Hello, I was just wondering how do I hold Higer PSI levels on turbos. For example, what do I need besides a better fuel management system, and great tuning. Also, how come turbo kits can produce more power then others at the same PSI, eventhough they have the same setups. Is it just a matter of tuning?

 

Oh yea, I also forgot to mention, is higher PSI the only thing that will make the "psshhhhhhhht" sound of the BOV loud?

 

I'll take a stab at this. The sound from the BOV varies depending on the brand. I've heard that some are louder than others.

It's been estimated that a Ralliart can handle around 12-15 psi reliably on stock internals. To get higher boost, you'd be looking at beefing up your engine (rods and pistons.)

Exact setups can put out different amounts of power depending on tuning and environment. I'm assuming you mean the same kit on the same engine. One kit might be tuned a bit rich and moderate on the timing for safety, while another may be tuned a bit more lean with more agressive timing for more power. Also, a car at sea level is going to make more power than a car at 7,000 feet above sea level due to the higher atmosphere having thinner air.

 

thanks. That answered all of my questions flawlessly. Thanks a lot. As for the psi, are you certin that the ralliart as stock can handle 12 to 15 psi with a bold on turbo kit and good tuning?

 

I wouldn't say anyone is certain. If it were my car, I wouldn't go above 10PSI

 

yeah im not goin about 8-9 with my stock internals until i upgrade internals

 

What do i have to change to run higher PSI safely? I want to run about 13 to 15 PSI, but I don't know what internals to get. I want the min, because my goal is to SAVE money.

 

well it is sorta hard to save money right now, and for internals you would hqave to get custom pistons and rods and that will cost you alot and then after that there are other thins you can upgrade

 

wat kind of turbo set-up do u have right now? not many boosting ralliarts our there so i was just wondering.

 

with a maf (mass air flow) in our cars you are going to need a recycling type bov which bleeds the air else where, only when you have cars that have map system will you get the phsss sound.and going over 12-15 psi does anyone know what the mivec cam is going to do, you need to retard your timing. untill someone has taken their motor to a higher psi level and proven what the stock engine can handle it's all here say

 

im guessing you have the essential speed setup, given your location and the nature of ur questions =) If this is the case, they are running a kit /w as little elecronics as possible. as others have noted, you can boost the car to about 6psi on stock timing and fuel management. Above that, you will have to retime the injection and ignition. if you get around 10psi, you will also have to increase the fuel supply at both the pump and injectors. Here is what you will need that others have used:

e-managed to adjust sensors values used for timing, like a/f ratio and MAP
turbo specialties injector interface kit to adjust injection
turbosmart boost control
larger fuel pump
larger injectors. i belive the WRX injectors might be compatable. check that befor you blow your cash on them!

as mentioned, the stock internals can probably hold 12psi safely. i would get new rods and pistons to go any higher. for pistons, call ROSS. They made the ones for TTPR and may still have the designs on file to save you some cash. Call Crowler for the rods. same story.

to get up to speed, read this thread:
https://www.evolutionm.net/forums/sh...5&page=1&pp=15

pages 10-20 are the most interesting, especially ivano's posts.

 

you want to run PSI SAFELY.... theres no such thing as minimum for saving money.. if you want safety... and by safety im guessing you dont want your block to go BOOM!!! do ya? if not, theres no minimum.

 

Also, if you upgrade your pistons/rods, you might as well upgrade your headstuds while you've got the head off.

 

well i dont have all the turbo components yet, i will soon and i will take pics, but i am buying APEX s-afc and tune my car with that until i can get it to the dyno, it should be fine just using that, and im using the stock ecu also until i get a new managment system, which wont be for a while. The s-afc is like a tunable piggy back system.

 

i dont think anyone has proven 12psi safe on stock internals. ive gone like 4k miles on my car set at 8psi. so there u go, and its running like a champ.