HKS EVC 6 question..

[acyv]

Dear Friends,

I am planning to use HKS EVC 6 ( Electronic Valve COntrol, Boost control) to my 2008 Cupra. But I have doubt if this boost control is compitable with my car or not. At EVO9,10 and IMPREZA(S) we use it without problem. I want to ensure myself if you have already tried and got good results.

Regards,
Cem

 

[Yosh]

Can work if correctly spidered into ur ECU harness...Do you have aftermarket software on the car?

 

[tainlunar]

dont be such idiot please! its not JAPANESE CAR! go buy a impreza if you need it

 

[robdf2]

dont be such idiot

good way to make friends on your first post

 

[Mark300zx]

HKS EVC 6 fantastic piece of kit, but alas I don't know what it is like on a Seat

 

[Yosh]

good way to make friends on your first post

+1

 

[acyv]

dont be such idiot please! its not JAPANESE CAR! go buy a impreza if you need it

Idiot? Are you allright? Understood that you have no idea about tuning etc...

God bless you

 

[jonathanp]

I have a HKS EVC 6 on my car (LCR)

works fine and seems to do a better job than the N75 of controlling boost.

If you get one installed you'll have to wire it in to your throttle pedal at least preferably rpm as well. With the throttle wired in you can set how much boost you need depending on thottle position and also what duty cycle depending on the throttle position. If you wire it for RPM as well you can adjust the duty cycle so at full throttle at low RPM it'll pretty much keep the wastegate closed to spool up as quickly as possible and then run a more sensible duty cycle to eliminate mid range spike.

On the LCR I bypassed the N249 as this could interfere with boost sometimes by opening the DV. Also you shouldn't really set the HKS to run more boost than what your car is mapped for as fuelling probably wont be at its optimum. I mainly bought the HKS because I wanted better control of how the boost is delivered in certain conditions also allows me to run a second program with less boost for snow/rain etc.

 

[acyv]

I have a HKS EVC 6 on my car (LCR)

works fine and seems to do a better job than the N75 of controlling boost.

If you get one installed you'll have to wire it in to your throttle pedal at least preferably rpm as well. With the throttle wired in you can set how much boost you need depending on thottle position and also what duty cycle depending on the throttle position. If you wire it for RPM as well you can adjust the duty cycle so at full throttle at low RPM it'll pretty much keep the wastegate closed to spool up as quickly as possible and then run a more sensible duty cycle to eliminate mid range spike.

On the LCR I bypassed the N249 as this could interfere with boost sometimes by opening the DV. Also you shouldn't really set the HKS to run more boost than what your car is mapped for as fuelling probably wont be at its optimum. I mainly bought the HKS because I wanted better control of how the boost is delivered in certain conditions also allows me to run a second program with less boost for snow/rain etc.

Thank very much for your usefull information. I'm also planning to arrange only boost pressure widely. But i have a doubt, as the original spring of stock wategate is not allwoing to work fine basis 1.5 bar cont and 2.0 bar peak pressure. Shall i use external wastegate or stock one with changing spring tension?

 

[jonathanp]

I'm not sure what you mean. Are you saying you want to run a 2 bar spike and hold 1.5 bar to the redline but it not allowing you to hold 1.5 bar all the way to the redline?

I have a problem on my turbo (hybrid k04) where there is too much back pressure at high rpms which stops me from holding boost. I'm hoping to adjust the duty cycle at high rpm to compensate for this.

 

[acyv]

The matter is as follow :

I have mapped the car and turbo is supplying 1.5 bar continuous and 2.0 bar peak but this is done by modifing the wastegate spring's tension. Because original(stock) wastegate's spring is releasing the pressure at high rpm's that's why car is losing power and not boosting. We changed the spring and we have seen 2.4 bar peak and 1.6 bar continuous but this time fuel pump remained weak. Therefore i ordered HPFP from APR USA. After arrival of this unit, we will see the result. But car's stock boost control is not so effective to see 400/450 hp power.

