What I thought before
Well I was kind of skeptical of the profec B being as it costs nearly 300 dollars. Thinking...hey it does the same thing as a MBC what can so great about it to justify the extra 200+ dollars...besides the cool little digital box they send you. How wrong I was.

How the story goes...
Well a friend called me up and wanted me to install it into his 240sx (SR20 swap built bottom end, headwork, HKS this and that, greddy fmic, GT35r, HKS camp system etc etc etc) So I agreed figuring that to get to drive it around for a couple of hours was well worth the simple install. So after routing the vacuum lines from the fpr/intake manifold and the wastegate actuator, routing the valve wiring and vacuum line for the incar digital gauge thats built into the profec. Then getting a power from the stereo and a ground on the chassis... started it up. And fiddled with the settings.

The settings can be confusing...
Unlike a normal MBC it not just click...click...click and dial-the-boost. The profec has like 5-6 settings depending if you set it on high boost or low boost (pretty cool too)

Set which is a percentage value x 100 which means at 0% your boost will be limited by the stock wastegate actuator...as it would with no bc on it. 100% would max the turbo out...not good for a car tuned to 22 psi and a turbo capable ot 30+ So I set high boost @ 50% Which turned out to be 15psi

Set gain which is a sensitivity adjustment for the valve...so anything over a value of ten is for when the boost drops or creeps at high rpm. increase it until it goes away. For when your boost spikes....lower it. Simple as that. 10 seems to work pretty damn well

Start gain (i think it was called this) is when the wastegate actuator is allowed to open up. So if I wanted 15 psi, but only wanted the gate to start venting boost at around 13.5-14psi I just dial it in. pretty cool! this helps with spool up a lot.

Warning level, with this you can set when your boost is too much... IE for us 23psi. If you overboost the gauge turns red(just wait..)

Warning adjustment % when you go over your set value above this percentage is the amount of air the gate can divert to the exhaust if it goes over. So 0 would be just like watching your boost overboost and do nothing. and 100 would dump boost BIG time until it was controlled.

Results and opinion
Took the car out after fiddling with the instructions forever and boost response is MUCH more intense compared to a mbc. Night and day. Boost comes in nice and violent (after the lag). Boost holds STEADY right where you ask it to. In my opinion...EBC>>MBC The price difference is justified to me...by having a nice boost cut in case you over boost, and a ebc that actually limits your boost to exactly what you set it to and it WILL HOLD IT!!!!

I give this

btw..its much more useful compared to the HKS CAMP system that was in the car.

 

nice write-up. Now I want one

 

Good read. thinking of getting one of these as well.

-Aaron

 

good write up, i love my apexi AVCR

 

I'd love one...cost is always a factor.

What other features have you found useful? Does it have gear dependant settings?

 

i always was leaning toward the profec B, but now i am definately getting one!

 

yea i too give it ! i love it, after learning how to use it you can really get the most out of your turbo

 

good info

 

should help\

 

is this the orignal profecb
or the specII?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NyQuiL &raquo;</TD></TR><TR><TD CLASS="quote">is this the orignal profecb
or the specII?</TD></TR></TABLE>

I want to know too. yO!

 

Spec II by the sounds of it. I have one as well and have really liked. Took a while to learn everything but after the learning curve it's a really nice controller.

 

I am assuming this is on the SpecII?

 

not to ressurect old posts, but this should be stickied.

 

Good writw-up. I just got mine and this made more sense than the freaking book. I had to read it twice figure anything out.