New Rotrex C38R Supercharger

tiller · 03-27-2019, 09:19 AM

Quote:

Originally Posted by phunk

We made the first returns for the 370z and make frequent improvements any time we can. The kits are very comprehensive, please take a look at our website. As mentioned, the billet top hat is a very desirable upgrade as well. If you have any questions about it please email me at sales@cj-motorsports.com

hey phunk, iam gona need the flex fuel adapter set for my hat i think, switching to e85 this season, are they in stock?

phunk · 03-27-2019, 10:11 AM

Quote:

Originally Posted by tiller

hey phunk, iam gona need the flex fuel adapter set for my hat i think, switching to e85 this season, are they in stock?

Yup they are always in stock

jefftang04 · 04-07-2019, 10:29 PM

Quote:

Originally Posted by jefftang04

Hi Guys.

Latest updates. I maxed out my fuel injectors (550cc) at 400whp mainline at 5200rpm. Because of the increase in boost (7psi to 12 psi at 5200rpm) and my fuel pressure dropping to 40psi, injectors are max out. I'm going to get DW 1000cc in.

Also I'm thinking of getting a fuel return system on the car. What do you guys think. It's troublesome but I'm not sure if I can get away without one.

Thanks.

Sent from my ONEPLUS A5000 using Tapatalk

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

batboyvaj · 04-07-2019, 10:44 PM

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

What kind of dyno are you using? The numbers seem really low. Do you have baseline numbers from that dyno?

Spooler · 04-07-2019, 11:24 PM

Quote:

Originally Posted by batboyvaj

What kind of dyno are you using? The numbers seem really low. Do you have baseline numbers from that dyno?

That is a mainline dyno. Multiply by at least 1.1 to get dynojet numbers. Some are even off as high as 1.17. So between 518hp/551hp for dynojet numbers that you are use to.

Spooler · 04-07-2019, 11:26 PM

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

Get a fuel return system quick before something bad happens.

Jinxx · 04-07-2019, 11:37 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 ?

SS_Firehawk · 04-08-2019, 07:57 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, 11:42 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, 01:12 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

tiller · 04-17-2019, 09:08 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

Sent from my ONEPLUS A5000 using Tapatalk

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

Z eliminator · 04-18-2019, 11:19 AM

is this with the upgrades SC?

Z

tiller · 04-20-2019, 10:11 PM

Quote:

Originally Posted by Z eliminator

is this with the upgrades SC?

Z

Yes this is with the new rotrex c38R

jefftang04 · 04-24-2019, 04:25 AM

Quote:

Originally Posted by tiller

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

50kgm

scope22 · 04-24-2019, 08:14 AM

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

04-07-2019, 11:37 PM	#127 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3375	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 11:54 PM.

04-08-2019, 07:57 AM	#128 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	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, 11:19 AM	#132 (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	is this with the upgrades SC? Z __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

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