I did the Series 5 T-o4E hybrid thing from Majestic. My other mods were two 720 cc secondaries, upgraded Fuel Pump, S-AFC, Profec B, 9.5# flywheel, K&N intake with a Mariah cold air box. Racing Beat Downpipe, presilancer and Apexi N-1 Cat-back.



I do not 1/4 mile - my car is set up for Autocross - BUT I did take it out for a test and tune to see what it would run. I turned a 13.08 running 10 PSI and dont know what I am doing. If your mods are similar and your a drag racer you'll see high 12's with that setup.

Just look at your sig. GET A BOOST CONTROLER!! It will make your car ramp up boost faster and higher. The turbo upgrade is awesome but will not shine until you do a boost controler. I prefer Profec B but there are others. Sell a kidney whatever you have to do just get a boost controler.

Help me to understand this. I thought a boost controller would only let you increase maximum boost. The ones I've looked at just delay the opening of the stock wastegate to a higher pressure.



How does the boost controller affect how quickly the boost comes up?

Anybody?

I am not going to get into a whole debate on the actual workings of the boost controler. I will tell you my observations from my own experiance.



With out a boost controler I would see peak boost at 6K RPM on up WITH the boost controler I would see peak boost at 3,500 RPM and it would stay there until redline.



When you have a boost controler your car will pull harder down low.



You will not regret it. Best money I ever spent and if I could do it over again it would have been my FIRST mod. Period.

i agree!



APEXI AVCR! best money spent on car. Other then buying car itself.

I'm not looking to debate anything, I just want to understand how it works. It is obvious to me that the act of opening or closing the wastegate can affect only the maximum boost level. What other means does a boost controller have to control boost? I would think that how quickly the turbo spools up would be defined by the actual turbine geometry, whcih is something the boost controller would not be able to vary.



For those of you with self-installed boost controllers, what does a boost controller consist of?

I didn't mean it as I do not want to argue with you 1988RedT2.



Everytime this subject comes up an argument brakes out over how they work.



I really dont care how they work other than how it feels when I drive my car. Is it faster with a boost controler? Yes much faster. Thats all that really matters. It makes your boost more constant over a wider RPM range.

Well, you can call me crazy if you like https://www.nopistons.com/forums/pub...1047683785.gif but I'd have a hard time coughing up the hundreds of bucks for a boost controller without having a clue as to how it would help me. And the butt dyno is not a very objective test method. Can anyone shed some light on what means a boost controller uses to control boost besides the wastegate?



I've read several product reviews and some of these controllers perform no better than a ball valve.



http://www.sportcompactcarweb.com/tech/020...boostcontrol08/

Let me see if I can shed a little light on this for you. We all agree that boost controllers work by changing the boost pressure to the turbo acctuator. Now think of it this way, your acctuator is controlled by a spring, and as any other type of metal it weakens over time. on and off boost puts a strain on the sping over time, and it just cannot hold the boost desired or hold the acctuator closed against the boost pressure being fed to it. In some cases a boost controller takes away the boost pressure from the spring, allowing it to work as it should and then meters the boost pressure according to how it is set. If Jims boost controller dropped his spool up that much, I would have to say he has a worn acctuator spring or the boost line was too big for the acctuator (or wastegate of which I am not sure of his setup).



So yes, there is a possibility that a boost controller can lower boost peak levels, but it is becasue the unit is not feeding the same boost pressure against the spring anymore.



Hope this makes sense to you.