New Rotrex C38R Supercharger

Jinxx · 03-08-2018, 12:52 PM

Quote:

Originally Posted by tiller

around $2750 for the c38r unit not $700, if it was $700 I would have ordered 4 of them, iam waiting on more test results before I pull the trigger. but I do know my c38-91 is a great unit already, and jinnxx, we can get a few more pounds of boost out of them now to, ill let you know how it works out, iam gona be the guinee pig for this test and ill post how it goes.

Are you looking at trying to change the impeller on the c38 to get a few more lbs of boost ...I was looking at that myself ..but needed a backup plan if I trashed the unit....back up plan being a c38r lol

tiller · 03-08-2018, 02:40 PM

Quote:

Originally Posted by Jinxx

Are you looking at trying to change the impeller on the c38 to get a few more lbs of boost ...I was looking at that myself ..but needed a backup plan if I trashed the unit....back up plan being a c38r lol

No, got 80mm pulley, 85mm is close to maxing our sc, but I did all the math and by bringing the cars redline to approx 7k I should be fine, that be close to 15lbs of boost or more, I don’t redline my car a lot And like to make as much torque as early as possible, with ecutek tuning it’s a simple trial, if not Just switch back to 85mm.

Some added jwt cams, flywheel, clutch etc etc will contribute also

And then wait for c38r result so cuz you all know I’ll get it know matter what

Jinxx · 03-07-2018, 09:48 PM

Quote:

Originally Posted by TopgunZ

Or...which blower will make more power. In this case the V7 would. Don't get me wrong, the c38r looks pretty sweet and has huge potential in the right application. For anyone with the gtm kit that can get it for under $700 it's the no brainerest of no brainers to me. I mean, used c38s sell for that. I can't imagine they will be sold at that price though.

I would agree the v7 would be capable of more power .... but I wouldn’t say it would make more power at the same boost level. If both blowers are running 10 lbs boost I would say the c38 is a better choice .... more efficient 97% vs 78%... higher rpm 90k vs 66k ... now if you need more boost than 12pbs then the v7 would be the way to go .... the c38r should run higher than 12lbs ... I would say 16 ish.

overtureZ · 03-08-2018, 08:39 AM

Lets get a bracket CNC'd for the V7 now Topz and call it your stage 2 kit

cupcakez · 03-08-2018, 09:33 AM

Hahahaha.
Do it!!!!!

overtureZ · 03-08-2018, 10:42 AM

He has most the items needed just need a v7 and a CNC guy now.

cupcakez · 03-08-2018, 11:32 AM

Quote:

Originally Posted by overtureZ

He has most the items needed just need a v7 and a CNC guy now.

What!!!!
If I knew that I would have instead bought a v7 ysi head unit and sent it to him if he could find a CNC person xD and help him start up a v7 packaged kit T__T

TopgunZ · 03-08-2018, 11:51 AM

Milkcow500 (Justin) was my second customer and on a G37 sedan. He is trying the V7. Havent got an update in a couple of weeks though.

Jinxx · 03-08-2018, 03:15 PM

You might want to recheck your math .....85mm puts you just over 90k at 7k rpm

tiller · 03-08-2018, 03:44 PM

Quote:

Originally Posted by Jinxx

You might want to recheck your math .....85mm puts you just over 90k at 7k rpm

With the 85mm my redline is Just under 7500, not overspinning at all, I do all my logs that I send to seb and motor cuts out 74k n some change, I’ll get it on a dyno as soon as it’s retuned , spoke with techs at rotrex and kraftwerksusa where I got the pulley, said should be fine at 7k redline, guess I will find out lol

tiller · 03-08-2018, 04:00 PM

Jinxx it’s a win win either way, the pulley works And I make a little more power or I destroy the sc unit and get the c38r , don’t see the down side do you?

TopgunZ · 03-08-2018, 04:16 PM

The down side could be contamination. If your supercharger chews itself up and metal debris and shavings get into the oil system you could have big problems. This unit is direct fed and not self contained, correct?

