I've read the manual and done a search but I still had a few questions about tuning boost using the Commander. From what I understand setting the Base Duty % is what ultimately leads to the boost #'s you are going to get, is this correct? And that the actual boost values you set are just "target" numbers, is that correct? Then what are those #'s actually used for? I've heard people say that they are used as the values at which beyond fuel cut occurs, but the manual is vague about that. The manual also mentions it's "self learning" feature, how does that work? I understand the underlying principles that by setting x% Base Duty you are setting how often the wastgate solenoid cycles and that in turn controls your boost, higher %'s equaling higher boost. But then is that absolute or are there variables like temps that are taken into account also? I ask because I have the boost settings that came with the PFC from Apexi, which are for .79 using 56% Base Duty. That used to work great, but now as the weather is getting warmer I'm only seeing .72-.74. Upping the Base Duty will probably result in regaining the lost boost, but with my "target" still set at .79 why isn't the "self learning" feature compensating? I'm sure there's something I'm missing from the equation, any insight would be appreciated. TIA!

 

I thought it was a little annoying to use the Commander to control the boost so I purchased the Blitz boost controller. Actually, I purchased it because it just came to the US and nobody really has it.

Good luck using the Commander.

 

I think i have a similar problem with my newly installed apexi pfc, my low boost setting is at .75 and 56% base duty %, however according to the commander I frequently am getting .80 and higher with a high of .88. So would lowering the duty %to below 56% be the solution to stop boost going above what it's set at? I have been holding back and havent even attempted to try my higher setting of .85 due to this.

Another thing is that my injector duty was only 59% when i hit .88, highest my injector duty has gone is 75%

thanks for any advise,

Rob

 

Bump...Excellent Questions, but no real answers from the experts?

 

yeah, i want answers...this basically sums up my questions

this group buy should yield a lot of newbies asking questions, so this would be great info if answered, unfortunately not a lot of guys with PFC's are still sequential

 

look at that time gap since the last answer on that thread...
I think I have to bump it again...

Great question. so where are you experts?

I don´t really understand these equations behind the bosst controller in the PFC, too.

 

This is all in the manual but I will repeat it. The % number is what duty cycle the solenoid will run at, giving you more boost the higher the number. The boost setting in the right column is your boost cut. When the PFC sees that boost level it will cut just like a stock ECU.

You have 4 different settings to configure and use.

 

the duty cycle number on the right is a baseline from which the self learning algorithms of the PFC will continue the wastegate and precontrol solenoids. If you set it higher, you have less of a chance of boost dropping or being too low, but you run the risk of a boost spike/creep. You don't get much control over the self-learning boost control in the PFC, just like you don't get much control over the self-learning idle.