Two nights ago my tuner ran into some issues tuning my car. The first pull looked fine well over 400 on low boost. As the car warmed up the fuel map was very very rich and it was about 50-70 hp down from the previous tune. This usual a sign of a boost leak i was told.. but they coudn't find any leaks..

I was also told from a friend that this could poss be an issue with my boost controller.. malfunctining???

I have the HKS EVC boost controller..? anyone have ideas whats wrong or advice?

Thanks

 

Without more info it's pure speculation. Good luck, hope it's something simple. I read about spark blow out problems on high boost w/UTECs (>500whp), and this could also cause rich conditions. But i doubt that is the problem if you can't hit 400whp.

I saw u only hit 7psi / 370whp on most/all of those pulls, what is ur wastgate springs set at?

 

I was thinking it may be the UTEC as well...

 

i dont know too much because im ova here in Kuwait waithin to fly home.. all i know is the car was tuned on the UTEC 4 months ago when the weather was still cold.. the car and tuner had no issues.. now im gettin this? I was gonna pick the car up this Sat but i dont know whats gonna happen now???

 

just got an email from the shop.. they swap BC an now the issue is gone? My question is why would a 600.00 BC fail like it did on my car? I have to get with HKS and see where the issue is with the EVC controller.. this dont make any sence??...

 

are you tuning it at " the shop " in ct?

 

Could fail for any of a million reasons. I am willing to bet the BC is fine, but you have a bad vac/reference line somewhere (cracked or leaking somehow) that the BC reads, if replacing the BC was truly the fix.

or the stepper motor could have just gone bad.....ya never know.....$$ does not translate into quality all the time.

Tom

 

Hopefully it was that simple... those runs although weaksauce were very consistent... looked like you were hitting spring pressure each time (7psi) and the BC wasn't doing it's thing.

 

funny you said stepper motor... "I dont have any clue what this is"

this is what the shop told me..

qoute"The BC will not hold any boost when it gets hot! No boost when hot!"

We have some choices to help fix this problem part bc.
1. you can leave the manual bc in your car and we can tune and your car will be ready for you~
2. found out you can just buy the stepper motor, vendor said they don't make it any more, They do have a new one out with a new motor design for $375.

if i go with the stepper motor will this fix things?? I need to make this desison in like the next few mins so i can get the car back on the dnyo tonight.. Thanks

 

I still dont know what stepper motor is.. also i found this on HKS..



EVC FAQ Section

Q: I am having trouble setting up the new EVC (45003-AK005, AK006, AK007 and AK008), the boost is not matching my target boost setting. Is my EVC defective?

A. The EVC is not defective. The problem is in your initial set-up.

After installing the EVC or reseting the EVC, you need to do the following in the initial set-up screens:


1. Units of Measure - make sure you are selecting the correct unit of measure - PAS (kPa) or PSI.


2. Wastegate Type - (S) is for swing valve or internal (actuator) wastegate type
(P) is for poppet valve or external wastegate type


3. Standard maximum boost is your "maximum" base wastegate spring pressure (NOT YOUR TARGET BOOST). It is recommended that you apply load to 3rd or 4th gear to obtain the base boost if you are not sure of your wastegate spring rate.
An indicator will show your base boost where the P.H. is on the top of the screen. You can manually turn the **** also if you already know your base boost pressure.


4. Target Boost - this is where you would enter your target boost. The range is from base boost to 36 PSI. (This mode automatically sets your volume A and B, but you can change it after your initial set-up). ** You must set your target boost ABOVE your base wastegate spring rate and cannot be the same as your factory or base rate.


5. Initial Offset Value - the initial set-up offset value is different from the volume A and B offset settings. This step must be done to ensure you are obtaining your initial target boost. Your initial setting will be at 100%.
You will now need to apply load to 3rd or 4th gear again to check that you are obtaining your initial target boost. An indicator next to the P.H. will blink showing you a real time boost pressure reading.
If you are not reaching your target boost, you will need to turn the percentage (%) gain up by turning the **** clockwise.
If your boost is going over your target boost, you will need to turn the percentage (%) gain down by turning the **** counter clockwise.
Once you've matched the target boost you will need to push the **** once to finish the initial set-up.

You are now done with your initial set-up and can now change from volume A and B by turning the **** left and right.
To change the target boost for each setting, push the **** in once and turn the **** to your desired target boost, then push the **** once again to set it.



Q: Can the EVC set my boost lower than what the base boost is for my wastegate?

A: No, the EVC cannot be set any lower than what the wastegate is rated at. To run the base wastegate spring rate pressure, hold the lower button with the (2) until the EVC turns off. With the EVC turned off, you are running the base spring rate boost pressure from your wastegate.



