help fitting HKS EVC

johnnycoo1 · 01-10-2011, 01:03 PM

hi , wonder if some of you guys can help or have one of these installed , the bit im not 100% sure on is where or how to connect the intake manifold pressure source which goes to the controller port 3

ports 1 and 2 go to the wastegate and intake side of intercooler so that is fsirly srtaightforward i just wondered if there was a good place to connect this port 3 too ??

any help or installation guides available on this ? i have the HKS documents but of course they don't help with the 964T specifically

cheers
johnny

WinRice · 01-13-2011, 05:48 PM

Which EVC do you have?

I'm looking at my EVC5 and here's what I get

Port #1 (B) - Goes to intake manifold, base of throttle body that is not blocked by the throttle plate
Port #2 (I) - Goes between the intercooler and compressor outlet, and tees into the base fitting of the wastegate.
Port #3 (O) - Goes to the top of the wastegate

johnnycoo1 · 03-15-2011, 02:18 PM

hi thanks for the reply - im using the EVC IV i think the ports are numbered differently but go to the same places .... i have everything in now with my port 3 connected after the throttle body the other two control the wastegate , however the monitored real time boost level seems to be a good bit lower than the stock boost gauge is reading ??? - 964 T rev counter digital one ...... scared to try it more as first time i hit boost cut when it was only set at 0.7bar ! any ideas ? does learngin mode or offset adjust the monitored boost level ?
thanks
Johnny

johnnycoo1 · 03-15-2011, 02:53 PM

oops correction mine are

port 1 after throttle body- 4mm hose
port 2 T to 8mm pipe running into intercooler from wastegate -6mm hose
port 3 wastegate acutator -6mm hose previously went to atmosphere

does this make sense ?

cheers
johnny

Thierry25 · 03-15-2011, 02:55 PM

Quote:

Originally Posted by johnnycoo1

hi thanks for the reply - im using the EVC IV i think the ports are numbered differently but go to the same places .... i have everything in now with my port 3 connected after the throttle body the other two control the wastegate , however the monitored real time boost level seems to be a good bit lower than the stock boost gauge is reading ??? - 964 T rev counter digital one ...... scared to try it more as first time i hit boost cut when it was only set at 0.7bar ! any ideas ? does learngin mode or offset adjust the monitored boost level ?
thanks
Johnny

So far, the stockdigital boost gauge of 964 T is not accurate ...

WinRice · 03-15-2011, 05:49 PM

I've found the EVC boost gauge is pretty accurate.

What spring do you have in your wastegate? It needs to be lower than your expected range of adjustment. I.E. you need a 0.6 bar spring if you want to adjust between 0.7 - 1.0 bar.

Does it boost like normal with the EVC off?

I don't documentation on the EVC IV, do you have sketch? Pics?

johnnycoo1 · 03-16-2011, 03:23 AM

hi , i still have the standard spring - 0.7ish i guess

I think i am just being a bit carefull and the difference between the HKS indicated pressure and the 964 guage scared me a bit - i was gently boosting - 0.3 bar on the digital guage but HKS barely showed 0 , its had to watch both at the sme time , guess I'll try it with it switched off make sure everything is normal - then maybe run that test mode that captures the factory boost on the HKS and see what it *thinks* it is ?

does the hks system display the pressure after throttle body ie manifold or the intake pressure as per the factory unit ? maybe this would explain the difference ?

thanks
johnny

Thierry25 · 03-16-2011, 05:16 AM

Quote:

Originally Posted by johnnycoo1

hi , i still have the standard spring - 0.7ish i guess

I think i am just being a bit carefull and the difference between the HKS indicated pressure and the 964 guage scared me a bit - i was gently boosting - 0.3 bar on the digital guage but HKS barely showed 0 , its had to watch both at the sme time , guess I'll try it with it switched off make sure everything is normal - then maybe run that test mode that captures the factory boost on the HKS and see what it *thinks* it is ?

does the hks system display the pressure after throttle body ie manifold or the intake pressure as per the factory unit ? maybe this would explain the difference ?

thanks
johnny

I tell you again .......... the stock digital gauge is not accurate at all !!!!

Can your HKS display absolute pressure instead of boost pressure ?

johnnycoo1 · 03-16-2011, 07:50 AM

if you mean can it display -ve pressure then yep it can .......

WinRice · 03-16-2011, 08:16 AM

Quote:

Originally Posted by johnnycoo1

does the hks system display the pressure after throttle body ie manifold or the intake pressure as per the factory unit ? maybe this would explain the difference ?

Most of the factory gauges are not that accurate, as Thierry said. The large boost gauge that replaces the clock isn't bad, but boost moves so fast it's hard to get an accurate peak. The sensor is in the manifold for true manifold pressure.

