Wastegate Battle: 38mm vs 44mm vs 60mm

[ksboi]

I don't. Ive never heard of port differences until I joined thid site

From what I was told the boost solenoid has four ports, ie four port, two run to the gate which put increased pressure on the top of the gate which will allow no air to seap out which allows you to build boost faster and go way over the spring rate.

[aLmk]

trying to find it but on CRSX there was a manifold that was designed more for wastegate than turbo. Was a sick manifold.

I think it's the AFI manifold. The manifold Vit has on his black civic is also designed like that. Maybe he can post a picture here [MENTION=789]VitViper[/MENTION]

I agree with Almk, i am not certain where you read that you can reduce spring pressure but i also do not believe it is possible. Essentially you can't run a boost pressure lower than the spring pressure. A boost controller is only used to increase the total boost you want to run but adding pressure to the top of the WG. Would be beneficial if there was a way to reduce it but with the range a 4 port can operate in, just running a lower psi spring is also a reasonable option.

I think a 44mm wg is perfect for almost every application on this site. some people run twin scrolls and 2 44's might even be overkill but when it comes to preventing creep overkill is best lol. A 60mm wg unless your running some 800hp monster is unnecessary.

I like all of what you said, but in a way a high horsepower build can probably be just fine on a small gate, since it never really needs to run low boost anyways, who cares if most of the exhaust can't go out the gate when you need to make 30+ psi

I didn't read it anywhere apparently I was given the wrong info or misunderstood the guy that I was discussing it with last week at Cecil .As I said this is my first time exploring with 3 and 4 ports but you can bet when I'm done I'll know it well and have it perfected .I'll be making the change to reduce the amount of boost I can run if it means changing my wg springs then that's what I'm gonna do as I'd like to lower it to a few lbs in first and second on the street so I don't have to back pedal so much .I do indeed love the twin 44 mvrs they control boost so good up top it holds rock steady and you know I'm always one for overkill lol

Ya I would put the 3 psi spring in both your mvrs and use a single 4 port (unless using 2 3 ports is better, which I doubt it is, but I don't know for sure) as this will allow you to run as much boost as you'll ever want/need in the higher gears, but should make just about 3 psi on wastegate pressure.

If I change out my spring, I assume I'll need a new tune, correct? Due to the variation of boost pressures at different rpm

Who is your tuner? If the tune was done correctly, it really shouldn't need to be retuned. I mean turbos are not superchargers, they make boost at all different kinds of rpms since it is load based. So your tune should have the fuel compensation necessary for a lower boost level.

10 pound. I've only creeped a handful of times with it. My confliction is that I'm running a journal bearing turbo, so I need the wastegate to open as late as possible to allow for the quickest spool

What are you using for tuning? If you have k-pro or flashpro you can forget about this old school thought. With the quick spool feature hondata now has, a 4 port solenoid will hold your wastegate shut even more effectively than a larger spring would, ie it will keep a 3 psi spring gate shut till 3 psi comes and you will see much quicker spool because of it. Oddly enough just posted this in another thread, but Vit a while back showed a 1200 rpm improvement in spool time on a GTX3076 just by turning on quick spool.

[vdubkilla]

I never really thought about it til today and you guys are right it's not gonna happen 1/2 ing the spring pressure of 7 psi .He must have been talking about running (2) 3 port boost control solenoids and 1/2 the solenoid duty cycle on them .I am probably just gonna bite the bullet and buy a 4 port rather than fool with 2 solenoids .Snizz your gonna have to fill me in on it this weekend when I meet up with ya .

[aLmk]

I never really thought about it til today and you guys are right it's not gonna happen 1/2 ing the spring pressure of 7 psi .He must have been talking about running (2) 3 port boost control solenoids and 1/2 the solenoid duty cycle on them .I am probably just gonna bite the bullet and buy a 4 port rather than fool with 2 solenoids .Snizz your gonna have to fill me in on it this weekend when I meet up with ya .

You can get one from Vit for just $60, fairly cheap in the boost world. As for you using two wastegates, I think you can just put a T in both the lines coming out the side of the solenoid that go to the wastegate, and run a line to each gate.

[vdubkilla]

You can get one from Vit for just $60, fairly cheap in the boost world. As for you using two wastegates, I think you can just put a T in both the lines coming out the side of the solenoid that go to the wastegate, and run a line to each gate.

Just ordered a 4 port from him thanks fellas for clearing me up on that ish

[aLmk]

Just ordered a 4 port from him thanks fellas for clearing me up on that ish

Nice, what are you using now for boost control? I'd like to hear your impressions after you get it in and tuned.

[vdubkilla]

Nice, what are you using now for boost control? I'd like to hear your impressions after you get it in and tuned.

Currently running a 3 port mac valve .I now need to order springs for the waste gates and change them out the only thing is by the time I get them and get them in it's likely gonna be a little cool outside .I did a full pull this afternoon on 20 psi and man was that fun but traction is on the brink in 4 th gear up top I can feel it's about to cut loose but didn't yet haha