Boost Control

stedciv · Post by **stedciv** » Tue Nov 11, 2008 3:58 pm

I have a JDM p72 with S300J
very happy with the way hondata performs

Done some reading and have a question.

since i have the S300J can i not run the boost control option since i have the square JDM ECU? i would like to be able to use Hondata and run 7lbs of boost in 1st gear then 10lbs in 2nd and once 3rd full boost at 14lbs. im running running mid 12s in the quarter, but cant get my 60ft under 2 sec to save my life even on drag radials! i would really like to hit low 12s maybe high 11s if i can get the boost control thru Hondata

can anyone give me some more info on this?

Post by **Spunkster** » Tue Nov 11, 2008 5:33 pm

You will have to use a US ecu and a regular s300. The JDM ecu does not have the capability to run boost control.

stedciv · Post by **stedciv** » Tue Nov 11, 2008 7:53 pm

well that sucks

do i have any other options with Hondata rather than getting a US ECU?

Post by **Spunkster** » Wed Nov 12, 2008 10:17 am

http://www.hondata.com/s300boostcontrol.html

It clearly states what ecu's can be used on our website. I would recommend selling your ecu and s300j and then buying a US ECU and s300.

stedciv · Post by **stedciv** » Wed Jan 07, 2009 9:05 pm

ok i found a us p72 ecu that will have boost control installed. have a couple questions about how i should can set it up.

im running a manual boost controller set at 14lbs? i want to run 7lbs and use the gear contol so i can run 7lbs in just first and second then the 14lbs after. how would i set up the Hondata solenoid? will i be able to keep my manual conroller?

FreshDA9 · Post by **FreshDA9** » Wed Jan 07, 2009 10:03 pm

you shouldnt need the MBC after buying the hondata unit.

Post by **Spunkster** » Thu Jan 08, 2009 10:19 am

In Smanager, got to Help, Contents and search for "boost control". You will find information on how to install the solenoid and how to setup the software.

stedciv · Post by **stedciv** » Sun Feb 08, 2009 8:14 pm

i currently have a manual boost controller hooked up like the picture shows.

my question is would there be any benefit for hooking up the Hondata solenoid before the manual controller, so that the manual controler would be an extra safety feature so i will not run more than 14lbs? or am i thinking safety too much? boost cut is already setup on my Hondata so it will cut out if the solenoid fails.

another question i have is if i do not need the manual boost cotroller, will i just replace it with the Hondata solenoid, or will i need to run vacuum to the top port of my wastgate? if i need to run it a different way, how do you guys reccomend doing that

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FreshDA9 · Post by **FreshDA9** » Sun Feb 08, 2009 8:39 pm

you can find all the information in Hondata's tech section on there site or go to help then contents in the Smanager software.

stedciv · Post by **stedciv** » Mon Feb 09, 2009 5:24 am

yeah i read all of that and know how to hook it up with out my manual boost controller but would there be any advantage to keeping the manual hooked up?

Martian · Post by **Martian** » Mon Feb 09, 2009 7:55 am

there is no point in keeping the MBC, it will further restrict air and you will overboost constantly.

stedciv · Post by **stedciv** » Tue Feb 10, 2009 8:37 pm

ok some more questions about the boost solenoid

i have a normaly closed solenoid and i hooked everything up and went for a test drive, i set the high and low boost at 5psi for first and second gear but when i drove it it went to 14 which is my boost cut. what am i missing? the solenoid clicks when i turn the key, so im certain that has power. on the actual boost solenoid the 1st port is ran to my pressure line, 2nd port is to the top of the wastgate and the 3rd is the filter. do i need to play around with the pressure vs duty cycle to get the solenoid to open when i want it to?

here is a screen shot of my boost control tab

V-Spec race development · Wed Feb 11, 2009 11:32 am

yes, you have to set your boost per duty cycle once you figure that out then you can set your boost by gear.

Post by **Spunkster** » Wed Feb 11, 2009 11:58 am

You must set your pressure vs. duty cycle table.

From the help file:

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.

stedciv · Post by **stedciv** » Thu Feb 12, 2009 7:38 pm

hopefullly if it is nice this weekend i can work on doing that. any suggestions on how to start narrowing things down?