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MartinT

HKS Intake Duct

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I've ordered one of these HKS Intake Ducts, the shorter mark II, to replace the standard snorkel.  Having done pretty much everything else to get NA performance, it seems silly not to replace the snorkel with something better.  Has anyone tried one?

nengun-5047-20-hks-air_intake_duct-c3822

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Can you feel any gains at high revs?
Not that I can tell. There is more noise like I say and that makes it feel quicker I believe

Sent from my LYA-L29 using Tapatalk

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Looking at the standard snorkel, it does look restrictive.  Ah well, it doesn't look too hard to replace so we'll see.

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29 minutes ago, MartinT said:

Looking at the standard snorkel, it does look restrictive.  Ah well, it doesn't look too hard to replace so we'll see.

It's not, and Cosworth didn't find it a restriction on the SC either.

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13 minutes ago, MartinT said:

I believe they redesigned it because the previous big scoop version restricted airflow to the radiator?

Can't see there being much restriction to the radiator with the old version. From @Badger pictures above it doesn't seem much different to the oem set up in terms of any radiator coverage 

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Agreed, but I read that on my search through the internet as to why the design changed.  HKS only talk about "10x the opening" in their blurb.

As for the Cosworth SC, surely forced induction gets around any restrictions in air flow, to a degree?  It's NA that needs every assistance in getting more air into the cylinders.

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1 hour ago, MartinT said:

surely forced induction gets around any restrictions in air flow, to a degree?

No, you want the least amount of restriction upstream of a positive displacement blower. As said, the OEM design is to help remove noise and resonance. The sizing is perfectly adequate for 200bhp.

https://www.ft86club.com/forums/showthread.php?t=49634

https://www.ft86club.com/forums/showthread.php?t=56341

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So a little more throttle response and a tiny bit more torque.  What's not to like?  The FA20 needs every bit it can get.

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Got it done. Refitting the bumper is a bit of a bastard.

No change in sound that I can detect (so much for all those resonators), but it's a bit more willing in pickup and revs nicely. Not a lot in it, so marginal value.

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I did the HKS a slight disservice.  Further driving reveals a noticeable willingness to rev to the red line - my rev limit light (set to 7000) flashed twice in the last day, catching me out while accelerating onto the motorway.  From that point of view, it's worth having as overtaking is a touch easier.  Still no change in sound from before, which doesn't bother me as the exhaust is loud enough anyway.

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