Which is better turbo and why oh and the evo has been ported and upgraded wastegat and flapper but they are the same price.

 

EVOIII 16G all the way, but the larger flapper is a downgrade IMO. Of course, it depends on what kinda boost and other mods you're sporting though.

 

Why is the larger flaper a downgrade without it the evo3 will have boost creep.

 

Well lets break it down...What does this bigger flapper do exactly? When you're getting plenty of boost your wastegate arm is actuated, and the flapper opens up to let out excess exhaust that would otherwise cause the turbo to spool even more (eventually overboosting the pee out of your turbo), soooooooo creep is when you get so much exhaust that it no matter how wide open the flapper is, you simply cannot vent the excess exhaust, and thus the turbo spins faster and makes more boost. Well the answer must be to get a bigger flapper then!!! That way when the wastegate is actuated there's a bigger escape hole for all the exhaust right? Well sure...... BUT... This is a great fix if you want a ROCK SOLID 12psi (or whatever low boost you want to run), but when you try and run high boost what happens then? You put in some racegas and now we're ready to run that 16G to 24psi!!!! Oh, wait, once you get going the turbo spools up, and the motor is makin' more power and creating more exhaust but now your wastegate actuates and you're letting out all that exhaust that you want to spool your turbo!

The bottom line is if you increase the size of that flapper, when the wastegate actuates it's letting out more than normal and thus limiting your "high boost" performance. A little creep is fine when you're running low boost, but you just don't want it to creep in high boost. Or you could get a really nice external gate and be done with all these problems

 

hold on so i get a question isnt the wastegate set so it olny opens after the turbo hits the deignated boost pressure set by the mbc or ebc?

 

Boost Creep
A turbocharged car is a positive-feedback system. The faster the turbo's compressor wheel spins, the more horsepower the engine makes. More horsepower means more exhaust gasses are being expelled. The more exhaust that is expelled the faster the turbine and thus the compressor wheel spins, and so-on until the engine explodes.

The ECU sometimes via a boost controller controls the boost level by opening the wastegate. Boost creep, in which the boost level of your engine continues to rise despite the best efforts of the wastegate, is caused when a fully-open wastegate can't divert enough gasses around the hot-side turbine wheel.

Boost creep can usually be eliminated by porting the wastegate opening and O2 sensor housing or by using an external wastegate. Both of these allow exhaust gasses to vent more efficiently.


found this defintion so it sould not matter if it is a biger flapper because the wastegate will not open until the required boost is met right?

 

thats all good in theory, but in all reality, a bigger wastegate flapper does wonders for boost creep without any drawbacks. why? it can be partially open. there is something called a boost controller that "controlls" how far open the flapper is, which controlls how much boost you are running. while it is true that the higher the boost you run, the less creep becomes an issue because more air is spooling the turbo, and less is going through the flapper, but having a bigger flapper will not in any way affect your ability to run high boost.

as for your question, the differences between the evoIII and the big16g are minimal, get either, just stay away from the china made fake evoIIIGT

 

so i know this is an old thread, but i am running a big 16g in my es turbo, it has no problems at all building or maintaining 25psi. may run higher but my motor is only built to see max 28psi so im not going to push my luck with the extra 3.