Full Blown Turbo Kit Owners Topic - Page 124 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

King Tut · 05-28-2014, 03:16 PM

Quote:

Originally Posted by 69Marshall69

I took apart my BOV and had a brown 13psi spring. I'm connecting the boost gauge side of my wideband failsafe this weekend to find out what I'm running for vacuum. I ordered a 10psi spring(white) and see if it will release properly.

Unless you are running 100% speed density, I think you are going to be disappointed when you install that white spring. I think you guys are worrying too much about what you think is compressor surge and not enough about following the manufacturer of your BOV's advice. The FA20 is more than capable of pulling down over -20 in/hg. With that being said the number can vary depending on where you are pulling that vacuum/boost source from.

sw20kosh · 05-28-2014, 05:41 PM

Quote:

Originally Posted by King Tut

Unless you are running 100% speed density, I think you are going to be disappointed when you install that white spring. I think you guys are worrying too much about what you think is compressor surge and not enough about following the manufacturer of your BOV's advice. The FA20 is more than capable of pulling down over -20 in/hg. With that being said the number can vary depending on where you are pulling that vacuum/boost source from.

I am running a hybrid MAF/SD tune. Uses MAF untill it maxes out the V.

If my BOV is pre-MAF it wouldn't hurt to put in a softer spring right? The BOV may open at idle and during high vac situations but as soon as the vac gets more positive, the BOV spring should shut the BOV and boost can build.

I want to get rid of this horrible flutter I am getting at the GT3076 compressor during low boost lift-offs. Sounds great at high boost lift-offs but no great otherwise.

King Tut · 05-28-2014, 05:46 PM

Quote:

Originally Posted by sw20kosh

I am running a hybrid MAF/SD tune. Uses MAF untill it maxes out the V.

If my BOV is pre-MAF it wouldn't hurt to put in a softer spring right? The BOV may open at idle and during high vac situations but as soon as the vac gets more positive, the BOV spring should shut the BOV and boost can build.

I want to get rid of this horrible flutter I am getting at the GT3076 compressor during low boost lift-offs. Sounds great at high boost lift-offs but no great otherwise.

If the BOV is far enough forward that it's opening/closing in high vacuum situations won't mess with the flow of the air across the MAF sensor, then you should be fine as the MAF will still meter the air properly.

Dipstik-sportech · 05-28-2014, 05:51 PM

I put an 8psi spring in mine and it was open at idle. I had low speed drivability issues and stalling. Put an 10psi one back in and it drives OK but it still flutters

The Frozen North

sw20kosh · 05-28-2014, 06:01 PM

Quote:

Originally Posted by Dipstik-sportech

I put an 8psi spring in mine and it was open at idle. I had low speed drivability issues and stalling. Put an 10psi one back in and it drives OK but it still flutters

The Frozen North

Where is your BOV in relation to the MAF? pre-MAF? post-MAF? 1 foot away from MAF? 2 feet? 3 feet?

Is it the standard Full Blown kit location?

Dipstik-sportech · 05-28-2014, 06:10 PM

Yeah it the standard location pre maf about 8-10"

The Frozen North

sw20kosh · 05-28-2014, 06:20 PM

Quote:

Originally Posted by Dipstik-sportech

Yeah it the standard location pre maf about 8-10"

The Frozen North

That is strange that it would cause driveability problems. I am guessing turbulence from being too close to the MAF?

There is always this for $300: http://www.turbosmartdirect.com/Prod...BOV-BLACK.html

xDBOYx · 05-28-2014, 08:13 PM

add me to the list @King Tut i will try to free time for a build log soon.

Dipstik-sportech · 05-28-2014, 08:15 PM

Quote:

Originally Posted by sw20kosh

That is strange that it would cause driveability problems. I am guessing turbulence from being too close to the MAF?

There is always this for $300: http://www.turbosmartdirect.com/Prod...BOV-BLACK.html

Damn I can't see it coming down to that.

The Frozen North

69Marshall69 · 05-28-2014, 09:13 PM

When I bought my kit, it was a kit already put on another BRZ. It came with the pre-installed brown spring. Even though I am not 100% certain what my vacuum is, it doesn't hurt to try a softer spring. Otherwise I have a useless BOV, it never releases. Not good for the turbo to have back pressure, so its worth a shot changing the spring out.

