2G, 14b, boost

[Kakoriat]

I was thinking about picking up a 14B cheap to replace my T-ToSmall on my 95 TSi AWD. If I just put a 14B in the car without doing anything to the fuel system, what would be a safe boost lvl to run at? My plan is to run about 15-17psi depending on what I do. Do I need a fuel pressure regulator and a new fuel pump to run at this lvl of boost? Any suggestions would be greatly appreciated.

 

[Enraged78]

Originally posted by Kakoriat
I was thinking about picking up a 14B cheap to replace my T-ToSmall on my 95 TSi AWD. If I just put a 14B in the car without doing anything to the fuel system, what would be a safe boost lvl to run at? My plan is to run about 15-17psi depending on what I do. Do I need a fuel pressure regulator and a new fuel pump to run at this lvl of boost? Any suggestions would be greatly appreciated.

Without a datalogger, it's not very easy to tell exactly what the safe amount of boost you can run is. Ideally, you should tune the car for timing advance, EGT and O2. You want at least 18 degrees advance in third at redline, and around .92 O2 voltage in the same gear/RPM. I would suggest that you run 13-14PSI at the very most until you get a fuel pump re-wire and a datalogger. You really should be considering an upgraded fuel pump as well. Once you do the datalogger, pump and re-wire, it's possible to run up to 18PSI on 94 octane. However, every car is different. My car is happy with 17PSI, .94 volts and 21+ degrees of timing at 7KRPM in third (see my mod list for details). Play it safe, and don't run over 13-14 until you get the stuff you need. The car WILL be noticably faster than your T-25 @ 17PSI. Remember, it's not always about boost, but CFM's, and the T-25 is a 250CFM turbo, while the 14b is a 420CFM. That's 41% more air that's entering the engine at the same amount of boost.

Later,
Matt.

 

[jpolizo]

Originally posted by Enraged78
Remember, it's not always about boost, but CFM's, and the T-25 is a 250CFM turbo, while the 14b is a 420CFM. That's 41% more air that's entering the engine at the same amount of boost.

Just want to second the notion of being real careful with fuel. You obviously can't put in 41% more air without putting in 41% more fuel. Enraged78 has said it ... get a datalogger or something that will tell you what's going on in your engine.

 

[Kakoriat]

Ah yes I understand, less boost will still feel like more b/c the T-25 has such a low CFM. I plan on picking up a Datalogger in the near future too, I'll make sure to get it before I get the 14B. Thanks.