Hi-Boost, Low-Boost setup

Ero_sennin · Post by **Ero_sennin** » Mon Jan 07, 2008 4:32 pm

Phinx wrote:Just asking...

Did the management come with a Boost control Solenoid?
Becuase the S-13 has no unit as stock.

The stock one sort of came with one, it wasnt exactly designed to be used like that but it works, not to sure for how long it will last like that, hence why I want to replace it with one of the Audi ones

Phinx · Post by **Phinx** » Mon Jan 07, 2008 4:38 pm

Because the stock "CA18DET" had no way of measuring boost to my understanding and also had no control solenoid.
It had a direct feed pipe to the turbo actuator calibrated for Stock boost

But it did have a Fuel Pressure solenoid for cold starts

Ero_sennin · Post by **Ero_sennin** » Mon Jan 07, 2008 4:43 pm

Ill take a pic, and show you what it looks like

Phinx · Post by **Phinx** » Mon Jan 07, 2008 4:48 pm

Cool ....

No problem man

Sorry Hotstuff, Im going off topic...

Hotstuff · Post by **Hotstuff** » Mon Jan 07, 2008 5:02 pm

this is how my setup looks at the moment

the blue pipe at the rear of the enginebay goes to the wastegate
the middle black one goes to the turbo
the one in the front goes to the airfilter box

the last pic shows an unused vaccum opening????

the mind boggles....

Ero_sennin · Post by **Ero_sennin** » Mon Jan 07, 2008 7:07 pm

Ok acording to the FSM it is the Pressure Regulator Control Selenoid Valve.
(This is starting to seem dodgy and I am sure a few people will have something to say about this, hey Phinx?)
Ok on my car this is connected to the managment and controlls the boost. From Hi to Low, with the so mentioned switch, any way mine is connected up as follows.

Top connector goes to just after turbo on hot boost pipe.
Middel conector goes to the wastegate canister.
Bottom Connector on mine is off. (assuming this goes the the airbox) as this will just bleed off excess air.

Hope this helps. I would actually like to go poking around on someones s14 engine bay to check a few things and compare it to my SR20DET

veecee · Post by **veecee** » Mon Jan 07, 2008 7:08 pm

hey HS,

phinx is incorrect. the s13 ca18det, did have a solenoid to control vacuum. it normally bleeds off into the intake pipe between the AFM and the turbo intake.
the other end of it is usually connected to the FPR via a series of hard pipes and hose connectors that run between the cylinder head and the firewall.

because of the location chosen to source vacuum for the BOV, the original vacuum source for the FPR is no longer being used, and that is why the little pipe between the cylinder head and the firewall is no longer being used.

so your original solenoid is now controlling boost because IT is being controlled by the perfect power unit. the same original solenoid also still has a hose connected with the little connector that is supposed to go into the intake between the AFM and the turbo. so i assume that this must stay there.

as for the way that it is properly setup, it was quite stupid of us not to take note of it, but i forgot about the hi/low setting!!! sorry mate. but i would take note of the way that ero's is setup because his was also done at calibrator. basically it means swopping the middle and rear facing connectors and trying that out.

Ero_sennin · Post by **Ero_sennin** » Mon Jan 07, 2008 7:17 pm

Exactly!

veecee · Post by **veecee** » Mon Jan 07, 2008 7:21 pm

Phinx · Post by **Phinx** » Mon Jan 07, 2008 9:00 pm

My Bad

the stock "CA18DET" had no way of measuring Boost to my understanding and also had no control solenoid.

It had a direct feed pipe to the turbo actuator calibrated for Stock boost

Did the management come with a Boost control Solenoid?
Because the S-13 has no unit as stock.

I'm sorry If I am sounding Rude, I mean this with "max" respect but I was not arguing that the "Ca18Det" didn't have a pressure control solenoid. I was Arguing that It didn't have a BOOST control solenoid like the S-14 in Stock Form.

I'm sorry but I never though of the solenoid being used in that way.
As to me it seems hillbilly but who am I to talk

So my bad , I cant really Assist ..

Thanks

Sokar · Post by **Sokar** » Mon Jan 07, 2008 9:45 pm

VC and I had this conversation last night, the CA does have a control solenoid, but no way to measure boost, so you cant ACCURATELY measure boost and bleed off air to the actuator..

The only way I think the good ol' 'bater would have done is bled off air according to RPM (i.e from spool to boost to dropoff) and just bled less for high boost... Not a good way to do it as boost can be effected and not happen when you expect, anyone else got any ideas?

Ero_sennin · Post by **Ero_sennin** » Mon Jan 07, 2008 9:51 pm

lol, this is why I said above that this seems dodgy and people are going to respond, I tend to agree tho, somehow it does work, dont ask me how I didnt set it up, but I want to change it for a boost control valve in the near future.

Sokar you are correct with the rpm theory, looking at the maps I noticed that altho I think for the boost control selenoid it would work the same.

Toby · Post by **Toby** » Tue Jan 08, 2008 7:21 am

ChemCool, are you reading this? This might explain your starting issues, maybe? When the ECU thinks the engine is cold vs hot?

Vlade · Post by **Vlade** » Tue Jan 08, 2008 7:56 am

I've been pondering of hooking this up to my Wolf for some time now... maybe this is what I'll do for the weekend... Will need to get hi/low boost setup ready for the Dyno.

Hotstuff · Post by **Hotstuff** » Tue Jan 08, 2008 9:59 am

Thanks everyone for all the comments and input... Will have a look at it over the weekend and will keep everyone posted on my findings and solutions... or lack thereof...