I was just curious, with an EBC what are the possibilies concerning max controlable boost vs spring pressure? I know with a MBC its not wise to go more than 2x spring pressure. With an EBC, I think I recall someone saying you can go over 5-10x, albeit the 10x needing CO2.

The reason I ask is because my car is 100% a street car, I get abysmal traction in the rain & snow, and I just happened to get a spring that gives me 4psi (I guess they make them that low!). I almost like it at 4psi though, it makes my D16 feel like my NA B18B did long ago...

 

It's about the same, about 2.5 Times the spring.

 

Well at least my WG isn't that hard to get to. I'll probably end up putting a heavier spring in, since 2.5x/10psi won't be enough to satisfy me...I'm looking for at least 18psi

 

that's over 25psi. Not enough for ya?

 

I meant 2.5=10psi n00b I'll try pushing this dinky spring, and if it doesn't work well with eCtune's "closed loop" target feature above 10psi, I'll definately be upgrading.

I don't think my tranny would much like 25psi...

 

The 2.5x rule, that has to depend on how the EBC is plumbed.
Are we talking with the EBC controlling the bottom port reference line ONLY?
Or is that with the EBC controlling the top port?

 

Its a 5 yr old thread...

 

Relax. This is exactly the topic I am researching.

 

my 3.5psi tial spring holds 17-18psi pretty steady in my 38mm gate running a AVCR.

 

What's the duty cycle percentage of the solenoid at that boost pressure? Considering it uses a stepper motor, it can do a little more than the average MAC boost solenoid, but I betcha its high as hell.

 

mac solenoid....running about 65%DC

 

The plumbing method definately makes a difference then. Non-VTEC is using the two port method-1.


This is the standard method that most people use. Im confused why so many say the 2.5x rule applies to this method.

 

Edit..

Wrong pic

 

my ebc has port 3 to atmosphere and the bottom of the wastegate with a boost refrence. Holds boost good for me from 4psi to 15psi.

 

What duty are you at 15psi? If your solenoid is connected only to the bottom wg port then that is called the "single port method".

Dc4LsTeG - The two port method 2 simply switches the boost reference from the bottom to the top port.

 

muckman: sorry i didn't look at the diagram closely when i first saw it....i have method 1 hooked up with the vacuum t between the bottom port of the gate and boost pressure source...

 

I copied the instructions from hondata and my 7psi spring holds 28psi at 100%. With boost leaks nasty boost leaks

 

Why dont yall just run 2 solenoids? Im running a 5 psi spring and at 22 psi my duty cycle is only 55%

 

2 solenoids are no better than a 4 port. The best any solenoid can do is apply all pressure to the top port and stop all pressure to the bottom port.

*Edit: 2 solenoids with 2 drivers give you finer control and more resolution.

 

im running into a situation with my lack of understanding how to utilize this mac solenoid i have fully. im running the s300 and just changed the hertz from 32 to 25 hertz (this is based off a friend of mine that has the same exact solenoid). for some reason my solenoid wont hold at 10psi (low boost) ill just go all the way to about 13lbs. hopefully since i changed my hertz frequency this issue will some how get resolved.

as for plumbing, i have a vacuum block and my garrett turbo doesnt have the nipple on the turbo nor do i have a fitting on cold side of the intercooler pipe. instead everything goes to my vacuum block: bottom wastegate port, port 1 of mac boost solenoid.

 

So you swapped out the original stepper solenoid for a MAC, solenoid.. interesting. 65% duty? hmmm. I'm not completely convinced. but the only thing that would , would be to actually be at the car, so. I guess there's no real comment to that.. hmm.

 

justYncredible - the boost source doesnt matter just put your vac block where the compressor is in this picture. But first make sure your wastegate will not creep with no ebc connected - just a vac hose to the bottom wg port.

 

got everything working with my boost control feature. instead of using boost by gear, im using boost by duty cycle. after setting my boost solenoid back to variable frequency i was able to hit 10lbs of boost like i was after my tune. i used the PWM duty cycle percentage to fill in the parameters for my 1st-5th gear boost levels. so far its working fine, it just crazy seeing it in action lol. i called hondata and they told me i had to disconnect the B5 connection going back into the car...rookie mistake on my part. tomorrow i will trial the low/high boost switch.

also, my boost cut is set for 18psi, but after viewing my datalog my map sensor (omni 3 bar) reads kPa, should i change my boost cut accordingly?

 

Does anybody run EBC plumbed like this method - Two Port Method 2?


If so what is your min/max psi at what duty cycle? I would expect this to behave similar to the 4 port but Im not sure how it would react without a vent in the system.

 

I connected my Eboost a few years back like in that diagram and no matter what duty cycle i set it to it would just hit boost cut at 22 psi. Went back to a boost course to the bottom of WG and the EBC to the top port and worked fine