New Rotrex C38R Supercharger

Jinxx · 04-07-2019, 10:37 PM

Those numbers are very very low ..even without the fuel return ..40psi with 1000cc injectors is still a lot of flow for 14lbs of boost ......I was at 522whp at 12.5 lbs with 93 oct fuel with the stage 2 kit with 650cc ...I was planning to add the methanol kit and would have been around 575whp ish ....what fuel are you running ...91oct?....93oct?.... or e85 ?

tiller · 04-17-2019, 08:08 AM

Quote:

Originally Posted by jefftang04

Hi guys. Final numbers are out.

471whp on mainline Dyno
HP gain is about 50whp throughout from 5k rpm to 7.5k rpm. Below that is about 20 to 30whp.
14psi of boost at 7500rpm
IAT at peak is 54 DegC
DW 1000cc injectors at 85% duty cycle at peak
No fuel return.......YET........
Fuel pressure at peak is 40PSI. Too low in my books

Cheers guys

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hey, what was your torque # at 14 psi on the dyno?

jefftang04 · 04-24-2019, 03:25 AM

Quote:

Originally Posted by tiller

hey, what was your torque # at 14 psi on the dyno?

50kgm

tiller · 04-26-2019, 08:24 AM

Quote:

Originally Posted by jefftang04

Hi guys. Final numbers are out.

471whp on mainline Dyno
HP gain is about 50whp throughout from 5k rpm to 7.5k rpm. Below that is about 20 to 30whp.
14psi of boost at 7500rpm
IAT at peak is 54 DegC
DW 1000cc injectors at 85% duty cycle at peak
No fuel return.......YET........
Fuel pressure at peak is 40PSI. Too low in my books

Cheers guys.

Sent from my ONEPLUS A5000 using Tapatalk

Are you putting your car back on the dyno after fuel system upgrade? also did the new sc unit bolt up to existing sc bracket without any mods?

jefftang04 · 05-08-2019, 01:31 AM

Quote:

Originally Posted by tiller

Are you putting your car back on the dyno after fuel system upgrade? also did the new sc unit bolt up to existing sc bracket without any mods?

Yes it bolts up the same. But the intake is 3.5" instead of 3"

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tiller · 06-05-2019, 05:24 AM

Quote:

Originally Posted by jefftang04

Yes it bolts up the same. But the intake is 3.5" instead of 3"

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have you put the car back on the dyno yet after fuel upgrade ?

SS_Firehawk · 04-08-2019, 06:57 AM

Fuel needs to be at 51psi. Your stock fuel pressure regulator isn't keeping up. Definitely need to switch to a return style. I highly recommend you buy a complete fuel return kit and not piece it together. It's an *** pain. Charles (Phunk) at CJM is my lone recommendation

Elmo370z · 04-08-2019, 10:42 AM

Quote:

Originally Posted by SS_Firehawk

Fuel needs to be at 51psi. Your stock fuel pressure regulator isn't keeping up. Definitely need to switch to a return style. I highly recommend you buy a complete fuel return kit and not piece it together. It's an *** pain. Charles (Phunk) at CJM is my lone recommendation

Mmmm... no one ever listen to me

Jinxx · 04-08-2019, 12:12 PM

Quote:

Originally Posted by SS_Firehawk

Fuel needs to be at 51psi. Your stock fuel pressure regulator isn't keeping up. Definitely need to switch to a return style. I highly recommend you buy a complete fuel return kit and not piece it together. It's an *** pain. Charles (Phunk) at CJM is my lone recommendation

Stock fuel pressure is at 51 ... but any kit that isn’t using a fuel return will see pressure drop .. and is made up with duty cycle ... and I agree a return system should be installed but 40 psi with 1000cc injectors at 85-90% duty cycle should still support 14-15 lbs boost

Z eliminator · 04-18-2019, 10:19 AM

is this with the upgrades SC?

Z

tiller · 04-20-2019, 09:11 PM

Quote:

Originally Posted by Z eliminator

is this with the upgrades SC?

Z

Yes this is with the new rotrex c38R

scope22 · 04-24-2019, 07:14 AM

What did the SC cost you? i see they're about 3K here and there...

jefftang04 · 04-25-2019, 07:29 PM

Quote:

Originally Posted by scope22

What did the SC cost you? i see they're about 3K here and there...

Yes that's about right.

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fryzia23 · 02-04-2023, 07:49 AM

bump an old thread, I need to to replace my charger and on the fence whether to go with the R or stick with C38-81 or 91

Averying · 02-04-2023, 11:54 AM

Quote:

Originally Posted by fryzia23

bump an old thread, I need to to replace my charger and on the fence whether to go with the R or stick with C38-81 or 91

Which kit do you have? If it’s stage 1 u prob won’t get more boost out of a better supercharger unit.

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04-07-2019, 10:37 PM	#1 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3377	Those numbers are very very low ..even without the fuel return ..40psi with 1000cc injectors is still a lot of flow for 14lbs of boost ......I was at 522whp at 12.5 lbs with 93 oct fuel with the stage 2 kit with 650cc ...I was planning to add the methanol kit and would have been around 575whp ish ....what fuel are you running ...91oct?....93oct?.... or e85 ? Last edited by Jinxx; 04-07-2019 at 10:54 PM.

04-08-2019, 06:57 AM	#7 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Fuel needs to be at 51psi. Your stock fuel pressure regulator isn't keeping up. Definitely need to switch to a return style. I highly recommend you buy a complete fuel return kit and not piece it together. It's an * pain. Charles (Phunk) at CJM is my lone recommendation wideglideleon and turtle64b like this. __________________ Old Car:GTM TSC'd** 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

04-18-2019, 10:19 AM	#10 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,660 Drives: 370 Z 7AT Sports Rep Power: 20	is this with the upgrades SC? Z __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

02-04-2023, 07:49 AM	#14 (permalink)
fryzia23 Enthusiast Member Join Date: Dec 2010 Location: new jersey Posts: 452 Drives: 2011 MB 370Z NISMO Rep Power: 1247	bump an old thread, I need to to replace my charger and on the fence whether to go with the R or stick with C38-81 or 91 Noahpalermo likes this.

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04-24-2019, 07:14 AM	#12 (permalink)
scope22 A True Z Fanatic Join Date: Apr 2012 Location: Roswell, GA Posts: 1,179 Drives: wife crazy Rep Power: 57	What did the SC cost you? i see they're about 3K here and there...

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