Single EFR PFC boost control, again
02-19-23, 08:50 AM
#1
Single EFR PFC boost control, again
There is some kind of mental block with me and boost control. Every ebc I've tried, or let a tuner try we run into issues and end up going back to the turbosmart boost tee. Had tried to understand the profec that was in the car when I got it, then went to the manual boost tee, decided to go back to an ebc using the pfc, tried the efr solenoid plugged to the precontrol plug, that didn't seem to work (questionable tuner that time), then realized I may have not been using the correct plug, so ohmed out and repinned that plug to 4v (precontrol) and retried the efr solenoid. Could not get steady boost on the dyno, later found out had a huge boost leak. Now all that is sorted, the car runs great, gave up on ebcs, currently back on the turbosmart boost tee. To my knowledge the only thing I haven't tried is the greddy/apexi style 2 port on precontrol with sequential turned off, couldn't get the efr solenoid to work in this arrangement. Help. I'm lost, and my brain hurts.
Last edited by aplscrambles; 02-19-23 at 08:55 AM.
02-19-23, 08:54 AM
#2
To further complicate matters, I have blitz dual sbc that I actually started installing in the car last night. After pulling about a mile of wires and hoses, I realized I am more interested in simplicity than having a more comprehensive controller, especially if I can somehow get the pfc to work without adding a bunch of extra boxes and electronics and wiring and complexity. You know, K.I.S.S.
02-19-23, 11:24 AM
#3
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well first, with the Profec its not you its them. the Profec A is really hard to setup.
and then second what are you trying to do? more boost? how much more boost? quicker response?
and then second what are you trying to do? more boost? how much more boost? quicker response?
02-19-23, 12:07 PM
#4
the profec b2 is what we default to when using the power fc. its powerful, easy to use and simple to install only needing power, ground and a vacuum line.
the complex japanese ebcs out there are absolutley wild and cryptic in most cases to get to work. the profec 2 along with the power fc is the perfect combination. we have been able to get +/-0.1 bar variance with using the profec for boost controller with a power fc. ditch what you have and use a profec b spec 2. it will allow you to control boost as if you had a more powerful ecu.
the complex japanese ebcs out there are absolutley wild and cryptic in most cases to get to work. the profec 2 along with the power fc is the perfect combination. we have been able to get +/-0.1 bar variance with using the profec for boost controller with a power fc. ditch what you have and use a profec b spec 2. it will allow you to control boost as if you had a more powerful ecu.
02-19-23, 04:39 PM
#5
This may sound silly, but I actually want less boost. I want a steady 15psi or 1 bar setting that I could adjust upward if I ever saw an extreme need. I want simple installation, reliable, set and forget basically. I have no real problem with the mbc/turbosmart boost tee we've been using, just seems rudimentary, since I'm running the latest and greatest turbo setup, and yes, though I think the spool with my 8374 is ok, I can't help but wonder if it could be better with a properly setup ebc.
Last edited by aplscrambles; 02-19-23 at 04:44 PM.
02-19-23, 04:42 PM
#6
the profec b2 is what we default to when using the power fc. its powerful, easy to use and simple to install only needing power, ground and a vacuum line.
the complex japanese ebcs out there are absolutley wild and cryptic in most cases to get to work. the profec 2 along with the power fc is the perfect combination. we have been able to get +/-0.1 bar variance with using the profec for boost controller with a power fc. ditch what you have and use a profec b spec 2. it will allow you to control boost as if you had a more powerful ecu.
the complex japanese ebcs out there are absolutley wild and cryptic in most cases to get to work. the profec 2 along with the power fc is the perfect combination. we have been able to get +/-0.1 bar variance with using the profec for boost controller with a power fc. ditch what you have and use a profec b spec 2. it will allow you to control boost as if you had a more powerful ecu.
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02-19-23, 06:55 PM
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02-21-23, 09:31 PM
#12
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I had first installed a Blitz Single solenoid EBC but boost would come on strong with a boost spike before it settled down.
This was back in 1999 when the PFC was introduced to the USA. Then I converted it to the Blitz DBC Spec-R which used a dual solenoid with a different harness for the 2 solenoids.
This worked good with a minor initial boost spike. Used it even after going single turbo at 18-19 psi boost. Then in late 2020 the Blitz died.
It was replaced with a E-Boost Street unit. This worked terribly no matter what I tried following their instructions. I tried many ways of plumbing to no-avail.
It would have an initial boost spike by 2 psi when running 18-19 psi upper limit.
I mostly fixed it by getting a second solenoid from them and created my own dual solenoid unit. Even so the E-Boost is harder to set up than the Blitz was.
The 13B-REW even with blue printed cleaned up stock ports and good medium flow single turbo just spools up to fast for some EBC's logic.
This was back in 1999 when the PFC was introduced to the USA. Then I converted it to the Blitz DBC Spec-R which used a dual solenoid with a different harness for the 2 solenoids.
This worked good with a minor initial boost spike. Used it even after going single turbo at 18-19 psi boost. Then in late 2020 the Blitz died.
It was replaced with a E-Boost Street unit. This worked terribly no matter what I tried following their instructions. I tried many ways of plumbing to no-avail.
It would have an initial boost spike by 2 psi when running 18-19 psi upper limit.
I mostly fixed it by getting a second solenoid from them and created my own dual solenoid unit. Even so the E-Boost is harder to set up than the Blitz was.
The 13B-REW even with blue printed cleaned up stock ports and good medium flow single turbo just spools up to fast for some EBC's logic.
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aplscrambles (03-02-23)
02-25-23, 06:50 PM
#13
If you want to run the Power FC boost control, easiest is to install the solenoid to the wastegate solenoid output pin (not Precontrol, although I initially recommended this a long time ago) and set the sequential turbo control to off. It has its own way of tuning, see my earlier threads on this.
