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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-26-2018, 03:23 PM   #15
Barefootdan
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I know there’s a few 2017s who went with a supercharger kit that replaced the red manifold. Maybe they can chime in. If not, when I put on my Edelbrock kit, I can snap some photos
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Old 01-28-2018, 02:23 PM   #16
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Garage



http://www.ft86club.com/forums/showp...85&postcount=1
Credit to @Trap63

Last edited by tehShirt; 01-28-2018 at 03:13 PM. Reason: found more pics
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Old 01-28-2018, 02:54 PM   #17
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And the other? Where bolt it on the block?
Edit: member found the pic.
I would like to try some porting/smoothing the inside

Last edited by Teseo; 01-28-2018 at 05:18 PM.
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Old 01-28-2018, 04:47 PM   #18
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it's pretty easy actually...

Quote:
Originally Posted by Lantanafrs2 View Post
I don't know how you would measure a couple of horsepower. Seems that these cars vary a couple of horsepower every dyno pull.
You take several dyno pulls after and before and average the runs. Ideally you would want conditions to be as close to the same i.e. humidity, temperature, etc...
if the average is higher, it's probably netting gains.

Is it proof? no, but it is an indicator.

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Old 01-29-2018, 07:52 AM   #19
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Old 01-29-2018, 12:28 PM   #20
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It's not common practice to polish anymore is it? Port would mean removing the casting marks & in the old days "matching" the ports. but I thought a shiny finish was now considered bad.
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Old 01-29-2018, 12:38 PM   #21
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It's not common practice to polish anymore is it? Port would mean removing the casting marks & in the old days "matching" the ports. but I thought a shiny finish was now considered bad.
Why would that be ....??

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Old 01-29-2018, 04:07 PM   #22
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It's not common practice to polish anymore is it? Port would mean removing the casting marks & in the old days "matching" the ports. but I thought a shiny finish was now considered bad.
At one point in time, it was believed that a rough finish on an wet type intake manifold would promote turbulence and keep fuel droplets suspended in the air stream as they traveled through the manifold. This is actually not entirely true, but it ends up being irrelevant for our cars anyway, since we don't have carburetors or throttle body injection. Rather we have a dry manifold, and no need to worry about keeping gas droplets floating through the runners.

So, the smoother the path for the air to follow, the better. Whether it is a substantial enough improvement to warrant several hundred dollars investment is yet to be seen.
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Old 01-30-2018, 12:57 AM   #23
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Why would that be ....??

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Yea if itís shinny guys will buy it! Or if it has a sexy girl and is shinny we buy 2!
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Old 01-30-2018, 01:00 AM   #24
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Honestly I thought with the tolerances now a days that one would not need to port and polish unless it was a rebuild or high end build. That was my understanding of why it was not done as often as it use to be. Plus we switched from leases to unleaded gas.
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Old 01-30-2018, 01:14 AM   #25
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Honestly I thought with the tolerances now a days that one would not need to port and polish unless it was a rebuild or high end build. That was my understanding of why it was not done as often as it use to be. Plus we switched from leases to unleaded gas.
Ya lost me there, partner .....


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Old 02-01-2018, 03:54 PM   #26
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Pics Inside the 2017 Red Manifold?

In response to my own question, I bought a gasket (just in case, turned out I didnít need it) and pulled the throttle off. Here is what I found:


The plenum behind the throttle body actually looks okay



But then a peak down the runners reveals a rough ride. The surface is like a very rough sandpaper (no surprise there, sandcasting and all),


Hereís a detail/close-up shot of a runner wall.


It seems to my untrained eye that this manifold is a good candidate for a port/hone. Whether Extrude Hone is the way to go or not, Iím not sure. I havenít seen any brush style hones that look flexible or long enough to deal with the length and curvature of these runners.

Either way, hope this information proves useful!


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Old 02-01-2018, 03:56 PM   #27
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Pics Inside the 2017 Red Manifold?

Quote:
Originally Posted by Breadman View Post
its rough really rough. i dont have a pic but ive been under the hood of mine before


Ironically, your tongue-in-cheek answer turned out to be correct after all.


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Old 02-19-2018, 02:16 PM   #28
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Why would that be ....??

humfrz
My understanding is this.

A rough, sandblasted surface, leaves tiny little holes for air to reside. Air slides better on air than a shiny smooth surface.

I know it sounds crazy but on a large scale think of a truck bed. Tailgate down air is flowing over the cab and into the bed. The now horizontal tailgate is now NOT acting as a parachute. Efficient right? Actually no. The tailgate up traps a rolling air bubble in the bed. air coming over the cab simply bounces of this rolling air mass. Makes sense even it is seems less than logical -at first.


IIRC people would match the ports, get rid of casting marks and make the surface as straight and smooth as possible....then rough it up with a sandblaster.
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