Except I am sure there will be other turbos which will spool and flow as well as a GTX3576R but won't surge?

 

Audible surge is likely not remedied with a better "anti-surge" compressor housing. I would agree that one surge housing could be better than another, but I don't suspect the differences to be enough. I am not saying you are wrong, but i am trying to conceptualize how a similar turbo would not have surge vs. the GTX3576r.

The downside of spooling a larger turbo quickly is the issue of surge. My posts are meant to show how surge can be managed using a dual port BOV and boost referenced solenoid. The concept is clearly not mine, but it is good for others to see independent verification.

 

is there another ar turbine option that you can try to see if that helps?

 

The anti-surge housing is just there to effectively make up for the ability of the combination of wheel design, diffuser and scroll to keep pumping at airflow levels below their ideal for a given pressure ratio. Its not THE thing that defines when surge is going to happen, or not - more of a bandaid.

So, what comparable turbo might not have that issue? I used Excel to compare the surge lines of an EFR7670 and GTX3576R (you can easily pull one or both of the maps up yourself to confirm if you are dubious). The EFR makes the GTX look like a surge monster on paper, and I know through RSMike that the EFR7670 imperssively good at keeping its calm in high boost/lowish flow conditions.

See pic:

 

I am intrigued by the EFR turbochargers, but I think of them like the colossal squid.

 

as in?

 

Rare. Is the reference

 

I did infanct just realize that you had the qr with the wg functioning simultaneously . Shouldnt have a problem with shaft speed now! Maybe I'll use the bottom port on my greddy type s.

 

The Greddy Type S looks like a good unit and I only used the Tial 44mm wastegate because I had it laying around. You can see below how I have it configured now and it eliminated the part throttle surge. The MAC 1111A-111 solenoid should arrive on Monday so I will post pics and review when the mod is complete. If you do the mod with the Greddy let me know how it works.

 

The single spring mod seems to be working for me just fine, but I've wondered how I would test to see if it needs more spring pressure .. If I did need both springs the bottom port would definitely be used. The bottom port does t seem to be leak free though. Maybe it's designed that way.

I always figured teeing in a hallman would allow you to bleed pressure from the reference line where the mbc is adjusted to therefore mechanically limiting bottom port pressure.

20-150 are you sure that pressure range functions low enough to be useful for your set up?

 

As long as the valve will stay mostly shut below 20psi I should be ok. It is the same valve that was offered in the original kit so we shall see.

 

UPDATE:
I got the MAC valve installed with no issues. This is a great little valve as it is all mechanical so no need for a hobbs switch, wires, power, etc. I have yet to test it, but I have no doubt it will work. Should have an update after lunch.



I started this weekend tuning on the Haltech Platinum PnP. It is nice to finally convert to speed density and the car is completely drivable although I still have a lot of tuning to go.

 

I'm very interested in hearing if you give the rally anti lag a toy with in the haltech. Also how does that valve actuate from the cabin?

Looks sophisticated the way you looped that normally close/open port lol

I want to accomplish an air injection anti lag set up because I believe it can be road car safe ie: p1 and add quadruple the fun in rallycross, auto cross etc.. So hearing the haltech and it's ability would be plus.

I think using a tial that is lightly sprung allowing vac to open it + ref line on a blocker to prevent premature leak is something to consider .

Enough of my pipe dream though!

 

That is the beauty of this solenoid, it is all self contained and requires no power.

0 - Boost reference for switching 3 way solenoid (20psi switch point)
<20psi - Open connection between "3" and "1", "2" closed
>20psi - Open connection between "2" and "1", "3" closed

Essentially, below 20psi I have pressure to the bottom port and above 20psi I don't.

 

Just clicked how that all worked. Nifty. Was it 12$? That's what google showed ?