I just installed the Greddy Profec B Spec 2 in my EVO. Everything is working fine with it. I am wondering what settings people are using for the gain, and start boost setting. I am just curious what other people are getting for these values. I am up to 30 on gain and start boost is at 14.5 psi. It seems to go to the 16 psi pretty quickly. I am just wondering if I can get better spool up by going higher on these two values. What are you other people using for these values. I did a search and couldn't find anything on this topic.

Thanks,
Brian

 

Is the product simple to use? i was thinking of buying it, but i'm not to sure if simplicity is necessarily better?

 

It is real simple to use. I just read the instructions and figured it out within about 10 minutes after it was installed. I am using about 37% boost setting to get to 16 psi. It also has a gain and a start boost setting. These settings need to be figured out to keep the boost from over shooting and/or boost fall off in the upper RPM range. I am just wondering what other people have found to be good numbers for these settings.

Brian

 

So what exaclty does your boost curve look like at each RPM point? I try to run 19PSI/1.32 Bar with a MBC but it tapers to 17PSI/>1.2Bar at red line. I was thinking of getting an EBC to hold the boost better, the EVO should be able to hold 19PSI to redline.
If your getting that and you floor it at 3-4K in 4th/5th gear and it does not spike to badly then I would say you have it set properly.
I have used the old profec B and it was an excellent system, I was wondering about the new spec 2 system? Any one have experience with both?
With my old system I set the gain to get the fastest response/spool, and then turned it down just enough so that it would not spike in high gear at low RPM. I am not sure about what adjustments are available with the spec 2, but the basic boost control philosophy should be the same.

 

It seems that I am going straight to my boost setting and staying there +or- .3 psi as shown on the digital gauge. I was wanting to try to turn the gain up higher to see if I can make the boost go up by turning it too high. Then I will turn it down to control the boost better. The start boost setting is a new setting that the old Profec didn't have. I lets you set the boost level that the boost controller will open the signal to the wastegate actuator. The closer you set it to the max boost setting the faster the spool will be. In other words it will hold the wastegate flapper closed unitl the start boost pressure is achieved and then it will open the wastegate fully to try to control the boost. Make sense?

Brian

 

Can you actually get more boost though?

 

It takes about 39% duty cycle to get to 16 psi and 47% duty cycle to get to 19 psi. This is with a stock exhaust and stock intake. This means that it could easily go plenty higher. The Profec B Spec 2 is a nice piece. Plus it can double as a boost controller if you install it on the steering column like I did.

Brian

 

You mean double as a boost gauge? I thought this was an electronic boost controller??? Lol im confused now.

 

The Profec B Spec 2 has a built in digital boost gauge with peak and hold boost reading. Therefore you can use it as a boost gauge if you mount it where it is easily visible. It is a boost controller that happens to display boost pressure. You can kill two birds with one stone with it. Still confused?

Brian

 

Ehh.... most boost conroller display those readings. Does seem to be one of the better buys tho. I'm really leaning towards the Profec B spec II....Just have to wait and see. Are you going to attempt higher boosts then stock 19psi?

 

Eventually will go higher than 19 psi, but not on 93 octane. The profec B spec 2 is a good deal for the money.

Brian

 

Don't most say they can go up with 93 octane?

 

You probably can go higher on 93, but not on stock exhaust and stock intake. It seems to be pulling timing when running that high. I tried it at 19 psi and it didn't pull smooth on the top end. I think with better flowing exhaust and intake it would probably do better at the higher boost settings. Or I could have gotten some bad gas.

Brian

 

when i was trying to set mine up it spiked up to like 1.82 bar and shut off my turbo under full throttle in 5th...i thought i broke something till i stepped on it again and it still spooled.

 

How did it spike up that high? What were your settings to make it go that high?

I have found with mine that the gain should be kept between 10 and 15 for best results. It you set the gain too high the boost goes up and down at WOT. I also have found the start boost need to be about 4 psi less than your maximum obtained boost pressure, this will make for quick spool up and minimum boost spike. I am having very good results so far with mine.

Brian