I've read the help file..don't understand boost control 100%

[02SilverSiHB]

Right now I have a 7psi spring in my tial wastegate.

I have a 4 psi spring on the way.

Right now, I just want to run 9psi through all gears.

Later when I receive my 4psi spring, I want to run 4psi(1st) 6psi(2nd) and 10psi(3rd-6th). (forthe track, but leave it at 9psi for the street).

I understand how to hook up the solenoid.

What I don't understand is the help file on settings for boost control.

What I think I know...let me know if I'm wrong:

1st I want the maxiumum boost at 0% duty selected under "solenoid config"

2nd, for the "solenoid characteristics"...leave it alone at 15% and 85%

3rd, set the solenoid activation pressure at maybe 6.0 so it (solenoid) will start to react to the boost (making it less stress on the solenoid since I have the 7psi in right now)

4th, I'm confused. Fixed duty cycle...is this what I want to select to stay at one psi level for all gears? If so, what the heck do I set it at?

Leave it at 40%? But how do I tell it what psi I want for all gears? Do I go under "Pressure vs Duty" and put down for the "Duty %" the number 40% in all columns and put whatever psi I want for each column to stay at for all gears???? So put 9 to stay at 9psi the whole time?

I'm confused. I've read it numerous times. Anyone?

[Hondata]

First set the boost limiter so nothing bad can happen.

Right now, I just want to run 9psi through all gears.

Select 'fixed duty cycle'. Starting at 15%, increase the duty cycle until you get 9 psi. If you have a 7 psi spring then you'll probably be at around 25% duty cycle.

3rd, set the solenoid activation pressure at maybe 6.0

The activation pressure must be below the spring pressure, otherwise you'll boost spike. Set it to 2-3 psi for a 4 psi spring.

4th, I'm confused. Fixed duty cycle...

Select 'fixed duty cycle'. Starting at 15%, do a run and datalog the resulting boost curve. Increase duty cycle, repeat the run and datalogging part. Keep going until you reach the maximum boost you want to use. You should end up around 50 - 55% duty cycle to reach 10 psi with a 4 psi spring.

With the information from the runs above fill in the 'boost vs duty cycle' table. e.g. if at 15% duty you made 4 psi, enter 4,15 in the first column. Keep going until you have entered the data from the runs above. For the rest of the table just guess the boost and duty cycle values - as long as they both increase, everything will be fine.

Now switch the 'Control Method' to 'Gear based Duty Cycle'.

Fill in the 'Boost vs Gear (low)' with your target boost.

Check the gear ratios are correct.

Test and if the boost is incorrect, look at a datalog to see what the duty cycle was and check that it seems sensible compared to the datalogs you did initially. I graph the boost vs duty cycle curves in excel and interpolate values.

There are big differences with the pressure source for the wastegate (and solenoid). I found that using pressure from the compressor discharge gave a flat curve at low boost but had a big drop at high rpm and moderate boost. This was from the pressure drop across the intercooler. Moving the pressure source to the intake manifold gave a slightly high boost curve in the mid range and much less drop at high rpm. Some people prefer to use the compressor outlet and intake manifold tee'd together (sounds strange but they swear by it). With rubber hose it is fairly easy to try different sources until you find the best one.

You don't need to use the high/low boost option. Just set it to 'always off'. The idea behind this is that you could use two different 'Boost vs Gear' settings, switchable by an input to the ECU. e.g. you could have a higher boost setting for slicks, or a lower boost setting for wet weather.

[02SilverSiHB]

okay, this makes more since now thanks!

[02SilverSiHB]

thanks Hondata! you were dead on. 25% is just right imo. I went from 15% like you said and went from there. Once I started doing it, it makes since.

Thanks again!

Can't wait for the 4psi spring from tial