F8 1.8 Intake manifold - Jessie - Page 2

**skj0lsvik** · 1-22-12, 13:48

Alright, thanks! I might skip it then.. Would it be smarter to build a new top-plenum out of alu with a 70mm tb than searching up a complete f8-dohc intake? If I'll build a new top-plenum I'll use the original fe3 wics intake.

**lundgren420** · 1-22-12, 14:05

Why? I though of doing a similar top plentum for the F8. But the connection of the VICS intake would be way more complicated. If i wanted a new intake solution, I would just build a short runner D shaped manifold with about 3L of volume and a Q45 90mm TB. This would be for a large turbo FE with a ported head though.

**bpt323** · 2-12-12, 2:23

I call bull[shizzle] on the whole thing.

The FE-DOHC manifold's weak point is the amount of flow allowed to the VICS plenum chamber.

A properly fed VICS chamber (FE-dohc) will show gains where its needed.

Look @ modifying the top half of the inlet manifold to openly feed the VICS chamber
& a RPM controlled VICS activation system can be based off of a fully closed dyno run & a fully open dyno run & plotting the best opening point accordingly.

Proper activation & proper feed are key's to a full powerband.

F8 manifold simply has the VICS missing. similar to the layout of a F2T inlet manifold

**lundgren420** · 2-12-12, 11:10

F8 has no VICS Ryan. I also have the FE intake with a chamber passage cut to allow the butterflies their own air flow.

**skj0lsvik** · 2-12-12, 11:28

Lundgren, would you say you gained anything with that mod?

**lundgren420** · 2-12-12, 11:47

I have yet to test it on the turbo virson of my engine. I anticipate loosing some low end takeoff pawer, but it shopuld make up for it in the top end. Schwin617 was the first one to pioneer this on MX6.com and he posted his results.

**bpt323** · 2-12-12, 13:03

im well aware it has no vics.....

what im saying is that VICS is not a bad thing if properly fed

**lundgren420** · 2-12-12, 17:25

I was just saying that the F8 intake is choaking the 2.2 or 2.0 turbo motor befor it reaches peak power.

**jesiotrot** · 2-12-12, 22:17

I dont think its the intake manifold choking your setup Lundgren, mine produced plenty of top end power with the F8 manifold and it only had a baby little turbo on it.

It might be your FEAP cam, but that should only make a few hundred rpm difference in peak power/torque.

**mazdarati3030** · 2-29-12, 14:40

its DEF the FEAP cam.

we fitted a motor which had FEAP and FE3N cams - the motor fell at least 10-15kw short.

we swopped the cams for FE5A`s and it was back to its full power. but no one here has done the F8 manifold swop on a turbo-fed Fe dohc.

I can only speak about naturally aspirated FE DOHC`s - its works - its right there 10kw, however, just a note i think i should mention.....both cars which experienced gains had FE5A`s in them.

i never mentioned it initially because all the originally built FE DOHCs here in South Africa ALL come with FE5A`s. only imported motors have the FE3N and FEAP cams in them.

I think with Lundgren that cam is causing the power to drop.

I posted somewhere else that i swopped FE3Ns with FE5A`s - a direct swop and the result was that power and torque came in earlier, and i gained some more torque as well, but it dropped at the same point, and although i got the same power firgure, the power flattened out on top a bit....not much, but a bit.

**bpt323** · 2-29-12, 18:18

lundgren. i have a kia intake cam If you want it just pay shipping. same lift specs as a FE3N cam.

-Ryan

**mazdarati3030** · 3-1-12, 4:43

Ryan, whats the part number on the intake cam? FE3N?

**matt89glturbo** · 3-2-12, 10:44

yes, at least on the 3 kia ones I have, FE3N

haha...tired typo...I only have 2 kia engines...other stats still apply, though

**mazdarati3030** · 3-6-12, 13:13

not too bad then hey!