Back pressure problem is normal as the manifold radius is small that's why it's occuring.

 

[Mark300zx]

I have very limited experience on Leons, sometimes with aftermarket boost controllers and uprated actuators springs, they fight against each other, as I believe a lot of EBCs are designed to work with stock wastegate springs.

 

[acyv]

I have very limited experience on Leons, sometimes with aftermarket boost controllers and uprated actuators springs, they fight against each other, as I believe a lot of EBCs are designed to work with stock wastegate springs.

Yes could be but not with MK2 Cupra. Stock spring very very soft tensioned and it doesn't support 2.0 bar peak and 1.5 bar continuous. It supports 1.2 bar cont and 1.7 bar peak.
In order to achive 1.5/1.6 cont and 2.0 bar peak, surely need to change stock spring of wastegate or to use external wastegate system with external boost controller.

 

[jonathanp]

Do you know what your acutuator pressure is set to?

When you install the HKS you run the car at full throttle up to high revs and this will record your baseline boost. The HKS will then use this figure to control how much boost the steeper motor feeds to the wastegate allowing you to up the boost.

On my my turbo the wastegate opens at 12.2 PSI standard K04's normally open at around 5PSI. This means that the lowest boost I can use is 12.2PSI.

If you had HKS a installed on your cupra it should allow you to use a continuous 1.5bar to the redline. If you want to have a spike you can set this to happen at certain RPM's or you can use the scramble button to give you an extra 0.5bar for up to a 60 seconds.

 

[Mark300zx]

Again forgive me if your leon has a different setup!

Usually when you have an aftermarket boost controller, having a weak spring is not an issue as the solenoid stops the wastegate from opening until the desired pressure is reached.

 

[acyv]

Again forgive me if your leon has a different setup!

Usually when you have an aftermarket boost controller, having a weak spring is not an issue as the solenoid stops the wastegate from opening until the desired pressure is reached.

Yes but tension of spring i weak that's why it's releasing the pressure

 

[Mark300zx]

The pressure builds up on the intake side of the engine, that pressure is the applied to the actuator/wastegate and then it bypasses exhaust gases, limiting the work for the turbo.

This won't happen with a HKS EVC as a solenoid controls the pressure on the actuator/wastegate, so the spring will not see any pressure until the HKS EVC lets it!

Can an expert with Leons confirm what I am saying is correct, as I am a newbie with Leons and don't want to lead this gentleman astray?

 

[jonathanp]

yeah thats all correct, except you also have back pressure inside the turbo the pushes the wastegate open from the inside.

my hybrid has the actuator set to open at 15PSI (I think bill tested this with a handpump) yet when running it actually opens at 12PSI as the back pressure is also contributing to opening the waste gate. Probably not a lot but might open the wastegate a couple of mm which stops the the turbo from producing anymore boost.

This is the same reason why I can run 23psi for most of the rev range but when it gets over 5500rpm I rarely see over 17/18PSI

 

[Mark300zx]

Isn't there any way of eliminating the back pressure as it pretty dire to tune a turbo car with this amount of Back Pressure?

 

[jonathanp]

don't know much about this but I think all you can really do is change the turbo or change the hot side and get a better exhaust manifold.

not sure if an external wastegate would be better but would probably cost a lot to fabricate something.

I asked forge sometime ago if they do any kind of actuator that can apply boost pressue to the opposite side of the actuator so you could use boost pressure as well as the spring (or no spring at all) to keep the wastegate closed. That way as backpressure rises so does boost keeping the wastegate shut. Not sure how you would blanace pressure on either side properly so that you can still open the wastegate though.

I was wondering if you could just reverse the way a wastegate works so under normal running boost is used to keep the wastegate closed and there is no spring on the actuator. Then T off from boost pipe keeping the actuator closed to go to the EVC which then goes to the other side of the actuator and pushes it open. So when you need to open the actuator it takes the boost away from one side feeds it to the other and with the help of the back pressure it should open. All theory though

If it works I want royalties, lol