HKS wastegate actuator

[nissaner]

ever since i got HKS wastegate actuators installed at the end of last year, there seem to be a boost spike (i think it is...)

no matter what boost stage i set it at (using power fc commander via boost controller option with power fc) the boost goes all the way up to 1.35bar+ and gets this MASSIVE B_A_N_G!!!!! and the car jerks forward (engine sounds like i am missing gear.. if u know what i mean.. but i am on the same gear for example if i am accelerating full on hard on 1st gear , i would hit max boost (1.2bar that i set it at ) around 4500-5000rpm and it just keeps going up and when it hits about 1.33-1.35 bar around 5500-6000rpm B-A-N-G !!

r the springs in the actuators too tight? too much tension? i believe they r adjustable so i can loosen the springs and make the actuator to actually HOLD the boost at maximum boost i set it at and keep it like that till red line?

and also another thing, no matter how low i set the boost , the minimum it will go is 1.1bar... and i really want low setting (like 0.9 bar or 1bar) for daily driving...

any suggestions??

thank you guys/girls...

[Blitz]

Sounds like fuel cut to me John. Though I wouldnt have though that would be the case when you have a power FC.

Get it checked asap

[DREMEN]

Yeah fuel cut of some sort, injectors maxing out maybe?

[nissaner]

fuel cut with power fc??

will check the injector reading on the fc commander tomorrow morning...

[armbrusb]

nissaner,

Where did you get your actuator? How much did it cost? I am thinking of one, but haven't seen them around before.

[nissaner]

i got my mechanic to order them for me... give josh @ proconcept a ring on 02 98074488

[armbrusb]

Thanks nissaner,

I gave him a call and he said around $180. Did you end up fixing your problem?

I want to get a 14 psi actuator to alleviate some of the spike I am getting with my bleeder valve. Am I right in thinking an actuator will hep?

[Steve]

nissaner, I was under the impression that the HKS wastegate actuators have spring rates that are set - in your case, it sounds like you might be experienceing a bit of boost creep - what sort of turbo are you running - if it is a highflow, did they make the wastegate larger? I dont know about bang noises, could it be compressor surge?

Sorry if this isnt much help.

[nissaner]

i didn't get the problem fixed yet coz josh (mech) is out of nsw for the weekend for his pit crew job...

i am only using stock / not high flowed... will take out the actuator next week and see what the problem is... (regarding to that BANG !! its not the noise it makes but its more of jerking/shaking of the car... imaginable or am i too crap at explaining? )

will post up the result next wk..

[Steve]

Hmm, well I dont know why you would be getting boost creep on stock trubos - perhaps the wastegate has been plumbed up to the boost solenoid wrong? or you have vacuum leak in pipes between solenoid and actuator?

Jurking/shaking could be turbos reaching surge limit - but I dont know what that is for the stock turbos turbos. If it is surge limit, you would hear it too, as the reversion through the compressor is usually noisy. Hopefully your mech can sort things out. Just have to keep your foot away from the carpet for a while

Sorry not much help again

[nissaner]

Originally posted by Steve

Just have to keep your foot away from the carpet for a while

hehe... thats prolli the hardest task for all skyliners...

[nissaner]

loosened the springs today problem gone.. holding 1.2bar till 7350rpm very steadily (ran out of road...)

[nissaner]

btw, do i have to sacrifice any kind of power lose if i loosen the springs??

[Steve]

I think the idea of having tighter springs is to prevent wastegate creep. Sounds like the tension was too high for the boost you had set.

BTW how did you loosen the springs? I was under the impression that they are a sealed unit.

[nissaner]

how did I loosen the springs?? well, i left my car with my mechanic , came back in about 2hrs... it was all done .. too easy..~

i heard they r adjustable unit so u can adjust them anytime u want..

[Steve]

hehehehe thats definately the easy way.

[51jay]

Nissaner At 1.35bar sounds like you were getting boost cut.... it really rattles your teeth. Check what your boost cut is set to in the ECU

[nissaner]

how do i check what boost cut its been set in the ecu? (i use power fc) i know how to check what boost level i set to.... goto Setting and select Boost and u can choose setting 1,2,3 or 4 .. is this what u r talking about?

[51jay]

Somewhere in the settings you should be able to set a rev limit and a boost cut. I'm not familiar with the Power FC but someone on this forum will know

On my EMC Duelsport I have set the soft rev limit at 7500and the hard limit at 7650 the boost cut I set to 1.35 bar 'cos my stock injectors were maxing out at 1.25 bar.

[EVL R33]

Nissaner,

In the Settings menu go to boost and there will be 4 settings and solonoid duty cycle. The boost you set (ie 1.2bar) is where the PFC sets the boost cut. You then use the duty cycle to bring the boost level up to what you want. So if you have the PFC set at 1.35bar, and the duty cycle brings boost up to 1.35bar then you will encounter boost cut...

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