nope

 

no pills required for 3port

 

I was thinking today... I wonder if you could set up a 3 port and wire (aka hose) in parallel a MBC and set it to a max boost level, to prevent boost spikes. Kind of like a back up plan / insurance.

An example would be if you tuned your car to 25 lbs and set the MBC to say 26.5.

I thought of this because the factory bleed system is designed to be fail proof. Factory 2 ports quit working and the boost system still works fine. 3 port gets stuck in boost off position, and engine sees huge boost spikes and dies.

 

Maybe a bit late, but I use the GrimmSpeed 3-port on my STi -- works like a charm. Make sure you or your tuner knows how to tune for it, though. Here is my car in action, after I had my EWG installed with 3-port.

http://www.youtube.com/watch?v=_RHC1Izl3vg

 

Question for the grimmspeed users..
Who here runs the grimmspeed with the wastegate dumped? My tial 38mm is dumped and with the grimmspeed it flutters like crazy during WOT. At first it didn't bother me much but now it's getting annoying. Any suggestions?

 

3ports work by opening/closing rapidly, so this sounds normal if there are no other symptoms.

The solution (and I say this a bit tongue-in-cheek since I find open dumps annoying) is to, of course, plumb the WG dump back into the exhaust, or otherwise exit it out the back of the car...

 

I know its not cool, trendy, or the current hot street setup, but MBC is the route I chose. Simple + cheap + effective. I've tried all the forms of boost control and I always end up back to and happier with a MBC.

 

- it has nothing to do with cool/trendy/hot... some of us like to drive at partial throttle without building a ton of boost (or any at all), have different boost profiles in each gear, keep failsafes in place, or simply don't like the uncertainty of a MBC due to changes in weather.
- simple? if you can post here, you can tune your boost curve. effective? clearly. cheap? sure, why not: http://www.diyautotune.com/catalog/e...kit-p-285.html

don't get me wrong, I have nothing against using a MBC, but your post implies that MBCs are equal (if not superior to) a 3port when this simply is not the case, and actually the contrary is true.

 

Thanks for the reply,
I will talk to my tuner and see if he has any ideas but if I have to I'll just route it back into the exhaust.

 

If the Waste Gate is really opening and closing as fast as the 3 port operates, then that is one wicked fast waste gate. Maybe you simply need to use shorter hoses or wire (hose) the waste gate up differently.

 

You can tune out the flutter a little bit, but it's normal ... here is the latest video of me on E85 ... GrimmSpeed uppipe, EWG 38mm tial, GrimmSpeed 3-port.

http://www.youtube.com/watch?v=7X-5dcf5_6w

You can hear it a bit better here:

http://www.youtube.com/watch?v=EwUNt1jgn-g

I used to hate the flutter, but now I don't give a crap so long as my car goes like a bat ouf of hell. If I put the factory bleed type BCS back on, it just screams (sounds better), but car doesn't boost as fast and I over-boost because it can't control boost very well with my aggressive tune. You have to have a very smooth boost curve with the factory controler (guessing your Evos have a similar stock setup). But with a 3-port, you can get aggressive with it ... just get a 3-port ... stop being a cheap. Evos and STis deserve to be spoiled.

 

While I kinda like scaring the hell out of people sometimes, it does get annoying sometimes (but my Subi is not my daily driver, so it's not such a big deal for me). However, another point against straight-to-atmosphere dumps is that you put very hot gas under your hood and/or right next to your tranny. I have no proof, but I think it affects the tranny a bit. My new, big turbo setup will have EWG, but I am plumbing it back into the DP. You will still get some rumble from it,but it won't be as loud, and it won't dump hot gas right onto your tranny (at least on STis). I think it's even worse for EVOs (hot gas under the hood).

 

Sounds similar to yours praha-sti..but louder. I love when it screams so don't really wanna recirculate it back..just tired of the flutter. I'll make a vid and post it up. Talked to my tuner and he has a few ideas so I'll get it taken care of when I get a new tune for cams and springs..does anyone know if the perin 3 port flutters with dumped wastegate?

 

To each their own. I've found a MBC to be much steadier and more reliable on my cars. As for not wanting to build boost during part-throttle...ease up off the accelerator, I see no reason to basically program lag into my car. I love the instant response associated with a MBC's characteristics. Yes, ECU-controlled does has it's advantages in certain situations, but none of those situations apply to me or my car.

 

I do, ETS o2 elim downpipe with wastegate dump.

Another funny note is the flutter got better with setting the BTEL a bit lower then my load.
Once I switched to PSI boost control and not load, the flutter is almost gone and my boost curve got even better 25.6 PSI @ 3400 holds tell 5700 then only tappers to 23.1 at 7000

So I am all about the Grimmspeed 3port + PSI boost control at this point.