There are different storys on internet about hte boost controller kit for the power fc.

Some say it is not stable enough.

What to do.

Buy boost controller kit for the power fc or use a seperate controller like apexi avcr ?

 

the boost control kit is basically an avcr controlled by the ecu. i have the kit. i dont mind it. . . it works fine as far as my standard of performance goes. the only downside to it is that once the boost goes 25% above the preset limit, the powerfc cuts fuel. . . very scary. anyways, i LIKE the idea of having a standalone boost controller because you can set the power fc up to give you a margin of safety in the event of an overboost.

if i had to do it all over again. . . id get a standalone. . . much safer, and there are some really NICE units out there.

 

I like the Blitz DSBC because it has overboost protection, and four boost settings.

My boost setting are:
(1) 10psi
(2) 13psi
(3) 15psi
(4) 15.5psi
(overboost such if it hits 15.7psi it reduces to about 15.5psi)

 

https://www.rx7club.com/forum/showth...ight=boost+kit

https://www.rx7club.com/forum/showth...ight=boost+kit

 

running single turbo.

Ok a few facts.

+
easy setup
no extra electronics

-
fuel cut if boost is higher then programmed on power fc
lot of money for just a solenoid and map sensor
less control then on a seperate unit


If I find a good solenoid and can just plug it in to the wiring harnes and let power fc control it, right ?

The fuel cut I don't like that is the only reason I would go for a seperate controller

 

* Fuel cut can be adjusted on the PFC regardless of the optional boost kit.
* You can buy just the solenoid but that not the whole kit (3-bar, wire harness, etc).
* Kit uses "both" 2-bar "and" 3-bar map sensors and calibrates altitude adjustments.
* Price and simplicity is similar to HKS EZ but Calibrates altitude adjustements, plug-n-play controlled by PFC, no wire splicing, no added hardware or controller it uses the commander.

 

I am posting two graphs to give you a visual and quantitative example of the Profec Spec II boost controller compared to the Apexi Boost Control Kit solenoid option, not the whole kit.

In my experience running a single turbo with the Apexi solenoid and the PFC, the setup was unable to hold boost steady, you will notice from the graph the oscillations. This result was one of the better-controlled responses. I don’t recall exactly but I probably tried 30 or more different settings.

As you’ll notice from the Profec graph boost is controlled steadily.

I should mention that when running the sequential twins, the PFC alone controlled boost very well.

Btw I have an Apexi solenoid, I am willing to sell.

 

^ that's a bit misleading. You have it worded as "Apexi Boost Control Kit solenoid option". Not the whole kit? It's just the solonoid, should be labeled as such and not part of the kit.

Original poster asks about the complete kit, not the solonoid alone.

 

The intent was not to mislead. I guess I could have been more clear. What I meant was one option I used to control boost was the Profec and the second option was the boost control kit solenoid controlled by the PFC.

I believe the graphs still show a fair comparison.

Further the PFC controls the solenoid (boost) in both cases. The only difference is the kit contains a 3 bar sensor and the associated wiring for that sensor.


.

 

Say yes to controllers.

 

You used an Apexi solonoid.

The Apexi PFC optinal boost kit uses "both" sensors and adjusts on the fly to altitude changes.

The solonoid is just a solonoid, not to be confused as a partial PFC kit. You might as well call it a parial S-AVCR boost controler. People also think they can replicate the kit using a GM 3-bar and a Apexi solonoid but they can not.

 

The boost kit comes with the solenoid (same as S-AVCR solenoid), the map sensor and some wiring.

He has the same solenoid that is part of the boost kit.
The solenoid is going to perform the same whether you use the Apexi map sensor or not. So the oscillations present in his results would occur irrespective of the map sensor used.

 

Thanks, for your response. Of course, I agree.

I did use the Apexi solenoid and as the above poster noted it will make no difference on whether control is stable or not. The Apexi map sensor and. the stock 2 bar or both together merely provide a voltage source for the PFC measure boost and then to control the solenoid. At most the boost level may be offset (if it uses both the stock sensor and the 3 bar sensor) but should be stable at that target value, however I doubt this offset is present.

The oscillations in the graph were to illustrate that the solenoid and PFC were not maintaining stable boost and are an indication that the sensor contributed to the instability.

As you'll note the poster was interested in the solenoid alone, "If I find a good solenoid and can just plug it in to the wiring harnes and let power fc control it, right ?",

There was another individual that posted in this section using the Apexi solenoid only with success. I believe he had a single turbo.

 

" The oscillations in the graph were to illustrate that the solenoid and PFC were not maintaining stable boost and are an indication that the sensor contributed to the instability."

