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

[HUNTERANGEL121]

Originally Posted by fika84

It's more of a wish list at the moment.. I have a 4 month old daughter too, so the car kind of got the back burner.. but I am building it in pieces. The plan is to get another engine and do head work. I live close to the guys at SCR performance and my wife is good friends with the owner. Check out this build if you haven't (LINK). They went with boosted setup. But with some head work, oversize valves, better valve springs, @NotEric6 's intake manifold and a full exhaust we should make some power up to 9k!! I would also do a 4.56 final drive and have some fun!!!

Lol. Looks amazing. How's the rod ratio and piston speed in the FA20?

Sent from my toaster

[Tim Radley]

Originally Posted by NotEric6

1.25" height and seeing peak load somewhere around 7500. But for the most part its flat all the way to 8k RPM. Not sure what this translates to hp/tq wise but it feels great up there.

Maybe you are out of cam then or something else is holding it back. Exhaust and exhaust manifold type?

[Tim Radley]

Originally Posted by fika84

But with some head work, oversize valves, better valve springs

Why oversize valves? These are massive already.
Springs yes, stock ones are very weak.

[fika84]

Originally Posted by HUNTERANGEL121

Lol. Looks amazing. How's the rod ratio and piston speed in the FA20?

Sent from my toaster

Doesn't seem to be much of a concern. They briefly touch on it when they're building the bottom end in THIS section of their build.

I also wouldn't be hardcore tracking my car. It would be a weekend warrior, daily driver so I wouldn't have the fears of oil starvation under long radius high lateral G corners like element tuning. They've done really good at breaking this platform and improving on it. (LINK).

I just want a bit over 200whp and 9k rpm redline. I think it would be a BLAST in this car!!

[fika84]

Originally Posted by Tim Radley

Why oversize valves? These are massive already.
Springs yes, stock ones are very weak.

I figured if I was doing head work and want to maximize flow for high revving it might be worth changing.. but I may not. SCR Performance got 30% more flow out of just opening up the exhaust ports and 10% more on the intake side.

You're probably right though, it's probably over kill.

[celek]

Originally Posted by 2much

wtf! you cant say shit like that and leave us hanging!

Here is mine. http://www.ft86club.com/forums/showthread.php?t=63901
2.3 ltr 13:1 CR built for 9k RPM

SLOW build

[cdrazic93]

Originally Posted by fika84

I figured if I was doing head work and want to maximize flow for high revving it might be worth changing.. but I may not. SCR Performance got 30% more flow out of just opening up the exhaust ports and 10% more on the intake side.

You're probably right though, it's probably over kill.

I read their teardown article a while back, i noticed the valves didnt leave much room for imagination in there. Hard to see fitting even a +1 in there. The exhaust port will be the most benefitial machining they did in their headwork.

[fika84]

Originally Posted by cdrazic93

I read their teardown article a while back, i noticed the valves didnt leave much room for imagination in there. Hard to see fitting even a +1 in there. The exhaust port will be the most benefitial machining they did in their headwork.

Yeah, the exhaust ports are the big ones for sure. There are companies making +1mm valves for this motor.. but probably really only beneficial for high boost applications.

[johan]

Originally Posted by nelsmar

The integra GSR actually had two intake manifold runners, one that would open up for higher volume. But yup! It has been done many times!

As for it being different than ITB's to the engine it is all the same... vacuum is vacuum. If the manifold is 2BAR or 1BAR (Atmospheric) the engine is still in a vacuum in comparison. The only difference is you are WOT with a bellhorn in the manifold and then you are simply regulating the pressure vs regulating the flow. The throttle can restrict flow vs having a massive plenum. However there are size constraints due to factory AC lines and other bits and pieces to be able to make a fully unrestricted manifold.

Velox is simply putting the runner inside the plenum instead of adding the plenum on top of the runner... Think of the BMW manifolds... they are ITB's with stacks inside of a plenum.

Im no specialists in this art / science but I have been around the scene for a while and I have seen many intake manifolds with this design in the Honda community in the past for the B & K series.

Others have done this such as AMS, Full Blown, Skunk2... and many many others!

Yeah I was thinking of the BMW design as I was typing that. But my point was the specific difference in having separated plenums. At any rate, the way it will flow is what matters. I'm excited to see results.

Oh and the next time you want to give Skunk2 credit for that "ultra" manifold, post the manifold they copied instead. Kinsler

[VerusEric]

Originally Posted by Tim Radley

Maybe you are out of cam then or something else is holding it back. Exhaust and exhaust manifold type?

We're definitely exhaust limited on my car. Stock and stock until mid-pipe. We will do our best to test this manifold with a more free-flowing exhaust as well.

[Blu-by-U]

Originally Posted by NotEric6

1.25" height and seeing peak load somewhere around 7500. But for the most part its flat all the way to 8k RPM. Not sure what this translates to hp/tq wise but it feels great up there.

This was a FI intake manifold build, though for some reason most people believe we were building it for NA power. The fact it is performing NA leaves us with a lot of hopes for both platforms.



No need as I'm sure we can work something out with locals or their shop cars.

One more picture:

Was the deletion of the cabin sound generator required or preference?

[VerusEric]

Originally Posted by jdv14476

Was the deletion of the cabin sound generator required or preference?

Bit of both. I'm sure I could have found a way to keep it hooked up but realistically it isn't doing anything and I found it somewhat annoying. Furthermore, if you look at the passenger side, you'll notice that the fuel rail cover/ECU mount is no longer used. The intake sound generator bolted to this cover so it was time to fabricate a block off for me . This intake manifold makes quite a bit of noise itself as well, especially on tip in.

[rx3]

Originally Posted by NotEric6

The function of these bellhorns are being blown way out of proportion. Like previously stated, between peak and valley their is only 10 thousandths of an inch difference. We are not concerned that the ridges reduce or add any performance. We will not be sanding them.

Besides, these ridges are running parallel to the flow-direction. So, even if the difference between peak and valley was higher, they wouldn't really increase flow resistance. (This would only be an issue if ridges were running orthogonally to the flow direction.)

[fika84]

Originally Posted by NotEric6

We're definitely exhaust limited on my car. Stock and stock until mid-pipe. We will do our best to test this manifold with a more free-flowing exhaust as well.

You're close enough to JDL.. borrow their exhaust