Boost control with the Kpro

Aft3rburn · Post by **Aft3rburn** » Tue Oct 18, 2005 9:06 pm

I'm trying to figure out what my settings SHOULD be in the Kpro..
I also have the GM boost control solenoid.

I have the 5psi spring in the Evolution WG.
Using Kpro 1.2.0.7
max psi I want at any time is 9.8psi.

I've been trying every setting I can.. nothing seems to work.
I'm unable to boost over 5psi.
I have the solenoid activation set at anything, and it still won't let me top 5psi.

I'm at wits end trying to get this running right, and am on the verge of ripping this boost control solenoid out and calling it a night...

edit- I'm trying boost by gear and fixed duty cycle with no effect

Aft3rburn · Post by **Aft3rburn** » Thu Oct 20, 2005 10:14 am

anyone?

If not, I'll rip the boost control solenoid out and chalk it up as a $30 loss.
My confidence in doing these projects is low because of this. I was planning on getting the 3 bar map sensor, but since I can't figure this out, I won't be doing this upgrade.

Post by **Spunkster** » Thu Oct 20, 2005 11:39 am

TAKEN FROM THE HELP FILE - HELP, CONTENTS, SEARCH FOR BOOST
___________________________________________________________

These boost control parameters determine how the ECU controls the boost control solenoid.

Enabling Boost Control

The purge valve is used to run the boost control solenoid, as it is a duty cycle controlled output.

Settings

These settings contain the solenoid characteristics.

Configuration - normally will be maximum boost as 0% duty. If your solenoid is connected so that minimum boost is made with the solenoid off, set this to maximum boost at 100% duty.

Minimum and maximum duty cycle - set the solenoid duty cycle limits.

Solenoid activation pressure - sets the point where ECU starts to use the solenoid to control boost pressure. Normally this can be set a little below the minimum boost pressure in order to minimum wear on the solenoid.

Control Method

There are two control methods: a fixed duty output, where the solenoid is run at a fixed duty cycle and boost will be about the same in each gear, and a gear based duty cycle where boost can be varied in each gear.

A fixed duty cycle has one parameter - the duty cycle. When the settings are configured for a normally open solenoid the actual duty cycle is inverted so that a higher duty cycle will increase boost.

A gear based duty cycle uses two additional tables to determine duty cycle. First the Boost vs Gear table is used to find the target pressure for the current gear, then the Pressure vs Duty Cycle table is used to calculate the solenoid duty cycle to reach the target boost.

Pressure vs Duty Cycle

The Pressure vs Duty Cycle table contains a lookup of pressure valves which correspond to a solenoid duty cycle. The values for this table must be set by using a fixed duty cycle (see Control Method) and noting the resulting manifold pressure. Note that different ambient conditions will result in slightly different boost pressures for the same duty cycle.

Low/High Boost

This allows two different boost settings (by gear) to use used, based on a switch input.

Boost by Gear

These tables set the target boost for each gear. The pressure units are determined by the combo box under Settings.

Aft3rburn · Post by **Aft3rburn** » Thu Oct 20, 2005 3:43 pm

Thank you VERY MUCH!

Aft3rburn · Post by **Aft3rburn** » Thu Oct 20, 2005 3:44 pm

also... what wire SHOULD I have hooked into the ECU? I want to re-verify that what I have wired is what I should have done.

weltall · Post by **weltall** » Thu Oct 20, 2005 3:57 pm

yeah your "help" file says to use pin e21 on the ecu but i have been told that it is a typo and we are supposed to use b21

anytruth to this???

Aft3rburn · Post by **Aft3rburn** » Thu Oct 20, 2005 4:01 pm

ok... reading through this didn't give me any additional insight...

I set the solenoid activation to anything( even 9psi), I still can't top 5psi.

I have the 5psi spring installed in my Evolution wastegate.
I set 1st gear to 6psi under the boost by gear, it still won't go above 5psi.
In 2nd gear and on up, I have it set to 9.8psi..It still won't go above 5psi.

I remember seeing a setting in there about "always on" or "always off".. . what should I have? I don't have any other switches to control hi verses low boost settings.
What should I have my settings at?

racing-honda · Post by **racing-honda** » Thu Oct 20, 2005 4:15 pm

yeah your "help" file says to use pin e21 on the ecu but i have been told that it is a typo and we are supposed to use b21

anytruth to this???

yes... at least if it was a typo in 1.2.0.7...
In 1.2.0.9 it says B21 and it is B21

Aft3rburn · Post by **Aft3rburn** » Thu Oct 20, 2005 8:26 pm

ok.. as far as I know, looking at the connector, it'll be the middle connector of the 3 that plug into the ecu.. now which wire is it supposed to be.. I just wanna make sure I have it hooked up right...and.. what settings?
Always on? always off? I just can't get this setup to >5psi with the 5psi spring in there.
I was told that if you want less boost in a gear, put the lowest spring you can for what target low boost you want.. so in 1st, I want 6psi even though I have the 5psi spring in there...and be able to boost to 9.8 psi in all other gears

racing-honda · Post by **racing-honda** » Fri Oct 21, 2005 4:15 pm

Mmmm...
I think I got screwed up myself a litle bit here...

Please completely ignore what I wrote before. I've edited to remove the bs

It is definitely B21 not E21.
B21 is the PCS signal used by k-pro for boost control , E21 is the VSV signal - I just checked it in the Honda workshop manual.
Furthermore version help file 1.2.0.9 also says it's B21.

Connector B is a 24 pin connector (the middle one of the 3 used ones because C and D are not used unless you would have automatic transmission).
The wire on B21 should be coloured yellow/blue.
Hopefully this is enough info to verify if you got the correct wire.

Aft3rburn · Post by **Aft3rburn** » Fri Oct 21, 2005 4:42 pm

thanks:)

yup, I got the correct wire... Yellow with blue stripe

silver rsx-s · Post by **silver rsx-s** » Tue Nov 15, 2005 7:33 pm

set your solenoid activation pressure to 3psi and set duty cycle (fixed) to 20%
see what it does. if its below 9.8psi, raise duty cycle, if its over, lower duty cycle

btw i hope you have a 2bar or 3bar map sensor as stock one only reads to 9.8psi, which is where boost cut should be if you have stock sensor, if so, tune for 9psi and set boost cut to 9.8psi