i installed a new FP Red BB last week and cant get it to run below 25 psi. the wga is adjusted that it's barely pulling on the flapper. i cleaned out the MBC to make sure it's not stuck. i set it at 17 psi and it creeps up to 25 psi. i set it at 20 psi and it creeps up to 25 psi. i set it for 25 psi and it stays flat. all the pull was done in 4th gear.

mods:
Tial VTA with SD
3" turbo back
Synergy 02 housing
Hallman MBC
FP 18 psi WGA
stock long block

this is the same setup that i used with ATP GTX3076R and was able to run 20 psi without boost creep.
anyone else running FP Red BB that's able to run below 25 psi? just want to make sure i look at every options before i have to take the turbo out to port the waste gate port. i want to be able to run 20 psi at HPDE events.


here's a boost log comparing boost set at 17 psi vs 20 psi.





here' a boost log comparing boost set 20 psi vs. 25 psi.





this is the 02 housing im using.

 

Stock 2.0L?

You might need the turbo ported. Or the flapped could be not opening filling. Did you set preload on the WG?

 

https://www.evolutionm.net/forums/ev...ost-creep.html

Read post #9 from English Racing.

 

That would be a first from what I have seen. The O2 housing is open after the divider?

 

yes, stock long block. barely preload the WGA, just enough so it doesn't rattle.

 

yes, o2 housing is open exactly like the Titek o2 housing.

 

i think most people dont notice the boost creep on the Red because who buys a FP red and run bellow 25 psi

 

yeah, i read that post before i posted mine, but he as a FP Black and i have a Red. i didnt think a Red could be that efficient that the stock turbine housing could cause boost creep below 25 psi.

 

just did some testing on the WGA, used compressed air with regulator to open the WGA.

this is with the regulator set to 25 psi




this is with the regulator set to 30 psi, you can see that it expends the whole way.




you can see that the waste gate flapper moves freely

 

good luck man LOL im the one who posted that other thread LOL, i even bought a new wastegate thinkin that mite b the problem it wasnt, i had my turbosmart wastegate preloaded as low as it could go without rattling, hit 16 psi, then crept the whole way up to 33, so ur not the only one lol

 

honda-guy: AFAIK, there is absolutely no need to remove the entire turbo just to do the porting. The turbine housing can be removed easily w/o any need to first remove the turbo itself. So, you don't really want to remove the turbo. Too much work. Work should be avoided at all costs.

Caveat: I have never worked on a B.B. turbo so perhaps these are different than J.B. turbos with regard to being able to remove the housing w/o a need to remove the turbo from the manifold.

 

Not trying to be a dick, but as far as comparative spoolup is concerned I prefer the looks of the 25 PSI boost log to the 20 PSI boost log. In the 25 PSI log your turbo is hitting 25 PSI by 4000 RPM. This is acceptable spool considering the light preload that you say was applied to the gate. By contrast, the 20 PSI log is doggie spool.

Your 25 PSI log gives us a great example of the sort of spoolup that a B.B. Red is capable of on a stock block, even with a very light level of preload. With my JB Red there is no way that I can see 25 PSI by 4000 RPM with no preload.

 

Historical Note:

In the Old Days, when the FP HD 18 PSI IX actuator was first released, it had a reputation for exhibiting a characteristic boost spike. That is, it would induce, or cause the turbo to do a 3 PSI spike. Most guys would just tune around this. And it was not really a problem for guys running above 22-23 PSI of peak boost.

You see the 18 PSI actuator's boost spike only manifested itself if you were trying to run between 19-21 PSI of peak boost. If you tried adjusting boost to let's say 21 PSI then it would spike to 24 PSI. Now, Robert acknowledged the quirk and like I say most guys tuned around it or learned to live with it. It was public knowledge on these forums back then when the FP IX HD 18 PSI WGA was first released.

Like I said most guys tuned around it back then. However, the California guys with their shotty 91 octane hated that actuator and avoided it like the plague because due to their croppy 91 octane fuel they had to run no more than 20-21 PSI on their pump gas tunes. So, their cars would all be victims of the 18 pounder's inherent spike.

Nowadays no one mentions this spike problem with relation to the FP 18 pounder. Maybe Robert redesigned and cured the issue and so maybe the newer 18 pounders don't exhibit this same problem anymore. I assume that it had to do with the diaphragm one way or another.

Sorry for the OT rant...

 

honda-guy: I am curious as to whether you ran a comparative test using the 25 PSI actuator on your Red to see if the turbo creeps identically with the 25 pounder as it does with the 18 pounder?

 

Loving that spool on the 25psi log... When you gonna let me drive your car, B?





Have you tried swapping out your #18 actuator for your OE unit and see if you still get the creep? That might be what you have to do between DE's and TT's to get the setting you want...