Just like the guys that say.. Well if my engine goes then Ill just rebuild the bottom end with new pistons and rods so Its not that bad. Well, my engine went when I was Turbo'ed back in the day and took out the crank, both heads and left a window in the block so I needed an entire new Long block. Cost went way up.

tiller · 03-08-2018, 06:10 PM

Quote:

Originally Posted by TopgunZ

The down side could be contamination. If your supercharger chews itself up and metal debris and shavings get into the oil system you could have big problems. This unit is direct fed and not self contained, correct?

Just like the guys that say.. Well if my engine goes then Ill just rebuild the bottom end with new pistons and rods so Its not that bad. Well, my engine went when I was Turbo'ed back in the day and took out the crank, both heads and left a window in the block so I needed an entire new Long block. Cost went way up.

Oh sorry forgot to mention the long block sitting on the engine stand next to my z in garage out of a crashed z

See when I do something I do it big and push the limits to see how much I can get out of whichever system, turbo, sc , etc wether it’s thought by some to Be the best or the worst, I try everything and push all parts, let’s just call it life experiences

SS_Firehawk · 03-08-2018, 05:17 PM

Oil system of the Retrex is usually self contained with it's own heat exchanger.

Jinxx · 03-08-2018, 06:03 PM

88mm supercharger pulley

This is a chart on impeller speed calculation...last time I talked to rotrex they confirmed the calculation as well .....and that is why GTM wouldn’t sell a pulley under 86mm

The 84mm is at 91280 at 7k rpm......a 80 mm would put you over 100k ...
Also TOPGUN is correct ..if you blow the supercharger you could damage much more than just the bottom end .. we all take that risk when boosting but ....I wouldn’t go that far over specs on a blower

I might be reading the charts wrong soooo ......im still not sure

03-08-2018, 08:39 AM	#4 (permalink)
overtureZ Enthusiast Member Join Date: Dec 2015 Location: Middle TN Age: 32 Posts: 319 Drives: Da Boosted Z Rep Power: 11	Lets get a bracket CNC'd for the V7 now Topz and call it your stage 2 kit wideglideleon and cupcakez like this. __________________ Auto/Z Enthusiast - Mechanical Engineer - Fabricator - Do it for dale

03-08-2018, 10:42 AM	#6 (permalink)
overtureZ Enthusiast Member Join Date: Dec 2015 Location: Middle TN Age: 32 Posts: 319 Drives: Da Boosted Z Rep Power: 11	He has most the items needed just need a v7 and a CNC guy now. __________________ Auto/Z Enthusiast - Mechanical Engineer - Fabricator - Do it for dale

03-08-2018, 11:51 AM	#8 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	Milkcow500 (Justin) was my second customer and on a G37 sedan. He is trying the V7. Havent got an update in a couple of weeks though. cupcakez likes this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

03-08-2018, 04:16 PM	#12 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	The down side could be contamination. If your supercharger chews itself up and metal debris and shavings get into the oil system you could have big problems. This unit is direct fed and not self contained, correct? Just like the guys that say.. Well if my engine goes then Ill just rebuild the bottom end with new pistons and rods so Its not that bad. Well, my engine went when I was Turbo'ed back in the day and took out the crank, both heads and left a window in the block so I needed an entire new Long block. Cost went way up. overtureZ likes this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM Last edited by TopgunZ; 03-08-2018 at 04:19 PM.

03-08-2018, 05:17 PM	#14 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Oil system of the Retrex is usually self contained with it's own heat exchanger. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

03-08-2018, 09:33 AM	#5 (permalink)
cupcakez Track Member Join Date: Oct 2017 Location: California Posts: 635 Drives: 2009-7AT-Base-Coup Rep Power: 4837	Hahahaha. Do it!!!!!

03-08-2018, 03:15 PM	#9 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3377	You might want to recheck your math .....85mm puts you just over 90k at 7k rpm

03-08-2018, 04:00 PM	#11 (permalink)
tiller Enthusiast Member Join Date: Feb 2011 Location: ontario Posts: 370 Drives: 09 370z touring Rep Power: 16	Jinxx it’s a win win either way, the pulley works And I make a little more power or I destroy the sc unit and get the c38r , don’t see the down side do you?

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