How to size wastegate - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

crazyfrenchbiker · 04-17-2015, 10:27 AM

How do you size your wastegate setup? I'm running a Turbosmart comp gate 40 paired with a GTX3076R and seeing consistent boost creep under WOT.

I am only running spring pressure of 7psi, but by the end of a WOT run, I have creeped to 10psi.

Also I have worked this out in my head, but an EBC wouldn't help with this either right, because once the EBC opens up, we're going to be essentially wide open WG?

Thanks

Basket Case · 04-17-2015, 12:53 PM

I'm pretty sure an EBC should prevent boost creep but I could be completely wrong...

aagun · 04-17-2015, 01:21 PM

Use ur bov to leak extra boost .

Jesse@JDLAutodesign · 04-17-2015, 01:53 PM

Try a smaller spring in the gate.

spitfire481 · 04-17-2015, 02:08 PM

7psi is way low on a gtx3076. Probably going to be hard to get it to not creep at least a little with such low boost. A manual boost controller without a gate ball/spring might work too if you plan on even running a controller. Let's the wastegate start to crack open just before full pressure

crazyfrenchbiker · 04-17-2015, 02:58 PM

I do plan on going to higher boost, so it may be wiser to just install the EBC and run at say 9-10PSI to start?

I would think this should help the WG.

crazyfrenchbiker · 04-17-2015, 02:59 PM

Quote:

Originally Posted by Jesse@JDLAutodesign

Try a smaller spring in the gate.

Like a 5PSI spring and letting it creep to 7 or 8psi?

I would think that the lower the pressure, the more intense the creeping will be.

mrk1 · 04-17-2015, 05:43 PM

The idea of a softer spring is to get the gate to open farther so more gas can by pass the turbine. Softer spring could compress more allowing more flow through.

crazyfrenchbiker · 04-17-2015, 06:06 PM

Quote:

Originally Posted by mrk1

The idea of a softer spring is to get the gate to open farther so more gas can by pass the turbine. Softer spring could compress more allowing more flow through.

That makes sense. Thank you sir.

04-17-2015, 10:27 AM	#1
crazyfrenchbiker Hot Lava 6MT Join Date: Jul 2012 Drives: Hot Lava FR-S Location: Omaha, NE Posts: 398 Thanks: 19 Thanked 78 Times in 60 Posts Mentioned: 12 Post(s) Tagged: 1 Thread(s)	How to size wastegate How do you size your wastegate setup? I'm running a Turbosmart comp gate 40 paired with a GTX3076R and seeing consistent boost creep under WOT. I am only running spring pressure of 7psi, but by the end of a WOT run, I have creeped to 10psi. Also I have worked this out in my head, but an EBC wouldn't help with this either right, because once the EBC opens up, we're going to be essentially wide open WG? Thanks

04-17-2015, 02:08 PM	#5
spitfire481 Senior Member Join Date: Mar 2013 Drives: 2JZ FRS Location: Pure Automotive Performance Posts: 1,378 Thanks: 97 Thanked 1,354 Times in 621 Posts Mentioned: 27 Post(s) Tagged: 2 Thread(s)	7psi is way low on a gtx3076. Probably going to be hard to get it to not creep at least a little with such low boost. A manual boost controller without a gate ball/spring might work too if you plan on even running a controller. Let's the wastegate start to crack open just before full pressure __________________ Pure Automotive Performance MoTeC Build Thread @spitfire481

04-17-2015, 05:43 PM	#8
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 21 Post(s) Tagged: 2 Thread(s)	The idea of a softer spring is to get the gate to open farther so more gas can by pass the turbine. Softer spring could compress more allowing more flow through. __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

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04-17-2015, 12:53 PM	#2
Basket Case Senior Member Join Date: Jun 2013 Drives: 2013 Raven fr-s Location: Southwest Florida Posts: 450 Thanks: 193 Thanked 176 Times in 99 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I'm pretty sure an EBC should prevent boost creep but I could be completely wrong...

04-17-2015, 01:21 PM	#3
aagun Senior Member Join Date: Nov 2012 Drives: 86 Location: uae Posts: 403 Thanks: 202 Thanked 67 Times in 56 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Use ur bov to leak extra boost .

04-17-2015, 01:53 PM	#4
Jesse@JDLAutodesign Join Date: Aug 2012 Drives: 2013 Raven Black FRS Location: Phx AZ Posts: 601 Thanks: 56 Thanked 680 Times in 258 Posts Mentioned: 22 Post(s) Tagged: 3 Thread(s)	Try a smaller spring in the gate.

04-17-2015, 02:58 PM	#6
crazyfrenchbiker Hot Lava 6MT Join Date: Jul 2012 Drives: Hot Lava FR-S Location: Omaha, NE Posts: 398 Thanks: 19 Thanked 78 Times in 60 Posts Mentioned: 12 Post(s) Tagged: 1 Thread(s)	I do plan on going to higher boost, so it may be wiser to just install the EBC and run at say 9-10PSI to start? I would think this should help the WG.

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