What all is everyone using for WG spring sizing on their 4port boost solenoid setups?

Originally on a 72mm turbo setup with twin 38mm wastegates, 7lb spring. it would boost creep like crazy, but even in the higher gears, boost resolution was crap.

Ended up swapping to dual 46mm wastegates thinking it would help with my creep. 6lb spring. Fixed my creep but the resolution is absolute crap. 15-30% duty cycle range for spring pressure through 35lb.

I can either stack a 3lb and 1.5lb spring in each gate, or can do 3lb by itself.

End goal is 38-43psi. Can a 3lb spring get me that far? I'm really looking for better duty cycle resolution, but afraid a 3lb spring may not net me my boost goals. anyone run a super light WG spring and still get into the 40psi range?

Doesn't seem like a big deal, but accessing my wastegates is a total PITA, so I only want to have to change springs once, lol.

 

I was able to achieve 38 psi with a 3# spring on a 4 port mac solenoid and a PWM booster from Vit Viper with 44% duty cycle

 

I used the 4 port boost solenoid before and it was awful. Using numbers for an example here.. Say at 20psi the PWM would be at 50% and then 22psi the PWM would jump as high as 75%. It was a headache to try and dial in. I hear everyone has great results with the dual 3 port solenoid route. Keep us updated!

 

Good to know. Just looked up the PWM Booster...looks like it helps stabilize the psi jumps when increasing DC%. Interesting.

Did you try going higher than 38lb or is that where you wanted to stop? Just curious if boost went erratic after 44% DC or anything.

Thanks for the input, looks like I'll toss the 3lb'ers in and give it a whirl..

 

Yea for me, really the 4port gives me a realistic, 10-15% DC window, where itll range from mid-teens boost, to over 30-35. Pretty hard to control, and each DC% adds like 3-5psi, that's why I'm interested in dropping my WG spring rate even lower, just wasn't sure if too light of a spring would affect my max boost. My tuner said I should just leave it, but he's a rwd guy and isn't as concerned for power management in the 330' like a 900+ fwd car would. And our local track is horrible with track prep, so power management is definitely key for me.

I have 2 3-port solenoids on stand-by, but I would need to run 2 separate duty cycle tables to control the top and bottom ports. I'm pretty certain I can do that in AEM Infinity, I just haven't looked further into it since I'd like to try and keep it simple w/ the 1 4port.

 

Cracked a sleeve at 38 so that was as high as I was able to push it

 

we run a 4 port, single turbosmart 60mm gate, 6lb spring makes
10 to 45+ so far

 

read into doing dual 3 ports. I hear it's easier to control boost and you can multiply your spring(s) even more

 

on what turbo? I have a 4 port and recently discovered it wouldn't go higher than 36psi in the current weather with my 15psi Spring. I then discovered that the default hondata frequency 78hz is way off for the 4 port. I'm going to try it at 20hz this Tuesday night but I'm debating on lowering the gate springs a little as well. This is my last chance to test before wcf and wcf is backwards from every other track. You just have to give it the kitchen sink there lol.

 

I was just about to comment on the frequency, the 4-port solenoids are much more sensitive to Hz than the typical MAC 3-port. If I remember correctly I have mine set to ~20 Hz vs the 31 Hz I ran on the 3-port. On a 9 psi spring, I have pretty decent resolution where 58% DC = 25 psi, 68% = 29 psi running via eCtune on a Holset HX40 with 50mm single gate.

On our drag car which runs a 72mm turbo, 60mm Pro Gate and Haltech Elite, it is much much more sensitive where ~25% DC = ~32 psi

Play with the solenoid frequency to try get the widest possible range and reduce sensitivity.

 

Matt and extreme, have either of you tried the PWM booster?

 

IDK how much of an effect the frequency has on DC, but if going to the correct hz range is suppose to make it operate normal, then that 15lb spring is going to be way too high of a spring.

Report back if on your experience if you can. I swapped the 3lb springs into my gates last night.

 

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Ya I'm debating on pulling one of the springs tonight, going testing tomorrow. I have a 5, 10, and 15 option. If it works I can get a lot of boost. I need upwards of 50. If it doesn't work in gonna have to find a fat guy to put the big combo back in at the track lol.

 

No first I've heard of it to be honest

 

What ECU do you have?

My 4 port was touchy as **** on the Hondata.

When i put my Motec M1 in the car with the 4 port it was a hell of a lot better, still a littl touchy tho.

I run Dual 3 ports now, and its ******* on the money.

 

Originally, I was running the 4-port on AEM V1...I am now on AEM Infinity, just haven't hit the rollers yet. So I know theres likely a big jump in having better modulation in the EMS swap alone. Too afraid to waste dyno time to find out. The 3-4psi jumps per 1% DC increments were too much for me to risk again, as I'd like to finally just get this car wrapped up w/ the kinks sorted out.

What size spring(s) do you run, what rough DC%, and max boost?

 

Yeah that is exactly what my car would do on the S300. 2-4 psi per 1-2% DC increase, i hated it. lol

I have 6psi springs in both my gates. I am actually able to get 33psi out of a SINGLE 3 port.

Basically i get to 33psi at say high Duty on the 1st solenoid and then 45% or so on the 2nd to get 53-54psi.

I will say if you have the ability to use 2 3-ports, you might make your life easier haha.

 

well i went to the track last night, rewind to last weekend after my last session, i tested my solenoid at different frequencies the next day just to see and it would make a clean buzz after i couldn't make over 36. I chose a frequency of 20hz for last night. I put a 10psi spring in and by 40% i was maxed out at 31 psi. I put it at 66% and it didn't budge. Turbo has zero wear on it.

I then retested the solenoid at the track right after a run and put it to 31hz. It sounded like a 5 year old typing on a type writer. Random clacky clicks. So it seems as though she has died either by vibration, running it at too high of a hz, or just a bad coil. New one ordered. What a waste of resources lately figuring out b00st. 40 psi minimum or im sitting on the couch lol.

 

My experience is limited but I had nearly a 1:1 ratio when we were adding boost in 4th for BBG in S300 with that PWM booster and mac solenoid. Appears he doesn't sell them anymore but I'd be happy to send mine to you Matt to test out

 

ive been using the 4 valve for 2 years. Just never needed or wanted to run 40+ on the norm until now and i am just used to what it was doing duty wise to make what i was making. Now its trials and tribulations.

 

New solenoid is installed, Testing tomorrow, hopefully this one shines and makes the big b00st.

 

Were you able to test it out?

 

Yeah it didn't work. It just flat lines everytime at exactly 31.6psi no matter what settings i use with a 10 psi spring. On top of that, totaled my liberty trans so this issue just got pushed down the list.

 

Sorry to hear Matt. We have been messing with a 4 port but on a different EMS (Vipec) over the last couple of days. I'll let you know what we figure out. May or may not help