Aftermarket Intake Mani. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

usptwins · 10-08-2012, 11:13 PM

So, im starting to wonder how much boost this lil plastic manifold can hold.... I sure hope someone is developing an aftermarket one out of aluminum... This would be great. Please, someone, tell me that this is being done.

xwd · 10-08-2012, 11:46 PM

Quote:

Originally Posted by usptwins

So, im starting to wonder how much boost this lil plastic manifold can hold.... I sure hope someone is developing an aftermarket one out of aluminum... This would be great. Please, someone, tell me that this is being done.

The plastic manifolds on the WRX can handle 30+ PSI. Generally they are better in every way than the old aluminum ones. I don't think that will be an issue.

Mitch · 10-08-2012, 11:47 PM

I've seen north of 20psi on 15 year old BMW plastic manifolds.

usptwins · 10-09-2012, 12:04 AM

Yall really think so? Im just so use to aluminum mani's that they seem sceptical... But, do they really flow that much better?

dabocx · 10-09-2012, 12:06 AM

I doubt the material used would affect flow much if at all, its more a matter of the way the manifold is designed that affects flow.

Still im sure we will see aftermarket ones soon.

gmookher · 10-09-2012, 12:38 AM

plastic has less heat soak

Guff · 10-09-2012, 12:41 AM

Plastic is smoother than cast aluminum and has less heatsoak.

Arguably, it is not as shiny. But that can be overlooked for the sake of performance.

Coheed · 10-09-2012, 02:28 AM

Is it really plastic? I thought it was a composite fiber material. FRM?

At any rate, it is much more rigid and won't melt until very high temperatures.

usptwins · 10-09-2012, 05:51 AM

Well, whatever it really is. I was just wondering.

Turbowned · 10-09-2012, 12:45 PM

Well, it's not a Ford plastic manifold, so I think we're safe

Though I would be interested to see if Cosworth designs a manifold for the FA20 like the one they make for the EJ257:

chutrain · 10-09-2012, 01:41 PM

I was running around 20psi on my LGT manifold and never had an issue. The stock top mount would fail way before. Never heard of any issues with the plastic manifold to be honest. They are not prone to heatsoak like the aluminum ones that are found on the STI.

jeebus · 10-09-2012, 01:59 PM

I'm actually wondering if someone will make an intake manifold that manages to cure the power dip.

Chewie4299 · 10-09-2012, 10:06 PM

Think about the pressures that a 2 liter soda bottle can take. I don't know any figures offhand but a quick Google search is giving me 70+ psi....

Don't assume that just because it's not metal that it is weak...

Sent from my Galaxy Nexus using Tapatalk 2

seven · 10-10-2012, 03:21 AM

Plastic manifolds are fine, plenty of LSx guys make 700+ with an LS6 style plastic one, or even more with a FAST 90/92/102mm intake manifold - had a 102mm on my corvette.

10-08-2012, 11:13 PM	#1
usptwins Toyota Soul Join Date: Aug 2012 Drives: 96 taco Location: Louisiana Posts: 528 Thanks: 725 Thanked 99 Times in 78 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Aftermarket Intake Mani. So, im starting to wonder how much boost this lil plastic manifold can hold.... I sure hope someone is developing an aftermarket one out of aluminum... This would be great. Please, someone, tell me that this is being done. __________________ No replacement for Displacement??? Tell that to the people with a 2JZ.

10-09-2012, 12:04 AM	#4
usptwins Toyota Soul Join Date: Aug 2012 Drives: 96 taco Location: Louisiana Posts: 528 Thanks: 725 Thanked 99 Times in 78 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Yall really think so? Im just so use to aluminum mani's that they seem sceptical... But, do they really flow that much better? __________________ No replacement for Displacement??? Tell that to the people with a 2JZ.

10-09-2012, 05:51 AM	#9
usptwins Toyota Soul Join Date: Aug 2012 Drives: 96 taco Location: Louisiana Posts: 528 Thanks: 725 Thanked 99 Times in 78 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Well, whatever it really is. I was just wondering. __________________ No replacement for Displacement??? Tell that to the people with a 2JZ.

10-09-2012, 01:59 PM	#12
jeebus Senior Member Join Date: Jul 2012 Drives: 2015 Mustang GT (on order) Location: San Diego Posts: 904 Thanks: 114 Thanked 471 Times in 208 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	I'm actually wondering if someone will make an intake manifold that manages to cure the power dip. __________________

10-09-2012, 10:06 PM	#13
Chewie4299 Spaceman Join Date: Jun 2012 Drives: 2013 Firestorm Scion FR-S Location: Wallingford, CT Posts: 1,581 Thanks: 854 Thanked 860 Times in 468 Posts Mentioned: 26 Post(s) Tagged: 0 Thread(s)	Think about the pressures that a 2 liter soda bottle can take. I don't know any figures offhand but a quick Google search is giving me 70+ psi.... Don't assume that just because it's not metal that it is weak... Sent from my Galaxy Nexus using Tapatalk 2 __________________ 2013 Firestorm Scion FR-S - Car Journal

10-08-2012, 11:47 PM	#3
Mitch form follows function Join Date: Nov 2011 Drives: RIP '13 BRZ Location: Baton Rouge Posts: 688 Thanks: 42 Thanked 234 Times in 122 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	I've seen north of 20psi on 15 year old BMW plastic manifolds.

10-09-2012, 12:06 AM	#5
dabocx Senior Member Join Date: Jan 2012 Drives: Scion FRS Location: United States Posts: 1,267 Thanks: 564 Thanked 261 Times in 191 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	I doubt the material used would affect flow much if at all, its more a matter of the way the manifold is designed that affects flow. Still im sure we will see aftermarket ones soon.

10-09-2012, 12:38 AM	#6
gmookher Banned Join Date: Aug 2012 Drives: VortechSC,BorlaEL,Perrin,GCRace Location: HighHeatHighAltitudeAZ,USA Posts: 2,254 Thanks: 458 Thanked 669 Times in 394 Posts Mentioned: 9 Post(s) Tagged: 2 Thread(s)	plastic has less heat soak

10-09-2012, 02:28 AM	#8
Coheed Senior Member Join Date: Jun 2012 Drives: DGM BRZ Limited Location: Seattle Posts: 813 Thanks: 209 Thanked 225 Times in 157 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Is it really plastic? I thought it was a composite fiber material. FRM? At any rate, it is much more rigid and won't melt until very high temperatures.

10-10-2012, 03:21 AM	#14
seven Tells it like it is Join Date: Aug 2012 Drives: SS1LE \| F150 Diesel \| Civic \| S3 Location: Charlotte NC Posts: 823 Thanks: 62 Thanked 279 Times in 122 Posts Mentioned: 11 Post(s) Tagged: 1 Thread(s)	Plastic manifolds are fine, plenty of LSx guys make 700+ with an LS6 style plastic one, or even more with a FAST 90/92/102mm intake manifold - had a 102mm on my corvette.

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