RomRaider

True but if the op is using the stock map sensor that is 2.5 bar then he is limited by the stock map. I have logged the stock map and found it to be good for up to 37.? psia. At my atmosheric pressure of 14.3 that leaves me with around 22psig. If I am wrong then please correct me. I have a three bar now and all is good with mrp direct.

ok, put the greddy bov on, adjusted max wgdc to 100 and initial to 95 and was able to hit target boost (close enough - high 23's).

it appears that i can sustain target boost longer while in 4th gear (5spd tranny) and BARELY hit 23 in 3rd gear (max wgdc logged of 100).

is this evident of a leak still or a bad bcs (hooked up wrong? does polarity matter?). what else can i check?

my atmospheric pressure is 14.22

On my 02 we have 2 to choose from

manifold relative pressure & manifold relative pressure(corrected)
manifold relative pressure(corrected) is the one that doesn't have the limit.
just wanted to mention this to others

Are you sure your wastegate solenoid is functioning properly. When I was playing around with boost I could hit 23 psi on my vf30 at lower dutys then you are running. You may want to check that your wastegate is closing fully.

wg is closing fully. as for the bcs, how would one test its proper function? does this mean that the bcs is the culprit and not a boost/exhaust leak?

This is incorrect:
1. 'Manifold Relative Pressure' - limited to 18.4 psig regardless
2. 'Manifold Relative Pressure (Corrected)' - limited to about 22.3 psig at sea level (limited to 37 psia - local atmos. pressure)
3. 'Manifold Absolute Pressure' - limited to 37 psia

All ECUs supported by RomRaider (including your 02) also has access to these direct parameters (you have to be connected to the ECU to view extended parameters):
1. 'Manifold Absolute Pressure (Direct)' - no effective limit whatsoever.
2. 'Manifold Relative Pressure (Direct)' - same as direct #1, but with the assumption of sea level atmopsheric pressure (essentially #1 - 14.7 psi)

With the upcoming defs, I'll be adding another Manifold Relative Pressure (Direct) and renaming the old. This new one will be the actual relative pressure with no effective limit (i.e. it would match your boost guage).

I have a question. How are you guys hitting over 22psig on your logs with the stock map sensor? If the stock map maxes 5 volts at 37.? psia then how can it log over that at your sea level of 14.2 atm pressure. I couldnt make my stock map log over that for the life of me logging the direct perams. Is there another manifold pressure sensor that I am not aware of ??? Please throw your wisdom my way as I have become forever lost in a land I thought I knew alot about. Thanks guys!!!!

Because it doesn't. The 37 psia limit is a limitation of the conversion used by the ECU for the logging parameter as explained above. You can log the "direct" parameter and directly log the boost variable used by the ECU with no effective limit, also explained above.

If you look at the pressure sensor scalings in RR, 5 volts would be 41.71 psia (~27 psig at sea level). Now, of course, that doesn't mean the stock sensor will read that high. From what I've seen of others maxing out the stock MAP sensor, it appears to read up to 38 or 39 psia, although I don't know how accurate it is at that point. You just have to make sure you are logging the correct parameter.

Oh!! That cleared that up for me. Thanks merch!! I put in a few hours of logging and trying to figure out the limits of the stock 2.5 bar map. Guess I didnt do enough testing or maybe my map wouldnt read up a pound or two more. To the OP. If you run those boost levels I would def get a three bar map. It wasnt hard to get calibrated correctly.

i will definitely think about moving to a 3bar MAP sensor in the future. for the time being, i want to get back to where i was (70-80% wgdc and able to hit 24psi).

with what i posted in the previous post, can we deduce that the BCS is bad since maxing out the WGDC actually did raise boost by about 1psi? the fact that i can barely hit the "new" higher boost levels in 3rd, does that still indicate a boost/exhaust leak somewhere or would you assume that a bad BCS is the culprit of all my troubles?

thanks again for all the help/info!

You might want to search NASIOC for the stock BOV mod. It works really well. Basically if you look at the bottom of you BOV where it bolts to the IC you will see a hole. Tap that hole to a 1/4-20 and plug it with a plug. Then if you look on the same side as the hole you will see a passage that runs to the top. You will see a casting mark about the size of a 1/4-20. drill that out just enough to open the passage up to free air. This will take the spring presure plus whatever boost you are making and hold the BOV closed until you lift. When you lift you have vac plus boost pushing and pulling and it opens like normal. I have seen a car push 25psi and never had any problems with the BOV leaking or fluttering. I swear by this mod.
Jeff

thanks Turborider,

it's not a problem of the BOV/BPV. i have tried max WGDC with the modded stocker (crushed) and a greddy type-rs (adjustable spring). now i'm looking for answers/suggestions towards answers for the following:





if anyone has any more suggestions i would greatly appreciate them.

I doubt it is the BCS going out. If it really went you'd be stuck at wastegate spring pressure.

Other than that, I think you need a tighter wastegate actuactor. You can usually get alittle more than double wastegate spring pressure with solenoid boost controller, but you're probably already pushing that. I think the standard actuator is ~12 psi or so. Give FP a call and see if you can get a 15-18 psi actuator.

...If you need a larger actuator I have some sitting around..lmk.

would shortening the actuator arm effectively "raise" the spring pressure?

thanks Shad0w! i may just have to go that route.