Almost any external EBC controller will work. They all basically work the same way, but most have poor instructions. See my threads.
Electronic Boost Controller Comparison Chart - RX7Club.com - Mazda RX7 Forum
Long-term testing with Power FC single turbo boost control - Page 2 - RX7Club.com - Mazda RX7 Forum (also see post 31)
Almost any external EBC controller will work. They all basically work the same way, but most have poor instructions. See my threads.
Electronic Boost Controller Comparison Chart - RX7Club.com - Mazda RX7 Forum
Long-term testing with Power FC single turbo boost control - Page 2 - RX7Club.com - Mazda RX7 Forum (also see post 31)
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aplscrambles (03-02-23)
03-02-23, 10:38 PM
#14
I had first installed a Blitz Single solenoid EBC but boost would come on strong with a boost spike before it settled down.
This was back in 1999 when the PFC was introduced to the USA. Then I converted it to the Blitz DBC Spec-R which used a dual solenoid with a different harness for the 2 solenoids.
This worked good with a minor initial boost spike. Used it even after going single turbo at 18-19 psi boost. Then in late 2020 the Blitz died.
It was replaced with a E-Boost Street unit. This worked terribly no matter what I tried following their instructions. I tried many ways of plumbing to no-avail.
It would have an initial boost spike by 2 psi when running 18-19 psi upper limit.
I mostly fixed it by getting a second solenoid from them and created my own dual solenoid unit. Even so the E-Boost is harder to set up than the Blitz was.
The 13B-REW even with blue printed cleaned up stock ports and good medium flow single turbo just spools up to fast for some EBC's logic.
This was back in 1999 when the PFC was introduced to the USA. Then I converted it to the Blitz DBC Spec-R which used a dual solenoid with a different harness for the 2 solenoids.
This worked good with a minor initial boost spike. Used it even after going single turbo at 18-19 psi boost. Then in late 2020 the Blitz died.
It was replaced with a E-Boost Street unit. This worked terribly no matter what I tried following their instructions. I tried many ways of plumbing to no-avail.
It would have an initial boost spike by 2 psi when running 18-19 psi upper limit.
I mostly fixed it by getting a second solenoid from them and created my own dual solenoid unit. Even so the E-Boost is harder to set up than the Blitz was.
The 13B-REW even with blue printed cleaned up stock ports and good medium flow single turbo just spools up to fast for some EBC's logic.
03-02-23, 10:39 PM
#15
@arghx Sounds like I may have misread some of your older threads from years ago. I suppose I could repin my plug from 4v (precontrol) to 4u (wastegate solenoid) and try pfc boost control again with a greddy or apexi solenoid. Haven't tried this arrangement before.
Last edited by aplscrambles; 03-02-23 at 10:45 PM.
03-03-23, 08:59 AM
#16
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@arghx Sounds like I may have misread some of your older threads from years ago. I suppose I could repin my plug from 4v (precontrol) to 4u (wastegate solenoid) and try pfc boost control again with a greddy or apexi solenoid. Haven't tried this arrangement before.
03-03-23, 02:55 PM
#17
@arghx Sounds like I may have misread some of your older threads from years ago. I suppose I could repin my plug from 4v (precontrol) to 4u (wastegate solenoid) and try pfc boost control again with a greddy or apexi solenoid. Haven't tried this arrangement before.
03-08-23, 11:10 PM
#18
yeah stuff that is sort of settled knowledge right now was just stuff I (and others) was figuring out as I was going along. I initially used precontrol and "tricked" it into thinking sequential turbo control was on, until somebody (maybe Banzai Racing) pointed out that was unnecessary and you can use the wastegate pin.
Last edited by aplscrambles; 03-08-23 at 11:19 PM.
03-10-23, 12:57 PM
#19
Sorry for the confusion. I just reviewed that thread (it's from over 10 years ago). Either way will work (precontrol pin + sequential turbo control off, Banzai method) or wastegate pin with sequential control on and sequential turbo transition set very low, as I originally described in that thread. That's with the MAC solenoid and the Greddy solenoids and the factory Mazda solenoids. I have not confirmed it with the BorgWarner solenoid. That being said, a lazy Google search tells me that it runs at 32hz, and for some reason I have 31hz in my mind as the frequency of the PFC output. I don't even remember where that number came from as it's been so long. What I'm saying is that it should work, from my general experience, but I don't have data to back that up. That being said there are some threads from the past you can check out (these are very old) and you should be trying different settings. First running with boost control solenoid unplugged, then ramping up the settings and taking logs for each one. Each test should have a datalog.
Long-term testing with Power FC single turbo boost control - RX7Club.com - Mazda RX7 Forum shows how to ramp up the boost control settings Need some help with PFC Boost Controller Tuning - RX7Club.com - Mazda RX7 Forum
Do you have a diagram of the plumbing you configured? If I had to guess it's a plumbing error or a tuning error/misunderstanding of how to set it up. See this thread: Testing MAC vs. OE solenoid valves and other boost control strategies - RX7Club.com - Mazda RX7 Forum .
Long-term testing with Power FC single turbo boost control - RX7Club.com - Mazda RX7 Forum shows how to ramp up the boost control settings Need some help with PFC Boost Controller Tuning - RX7Club.com - Mazda RX7 Forum
Do you have a diagram of the plumbing you configured? If I had to guess it's a plumbing error or a tuning error/misunderstanding of how to set it up. See this thread: Testing MAC vs. OE solenoid valves and other boost control strategies - RX7Club.com - Mazda RX7 Forum .
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