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.

kromberg · 03-09-2021, 02:56 AM

Subscribed. Definitely interested. What do you think the timeframe will be for production?

TopgunZ · 03-09-2021, 08:10 AM

Quote:

Originally Posted by kromberg

Subscribed. Definitely interested. What do you think the timeframe will be for production?

We are planning to be on the Dyno next week. Then we will release it on our site. It will kind of depend on first come first serve basis at that point. I will update the site with expected ship dates as we go. I have a pretty good amount of parts showing up so I am hoping to minimize the waiting list.

SS_Firehawk · 03-09-2021, 11:36 AM

I had to clean the kit I bought because there was melted filter in the housing. I've been thinking of using some form off heat shield or reflective tape or something to prevent it.

TopgunZ · 03-09-2021, 12:28 PM

Quote:

Originally Posted by SS_Firehawk

I had to clean the kit I bought because there was melted filter in the housing. I've been thinking of using some form off heat shield or reflective tape or something to prevent it.

Facts....

Last time I checked, engines like cold air.

HapaZ · 03-12-2021, 10:54 AM

Can't wait Aaron! Thanks for continuing to develop your kit and looking forward to purchasing for my 40th birthday!

TopgunZ · 03-13-2021, 09:35 PM

Soon!

HOODEY · 03-20-2021, 09:32 AM

Its amazing it took so long for someone to come up with this solution. The key is the jack shaft pulley. Where can these be pulleys be sourced?

edub370 · 03-21-2021, 10:44 PM

Did this kit ever hit the rollers??

TopgunZ · 03-22-2021, 06:59 AM

Quote:

Originally Posted by edub370

Did this kit ever hit the rollers??

Still perfecting the casted aluminum section. I thought this would have been done a couple of weeks ago. I am now scheduled for next week.

Z eliminator · 03-22-2021, 09:02 AM

Question, would the blower fit on a gtm stage 2 kit

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

03-09-2021, 11:36 AM	#8 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	I had to clean the kit I bought because there was melted filter in the housing. I've been thinking of using some form off heat shield or reflective tape or something to prevent it. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

03-12-2021, 10:54 AM	#10 (permalink)
HapaZ Base Member Join Date: Sep 2014 Location: NorCal Posts: 246 Drives: 2012 370z Base Coupe Rep Power: 11	Can't wait Aaron! Thanks for continuing to develop your kit and looking forward to purchasing for my 40th birthday! TopgunZ likes this.

03-13-2021, 09:35 PM	#11 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	Soon! scratchdvinyl, Rusty, Optimiser and 5 others like this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

03-21-2021, 10:44 PM	#13 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	Did this kit ever hit the rollers?? __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

03-09-2021, 02:56 AM	#6 (permalink)
kromberg Base Member Join Date: Apr 2012 Location: Colorado Posts: 93 Drives: 2013 Nismo Rep Power: 14	Subscribed. Definitely interested. What do you think the timeframe will be for production?

03-20-2021, 09:32 AM	#12 (permalink)
HOODEY Base Member Join Date: Aug 2013 Location: Barbados Posts: 41 Drives: Uk spec 08 350z gt Rep Power: 12	Its amazing it took so long for someone to come up with this solution. The key is the jack shaft pulley. Where can these be pulleys be sourced?

03-22-2021, 09:02 AM	#15 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	Question, would the blower fit on a gtm stage 2 kit __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

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***Topgunz ROTREX C38R Supercharger Kit***

Topgunz ROTREX C38R Supercharger Kit