Q: My EVC is over boosting or continuously boosting and I am unable to regulate the boost pressure. Why is it doing this?

A: There can be a number of things that can be wrong with your EVC.

Make sure the EVC is set to the proper wastegate type. (S) is for swing valve or internal (actuator) wastegate type and (P) is for poppet valve or external wastegate type.
Check for continuity in the wiring, also make sure the vacuum hoses are as short as possible and properly connected to the stepper motor and turbo as this is a crucial step that may be missed when installing the EVC. (Please refer to your EVC manual for diagrams and examples).




Q: How does the offset setting work for volume A and B?

A: The offset settings affect boost response, however it also affects the maximum boost. The default setting for volume A/B is 100%. The setting range is between 1-199% in 1% increments.



Q: My EVC won't hold the target boost I set, my base spring is 10psi but I am trying to set my target boost for 24psi why is it not holding?

A: Typically most internal wastegate actuators will hold up to 100% over the base factory actuator pressure. The actuator may not hold additional boost pressure over that range and varies with applications. With aftermarket external wastegates, the same applies, however because spring combinations for each wastegate will vary by manufacture, it is recommended you check with the manufacturer for wastegate specifications.



Q: The figure displayed on my EVC and an aftermarket boost pressure gauge is slightly different, is this ok?

A: Whether the EVC and boost pressure gauge is taking it's readings off the same or different source/location, you may still see a slight difference in reading. If the EVC and gauge is off by 1.5PSI or less, it is within the tolerance range.




HKS USA

 

Quick rundown on how it works.

Manual boost controller changes the reference of boost vs vaccuum esentially that the Wastegate sees and "fools" the wastegate into opening sooner/later depending on what the valve is set at....you can think of it as a physical connection between the manual boost controller and the wastegate(s) for control.

A stepper motor is used on a electronic boost controller. There is logic done somewhere (wherever the processor is, either in the stepper motor box or in the BC box that you adjust).
When you set to a boost pressure (either bar, psi, or % of duty cycle), the BC computer opens/closes/adjust a valve (the stepper motor) that has the vaccuum/boost reference and is connected to the wastegates, to get to that boost. It can also do things like run Way beyond the boost you want to help with spool, and then quickly bring boost level to where you want it (so say you want 5psi....the stepper motor will be set to MAX booost while turbo spools, then at last second as it gets to 5psi, the stepper motor holds wastegates at 5psi level). So in the electronic BC setup, the Stepper motor is the physical connection to the wastegates, and the adjustments you make are to a user interface computer.

Thats a pretty simple broad idea of what is going on with Electronic v manual BC's.

What is your TT setup again? and motor setup (i.e. stock or built)

And do you think you change boost much?

Tom

 

He has a built motor with 20g Greddy kit/cosworth/etc

 

/\/\/\

You do not want a manual BC on this setup!

If the Stepper motor will work with your current BC I'd go with that (if they won't warranty or anything).

A good BC can makeup for some lag. And you don't want to rely on the WG springs to do all the work (which is what a manual bc would still do). You want the stepper motor to help with the inherit "slowness" of the springs to react.

Tom

 

I was also wondering WHY you are retuning it Lance?

Have you been back and driven it yet?

Good luck!

 

I wouldn't pick the car up until you've got all the issues worked out. You're in good hands, don't get too hasty!!!

 

where was it mounted that it was getting too hot? you could use a 80$ solenoid and have the UTEC control boost as well....

 

i cant return this brought it from some one on here but tried to contact them..

i think im gonna go ahead and tune on the maunal BC then order a new stepper motor in the mean time.. i should be back on US soil on Friday.. i will take a drive up to the shop to see whats what.. im already dingin a hole in my pockets with these recient issues..

 

Lance i got a brand new unit out of the box and it had a bad stepper motor so its not that unusual but it is rare.

 

You're gonna probably have to retune again once you change BC's. If I were you and in a hurry would get a standard boost solenoid ($80) hook it to the UTEC and call it a day.

 

OK here is the deal the car got tuned last night at a Safe conservative tune of 550 at the wheels.. This is with the current setup I have right now. And if am gonna see more I need to upgrade the Fuel system and swap out the UTEC which is maxed out right now.
So here is the plan I have now.. I’m gonna find a way to get a Brand New “Stepper motor” which will be installed in the next week or soo. Then return using the EVC system. In the mean time I’m gonna come home tomorrow and just get a chance to see and drive the car for the 1st time. I just wanna get use to driving it again and enjoy what I have so far.
After getting use to the current setup on the car as it is at 550. I will mostly likely in the future upgrade the fuel system and run maybe a Bosch fuel pump. http://www.bosch.com.au/content/language1/html/4560.htm
I will most likely do Full stand alone during this time too.