Hey fella's, I just noticed this the other day. On my stock setup my boost gauge reads 10 psi around 7k rpm. Passengers have told me I hit 10 but I'm too busy paying attention to the road to look. I figured it was just the angle they were seeing the gauge at. So I gunned it and looked myself, sure enough I hit 10psi right before i shift out. Do you think I am really hitting 10 psi or is the gauge reading wrong?

i've heard that on vtech kits with the alternative pulley. . .

The Vortech blow off valve is a preset 10 pound unit that usually varies from 8-10 pounds from what I've seen. Other variances in intake and exhaust mods change boost pressure too (usually they drop if done after the SC unit in the flow path). In short, you're fine and you have a good bypass valve...

10-4 Thanks alot!

I can't beleive that duratec's handle 10# of boost, most cars can only handle 5-7psi on stock guts, good to see the ole duratec is a tough ole mule!

man, I'm kinda itchin to see what kind of boost I'll hit with the other pulley? I probablly won't do it though, I have a feeling I'm on the threshold of blowing something up as it is.

what is your current pulley size, and what were you thinking of changing it to???

hmmmmmmm, talking about boost

Originally posted by BStoneMega:

---

man, I'm kinda itchin to see what kind of boost I'll hit with the other pulley? I probablly won't do it though, I have a feeling I'm on the threshold of blowing something up as it is.

---

The smaller pullies will not get you more boost unless your bypass is faulty, allowing higher than the 10 psi it's preset at. The smaller pulley will just bring on the boost sooner in the RPM range for your car. The smaller pullies can also be used to restore lost boost from adding things like an exhaust, ported intake or heads, or a 3L, etc... The most boost does not always mean the most power...

By the way, you're about 20-30 HP from being on the edge of a really serious 2.5 SVT. There have been several in the 295 range...

Originally posted by Faboo:

---

what is your current pulley size, and what were you thinking of changing it to???

hmmmmmmm, talking about boost

---

I don't even know what the pulley size is, whatever vortech gave me. I'm pretty sure there is a smaller one available though.

So Bnoon, are you saying a catback exaust may not give me as much power as it would on a N/A engine? Also when I do put on a cat back I could actually lose boost?

Originally posted by BStoneMega:

---

So Bnoon, are you saying a catback exaust may not give me as much power as it would on a N/A engine? Also when I do put on a cat back I could actually lose boost?

---

On the SVT cams there is a little overlap where the intake AND exhaust valves are open, what will happen is the boost will come in and go right out. If you have a free flowing exhaust it will go out easier and faster losing boost, if she's all bottled up then it will slow and you build more boost..simple explanation for a complicated process but you get the idea. Cat backs are always a good idea though.

You have the 3.33" 6-rib pulley and Vortech offers 3.125" (what I'm running my 3L) a 2.87" and a smaller one yet. You won't get any more boost unless you surpass the flow capabilies of that bosch bypass, then you'll get boost creep and it will creep up from 10psi. Run the 3.125" that will bring boost sooner and you won't out flow the bypass.

cool,I take it I can order up the 3.125" pulley from vortech and not run into any problems. That sounds good, I wonder why they don't give the smaller pulley in the first place?

So they get another $60 from you!

hahaha that makes sense.

Originally posted by BStoneMega:

---

So Bnoon, are you saying a catback exaust may not give me as much power as it would on a N/A engine? Also when I do put on a cat back I could actually lose boost?

---

No, that's not it at all... Even though the boost may go down, you're still gaining HP because your over all flow is going up. Boost is only airflow vs. restriction... Lower the restriction, boost goes down, but air flow can go up = HP goes up. Want more boost after removing a restriction, such as exhaust? Spin the SC faster to bring up the pressure ahead of the engine again. That's why Vortech gives you the smaller pulley to start with on a stock car, then sells you the smaller ones to bring the boost back up once the rest of the car is modded. Find the smaller pullies on Ebay for $20 or so...

wow...I really am learning quite a lot, You guys can really explain this stuff so a guy with little knowledge on cars can understand it. Thanks alot fellas, it feels good to get a non sarcastic, non bashing answer. Mucho gracias!

Originally posted by BStoneMega:

---

wow...I really am learning quite a lot, You guys can really explain this stuff so a guy with little knowledge on cars can understand it. Thanks alot fellas, it feels good to get a non sarcastic, non bashing answer. Mucho gracias!

---

[bashing&sarcasm]dude, muchas gracias...come on now..this is 2K2..ignorance isn't an option[/bashing&sarcasm] sorry...it's late

haha thanks for bringing me back!

You really are producing nice numbers from just a basic install. What exhaust system, are you mystery modded or not?

warmonger

I am running the stock svt exaust with a straight pipe in place of the resonator. Other than that the engine and exaust is stock. I'm not mystery modded, tell you the truth I don't even know what it is. I always thaught that my car produced slightly higher numbers than whats the norm. With just a bat intake and k&n filter I hit 174 hp. so the supercharger was bolt on 100 hp at the wheels, i was suprised at that too.

It does sound as if you have a factory freak of sorts, considering the Vortech claims of 254 at the wheels were with an aftermarket cat back on the car!!! How's it doing in the cooler winter air? That normally turns the Vortech into a monster!

Originally posted by bnoon:

---

It does sound as if you have a factory freak of sorts, considering the Vortech claims of 254 at the wheels were with an aftermarket cat back on the car!!! How's it doing in the cooler winter air? That normally turns the Vortech into a monster!

---

The little freak runs like a maniac! I get no traction at all, it'll roast em just pushing the gas first thru third gears with all the salt on the roads. I need the lsd bad before I try to get anymore power.