Gabor Cseh

Hi, Need some advice...

Help me to choose between JWT camshafts please!
My car is a ‘03 Nissan 350Z - VQ35DE 280hp ( non revup ). It has already a plenum spacer, stillen headers following a full open single race exhaust. It has also K&N dropin filters and a custom remap but otherwise stock engine, stock intake, stock throttle body... It’s important that it is a RACECAR only , I’m racing in the national time attack series, so 100% track use ( using rpm range from 4500 - 7000 ). I would like to buy a set of cams which give me some power for this rpm range. I dont want to build the engine so prefered cams which working well with stock internals and heads.

S1 ? S2 ? C2? C8? Am I think right, that the C8 cams would be the best choice for me ?? Are they still work well on the stock heads / stock pistons, without any clearing issues? Just need a set of JWT springs, and go ?

Thanks!

bealljk

iTrader: (13)

do you have any power restrictions?

I'd research what Sasha / On Point did on his build - obviously you're not looking to go as far as he did but quite possibly the most intelligent VQ builder/tuner the car has seen.

I'd also give JWT a call because they'll know best. It may be the C8 but there may be a better / more balanced cam that'll do more for you. Eitherway, they'll know best.

I'd also factor in tuning after you've installed these cams.

Gabor Cseh

For the current weight ( 1310kg fully loaded ) I can run up to 360 hp ( at the crank ). Its around 300 whp.

Are the C8 works perfectly with the stock pistons and heads? Yes I know that a remap will be neccessary after installing them.

jellofuel

I'm running the C8 cams in my n/a build. I have 3 track events under my belt now. (HPDE)

I have Z1 Motorsport's stage 2 heads with these cams, head work, and JWT springs. My bottom end is all stock except for the Nismo oil pump. If you want to rev to 7k or more, you will want to upgrade to revup oil pump, as a bare minimum.

If you want to make power at 7k, or even past that, then you will need significant port work on the lower plenum. You can do what I did, and swap in the Revup lower plenum, or if you have the money, Kinetix Velocity manifold. Or even a one-off custom manifold.

With your setup, if all you do is swap in the C8 cams, with no other supporting mods, you can expect to make around 290 whp. I made 300 whp with full bolt on's.

I have a dyno video here with dyno sheet. Power drops off after 6200 rpm due to non-revup lower plenum. After the dyno, I swapped in the revup lower plenum, added a velocity stack and 6" filter to the intake, and also, port & polished the upper plenum to mirror finish. And a Stillen ground kit for whatever difference that will make.

First, a WARNING for headset users... this is quite loud! Also, feel free to ask any questions you have at all. The only reason I would stop typing is because my fingers hurt. lol

bealljk

iTrader: (13)

what did you tune with? how's your idle with the C8? port & polish on the lower plenum - did you do anything to the manifold?

Good stuff!

jellofuel

Thanks! Z1 tunes with Uprev. The idle is very smooth. I filmed this the other day, after my recent projects were completed. You can watch the full video if you want, it's just Stillen ground kit install tips, and a quick review.

Looks like you need to skip to 3:04 of the video here

CK_32

iTrader: (1)

Save your money for a supercharger or something cheap FI.

You get most of that 300whp from a good tune. Most guys with breather mods on DE's get around 265-280whp from a tune. That leaves you 30-20hp for $1,200 + install with cams.

DE's are terrible NA if you are trying to go for power. They love FI. HR's on the other hand are NA beasts and gain crazy numbers for NA.

Again I vote heavily for save that $1,000 and invest it into a super charger or cheap TT kit.

bealljk

iTrader: (13)

^I bet OP is limited to an NA engine.

I've 'heard' the opposite ... the VQ is much better NA engine than a FI engine all things considered...and...with that being said, any engine is going to improve with a little forced induction.

Compared to a JZ, EJ , 4G/4B or LS, the VQ (IMO) doesnt do as well ... and this is coming from a guy who loves his VQ and will keel over in his grave before an LS is dropped in his z.

interested in what youre thinking and/or others have to say...

jellofuel

To address this specifically, I haven't personally driven an FI z, however I love the immediate throttle response of my z. My last track day was spent wondering whether I'd cooked the fluid in the rear diff, and not chasing boost leaks. For track duty, N/A is the way to go.

03threefiftyz

iTrader: (25)

I run a C8/C2 combo in my DE race car. It makes more than 300whp...considerable more, actually.

06platinumG

iTrader: (1)

you running that combo NA or with a SC

bealljk

iTrader: (13)

Probably NA if he is making in the 300hp range.

06platinumG

iTrader: (1)

Well he said "considerably more" and I know he has added an SC but don't know if he is referring to before or after

03threefiftyz

iTrader: (25)

My car hasn't been run with the supercharger this year. It's gone. I do have good breather mods and have spent 100's of dyno runs optimizing intakes, etc...but yes, it makes well north of the 300whp.

Chinky4U

C8 IN C2 EX? I saw your thread awhile back but couldn't remrmber the complete build.

03threefiftyz

iTrader: (25)

Yes. I don't think I have posted anything about that part of the build on this forum.

RENFRO

iTrader: (1)

I'd say something around the 272/10.5 range for specs. I run Tomei cams and springs on a stock bottom end, nismo oil pump, kinetix velocity, nwp throttle body, admin 3.5" intake, GT-R injectors, walbro 255, momentum headers, motordyne tdx2, z1 clutch/flywheel, and a decent plethora of other supporting mods.

Made 304whp/280wtq with stock heads (other than the cams/springs) all the way to right at 7800rpm without any dropoff hardly at all.

RobPhoboS

Is there much difference between the C8 272 cams and the Tomei's 272 (I know the lift is different but I'm not entirely sure on how that plays out).
Cheers for any insight !

EDIT:
Well, I bought the C8's - hopefully arriving next week for my Christmas engine refresh.

sherm3721

Off to the tuner for an attitude adjustment

RobPhoboS

I'm off to the tuner on Monday ! (with the C8's as well)
Good luck