I have a question that i haven't gotten an answer.
On the profec B
Please tell me what does teh Gain percentage do. Please dont call meeh a nub or stupid question ^^ because i seriously confused. I thought the higher the better but someone told me to set gain to 0 percent. SOme say 30 please tell me waht does the percent do? and what is a safe level. I want to run low 14 psi and high 18 psi. Please help Percentage problem.

i really dont understand the profec and probably neither do most of the profec owners but i say use their suggestion of 30% or 0% since it worked for them it should work for you. if it doesnt they toy with it until it hold the amount of boost you want it to.

The gain is to give the turbo boost, 30 percent SHOULD be 14 psi, that should be set on the low setting, and mess with the gain on high boost to achieve 18psi. The gain is only to get the turbo a little bit of "umph" in the top end.

The gain setting determines how fast the turbo reaches the set psi. Let's say you set your psi at 18. If you set the gain high, it'll reach boost quicker (let's say 4000rpm, this is a made up number).

If you lower the gain, it'll create a "leak" in the vacuum so it takes longer to reach the desired boost.

So many people ask, why not set the gain high so the turbo boosts faster. The thing is, if you set the gain too high, it'll create a boost spike. You have to get a perfect setting for the gain, so that you reach your desired boost within a good amount of time, but yet don't have the boost spike.

Let's pretend your boost is set up at 18psi, and you set the gain real high. It'll get to 18psi quick, but once it gets there there's too much boost already building and you might boost 20+ for a few seconds.

Thanks! that is very helpful i never understood how the boost controller work till today. Thanks

I was told to set mine at 8.

hmmp. im spiking again =(. weird like when i gun it on the freeway. at 4000 rpm i boost spike to 1.5 bar. like my boost woulden't hold the strange thing is that this is teh same exact settings i hadb efore i crash my car and there wasn't any engine damnage just dmg to the intercoolre but it was replaced

This guy just IMed me like last week about this same problem he had with the spiking. He had a loose vacuum line that was causing the problem. You might want to change all the lines. Cracked, missing, unplugged lines will cause spikes or irregular boosts.

will do but right now i cant it's oging to rain all week! WHY!@!@! =)

well i found the problem. one thing was the coils were bad, second i had oil leaking into my spark plugs all 6 of them. 3rd my boost controller was installed incorrectly. everything is fixed now ^_^

I hear the profec b is a pain in the ass is it ?

hmmp i dont think its a pain n-e more. i fixed the other problem and the boost controller is now acting fine.
my friend has a greddy profec A the old school and he likes it better then mine.
also HKS EVC2
but im fine with the greddy profec b

quote:

Originally posted by SupraDsHine:
hmmp i dont think its a pain n-e more. i fixed the other problem and the boost controller is now acting fine.
my friend has a greddy profec A the old school and he likes it better then mine.
also HKS EVC2
but im fine with the greddy profec b

it only took you what 6 months to get it right at least you figured it out.

Profec is prob the best application for low boost applications. It's knob to control boost is simple and reliable to use.