Rx-7$4$me

Hey all, my bud has the profec B spec II and its tweaking out on him. I installed it correctly, im positive of that, and it was working previously.

we had it at like .68 for 10 pis, with like 13-15% gain. perfect quick spool with no spike to 10 psi.

He told me his boost was acting weird so I checked it out. It spikes to about 11 and falls down to 8 and holds at 8 no matter what the settings are on the spec II. I set the boost at 0.00 and it still did it. gain down at 0 too.

I read that there was some surging problems, so I maxed the boost saftey all the way up past 1.00. IT didnt do anything.

The thing is, with the spec II off, it gets the 7 psi, but it spikes a bit over 7 psi first...

so really I have no idea whats going on..

Anyone?

mor

80% Gain.

10 psi: 15% Duty, 95 Start Boost.
12 psi: 25% Duty, 110 Start Boost.

I does get a little wavy at times, not that bad. I have a ported wastegate. Stock pre-spool pill. I don't get spike or creep.

JhnRx7

iTrader: (12)

mine acts up a little too....i cant exactly explain what it does, but its wierd.

for 10psi: duty:36%
gain: 2%
start boost: 95

Rx-7$4$me

WTF what is this duty cycle stuff ? I saw like two adjustments in there. One was Gain, to adjust wastegate speed, the other was gain set, which allowed u to run how much boost u want whihc is .68=10 pounds correct? then there was a red background for the overboost saftey correct? what is this duty cycle?

RotaryExperimental

Heres my 2cents. What the problem almost sounds like is a boost leak somewhere in the system. you say that it wont boost over a certin psi at what ever setting you have the profec at. i would check all of you hoses going from thw turbo to the intake. If you can get your hand on a smoke machine (not the party type the automotive type) to charge the intake track with smoke then see if it leaks out anywhere.

JhnRx7

iTrader: (12)

the duty cycle is what controlls how much boost you want to run. it is the one when you dont need to press anything, all you do is turn the **** and it will adjust.

mor

No, you must turn and push in or the settings won't take. If you turn on accident and don't want the settings, hit menu and it'll revert back to the previous setting.

Duty cycle controls boost level, gain controls sensitivity (higher is better to a certain degree), set gain controls spool up (set as close as possible to set boost level) i.e. if you have duty cycle adjusted to say 15% and that's 10 psi then set the set gain to close to 100 like 95 which is 9.5 (higher is better until you get boost spike).

All of this is in the manual, read through it first.

JhnRx7

iTrader: (12)

that is what i meant, i just did not go into too much detail.

LetsGO7

iTrader: (2)

hey guys...is the Spec II's boost gauge OK to use or go get a boost gauage?!

Thanks

-joe

Alien7

iTrader: (1)

i believe so....with my controller turned off, it reads 7.1 PSI when i go WOT, which I think is what should happen when you're running without pills. So it seems pretty accurate to me...

JhnRx7

iTrader: (12)

It is OK to use as a boost gauge, but it would be alot better if you got an analog type gauge (autometer, defi, ect.) because with the digital display all you see is a bunch of numbers flashing then your peak boost. With an analog type gauge you can tell how fast your turbo is spooling up and a lot of other things that you would not be able to do with a digital display (easily that is). I find myself looking at my Autometer gauge alot more than i look at my Profec B. I normally just look at the Profec B to see what my peak boost was (it flashes after you let off the gas).

JhnRx7

iTrader: (12)

i know this is a little off topic, but since people have been posting what settings they use, can all of you guys who have it post what your settings are?

Alien7

iTrader: (1)

for 10 psi....

37-38% duty cycle
0-2% gain
9.5 Set/start boost

for 8 psi....
24-26% duty cycle

JhnRx7

iTrader: (12)

ya, that is pretty much what my settings are too. mor, why is your gain so high?

Alien7

iTrader: (1)

it's probably because of his ported wastegate?

JhnRx7

iTrader: (12)

i also have a ported wastegate......????


check sig for my mods \/

Rx-7$4$me

god. the SBC-ID is so much less complicated and works 20x better.

mor

My gain is high, but my duty cycle is low which I believe is better response. You want the gain as high as possible without it spiking or waving around.

I'd start with 0% Duty, then keep upping the Gain until you notice the boost start increasing above 7 psi. Keep going up until it starts being unstable. Then adjust Duty until the pressure is at teh level you want.

Alien7

iTrader: (1)

hey that's a pretty interesting way to do it....i'll try it when i get a chance.

Rx-7$4$me - how is the sbc-id better?

vel525

iTrader: (4)

hey, i'm pretty new at this but when you guys are tuning your boost controller i'm assuming you're driving. how are you driving and tuning at the same time? or do you have someone help you. also, the guys who have listed their settings. what do you have your warning level set at? thanks.