cij911

iTrader: (14)

I am setting up my BBK Full and am wondering if I should use a stock WGA, an FP 18psi WGA, or the FP 25psi WGA. I plan on running 91 + meth/H2O or e85. I incorporated a failsafe upon bad AFRs or Knock (ZT2 + Tephra mod).

Which WGA would you recommend and why ?

sparky

iTrader: (1)

What will your boost peak be cij?

EvoPower81

iTrader: (14)

Waste gate choice depends on how much boost you think you can run safely on that 91 so that if you fail safe has to take over your engine will be survive. I figure you will want to run the highest pressure waste gate your tune will be safe at. IMO

cij911

iTrader: (14)

So with just straight 91, I believe folks can get goods results with the BBK ~24psi tapering to redline ~18/19 psi. With 91 + Meth/H20 or e85 I think I will run more like 28psi peak tapering to ~23 psi (or as much as I can hold).

So I guess if I am running just straight 91, there will really never be enough boost to open a 25 psi WGA (so not a good choice). For the higher boost fuels though I am still not planning on running a ton of boost, so I don't know if it is better to just stick with the 18 psi or even stock. I own a stock WGA and 18psi WGA. Right now I have the 18psi WGA installed....

Thanks!

sparky

iTrader: (1)

For 28# the FP 18# actuator is the ticket, IMO. For 28# peak I'd rather run the 18# WGA preloaded to 25# spring pressure, than the 25# WGA with no preload.

Mikey, aka BLKCarbonEVO, runs the 18# actuator and reaches a 32 PSI peak boost level. If you'll recall, before the 25# actuator was available, Meth users() proved that the 18# unit was up to the task by preloading it to 27-28 PSI when running 32-34 PSI peak.

So, try the 18# unit, especially since you already have one. For initial WGA setup, install the actuator rod onto the flapper valve's pivot arm to where the hole on the end of the actuator rod just slides onto the peg and then give it 4-to-5 full 360* rotations. You can do this on the bench before installing the turbo onto the car. This should get you in the ballpark somewhere around 21-23# of spring pressure.

The above is supposing that you'll never be running less that 21-23#. If, however, you will be switching to a straight pumpgas map, then it would depend on what your peak boost will be on straight pump gas. As you'd need to set spring pressure at just about 2-3# under what your lowest target boost would be depending on which map you'll be running. Even so, I think that the 18# WGA will do the job for you.

cij911

iTrader: (14)

Thanks Sparky !

Evo_Jay

iTrader: (17)

I think your boost numbers on 91 are a lil conservative. I have a RED on 91oct and I run 26-27lbs tapering to 23-24.

I know bryan@GST setups a lot of his BBK for 24-25lbs thoughout the whole RPM range. No taper (ECU boost)


I dont know if i agree with your 18# WGA recommendation. I have the 18# WGA right now, running 26-27lbs and Ill be gettin the 25#wga soon.

Also, I like you say, I think you should have a WGA that is 2-3# below your lowest target boost. If he wants 28lbs of boost, the 25lbs WGA is the ticket.

sparky

iTrader: (1)

We don't have to agree. I guess that it depends on how much you like preloading the actuator. I just thought that cij should try the 18# unit since he already has one before purchasing something that he may, or may not need. Probably, I do agree with you up to a point. It is easier to setup the 25# unit with no preloading, to work with a 28# peak, although I think that the 18# should work perfectly well, probably better, at controlling a 28# peak.

There is something else that you might want to take into consideration if you're going to be running a relatively low peak, like 27-28# for the 25# unit and that something makes me prefer the 18# actuator at that particular boost level. With a 28 PSI peak you might be able to set the turbo to spoolup better with the 18# unit. Why? The 25# unit is fully open at 25# supposedly, right? But actually with no preload the valve begins to crack off its seat and then lift at a much lower PSI.

If you are going to be running a peak that is just 2# above the rating of the actuator, then you'll have to set it up with little or no spring preload. Set that way, at its loosest setting, the flapper will be cracking and lifting early. You'll have doggier spoolup than you would with the 18# WGA preloaded to 25 PSI.

With the 18# actuator on the other hand the flapper valve will tend to stay on the seat better at low boost pressure during spoolup because you can preload the spring more. Whereas the 25# may have a maximum rate of 25# but it will lift earlier with zero preload than the 18# will with 5 full turns.

fromWRXtoEVO

iTrader: (18)

I have a 25 WGA from Forcedperformance. We tested in the shop with a precission air gauge before installing it and it held the pressure perfectly as advertized. As per the driving, the spool up is better and off course the power/boost up top is stronger.

There is a post from a member that gained mega power with this WGA and crusing the BOV. By the way, if you are getting the BBK go with the 25 PSI one.

Carlos

cij911

iTrader: (14)

Thanks guys! The only concern I have with the 25 psi WGA is that it gives me little to no room for my meth failsafe (when a condition is met the boost pressure is diverted to the WGA via a solenoid). I'll try the 18psi WGA and see how it goes...

Thanks!

sparky

iTrader: (1)

I think that most guys with the BBK are running either the stock WGA, or the Forge WGA as in the case of many of the California BBK owners. The NorCal BBK users do not even use the FP actuators at all and go with the Forge units almost exclusively. Of course, I heard that a few of those NorCal guys grew up driving SaabsLol.

dastallion951

well to add my $0.02 im runnin a built engine with fp red on 91 octane cali gas n im runnin with stock 9 waste gate with dejon tool mbc and im gettin 27psi peak around 4100rpms and tapers to about 23.xx by 8000rpms....so go with the 18psi im lookin to buy that in addition to milspec ported intake mani and tb.....good luck and report back

sparky

iTrader: (1)

Yeah, I have the FP 18# piece now mounted on my old-style Green. I have tried it up to 27# on 93 octane and it does the job perfectly well. Currently, I have it set so that it is on spring pressure up to about 19# and my Dejon MBC controls the peak to 22.5(91 octane tune). As I said, this setup is working just fine with my Green at those two boost levels.

Soon, I'll be retiring the Green in favor of a Red which I plan to peak at 26-28# on 91. For the 26-28# peak I'll just preload the actuator up to about 24#. I am confident that there will be no need to go out and purchase a 25# actuator from FP.

boostedwrx

iTrader: (27)

I'm still on stock actuator, 29psi. With the tru-boost off I see like 14psi wastegate pressure.