Topgunz ROTREX C38R Supercharger Kit

TopgunZ · 03-08-2021, 09:19 AM

I think he meant that nobody has ran the C38R to see what it is capable of compared to the V3 Si which is used on 99% of the new supercharger builds.

Also, the older GTM rotrex kits were designed completely different from what we are doing here.

theDreamer · 03-08-2021, 11:33 AM

Quote:

Originally Posted by TopgunZ

I think he meant that nobody has ran the C38R to see what it is capable of compared to the V3 Si which is used on 99% of the new supercharger builds.

Also, the older GTM rotrex kits were designed completely different from what we are doing here.

I will be curious how you are going to be ‘completely’ different, mounting a SC with a belt and running pipe in our engine bay is very limited. Even with most TT kits the design is fairly similar you really just get option between turbo type & intercooler. The big changes come in fuel delivery, tuning, and engine build.

I think the 350z guys got the C38R into a few builds and saw some fairly positive builds, I think with the 370z you either had the GTM kit already and not much sense in an upgrade or waiting to see if someone builds a new kit with Rotrex.

Overall this should do wonders for the 370z FI folks, now we have a real viable SC option with some modern updates, with plenty of TT, and of course BP for T.

TopgunZ · 03-08-2021, 12:50 PM

Quote:

Originally Posted by theDreamer

I will be curious how you are going to be ‘completely’ different, mounting a SC with a belt and running pipe in our engine bay is very limited. Even with most TT kits the design is fairly similar you really just get option between turbo type & intercooler. The big changes come in fuel delivery, tuning, and engine build.

I think the 350z guys got the C38R into a few builds and saw some fairly positive builds, I think with the 370z you either had the GTM kit already and not much sense in an upgrade or waiting to see if someone builds a new kit with Rotrex.

Overall this should do wonders for the 370z FI folks, now we have a real viable SC option with some modern updates, with plenty of TT, and of course BP for T.

GTM used the C38-91 as a max blower. They mounted the SC down under the manifolds with the filter so close it would actually melt, meaning it would ingest a ton of heat. The improved version which moved the filter away took some harsh bends in order to do so which as we all know restricts power.

How many 350z guys can you show me that made the swap to a C38R-112? I know of one and he gained 5psi with the same belt setup and harsh charge piping. He was running a pulley setup that was initially designed around an 81 and not a 112. They designed their kits with looking stock before performance so they had to smash a small intercooler inbetween the factory crash bar and the radiator shroud so it is undersized for these newer power levels....etc..

theDreamer · 03-08-2021, 02:23 PM

Quote:

Originally Posted by TopgunZ

GTM used the C38-91 as a max blower. They mounted the SC down under the manifolds with the filter so close it would actually melt, meaning it would ingest a ton of heat. The improved version which moved the filter away took some harsh bends in order to do so which as we all know restricts power.

How many 350z guys can you show me that made the swap to a C38R-112? I know of one and he gained 5psi with the same belt setup and harsh charge piping. He was running a pulley setup that was initially designed around an 81 and not a 112. They designed their kits with looking stock before performance so they had to smash a small intercooler inbetween the factory crash bar and the radiator shroud so it is undersized for these newer power levels....etc..

Actually, the terrible bends were part of the stage 1 kit, I had the original and it was a terrible design. The move away from that into a straighter pipe and the filter under the exhaust manifold was the compromise so higher boost to be reached. Not sure who has had a melted filter or intake issues but curious on that one, been running the 1.5 kit with the straighter pipe for many years with intake temps 5-8 above ambient in Texas summer with no issues.

Just like this forum I keep an eye on the 350z side and read up on all the builds I can find, not saying they were magical numbers made, just that the 350z guys got into the C38R already.

I never said you were producing this for high numbers, that was directed at another user here. I am happy to see another shot with a supercharger with the Rotrex because I think it provides the best power band for our car and real gains. The original response was with someone saying the 370z has not seen a Rotrex tested on this car, which it has for many builds with high success. Just as you said, in the early 2010 days 500whp was crazy high so the early SC folks hit 400-450whp and stopped and very few went after the high numbers until you brought a real kit (Stillen with A2A) to market.

TopgunZ · 03-08-2021, 03:04 PM

Quote:

Originally Posted by theDreamer

Actually, the terrible bends were part of the stage 1 kit, I had the original and it was a terrible design. The move away from that into a straighter pipe and the filter under the exhaust manifold was the compromise so higher boost to be reached. Not sure who has had a melted filter or intake issues but curious on that one, been running the 1.5 kit with the straighter pipe for many years with intake temps 5-8 above ambient in Texas summer with no issues.

Just like this forum I keep an eye on the 350z side and read up on all the builds I can find, not saying they were magical numbers made, just that the 350z guys got into the C38R already.

I never said you were producing this for high numbers, that was directed at another user here. I am happy to see another shot with a supercharger with the Rotrex because I think it provides the best power band for our car and real gains. The original response was with someone saying the 370z has not seen a Rotrex tested on this car, which it has for many builds with high success. Just as you said, in the early 2010 days 500whp was crazy high so the early SC folks hit 400-450whp and stopped and very few went after the high numbers until you brought a real kit (Stillen with A2A) to market.

Here is one instance of a melted filter which you replied to.
Supercharger air filter replacement

Again, there is only one guy (that I have ever seen) that tried the C38R on the 350Z and he seen a 5.2psi gain on a pulley and intercooled system designed for a much smaller head unit. It was goatofrafin.

theDreamer · 03-08-2021, 03:26 PM

Quote:

Originally Posted by TopgunZ

Here is one instance of a melted filter which you replied to.
Supercharger air filter replacement

Again, there is only one guy (that I have ever seen) that tried the C38R on the 350Z and he seen a 5.2psi gain on a pulley and intercooled system designed for a much smaller head unit. It was goatofrafin.

I am looking forward to your results.

03-08-2021, 09:19 AM	#1 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	I think he meant that nobody has ran the C38R to see what it is capable of compared to the V3 Si which is used on 99% of the new supercharger builds. Also, the older GTM rotrex kits were designed completely different from what we are doing here. Elmo370z and redondoaveb like this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

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Topgunz ROTREX C38R Supercharger Kit