james81

Hi guys,

Tried searching but I'm unsure if any of the elec. boost controllers ( greddy profec B, blits dual, etc.) are able to constantly monitor boost pressure and adjust the W/G accordingly to keep boost consistant.

Or do they just set the W/G at a certain position when told to by the sender unit, and not adjust it automatically to prevent boost from varying?

Reason why I'm asking, I need one, just been using a manual 'tap' to control boost but its very inconsistant. Holds 0.5bar(abt 7psi) then after about 5krpm jumps to 1bar(abt 12-14psi).

I've plumbed according to the tial diagram so its all plumbed correctly. GT35R with 55mm ext. wastegate.

What would you reccommend I use for boost control?

Thanks

james81

bump?

arghx

iTrader: (3)

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/free-power-fc-single-turbo-probably-nonsequential-boost-control-846883/

the Power FC can do it, you just need a stock wastegate solenoid and a Datalogit to set it up

impactwrench

Hks evc

FD3S2005

iTrader: (11)

wouldnt that be most EBC? wouldnt that be the reason why you add the boost hose to the control unit?

james81

That's why I'm asking. No one's given a solid answer, yes or no. Not maybe or should.

Thanks impact wrench, HKS one looks like what I'm looking for.

darkphantom

iTrader: (2)

apexi avc ive seen is the cheapest compared to the HKS evc

arghx

iTrader: (3)

You're asking for a short answer to a long question essentially.

HKS EVC, Greddy Profec, Blitz, AEM... they're all basically the same thing. You turn a couple ***** or go through some menus and just keep fiddling with things until the boost is good enough. If you don't believe me, I have the instructions for every major aftermarket boost controller to explain the tuning process for each.

The exception is the AVC-R and the Power FC which are tuned completely differently than the other ones. On those other controllers, you give basic logic parameters (usually "set" and "gain" or equivalent, but sometimes more than that). The set value is a somewhat arbitrary number that puts the boost in the ballpark after you fiddle with it enough. Then adjusting the "gain" and sometimes "start duty" gives you a bit more adjustment to the control logic in order to keep the boost consistent to a degree. But you never have direct control over the solenoid's behavior. That's not necessarily a good or bad thing, it just depends what you are looking for. More control means a steeper learning curve and a greater chance of screwing something up.

In contrast the AVC-R has the most adjustability compared to other external boost controllers. You can tell the solenoid exactly what duty cycle to run in any particular gear, and you get control over the self-correction logic that will keep the boost from deviating. So you can ramp up the boost control solenoid duty precisely where the boost is falling off and give the AVC-R a certain level authority to make changes on its own. The Power FC does the same thing but it's not as precise as the AVC-R (although it's way cheaper to use if it is configured with the OEM Mazda solenoid). But the Power FC when used with the Datalogit has far better logging capabilities for troubleshooting boost problems, but if you don't have a Datalogit or don't want to use one that's not very useful to you. So there are tradeoffs.

Think about it this way: if you just want to get something that will hopefully make your problem go away, not be too much hassle, and not cost too much, just get the Greddy Profec S. It works in a similar way to most of the other ones but it is cheap and easy to use, and will probably get the job done good enough. If you have more time and money to spend then get the AVC-R if you want the extra precision. If you want the cleanest installation and have knowledge of and access to a Datalogit, go with the Power FC.