Originally Posted by 350Z400rwhp

Mine starts spraying at 3-4psi and increases until it hits 100% at 10psi. The Snow Perf. Stage 2 is a progressive unit. My tuner also pulled a degree or two of timing. My air/fuel is 11.4 with meth off and 11.9-12 with meth on.

Originally Posted by z_333

I thought meth/water is suppose to make the engine run richer? I tried running my snow stage 2 kit on my car previously. I start at 4psi and end at 6psi. I notice when it start spraying, it gets about 0.4-0.5 A/F richer. Hence, there is more room to push for higher timing, or lean back some the fuel.

Originally Posted by 350Z400rwhp

It is more octane so you can run it leaner and still be safe. It will run richer if you just add it without compensation. I would ask your tuner what method they prefer. I had Tuan at GRD do mine and that's how he did it.

Originally Posted by Xendric

I have a 3.12 Vortech setup on my revup.
I'm using an Apexi midpipe and backbox, Vortech supplied intake, stock headers, cams and cats.
When I was doing my research before installing this, I read that compressors don't quite work like turbos - you need SOME backpressure for best results.
For this, most people were not suggesting true duals, so I followed this advice.

I also found out that the more free flowing your breathing is, the lowest your boost will be, all other things equal.

So, to sum up:
1) Bigger intake/exhaust will result in lower boost (good thing for your engine).
2) Superchargers need a little backpressure to maintain good low end torque.
3) You can upgrade to smaller diameter pulleys to keep same boost levels, which will in turn result in higher power numbers, but maybe lower tq.
4) Most people avoid true duals on SC installs.

My setup made 400whp using a Haltech Platinum ECU.

Originally Posted by z_333

Hi there,

Do you reckon my exhaust setup will be suitable for the additional boost? I'm only looking at 10psi using HKS SC kit. Its cammed with 8.5:1 compression ratio. I also did 3 angle cut on the valve seats. Would my exhaust which consist of impul headers, tomei test pipes, nismo Y-pipe, & muffler be ok?

Guys, i know I've been asking the same question over and over. Its never a bad thing to get more experienced SC'd Z owners to advise.

Originally Posted by z_333

I already have JWT S1 cams and impul headers. I just wanna find out if its efficient to use them on 10psi setup

Originally Posted by z_333

Hi there,

Do you reckon my exhaust setup will be suitable for the additional boost? I'm only looking at 10psi using HKS SC kit. Its cammed with 8.5:1 compression ratio. I also did 3 angle cut on the valve seats. Would my exhaust which consist of impul headers, tomei test pipes, nismo Y-pipe, & muffler be ok?

Guys, i know I've been asking the same question over and over. Its never a bad thing to get more experienced SC'd Z owners to advise.

Originally Posted by z_333

Are you using HKS SC kit as well? Would like to learn more about it from you.

Originally Posted by LaoSiFu

I couldn't really find too much people about it but why not the JWT S2 cams. I am just wondering about that. I am slowly building my way up to SC that is why and cams is the 2nd thing in my to do list

~Robert

Originally Posted by 350Z400rwhp

I would still get rid of the y-pipe and do a borla or some other true dual exhaust. I think the Borla is only 2.35" or something so it's still not super free flowing. I would go with 15+ psi with a built motor with that compression ratio. I'm at 11psi with the stock 10.3 compression ratio making 414whp and I still don't feel like my car is fast but am limited becaus eof having a stock block. Why don't you sell the HKS and get a Power Lab single turbo? I bet you could get a good amount of money for your supercharger.

Originally Posted by Xendric

I believe your exhaust setup would be more than enough, as is.
If you go for a more free flow setup, the boost will drop, given you keep the same pulleys - which isn't a bad thing of course, but you will get a hit in torque.

However, as suggested above, a low-comp, built motor can take much higher boost levels without any trouble, provided you have a good ECU and a competent tuner.
On my setup (Haltech Platinum coupled with one of the best tuners in my country), if I had a low compression built motor like you, I'd definitely go higher than 10psi. But if you want to play safe, then by all means keep it at 10psi, which isn't really 10, it would be 12ish on a stock exhaust system.