Topgunz ROTREX C38R Supercharger Kit

Mr.K · 12-05-2021, 07:03 PM

Has anyone done any comprehensive reviews/videos on the new Rotrex kit on its own and compared to other supercharger kits on the market for the 370z?

SeeThruHead · 12-17-2021, 10:41 AM

Quote:

Originally Posted by Mr.K

Has anyone done any comprehensive reviews/videos on the new Rotrex kit on its own and compared to other supercharger kits on the market for the 370z?

i don't think so but "thecarizon" on youtube has plans to upgrade his ace to rotrex last i checked. his videos are the most in depth (as far as DIY home garage style videos go) on the Z on youtube. So should be a good video series.

TopgunZ · 12-17-2021, 12:10 PM

Quote:

Originally Posted by Mr.K

Has anyone done any comprehensive reviews/videos on the new Rotrex kit on its own and compared to other supercharger kits on the market for the 370z?

Just take a look at the dyno graphs vs the competition. These Rotrex kits are making way more power throughout the entire low and mid rpm range. Pretty easy comparison on what car will be faster.

Even at 10psi these Rotrex kits make more mid range power than other kits at 15psi and comparative peak numbers at the same psi. The Rotrex also obviously has much higher peak potential up to whatever power you're comfortable running.

Mr.K · 12-17-2021, 02:03 PM

Quote:

Originally Posted by SeeThruHead

i don't think so but "thecarizon" on youtube has plans to upgrade his ace to rotrex last i checked. his videos are the most in depth (as far as DIY home garage style videos go) on the Z on youtube. So should be a good video series.

I have been following his channel but it doesn't look like he is getting the kit anytime soon.

Quote:

Originally Posted by TopgunZ

Just take a look at the dyno graphs vs the competition. These Rotrex kits are making way more power throughout the entire low and mid rpm range. Pretty easy comparison on what car will be faster.

Even at 10psi these Rotrex kits make more mid range power than other kits at 15psi and comparative peak numbers at the same psi. The Rotrex also obviously has much higher peak potential up to whatever power you're comfortable running.

That is true, I've noticed after comparing multiple dynos of different kits your new kit has a powerband that is strikingly similar to that of your typical VQ turbo setup with the exception that one is obviously lag free. I would just like to hear feedback on how the new vs. older setups feel in comparison. Would be interesting to see how this kit responds to pulley mods.

TopgunZ · 12-17-2021, 03:19 PM

Quote:

Originally Posted by Mr.K

I have been following his channel but it doesn't look like he is getting the kit anytime soon.

That is true, I've noticed after comparing multiple dynos of different kits your new kit has a powerband that is strikingly similar to that of your typical VQ turbo setup with the exception that one is obviously lag free. I would just like to hear feedback on how the new vs. older setups feel in comparison. Would be interesting to see how this kit responds to pulley mods.

When looking at those turbo graphs do you notice how the tq drops off hard up top? I found it interesting to see how the Rotrex holds the TQ.

And in my previous post I was talking about Superchargers when I said "other kits". But comparing it to turbos is fun too.

Mr.K · 12-17-2021, 05:47 PM

Quote:

Originally Posted by TopgunZ

When looking at those turbo graphs do you notice how the tq drops off hard up top? I found it interesting to see how the Rotrex holds the TQ.

And in my previous post I was talking about Superchargers when I said "other kits". But comparing it to turbos is fun too.

Sorry I forgot to mention I was comparing between 3-5k RPMs the way it ramps up but the supercharger having more area under curve around 2K because it doesn't ramp up as harshly as the turbo. Definitely, considering the turbos are appropriately sized the supercharger holds its ground better up top

. Honestly that was the main selling point for me, prior to your kit I was leaning towards a turbo oriented setup but seeing how your kit was the best of both worlds it was clear to me which one was better

.