Infamous Performance · 05-28-2014, 11:16 PM

We have run more than a few cars with no BOV over the years. Compressor surge is over rated IMHO.

What most of you are experiencing is normal. Basically the theory to setting up a BOV is to have it fight the wastegate until the last possible second. Which will cause a slight surge (nothing to worry about) at full boost shifts/off throttle events and will cause a very light "surge" at less than peak boost during shifts/off throttle events. This is normal.

You want a "cough" at WOT and a light/short turkey gobble/quail call at less than WOT.

sw20kosh · 05-28-2014, 11:51 PM

Quote:

Originally Posted by Infamous Performance

We have run more than a few cars with no BOV over the years. Compressor surge is over rated IMHO.

What most of you are experiencing is normal. Basically the theory to setting up a BOV is to have it fight the wastegate until the last possible second. Which will cause a slight surge (nothing to worry about) at full boost shifts/off throttle events and will cause a very light "surge" at less than peak boost during shifts/off throttle events. This is normal.

You want a "cough" at WOT and a light/short turkey gobble/quail call at less than WOT.

I'd rather not have the turkey at all. It's a very unattractive / annoying sound.

If the BOV is being held shut by the boost line to it + spring then I see no other reason why I can't use, say a 10inHG spring other than the valve being open during idle and cruise.

69Marshall69 · 05-29-2014, 10:07 AM

I just want to blow some load bro .

King Tut · 05-29-2014, 11:54 AM

Quote:

Originally Posted by 69Marshall69

When I bought my kit, it was a kit already put on another BRZ. It came with the pre-installed brown spring. Even though I am not 100% certain what my vacuum is, it doesn't hurt to try a softer spring. Otherwise I have a useless BOV, it never releases. Not good for the turbo to have back pressure, so its worth a shot changing the spring out.

If your BOV doesn't open up at all when you shift, then there is something wrong with it.

05-28-2014, 05:51 PM	#1726
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	I put an 8psi spring in mine and it was open at idle. I had low speed drivability issues and stalling. Put an 10psi one back in and it drives OK but it still flutters The Frozen North __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

05-28-2014, 06:10 PM	#1728
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	Yeah it the standard location pre maf about 8-10" The Frozen North __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
AVO Turbo Kit Owners Topic	Sportsguy83	Forced Induction	1935	02-20-2023 11:46 AM
Full Blown FRS/BRZ Stage 1 Turbo Kit	FullBlown	Forced Induction	456	09-27-2021 04:10 AM
FA20Club Turbo Kit Owners Topic	pixel67	Forced Induction	1531	09-09-2014 01:36 PM
Full Blown Turbo Kit!	Unleashed	Engine, Exhaust, Bolt-Ons	70	10-09-2013 10:46 AM
WTB: Full Blown turbo kit (used)	whitefrs	Engine, Exhaust, Bolt-Ons	12	03-29-2013 10:15 PM

05-28-2014, 08:13 PM	#1730
xDBOYx Senior Member Join Date: Dec 2012 Drives: 2013 SWP BRZ Limited Location: Jersey Shore Posts: 596 Thanks: 0 Thanked 144 Times in 120 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	add me to the list @King Tut i will try to free time for a build log soon.

05-28-2014, 11:16 PM	#1733
Infamous Performance Senior Member Join Date: May 2013 Drives: 02 WRX, 05 LGT, 08 LGT, 08 SpecB Location: Escondido, Ca Posts: 4,341 Thanks: 64 Thanked 209 Times in 125 Posts Mentioned: 26 Post(s) Tagged: 0 Thread(s)	We have run more than a few cars with no BOV over the years. Compressor surge is over rated IMHO. What most of you are experiencing is normal. Basically the theory to setting up a BOV is to have it fight the wastegate until the last possible second. Which will cause a slight surge (nothing to worry about) at full boost shifts/off throttle events and will cause a very light "surge" at less than peak boost during shifts/off throttle events. This is normal. You want a "cough" at WOT and a light/short turkey gobble/quail call at less than WOT.

User Name		Remember Me?
Password