High psi Boost Controller choice

[zilo900]

I currently have a greddy profec 2 and it has worked great for me. The car has run up to ~27 psi on an evo3 16g. I will be going with a bigger turbo and setup for the coming year and will be looking to run over 30psi. Aside from needing a boost gauge that reads past 30psi, I was wondering if above about 30psi I should consider a different boost controller.

My current ideas are:
keep my profec 2
get a MBC
get hks evc 5 (supposed to be good up to 36 psi)

I love the profec 2 because of the ease of an EBC and the easy switch for hi/lo boost so i can go between my pump/race gas settings. I know the mbc would be reliable for whatever psi i need, but is it possible my profec can handle boost in the 30-35 psi range?

Im lookin for which would be best, please keep it between just these three choices, I know there are many other ebc's and such. Also experience would be helpful. I dont know what the limit is for the profec, but please dont tell me your guess of it. and as far as the hks being hard to work with, that is no problem either, settings for the profec were hard at first but all the settings make it easy once you understand everything.

 

[DSMunknown]

Have you considered Turbosmart as an option?

 

[hereitcomes]

Ive heard about the turbosmart BC, have you given the Turbo XS dual stage one a look?

 

[CanadianTSi]

The Profec Spec 2 is good for up to 42psi If I remember correctly...

 

[zilo900]

awesome, I might go with that turbosmart one just to get some extra money by sellin my profec.

 

[topstreet]

The profec will do what you need it to. If you are looking to got to a MBC... The TurboSmart manual has been doing very well for me. Accuate boost control from 26psi (spring pressure) to 45psi.

Good Luck!

Jake

 

[DSMunknown]

Congratulations Jake for being designated as a five-star general.

 

[daren_p]

Your profec II should be fine as they can go up to ~42 psi. The only factor that limits this amount of boost is your base wastegate pressure. The profec works on a multiplication factor of your base wastegate pressure, not sure the exact multiplication factor but I believe its around 2.5x's. So for example if you WG spring was 10 psi you could run up to 25 psi, now if your base wg spring was 15 psi you could run up to 37.5 psi, etc.

 

[DSMunknown]

Your profec II should be fine as they can go up to ~42 psi. The only factor that limits this amount of boost is your base wastegate pressure. The profec works on a multiplication factor of your base wastegate pressure, not sure the exact multiplication factor but I believe its around 2.5x's. So for example if you WG spring was 10 psi you could run up to 25 psi, now if your base wg spring was 15 psi you could run up to 37.5 psi, etc.

Daren, where would one locate this multiplication factor for other boost controllers? That is, how would one find this number and have it be accurate? Would one have to have special equipment to test the spring's tension/resistance?

And is the WG spring different from the BC spring, or are they one-in-the-same? If they are in fact different, then where could one find out what the multiplication factor of the WG spring be? Perhaps such information is included when one buys a new turbo? Additionally, if one had a OEM turbocharger with an OEM WG spring, then were would one be able to find out that information?

Also, can this WG spring number fluctuate/change (from wear and use)?

 

[zilo900]

Well I'll be runing an external wastegate. Tial 38mm. I should be good then I guess

 

[daren_p]

Ya if you have external you shouldn't have any issues, Id want to run probably the 15 psi spring or larger if you don't plan on needing to run low boost.

DSMunknown not sure I understand what all your asking but I'll do my best. This multiplication factor that Im talking about is only for electronic boost controllers & if they don't tell you what the factor is in the manuel the only way to find out would be to run yor wastegate with a known boost pressure spring (ie just run the wg directly to a pressure source if you don't happen to know what the boost pressure is) & see what the max amount of boost is that you can see. I though I read somewhere in one of the greddy manuels that they use a multiplication factor of 2.5 times what your base wastegate (or boost) pressure is. Then it was someone at SBR I believe that said it wasn't that high & is more like 2 times but I don't think this is true as my wastegate will see about 13psi connected directly & I can run 20-22 with it set to mid to slighlty over, indicating that the factor is infact more then 2 times.

I think you may be abit confussed you don't need to physically know the spring tension of the WG actuator you just need to know what boost level it holds. For example the stock t25 actuator will run around 10 psi connected directly to a pressure source (ie with the BCS disconnected) so if you ran an EBC such as the greddy you would be able to turn the boost up approx to 25psi max (2.5 times your base WG boost pressure)