So I've got the Greddy Profec B-Spec II and I notice I'm having some weird issues with it. It's not very consistent. Doesn't seem to want to hold boost in 1st and 2nd gears like it does in 3rd and above.

I know you'll never get 30 PSI in 1st gear on a stock 8 turbo, but right now I'm hitting roughly 22 psi max in 1st and almost 30 PSI max in 5th.

Currently I've got my settings as such:

Set: 75
Gain: 17
Start Boost: 0
Warning: 29.5 PSI
Limiter: 0.4%

If I decrease the Gain and Set, the car reacts better in lower gears (1&2) but doesn't respond as well in 3rd - 5th.

If I increase these settings I get more PSI in the higher gears but way less in the lower ones.

Can someone help me figure out what the hell is going on with this thing?

Thanks,

- Steve


INSTRUCTIONS

 

wheres your set gain?

 

Huh, set gain, I'm confused. I've seen this used before, I'm assuming you meant Set, and that's set at 75 right now

 

your set gain is pretty low. Try setting it closer to your spring in the wastegate

 

I've raised my SET up to 85 - 90 in the past, but I was also increasing the GAIN up to 20 and didn't get good results down low. I'll try just the SET GAIN and leave the GAIN to 14 where I had it before... Hopefully that works...

 

OK hold on. after you edit stuff or i read it i realized this. I am talking about the start boost. Leave everything where you had it and put the start boost to like 110-130. Me saying set gain i was referring to start boost

 

Let me make some edits here quick so no one else gets confused...

 

Why not leave start boost at 0 that's where I've had it now for almost a yr. How does this change anything I'm confused

 

Subscribing to get ideas about tuning.

 

Okay here's what I've done:

Using both the LO and HI settings for DD

LO

SET: 100%
GAIN: 0
START BOOST: 0
WARNING: 29.5
LIMITER: 0.4

HI
SET: 80%
GAIN: 15
START BOOST: 0
WARNING: 29.5
LIMITER: 0.4

So the wastegate is completely open for the LO setting. I switch out of this in 3rd gear so I can limit myself to 29 PSI

 

this is not about no tuning ideas, i am having the same problem with this profec b boost controller and been trying to read other post to have it work properly, so stop crapping in people's post and give us a chance to learn what we have to

 

^ this is tuning cumquat! He's looking for ideas on how to configure/tune it. Whats the problem?

 

check this
in the instructions it talks about not having really long lines to the actuator check and see this please

 

lol jeff

 

Long lines will reduce and inhibit performance and consistencies. When I had my profec I had it as close to the solenoid as possible, as close as stock location.

Can we see some logs of a 1,2,3,4 run? I hope we know that the boost will not be the same in the upper gears due to load right?