Tial Q versus Tial QR

[BlunicornXT]

Hello,

Noob here. I have an EJ 2.55 Subaru motor I’m building up and want to add a BOV. Can anyone tell me what the difference would be between the Tial Q and Tial QR for open source tuning?

Any info would help.

 

[Canadian_CD9A]

Q is dump to atmosphere, QR is recirculated. If you're untuned, you buy the one that matches the factory characteristic to maintain proper AFR through shifts. If you're doing a full tune, it shouldn't matter which you choose. Stock tunes deliver fuel for the bypassed air remaining in the system - it's already been measured as going through the intake tract, and the fuel requirements are thusly. When you release the air to atmosphere and dump the fuel into the engine anyway, it stutters a bit from running too rich. So your vent-to-atmosphere BOV tune needs to add less fuel, to compensate for the measured air being released, and new air being taken in. I prefer recirculated for the stealth factor and it might quicken turbo recovery just a smidge.

 

[BlunicornXT]

Heck yes. Great response, thank you. The car will be undergoing a full tune.

 

[pauleyman]

Hello,

Noob here. I have an EJ 2.55 Subaru motor I’m building up and want to add a BOV. Can anyone tell me what the difference would be between the Tial Q and Tial QR for open source tuning?

Any info would help.

You are on a Mitsubishi only site. All are welcome but we will not be able to address subaru specific questions.

 

[curt-s]

Indeed. For examples of none of us actually knowing much about Subarus, here is recent proof https://www.dsmtuners.com/threads/subaru-5-speed-issues.542771/
And some of us wear that badge with pride

Im somehow not 100% convinced on the common recirculation notions. This doesn't account for all driving scenarios but let's take WOT for example. When you're shifting, you are usually off the gas, cutting the injectors and the system isn't calculating new duty cycles. The air that left the UICP needs to travel back to the cylinders, but is blocked by the throttle plate (except for whatever slips past IAC and such) unless you're back on the throttle. Once you're back on the throttle the system is reading new numbers from the MAF anyway. If anything, the excess air of a greater pressure than pre turbo is either going to backflow out the MAF or be in excess of any new numbers the MAF starts sending, causing a temporary lean condition when it reaches the cylinders.
Unless the ECU is calculating based off what it thinks is still in the system and tapering off over time to "return to normal".

Now, in light throttle scenarios where the system does not cut injectors but there's enough of a pressure difference to dump, you'll always end up in a rich condition because all that air that was there ready to go is now 6ft away and having to make its journey back.
Eventually it will get there but not instantly.

Good questions for twdorris..

Also, not convinced the pressurized, turbulent air blasted into the intake pipe would help the compressor spin any better.

I might be missing something in both of these, as they're just toilet ramblings..

 

[BlunicornXT]

You are on a Mitsubishi only site. All are welcome but we will not be able to address subaru specific questions.

Thanks, it was more a general question about the BOV differences. I don’t know many in the Subaru community that use Tial. When I was googling the differences of the q and qr there was a thread here correlating to my question.

Got a great response already. Cheers!

 

[pauleyman]

Thanks, it was more a general question about the BOV differences. I don’t know many in the Subaru community that use Tial. When I was googling the differences of the q and qr there was a thread here correlating to my question.

Got a great response already. Cheers!

Everybody is welcome. Glad you got some info.