FRS / BRZ Intake Manifold - Development Thread - FT-86SpeedFactory by Velox

[Hyper4mance2k]

Originally Posted by Captain Snooze

"D" is for Do it!
"Y" you know you want to
"N" No, don't be shy
"O" is the expression when we see the charts

If I wasn't at work, I'd be posting the 'O' face gif right now.

[johan]

Originally Posted by boredom.is.me

They can machine from a translucent plastic and have the LEDs inside! Delrin/Acetal may be up to the task.



That actually gave me a decent thought. Is there any particular reason for going with whatever material you chose? You could probably knock a little weight off with an appropriate plastic.

If it were plastic, I would not buy it. Half my motivation for getting an aftermarket IM is to get the ugly ass plastic abomination out of my engine bay.

[wparsons]

Originally Posted by boredom.is.me

They can machine from a translucent plastic and have the LEDs inside! Delrin/Acetal may be up to the task.



That actually gave me a decent thought. Is there any particular reason for going with whatever material you chose? You could probably knock a little weight off with an appropriate plastic.

Plastic + lots of boost isn't friendly, regardless of what plastic you use. For N/A you're fine.

[civicdrivr]

Originally Posted by wparsons

Plastic + lots of boost isn't friendly, regardless of what plastic you use. For N/A you're fine.

This. While plastic may not hold the heat the way an aluminum manifold does, I'd rather have the comfort of knowing it can withstand the additional pressure.

Sent from my XT1095

[IBill4You]

Can I buy this yet? Full polished and I'll plastidip it I I decide I want color

[ck-GT86]

Originally Posted by civicdrivr

This. While plastic may not hold the heat the way an aluminum manifold does, I'd rather have the comfort of knowing it can withstand the additional pressure.

Sent from my XT1095

Couldnt the aluminum potentially soak up a lot of heat from the engine though?

. ck

[gramicci101]

I would expect that the velocity of the air inside the manifold pretty much negates any potential for heat soak. The air isn't in contact with the manifold long enough to transfer a significant amount of heat from the metal.

[fika84]

Also, aluminum doesn't "soak" up heat.. it dissipates it effectively, hence why heat sinks are made out of aluminum, to get rid of the heat quickly. Steel would soak it up and hold onto it.

[ck-GT86]

Originally Posted by fika84

Also, aluminum doesn't "soak" up heat.. it dissipates it effectively, hence why heat sinks are made out of aluminum, to get rid of the heat quickly. Steel would soak it up and hold onto it.

Ah, thanks for explanation. Disregard my comment then.

. ck

[churchx]

Problem with metals is that they all are very good heat conductors relative to plastics. Hence if heat soak was issue, i guess that both steel or aluminium won't fix issue much. "Dissipates heat well" can as well work other direction, "absorbs/soaks heat well", depending on temperature gradient. So no, while steel might be a bit worse conductor, it won't be worse in only one direction unless magic is involved. And as due it's strength and weight it most probably will be thinner, that might offset it's worse heat conducting per same material thickness. Most often aluminium is used only because of material price, weight and cheaper tooling to work on. Once rads on cars were mostly made of copper, even better heat conductor (from normal metals 2nd best after silver). It changed to alu in more recent cars mostly because copper spiked in price, not because it weighted more. Price difference of 2-3 times is a lot in eyes of corporate beancounters looking where to make some savings on car that is passed to them by engineers.

[Calum]

Originally Posted by fika84

Also, aluminum doesn't "soak" up heat.. it dissipates it effectively, hence why heat sinks are made out of aluminum, to get rid of the heat quickly. Steel would soak it up and hold onto it.

It would be more accurate to say aluminum conducts heat more efficiently. Which means it would transfer more heat to the incoming air than would steel. Not that anyone wants a boat anchor steel intake manifold. And as was mentioned the heat transfer is likely negligible even with aluminum.

[DocWalt]

Having tuned my GTI with & without a metal intake tube housing my IAT, there's very good reasons to not use metal for an intake... Properly reinforced plastic would likely be prohibitively expensive for this relatively small volume piece though.

[VerusEric]

Originally Posted by DocWalt

Having tuned my GTI with & without a metal intake tube housing my IAT, there's very good reasons to not use metal for an intake... Properly reinforced plastic would likely be prohibitively expensive for this relatively small volume piece though.

You intake temps probably sky rocketed at cruising/idle speeds but at WOT I would be willing to bet they were close to what they were before. I could be very wrong though. Properly designed plastic pieces are extremely expensive like you said. Most of that cost is in tooling though.





These are headed my way to test. Using logs and virtual dyno I should be able to deduct which set is best for NA and go to the dyno with that set. Please be patient as we are all dying to know how it does as well .

[lamawithonel]

Those ridges look intentional. Do they serve a purpose?