sub'd

And why?
Yes you could but why...unicorns could also fart raindows....

Keep us posted!!!

I contacted a rep that was on there US sales board, nothing as of yet, I’ll post in here as soon as there’s news.

It's my chart and you are reading it correct.

Hi All,

I just recieved My C38R unit. Will be replacing the C38-81 on my GTM Stage 1.5 kit in February.

Currently I'm doing 450whp and 380lbft at 10PSI. Will update with results once the system is running.

a few points:
1) The inlet is 3.5" as compared to 2.5' for the C38-81
2) From my calculations current C38-81 is drawing 80+ HP at peak (85mm pulley)
3) If you were to run the C38R at peak rpm it will draw up to 130hp. This will affect the pulley system requirements. currently my system is running 8PK instead of the
stock 7pk. Still, it barely meets the needs of 130hp. i believe 10pk would be needed to maintain the same belt change interval.
4) The C38R (7:1) has a different gear ratio as compared to the C38-81 (6:1) ratio so the pulley size will definitely change.
5) Because of the pressure ratio (assuming rest of the system is the same) IAT will increase by about 25degC so upgrading IC might be unavoidable.

Thanks all

I’m stoked someone actually got one, I was starting to wonder if these were ever gonna ship! I didn’t realize the inlet was larger though, I’m guessing you’ll have to get a new intake tube?

Will have to custom the intake tube.

Good to hear there actually getting out to customers, have they said when there gona be available for anyone to purchase?I’ve been waiting on info for awhile as iam thinking about upgrading my rotrex on my gtm stage 2 kit.

What was the final cost if you don’t mind me asking? I believe the c38-91 that is on my car is already 3” inlet.

Keep me posted thanks

The gtm stage 2 kit has a 3 inch pipe with a 4 inch velocity stack

Yes your right.

Where’s the rest of the people that were on the pre order list, the suspense is killing me to find out more about this unit.

I kinda wish I still had my GTM supercharger kit ...but I sold the 2015 nismo..and sold the kit off it ....still pushing the 2017 nismo with the turbo tho ....having 2 Zs was with both kits made it hard to choose which to keep lol

Ya my z with that sc kit on it is a great all around car, converting it to e85 this year, but I really want to see how this c38r performs, I think at 17lbs of boost on a Mildly built motor on e85 should put down some good usable numbers.

I loved my Z with the supercharger kit on it .....but the turbo Z was a whole other animal ...made the supercharger seem very tame

It's almost 3k Euros for the complete kit with coolers reservior plumbing etc.

Sorry it is 3.5" not 3". I corrected my post.

Thanks

Ya I was told the c38r will work on existing sc kits out there, I already have the c38-91 installed on my z, so I just need the pump itself, keep us posted on what changes you had to make and the performance of this unit, lbs of boost etc, this pump could determine wether I sell my kit or not, if I can get 17lbs out of this unit that be perfect.

The charge cooler definitely needs an upgrade. The gtm one most prob will be to limited.

Next would be the serpentine belt. Are you still on stock 7pk? Min it should be 8pk and even that's a stretch. 10pk would be perfect.

can't wait for some results, i'm on 1.5 gtm kit, would love to see 15+lb of boost

Have you found a 10pk that fits your gtm? Doubt there is one, I haven’t had any issue so far with the belt on my kit with c38-91, and it’s maxed out ,but I always keep a spare with me.

I'm currently on 8pk. Had to custom most of the pulleys. But it was worth it as the belt is able to last much longer now.

The belt wrap is like 80% so there isn’t much chance of slip ....you can also get a belt a little shorter from any parts store to get more tension

Hi, my problem is not with the slip. Its with the longevity of the belt.

Cheers

Keep us posted on your progress with the unit and install , very interested. Thanks

Hi guys, the new Intercooler is in. Now I'm working on the new SC cooling system as well as charge piping.

Currently I sized the pulley to achieve 80k SC rpm at 7500 engine rpm. I made another pulley for 90k SC rpm, we'll see how it goes when the car is on the Dyno.

Should be done by this week. Hopefully can start tuning by this weekend.

I'm excited too.

Do you have a pic of new intercooler? curious on how much bigger you went, intercooler in the stage 2 sc kit works great with the FI tow bar installed on the c38-91 maxed out.

im running the treadstone trtt9 intercooler. this is the same intercoooler that comes in the BP kits. its a tight fit, but an easy modification to the gtm sc.

This is the one I bought.

TRTT9 Intercooler Twin Turbo Intercooler- TREADSTONE PERFORMANCE

But after fitting I found that I can afford an additional 2" taller core size.

Cheers

cool,checked the site out,looks good,what all did you have to mod to fit this intercooler? post a pic of it done if you can.

There you gohttps://uploads.tapatalk-cdn.com/201...74bd080d98.jpg

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upper 2 inlets and bottom charge inlet same size as piping that comes in the original gtm kit? throttle body pipes still come thru stock intake pipe location with this new intercooler? sorry for all the questions,just tough to tell in pic

Hope this helpshttps://uploads.tapatalk-cdn.com/201...39f9ec0343.jpg

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You said you made your own sc pulleys, roughly how many mm, 90? Cuz 85mm would max it out also, we figured that to be roughly 18lbs of boost, how many lbs will you be on the dyno?

Hi, The new C38R has a different ratio (6:1) as compared to C38-91 (7.5:1). Hence C38R will require a smaller pulley to achieve the same impeller speed. Im currently on 82mm pulley. This will give my 80k SC rpm at 7500 engine rpm. For it to achieve 90k SC rpm, the pulley will have to be 73mm, which is a bit smaller than what rotrex recommend as the smallest allowable pulley size.

I have yet to dyno the car yet. will keep you guys updated.

Thanks

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.

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For sure your gona need a fuel return system at 12lbs, I’d recommend cj motor sports, thats what I installed on my z, plus the aluminum fuel hat from cj also. Your gona need a fuel pump relay kit (spal kit)also if you don’t already have one.
You might even want to upgrade your fuel pump while your in there, walbro 450maybe, especially if your gona be going higher then 12lbs of boost, not sure what your using right now for a pump? Or fuel?

I used Bosch ev650cc injectors at 12lbs but iam switching to e85 this year so Id1050s now.

If you go with the return system you could prolly still use the 550 injectors and tune with increased fuel pressure to cover the extra 2500 rpms... you should be around 15-16 lbs of boost at 7500 rpm

My Fuel Pump Now is DW 300, Fuel is 98 octane

Looks like im going with a return system.

so CJM is the way to go?

Thanks

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

That isn't even a question. I've got the top hat and the S1.SE return system, you will not be disappointed.:tup: