fiestaturbo.com

[Paul R]

After having my Fiesta Turbo for about two years now I got tired of the dump valve sound so i took it off, and now i'm bored of the fluttering sound i get through my K&N cone filter, so i'm thinking of putting my airbox back on. I've seen a few posts concerning airbox (with K&N panel) vs Cone filter's, is there any bhp gain from either type of filter?, I'm running around 16psi at the moment so will I still get any fluttering sound even if quiet?? Also would the airbox stop hot air from the engine bay from getting in the filter??
Answer's on a post card please!!!

[Paul Taylor]

Paul,

Sorry I don't have an answer for you as of yet but I'm in the same boat! I removed my dump valve and I found the fluttering through the K&N Cone Filter personally sounds nasty. I have now removed that and refitted the original airbox with the original element. Unfortunately while in the process I noticed a couple of worn pipes so my FRST in now off the road for a couple of days, hopefully! I will let you know what it sounds like once it's up and running!

From previous experiances though I remember the car feeling less responsive & quieter due to no induction roar/less noise from the turbo spinning!!!!!

[Paul Taylor]

Paul,

I'm now running my FRST without the D/V and with the Original Airbox and It's really quiet but you can still hear a slight fluttering from the air filter. I think I'm going to put the D/V back on since I can't stand that fluttering noise! I'm also currently having a total nitemare with the boost pressure so I dunno what the hells going on!!!!!!!

[JJ]

I run the std airbox on mine, with a std Ford air filter, as recommended to me by Ahmed. No DVs, no K&N What I did was to drill a series of holes in the bottom of the air box (25mm diameter) to allow more cold air in. It is only slightly noiser and you can feel the improvements!!

[The Bruster]

Erm, duno if its possible on a fysta, but on my Soarer the dump valve recirculates into the exhaust, so the exhaust pops/hisses when it *ahem* blows off.

[Gaz7]

i have a standard airbox and paper filter, which i renew nice and regulary. Just as Mr. Ford intended!

[Gaz7]

And as its only a couple of quid a time for a filter with my discount, it works out cheaper than the cleaning fluid for K&N's by a fair way!

[Paul Taylor]

JJ,

But does'nt drilling holes in the bottom of the air box just increase the amount of HOT air into the engine???

[JJ]

Errr, no, cuz the bottom of the air box vents into the inner wing and not into the engine bay. I also added some holes in the side of the box, facing into the outer wing. I could go mad and add an air feed from the front of the car to the bottom of the box, but there's already a nice little port on the front of the OE box anyway

[Paul Taylor]

JJ,

Out of intrest how many 25mm holes did you drill in the bottom and side? Do you find that you can hear the turbo more now and that it is more responsive?

I found that when I had the K&N 57i on mine that it made the turbo sound alot louder and that it wound up quicker than with the OE Air Box set up? Maybe I need to do the same as you.

[JJ]

About 6 in the bottom, 2 in one side. I found gains at the mid/top end (speculative, but it feels more responsive) and a friend modded his Fiat Coupe 20V turbo in much the same way and saw genuine gains on the rolling road. I've tried cone filters, K&N panel filters and the std box/filter is no less responsive

[Paul Taylor]

JJ,

Do u have a Dump Valve? If so which one and what differance do u find it makes apart from the sound?

[JJ]

Dump Valve?!! *LOEL* Errrr, would you like the polite answer?!!.............no

[Paul Taylor]

Rite then, I mite try drilling some holes in the bottom of my airbox keeping the original panel filter aswell. I've heard that the uprated panel filters are a waste of time?

At the moment I still think that my cone filter was more responsive than the original air box/filter.

[JJ]

The mods on mine certainly seem to have enhanced the breathing at the top end, which works superbly with Ahmed's cam - the car really pulls hard from 4000rpm onwards. I gave the mota a good thrashing recently, and it's certainly much more responsive, pulling the limiter very quickly and cleanly....in 5th!! (on a track, of course ).