Hey guys I'm brand new here, just picked up a 2005 g35 with the vortech v-2 supercharger kit installed. It is the rev up kit and I am looking to make a little more power. My boost guage only shows I am making about 5-6psi is this normal?

I was looking to go either to a 2.87 pulley or change the cog setup ratio (unsure on setup would be best if changing the cog pulley sizes). I would rather just install a fuel pump and not really looking to upgrade injectors or change the ss box right now so which way would you guys recommend? I want to make close to 400whp.

 

your boost is low assuming you're still running the stock (3.12) revup pulley. where is your boost gauge getting its reading? have you noticed any leaks or loud squeals at WOT? what are your other mods?

the 2.87 should get you to your goal, but you're going to need larger injectors (440's at least) to get there safely. there is a bunch of information on your kit over on my350z in the forced induction forum.

 

I am running the stock 3.12 pulley I just checked that. I am not sure where the boost gauge is tapped in I will check that tonight.

I don't hear any leaks and no squealing from the belts or anything. I want to get the car tuned because I am unsure if or who did the tuning before and I thought I mine as well put a smaller pulley on to do that.

Can I change the cog pulley sizes without switching injectors?

 

if you're increasing boost then you'll more than likely need bigger injectors.

before you start spending money, i recommend you double check all the piping connections to make sure all the clamps are tight and sealed against the pipes. also, make sure the vacuum line between the bpv and intake (tuner kit) / FMU (full kit) hasn't come loose. make sure there's no oil in your piping as that could indicate a problem with the blower. after that, triple check everything again.

 

Checked everything out last night and my boost is around 7-8 now...what is the rev-up kit supposed to be at?

 

You should be near 9 to 10 lbs

But I really feel you need to go with bigger injectors as well as a new MAF and fuel pump to get 400+.

And get a new tune to dial it all in.

 

sorry, semi-thread jack and noob questions about S/C...

With a standard Vortech kit on the stock car, what's the natrual progression of upgrades/mods?

ie,
1) ECU tune
2) pulley upgrade
3) bigger injectors
4) etc...

 

^ start here: http://my350z.com/forum/forced-induc...questions.html

 

Great link! thanks for the heads up

 

Car is at the tuner I figured I would just get my stock kit tuned for now (I have a unichip piggy back system installed, that's not stock right?). And they are telling me to install Uprev and tune my stock vortech kit I need injectors, fuel pump, and different MAS. Anyone disagree?

 

I'm a relative noob to FI, so I'm going to share what I've learned so far. Anything outside of the full stock Vortech kit, you'll need to upgrade injectors. Natually, to get more power, you'll need to burn more fuel. And with the bigger injectors, you'll need an upgraded fuel pump to move the extra fuel. I'm not sure what the MAS is yet. Unless you're referring to Mass Airflow Sensor, which you might need cuz the OEM MAF sensor might not be able to handle correct readings for the increased air flow. Again, I'm a noob at this and I'm really just translating what I've read so far. A more seasoned FI member may need to jump in to confirm or deny.

Also, I'm still researching ECUs and difference between "piggybacking" vs "flashing" the OEM ECU. So I have no input about that.

 

http://www.350zmod.com/HPX-MAF-Senso...vq35demmaf.htm

 

if you have the stock, full kit installed (3.12 pulley, vortech FMU, and vortech SS box/unichip) then that's all you need to get tuned.

fuel pump comes in if you don't want to use the vortech FMU and/or want to go for more power. bigger injectors come in if you want to go for more power. upgraded MAF comes in if you want go increase boost (within its operating range, the base vortech tune and FMU don't care what the MAF is doing because they use intake manifold vacuum/boost to decide when to adjust fuel pressure). osiris comes in if you don't want to use the vortech SS box / unichip for tuning.

again, if you're fine with the 100% stock, full vortech kit and the stock power output, then you don't need the other stuff.

 

Thanks bigc that last post really made everything make sense for me now.

BIG UPDATE: When the tuner put my car on the dyno he said it was running really lean and that's what prompted all this upgrading. However I started ripping the stock vortech kit stuff out last night and realized the in-line fuel pump was not wired correctly!!! The fuse for the fuel pump was removed because the idiots who installed the kit must have wired it incorrectly and the pump stays on even when the ignition is off when the fuse installed.

Anyone have good pictures or detailed write up on how the pump gets wired in correctly?? I looked on vortech's instructions and it was confusing but I will try and see if I can figure it out tonight.

 

I recently installed the vortech complete kit on my 06 and when I had finished, my fuel pump too was running all the time with the ignition off. The instructions that come with the kit have a constant power from the battery through the fuse to the fuel relay and then down to the fuel pump. There is then a ground from the relay to the fuel pump, but I noticed that it also said in the instructions to run a small length of ground wire from the pump to the chassis. So now it was getting constant ground. Constant power and constant ground equals the pump running all the time. So I took off the ground from the pump to the chassis and just used the ground supplied by the fuel relay allowing the relay to send the signal to turn the pump on when its needed. Worked fine for me. Hope this helps.