If the EVC is plumbed correctly, it reads below the throttle plate for true manifold pressure. And it records peaks that you can reference after the run for tuning.

WinRice · 03-16-2011, 08:21 AM

Quote:

Originally Posted by Thierry25

Can your HKS display absolute pressure instead of boost pressure ?

My EVC V calibrates to atmospheric pressure on startup, then displays boost pressure, or manifold vacumn whatever the case may be. It probably has a setting to go absolute, but I need to check the manual.

Thierry25 · 03-16-2011, 08:30 AM

Quote:

Originally Posted by WinRice

Most of the factory gauges are not that accurate, as Thierry said. The large boost gauge that replaces the clock isn't bad, but boost moves so fast it's hard to get an accurate peak. The sensor is in the manifold for true manifold pressure.

If the EVC is plumbed correctly, it reads below the throttle plate for true manifold pressure. And it records peaks that you can reference after the run for tuning.

So if the HKS can display the absolute pressure , you can see near 1 bar at rest. ( atmos pressure ). Thus if you read 1 bar at rest ( depending the forecast :-) ) it means your sensor is correctly calibrated. Thus on, boost , if you see 1.7 bar , it means that you have 0.7 bar (average) of boost presssure ...

As Win said, the large clock boost gauge isn't too bad. There is also many affordable gauge on the market which can be used for your test.

johnnycoo1 · 03-16-2011, 02:26 PM

hi guys , cheers for the input ,

the port 1 (4mm hose) is the one i stuggled with on instalation , I have used a T piece and connected it into the pressure sensor input line on the ignition control unit as this seems to take manifold pressure in - is this ok just wanted to confirm .

from what you have said is the displayed pressure on the EVC the reading taken from this line ?

cheers

J

WinRice · 03-16-2011, 03:17 PM

Without pics and the EVC IV manual we're kind of shooting in the dark here. We need more info. I would like to believe the IV and V are plumbed the same, but might not be the case.

johnnycoo1 · 03-16-2011, 03:28 PM

manuals are here
HKS USA EVC IV Instructions - Install
think its plumbed the same as the V

cheers
johnny

johnnycoo1 · 03-18-2011, 10:18 AM

ok tried to put the HKS in learning mode - very odd - wouldn't work ! just stills in low or high boost adjust mode but the volume knob wont do anything ! then reverts back to monitor mode - mod button won't do anything either ! doesn't sound good -
I turned off the unit but the car still overboosted and hit boost cut ! is this normal even if my EVC is off ?
looks like my unit may be broken ?

thanks

johnny

WinRice · 02:54 PM

Should be pretty simple, but re-check your hoses. The ports are labeled a little weird, right to left they go 1,3,2. Going off the diagram 'External Wastegate'.

It's a little different than the V model, but the plumbing is close.

Port 1 (4mm end nipple) - manifold pressure, any place below the throttle body, direct to the manifold, even 'T'd off the brake booster line. Needs a good clean connection to the manifold.

Port 2 (6mm end nipple) - bottom of wastegate, below diaphragm. Also, 'T'd into pipe between turbo and IC. Basically 'T'd into the stock wastegate control hose.

Port 3 (6mm center nipple) - top of waste gate, above diaphragm, normally open to atmosphere on stock 930.

Make sure the switch on the back is on 'PO', and you set that with the power off.

With the power turned on, it should give you a manifold pressure reading.

johnnycoo1 · 03-19-2011, 03:24 AM

yep thats pretty much what i have - checked and rechecked can't see anything wrong -
should i not get stock boost with this thing tunred off - seems to hit boost cut with it off which can't be right !

only thing i was wary of was were i'd connected the 4mm hose - ie into the ignition control modules vaccuum line which appears to be diretly off the manifold ..... should be ok ?

other problem is still with the unit itself - something not right here as i can't get it to do anything and mod button doesn't seem to work !

dammm

I would be happier if i was getting stock boost at least with the current plumbing and the power off ! thats th ebit that is most annoying !

cheers

J

cole930 · 03-19-2011, 04:06 AM

Going to play the Devil's Advocate here, can't resist just part of my nature, take a look at where the factory tied in the boost line.

Cole

WinRice · 03-19-2011, 05:55 AM

Everything off gives you stock boost level.

For fun, disconnect both of the the 6mm lines and hook up the boost line like stock, leave the Port 1 (4mm) connected and see what happens. Your boost should be stock, because we're not controlling it, but the EVC should be reading manifold pressure on port 1.

These stepper motors can go bad, especially if they have been exposed to moisture, or had moisture in any of the ports.