" that should have read....are NOT and indication that the map sensor contributed to the instablilty"

 

That is not what I ment.

I need a good setup to control boost.

2 options:
- power fc boost controller kit (incl map sensor)
- seperate boost controller.

it would be nice if there is no extra electronic unit.
So that is why I would choose power fc boost control.

But only if it works good.

 

Tru, as I stated.
True, as I stated and it is the same as the S-AVCR but no one is calling it a S0AVR kit are they?
No, I don't think so. If it's true I will post so. Fist off it's not a Apexi map sensor, it's a Nippon Denso 3-Bar map sensor. Sencondly as repeatedly stated it work "WITH" the Denso 2-bar map sensor "TOGETHER" and it wil "LEARN" the boost settings! I don't think anyone is understanding this at all.



It does on the fly altitude adjustments and learns the boost pattern.

You didn't use the kit, only the solenoid.

That's not true. He asked about the "KIT" and not the solenoid alone.
As stated many times, the solenoid alone does not a kit make.

I will post my results when I can since the optional kit was intended for single turbo's over 16lbs of boost.

 

http://www.apexera.co.jp/carlife/

 

Originally Posted by Guyver
The solenoid is going to perform the same whether you use the Apexi map sensor or not. So the oscillations present in his results would occur irrespective of the map sensor used.

“No, I don't think so. If it's true I will post so. Fist off it's not a Apexi map sensor, it's a Nippon Denso 3-Bar map sensor. Sencondly as repeatedly stated it work "WITH" the Denso 2-bar map sensor "TOGETHER" and it wil "LEARN" the boost settings! I don't think anyone is understanding this at all.”

I think we do understand this, however the PFC by itself will learn with the stock 2 bar sensor. It doesn’t need 2 sensors.

“It does on the fly altitude adjustments and learns the boost pattern.”
.
Define on the fly altitude adjustments and how this is accomplished. As previously stated the PFC with the stock 2 bar sensor will learn. It would be interesting to hear Apexi’s explanation on how this altitude adjustment works with both sensors and why it is more beneficial than the Power–FC and the stock map sensor. With 2 sensors providing 0-5 volts, which one is correct? Is one a reference? Is some spare circuitry activated when the additional 3 bar sensor wiring is connected to the PFC?

“You didn't use the kit, only the solenoid” I never stated I used the kit.

That's not true. He asked about the "KIT" and not the solenoid alone.
As stated many times, the solenoid alone does not a kit make.
That statement was a quote from his thread although not consistent with his original post. However, I will agree since he has since clarified his intent.


Using the quote from the Apexi site :

The Boost Control Kit is an optional kit designed to control boost through the Power FC. Simple connection to the Power FC allows the user to access a full self-learning boost controller. The Power FC allows up to 4 different boost presets for any stage of driving. The high grade solenoid valve is the same one used in our Super AVC-R boost controller. As with the S-AVCR, the Boost control kit allows increased boost response and boost stability at high RPM's. Have your EMS & your boost controller thorugh one system and one display, EVERYTHING controlled at the touch of a button....

It states…is an optional kit designed to control boost THROUGH the Power FC, so how does the Power-FC control boost? Here’s what Apexi says on page 28 FC-COMMANDER Instruction Manual, “The POWER-FC controls boost by using the duty cycle of the solenoid valve. The duty cycle is the percentage of open and closed cycles for the solenoid valve in a given amount of time.”

It should be noted that the Power FC can control boost with the stock solenoids for the stock sequential turbos. So in other words the Power FC is controlling the duty cycle of either the stock solenoids or the Apexi Boost Control Kit solenoid.

The 3 bar sensor merely provides a voltage that corresponds to a 3 bar value vs. a 2 bar value.
Whether a 2 bar sensor, Apexi’s 3 bar sensor or a GM 3 bar sensor is used is irrelevant to duty cycle.

With respect to the altitude adjustment, I wonder why the Power-FC doesn’t include an additional 2 bar sensor and relies solely on the stock 2 bar when controlling the stock twins. As I stated previously my Power-FC controlled boost fine on the stock twins.


GoRacer I noticed you have the kit. Have you ever considered removing the 3 bar sensor from the system and setting your pim back to the normal setting, then running less than 1 bar and see how well the Power FC controls boost with just the Apexi kit solenoid and the stock map sensor?


Some comments on the Apexi site quote: I wasn’t aware that there were 4 different boost presets? “the Boost control kit allows increased boost response and boost stability at high RPM's , what is meant by this statement, increased boost response and boost stability when compared to the PFC without the kit, or compared to what? Does this imply the PFC by itself does not have favorable response and stability?









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