Greddy Profec B Spec 2 settings

[GTSMR2TURBO]

Does any one out there have one of these in their MR2 ?

Reason being is that I have just bought one and Im trying to set it up with limited success, I was hoping some one would be willing to share their settings...

I'm aiming for around 14 psi but anything will be better than what I have managed to achieve at the moment...

[Dell'Orto]

PM Al, I'm pretty sure he had one in his MR2. I think flygt4 uses one in his AE101 as well.

[Boosted_162]

Just looked at mine, and could only find two figures. First one is on 45%, which is set by turning the right knob on main screen. Other is gain, which is set on 20%.

These give me about 1 bar (14.7psi) on a gen 2 3SGTE, ST185.

I know the gain controls wastegate response, meaning you can change spoolability (yeah i made the word up ). I think it just makes the wastegate stay fully shut till it gets to full boost (someone may correct me if im proven wrong).

I just read in the manual that the first figure isnt meant to be a actual boost level, "the feature controls the duty rate of the valve unit which controls boost". So if your having problems tuning it, i'd suggest setting this low and slowly working upwards till you get required boost. 0% on this setting means stock boost, while 100% is maximum flow in turbo/wastegate.

[flygt4]

gain - you want it as high as possible without it overboosting, this will give you quickest possible spoolup.
figure out how to use the peak boost feature each time you test it and then reset after every test as this will pick up boost spikes and tell you if you have the gain set too high.

% - the % duty cycle of the solenoid, ie how much it is open, directly affecting how much boost you run.

example on my car , probly different as it depends on wastegate spring , turbo size etc.
25% gain , 45% is approx 14psi
30% gain 65% is about 20psi


i suggest you start low and work up, using 4th gear on the motorway. ie 10%gain/20% , read the peak boost, reset peak boost, 10%gain/25% , then once you have the desired peak boost setting slowly adjust the gain up until you are happy with it.

search google for profec b spec 2 manual, there is definately one on the net in pdf format as ive downloaded it myself.

[Boosted_162]

Ive got a manual here if you want me to look up anything.

[matt dunn]

So they are still only a duty cycle and gain type, like the gizzmo IBC.
They dont have any closed loop control?

[Adydas]

Dont they all work the same using the duty cycle system? even my boost controllers the same for my Motec ecu.

[flygt4]

the only settings mine uses to set it are duty cycle and gain.

by closed loop control you mean it gets feedback and adjusts the settings as it goes? rather than just blindly setting a % duty cycle and thats it

not to sure on the details but the profec does seem to adjust itself as the pressure changes and will hold a pretty stready boost curve through the rpm. i dont think its quite as basic as setting it up would let you think.
that said i dont really know much about the actual operation of it other than adjusting the settings from the controller.



you can see on that curve thats its compensating right through to try and hold it at a set pressure.

[GTSMR2TURBO]

what I'm getting is it will smoothly boost up to around 14 psi but then it drops off to around 6 psi and holds at 6 psi, no matter what I seem to do it keeps doing this...

[flygt4]

what are the settings at?

[Boosted_162]

what I'm getting is it will smoothly boost up to around 14 psi but then it drops off to around 6 psi and holds at 6 psi, no matter what I seem to do it keeps doing this...

That almost sounds like the VSV pulling the boost back?

[flygt4]

could be, only time i ever saw 6 psi on my old gt4 was when the vsv was keeping the boost down. was 9-12 psi all the time with vsv disabled.
no point really using an EBC if the vsv hasnt been disabled.

i guess its also possible that the settings are incorrect, and the actual boost setting is 6psi, and the gain is too high causing it to spike to 14 then taper back.

[Boosted_162]

Nah, i know at least with the CT26 it cant spike that much. Tried it tonight, max gain (35%) and minimum boost setting (0%) and it didnt spike at all. Just runs 7psi, but spools pretty quick.

[flygt4]

just make sure all the plumbing is 100% correct and keep playing with it til you get the result you're after. the profec are pretty user friendly as far as ebc's go.

[dotdog]

the vsv is definately not it, as it's long gone

[GTSMR2TURBO]

The vsv is disconnected and blocked off on the actuator side, so it shouldn't have any part to play.

settings

Set: 50%
Gain: 15%
Set gain: 10.0 psi

it doesnt seem to matter how I adjust these settings it always seems to fall back to 6psi

[flygt4]

in my manual it says -
- if the boost falls off at higher rpm increase the gain adjustment 2 increments at a time until it stabilizes.

when boost spikes occur, low the gain 2 increments at a time unitl it stabilizes.

[dotdog]

When I was in it, it was spiking to bout 9spi, then backing off to 6psi then picking back up to 8.5psi, and doing that isnt really covered in the manual