I'm about to pull the trigger on a Vortec S/C. I've been considering getting the 8lb pulley just to be on the safe side.

As you may know, I have the Crawford headers, plenum and h/f cats and the JIC Y-PIPE but kept the stock exhaust from there back. What I'm wondering is if this more free flowing exhaust will actually HURT my boost or my performance? Should I expect the 8lb pulley to produce 8lbs of boost with these mods? Originally I thought that these mods would help me create MORE hp/tq at lower boost levels, so that when I was boosting at 8psi, I would get another 20rwhp or so. After reading many threads I'm confused as to what the affect of having all of these mods on will be. Will my boost be at 8psi and my hp/tq be higher than a Vortec on a stock G or will my boost be at say 6.8 psi and my hp/tq be equivalent to a Vortec on a stock G?

Any advice would be appreciated.

 

If I remember right if you lower your backpressure you will LOWER your boost. This is because without backpressure there is less restrictions, so your system will hold less boost. But, keep in mind, that psi isn't really that important, what really matters is how much air is flowing in to the combustion chamber. Your boost guage may read slightly lower, but with a free flowing intake/exhaust system you will be moving more air then a stock setup, so you can expect that 20whp gain.

 

When I first did the Vortech kit I was confused about this too but after reading some threads over on my350 I have realized that it is still a benefit to have a free flowing exhaust. You will be boosting less PSI wise but yet the same amount of air will be going through your engine so you will still have benefits Hp wise. But you will have to tune it and not keep the factory to get the full benefit and not lose HP. So you will benefit from having lower pressure in the engine but still have that extra HP.

 

With these mods you will need a tune.

 

I'm sure Neffster already knows he will need a custom tune for his car, as his number one goal is safety, with maximum power.

 

Oh, and Todd, I still have my Procharger for sale! I'm sure it would love to meet up with my old headers and cats!

The procharger, with the right tune, is a better all around kit then the Votech I still believe. Throw a Split Second box on the Procharger like Grubbs has been doing, and you'll hit close to 400whp I bet

 

So to recap...

I will need a tune and I will still be able to get the 8lb pulley to give me the stock vortech boost amounts and then I'll be able to add another 20 or so rwhp on top of what a normal Vortec S/C set up yields? This means a normal Vortech tune is ~370rwhp (on a dynojet), so I may actually see 385+ rwhp with my mods?

I got a GREAT DEAL in the works for a FI-Group buy of sorts. I'm sticking with Vortech for now, thanks for the offer Kevin.

I definitely plan on getting the system tuned as soon as it's installed. I'm not sure if I'll be going whole hog with gauges, plugs, oil cooler, etc... either way, the tune is 100% in the plan.

BTW, the wife gave me approval to move forward today at Mc Donalds. Now I don't regret doing 7 loads of laundry, vacuuming, sweeping, changing all of the bed sheets, cleaning both bathrooms, the showers and tubs, toilets, etc... All in exchange for a S/C. It's times like these that remind me why I married her.

 

^^ LOL. One day when I get married the hubby is expected to be doing all that, and buy me a Vortech on top of that. And he better not take me to McDonalds Anyway congrats, haha.

 

Come-on we all know a Big-Mac is the quickest way in your pants!

 

Confirmed. Expect ~6.5 psi and about 385-400rwhp according to the distributor with the 3.33 and my current set up. If I get brave and get the 9lb pulley he said I can expect 420rwhp easy with the Crawford Package.

 

for the money and gains, you should just go with aps or turbonetics

 

well you wouldnt say that if you looked at the price on the APS, haha. im not sure how cheap the turbonetics kits go for? afaik it isnt tuneable though, you need to send your ecu for reflash, and install is more of a PITA. correct me if im wrong.

 

With the stock pulley Im at 375hp with all my mods. But Im about to change the to the 9lb pulley

 

Hey tig how much was your aps kit?

 

I considered it briefly thanks to the suggestions by sflg35, gurgen, gman, djniknala, oldvfrguy, etc...

Bottom line... I've never had a S/C or ST (or even a TT) car before. I've never had a car as fast as the G before. 370+ rwhp at higher rpm's is PLENTY FAST ENOUGH FOR ME. The reliability is what I'm looking for and now that I have the inside scoop on NISMO rebadging a Vortech S/C and offering it through NISSAN, I think I'm making the right decision for me.