solely due to our unique operation of bleeding boost.

The 10psi map would normally not make 10psi until 7500rpm and therefore have lower numbers throughout. Yet here we see that the 10psi hangs with the 17psi power wise until the bov opens at 10psi somewhere around 4.5k where the other higher boost maps starting climbing away.

So 10psi on this kit will always have a better looking graph than another centrifugal charger at 10psi because we see all that boost ramp in the mid range instead of not getting to 10 until 7500.

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Mr.K

So essentially the blowers are pushed hard until the BOV opens at their respective boost levels? Would we be able to play with this further if we wanted to push the graph to the left even further?

14Q60awdSPORT

This isn't 100% exact, but still a good illustration of what is happening and comparing the different boost "maps" Also added a typical TT for comparison.

A traditional "normal" centrifugal SC setup will choose a pulley for desired max psi IE 10 psi pulley will make 10 psi at 7500rpm, but only about 4.5psi at 3.5k rpm.

The topgunz kit will make about 23psi at 7500rpm, letting it make 10psi at 3.5k rpm. if you targeted 10psi the entire time you would bleed off through the BOV the excess boost over 10psi, so at 7500rpm you would be bleeding off about 13psi. your boost would follow the orange line until it hit the green line then follow the green line to redline.

at 3.5k rpm you are making 5.5psi more vs a traditional centrifugal SC setup which will result in a lot more torque/power in the mid range.

or compare orange to green following green vs the blue line, all the area in between those lines is the extra boost you are making through the entire curve despite both setups making 10psi peak.

and then you obviously have way more headroom to turn up the topgunz kit if desired without needing pulling changes.

Attached Images

Boost Comparison.PNG (47.2 KB, 43 views)