How to set up the Tru-Boost controller

[evolip]

i stay at singapore !! where i can buy tru-boost controller

[one eyed willy]

hi, just got my gauge and had a few question specific to my set up. i just custom fabbed my turbo kit for my 07 mustang and have not run it yet. i want to make sure i under stand some of the setting on the gauge before i run the car.

what is scramble boost and scramble boost time used for??

im using a  turbonetics wastegate with a 5 PSI spring,most i ever plan to run is 10-12 PSI.

so when setting up the gauge this is what i have gathered so far:
scramble boost-not sure what to do yet?
scramble boost time-not sure what to do yet?
sensor selection = 1- leave this as is
alarm setting= 30-set to 12-13 or in that range (these numbers stand for PSI,correct?)
Wastegate crack=2.0-after finding my A and B setting, i increase this number until i get spikes then back it back down.
bar graph=30- set this to 12
boost setting a =.00- run the car and find my low boost setting of 6-7 PSI
boost setting b =.00- run the car and find my high boost setting of 11-12 PSI
    (then go back and adjust the wastegate crack)

so depending on the scramble options,i should be good to go at this point? any other things i need to know or set up?

now once i have the A,B settings, i can toggle between them in "run " mode by pressing the left button.the right button is just for checking on the peak boost?

so when i run the car for the first time,i could change my alarm and bar graph, and leave the A and B settings alone until i test them out and slowly increase them until i get the PSi that i like?

thanx alot.

[SB]

The Scramble Boost feature is designed for those occasions where you want a quick burst of speed for a few seconds. For instance, you may encounter a very tight racetrack where you prefer to run low boost to make the car a bit more forgiving at low speed. That same track may have one or two long straights and you may want to turn the boost up during those straights only.

You could configure your Mode A setting for low boost (for instance, 20% duty cycle may get you 8 psi with a certain setup) and then configure your Scramble Boost setting for more boost (for instance, 60% may get you 12 psi on the same setup). 

With this setup, you could drive most of the track at low boost and then press the scramble boost button when you want more power during those straights. Scramble Boost Time is how many seconds you want to stay in high-boost mode after you've pressed the Scramble Boost button.

[one eyed willy]

thanx alot.

rough estimate...i have a 5 PSI spring in my wastegate. what would I  set the A boost level to so it would hit 7 psi, and the b level too to hit 10 psi? i know it would only be a rough estimate, looking for a place to start.

[one eyed willy]

ok,i have started to play with this thing.on the dyno

first pull had it turned off to get 5 PSI, it hit five and started dropping off alot. so i set it to setting A, and upped the crack pressure and it held the boost very good, went up to 6 psi and it only dropped off a tad, so on setting B i went o 9 psi and it only dropped off 1/2 psi.

does this sound normal,if i keep playing with the crack pressure should it hold th boost better?

A=30 duty =6.08 PSI
B=60duty  =9.22 PSI
crack pressure is at 5.20

now another thing i noticed was it seems like the dyno boost reading and my gauge are about 2 PSI off, my gauge reads a higher PSI.

[slowbaru]

i just setup my tru boost in my 05wrx, i must say that i am disappointed. i previously had a prodrive 3 port solenoid, and a .9 wastegate spring in my tial 44. with the prodrive i was able to hold boost 19.5psi, all the way to redline. now i upgraded my turbo to one that spools faster and holds better top end, i changed my wastegate spring to a 1.1 bar, and i changed my boost controller to the tru boost. i had to set the crack pressure to 4 in order for my car to not spike, and it still spikes a little bit. the tru boost sucks at holding boost, it tapers to 16 psi by redline. it makes the car feel super laggy. i have the duty cycle set at 35%

is there something wrong? or is this just how the tru boost is?

i think i'm going to go back to a 3 port solenoid controlled by the ecu.

my car spools faster and feels better when i turn the truboost off and run wastegate pressure.

[Mike_GSX]

Hi, got a little question, just to be sure,

there is no menu on which I can adjust boost with + / - `by 1psi right?
All I can do is set for example 20% duty cycle, then drive and see where the boost goes (what peak boost the gauge shows)
set it to 30% and drive and read on the gauge again where it goes.

Right?

Because my question is, if I press left,... I can see a A in the gauge, now with + and - i can go for example from 20 to 19 or 21,22,... is that boost in psi or is that also % of duty cycle?

Thanks a lot for your help. Since I'm sitting here in Switzerland and my mother tongue is not english, it makes it kinda hard to understand all that tech talk.

Mike_GSX

[SB]

Mike_GSX,

You are correct, the A and B settings let you adjust the solenoid duty cycle from 0-100%.
There are only a few settings that use PSI:   the SPr setting (below this pressure the solenoid duty will be set to 100%), the Bar Graph Full Scale, and the Alarm.


slowbaru,
Sorry to hear that. The Tru-Boost was designed to be simple and easy to use. There is not a "Boost Target" because this would require a few other settings and options, increasing complexity beyond what we think many end-users want to deal with. Instead, the Tru-Boost will simply use the exact solenoid duty cycle that you tell it to use. If your setup requires a significantly higher duty cycle to sustain the same boost at high RPM you may want to investigate the mechanical reasons that could be causing this and/or use something that is more programmable. Our EMS has quite a bit of flexibility in its boost control methods (although it is significantly more complex and may take longer to configure), and I suspect most other standalones and reflash tools may have similar capabilities.

[PDK]

What are you guys running with stock sr20dets?  wastegate spring is supposedly 7psi.  id like to run 9 or 10 on setting A and around 12 on B

any suggestions?

[Mekanyx]

Hi, guys

I just installed my Tru-boost, and it work find, once you play a lot with the menu its easy to use
there is my number

engine: 7M-GTE, V8 Lex AFM, 550cc, FPR, stock new CT-26 (spring rate is 6.8-7)

B setting

- Spr 6.0
- Duty B 69%
- 14-15.4 PSI but I still spike at high gear at 16.4 PSI

to reduce boost spike I need to lower le Spr is that right??

the Alarm set what the LED light on the grey wire??

Thankx for the reply...

[Mekanyx]

The Alarm light is OK the first one was broken, that why it doesn't light up...

But I still have some boost spike that bug me...

[trbo2dr]

But I still have some boost spike that bug me...

Yeah reduce your spring setting.  The instructions say that the Tru Boost starts to open the wategate 1 psi before your setting value.  If you have it at 6 psi the wastegate is starting to crack at 5 psi.  I think I've seen the recommendation to set your spring setting to a couple of psi below you wastegate spring pressure.

[Mekanyx]

 I think I've seen the recommendation to set your spring setting to a couple of psi below you wastegate spring pressure.

I think I know what my problem is my CT-26 I need to shim the wastgate so doesnt open to quick, cuz with to much pressure in the turbo, the wastegate open by him self...

Im gone shim the wastgate, than play on my tru-boost to set the boost that I want and should have less problem with the boost spike and holding my boost...

That the 2 big problem of a CT-26, this winter im gone a fine a new and better turbo for next summer

[NS]

A four part series of Tru-Boost videos is now available for watching HERE.

[Mekanyx]

awesome video very helpfull