TopgunZ · 12-17-2021, 08:23 PM

Quote:

Originally Posted by Mr.K

Sorry I forgot to mention I was comparing between 3-5k RPMs the way it ramps up but the supercharger having more area under curve around 2K because it doesn't ramp up as harshly as the turbo. Definitely, considering the turbos are appropriately sized the supercharger holds its ground better up top

. Honestly that was the main selling point for me, prior to your kit I was leaning towards a turbo oriented setup but seeing how your kit was the best of both worlds it was clear to me which one was better

.

This is great to hear. Glad the 100s of hours getting this system dialed in and fitting 10lbs of shiz in a 5lb bucket is worth it. These imports are hell in the bay. My turbo raptor was like working around an empty pool.

Did you guys know I have to remove and machine every Rotrex compressor cover just to get it to fit? That's the kind of spacial constraints I was against here. I also machine/bore out every inlet to make sure the intake is as capable as possible. It's hard to explain but it's the little things that matter.

Mr.K · 12-17-2021, 08:50 PM

Quote:

Originally Posted by TopgunZ

This is great to hear. Glad the 100s of hours getting this system dialed in and fitting 10lbs of shiz in a 5lb bucket is worth it. These imports are hell in the bay. My turbo raptor was like working around an empty pool.

Did you guys know I have to remove and machine every Rotrex compressor cover just to get it to fit? That's the kind of spacial constraints I was against here. I also machine/bore out every inlet to make sure the intake is as capable as possible. It's hard to explain but it's the little things that matter.

Seriously man your kit is living up to the hype

. And that's so true, the engine bays are super cramped, another reason why going TT would've been a nightmare for servicing

. That's the type of dedication and determination that we as a community appreciate

. Would love to hear all the little changes that went into this kit!

GrayGhost · 12-17-2021, 10:58 PM

Quote:

Originally Posted by Mr.K

Sorry I forgot to mention I was comparing between 3-5k RPMs the way it ramps up but the supercharger having more area under curve around 2K because it doesn't ramp up as harshly as the turbo. Definitely, considering the turbos are appropriately sized the supercharger holds its ground better up top

. Honestly that was the main selling point for me, prior to your kit I was leaning towards a turbo oriented setup but seeing how your kit was the best of both worlds it was clear to me which one was better

.

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.

Sent from my iPhone using Tapatalk

Mr.K · 12-17-2021, 11:45 PM

Quote:

Originally Posted by 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.

Sent from my iPhone using Tapatalk

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.

redondoaveb · 12-17-2021, 05:00 PM

Quote:

Originally Posted by TopgunZ

Just take a look at the dyno graphs vs the competition. These Rotrex kits are making way more power throughout the entire low and mid rpm range. Pretty easy comparison on what car will be faster.

Even at 10psi these Rotrex kits make more mid range power than other kits at 15psi and comparative peak numbers at the same psi. The Rotrex also obviously has much higher peak potential up to whatever power you're comfortable running.

Hey Aaron, can you post up the comparison dyno graphs. It would be great to see them posted here.

TopgunZ · 12-17-2021, 09:16 PM

Quote:

Originally Posted by redondoaveb

Hey Aaron, can you post up the comparison dyno graphs. It would be great to see them posted here.

That's kind of tricky to do because I get called out for "company shaming".. lol. But there's a site with a Version 2 kit that has a graph to check out. Then take a look at the graphs here or on my website. I think page 20 has a good one.

redondoaveb · 12-17-2021, 09:24 PM

Quote:

Originally Posted by TopgunZ

That's kind of tricky to do because I get called out for "company shaming".. lol. But there's a site with a Version 2 kit that has a graph to check out. Then take a look at the graphs here or on my website. I think page 20 has a good one.

I understand. It's just a pain in butt searching for others because I think they're mostly posted on Facebook. Are there others of your Rotrex kit that you can post on here.

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12-05-2021, 07:03 PM	#1 (permalink)
Mr.K Base Member Join Date: Mar 2021 Location: California Posts: 79 Drives: 2017 370z Nismo Rep Power: 6	Has anyone done any comprehensive reviews/videos on the new Rotrex kit on its own and compared to other supercharger kits on the market for the 370z?

***Topgunz ROTREX C38R Supercharger Kit***

Topgunz ROTREX C38R Supercharger Kit