How much power does a Performance Air Filter add? DYNO PROOF! 

Its not all about the miles per hour Geoff, its the smiles per hour that matter! Brought back some memories this did 😂

Geoff's gone all giddy over his extra 2 horses. The old boy racer is now looking for a tunnel to take it for a blast and surprise everyone that is not a Vee Dub or a Collapsed Beemer making the racket!

The flat spot will probably be heat soak where the engine bay was getting hot from idling and when u accelerate the open filter in the bay is sucking hot air .. make yourself some duct pipes from a grill to the filter so it has a direct cold air feed. Colder the air the bigger the bang .. also TESCO MOMENTUM HAS THE BEST OCTANE LEVELS WITH MINIMUM PRE IGNITION KNOCK .. best proven pump fuel for performance .. iridium plugs will help and get a distributer rotor arm without the spring that cuts rpm .. the springless rotor arm will allow more rpm for around a fiver ..get some mass airflow cleaner and clean the mass airflow sensor ..great channel been watching for around 6 months .. my daily go to vids 👍🏻👌

"I'm gonna leave it on for a week...." We've all said it at one point, and we were all wrong 😄 🤣 😂 😆

6:45 the engine roar gave me warm fuzzies. One of my favourite things about driving on fast roads, opening the throttle the whole way.

Love seeing you relive your youth, this is basically what I wanted back in 2010, a Zetec Fiesta and a big air filter 😂 gave up as all the ones I looked at were rusty, and I thought arch rust meant an MOT fail... Amazing what you know at 18 😂 even though I've got much spicier cars now, I'd still have one in a heartbeat!

I keep watching 11:07 - 11:20 over and over... I seriously need another. Those 1.25s are SO good

Had a K&N on my Golf VR6, Sounded great to start with but for the longer trips you need to make a bucket shroud for the filter.

That cone requires heat shielding or you can lose them horses when it’s hot so I’d just use a panel filter. The panel filters boost is not going to be noticeable either & will be a bit quieter but the main reason I fitted filters to all my cars is there washable so they pay for themselves if you own the car 3-4 years. I now have a focus st with stage 1 so it’s about 275 hp 420 torque & stock filter is paper cone type so I swapped to green cone filter & it sounds awesome & probably 5 - 7hp gain on that because it’s turbo & higher powered cars will benefit more from filters…again the real win is noise response & washability but on that power level 5-7 hp is not noticed.

Had K&N sitting on Weber carb on my Mk3 Escort some 30yr ago. Seemed like great performance. Stuck a dodgy custom exhaust on it later which helped too. Great fun.

This was so classic and the the sly grin absolutely priceless best quid spent absolutely 😂

Who would have thought that a bit of drain pipe with a table lamp shade would add all that extra power, wow!

I've got a set of K&Ns for my 1977 Kwak Z650, ready for when the big strip and rebuild gets done. K&Ns plus a Harris pipe...one of the best sounds, ever!

Remember a car coming in to friends garage not running right after changing air box for k&n filter, when we asked where was the airbox etc was, he said he had thrown it all away, along with the maf sensor.

This takes me back. We used to put K&N's on nearly everything I think. Mostly for the intake noise!! I'm not surprised by the flat spot. I remember way back this frequently happened when you just fitted the induction kit and no other mods. I think (and it's a faint guess here) its something to do with greater volume of air but initially slower velocity when you put your foot down so there is a touch of hesitancy.. Something like that. I have to say the 1.25 16v engine is little peach.. Wasn't it developed by Yamaha?

these were 75bhp new, so its spot on its the later shape ones after 2008 which were 82bhp

Get a retest or/and get the dyno recalibrated because the K&N I had on my mk3 Escort definitely doubled its power. Just like the GKN spark plugs and the cherry bomb 😂

Love the video, known Chris for years, good guy to know 👍🏻

Flat spot is probably because its just been installed and the ECU can't compensate enough you may have to get it mapped and slightly bigger fuel injectors. I think a sports cat and cat back stainless system with no mid silencer, just back box to be next, then get it mapped and running all nice.

Lots of SPACE round the bits and a great place for the battery. Had a look round a friends Hybrid Lexus and there was a small lunchbox of room left in the engine bay. Plus a tray to catch all the 10mm sockets etc. Wow it was clean. Looking great for a £600 car. David and Lily.

Thanks for a fantastic, fun car vid. And for keeping the missed gear change in! 😂

Listening through headphones - the change in sound was amazing!

Hi, do you have an update or could you do a vid on the green 1203 skoda panel van thats been in a a couple of vids previously, i have a couple of old skoda cars from the 70's and would love to see more of this van, its a rare one for the uk for sure

Great video thats me off to grab a new filter. convinced me the sound is worth it..

Great video, dyno check is something we lacked the cash for back in the 90s, i also assumed 150 more horses hahaha

I have got a K&N Filter in my Toyota Yaris. And a slightly fruity back silencer box. Goes well! MPG up with the less restrictive back box too. 50mpg.

Was there some valve bounce i heard revving with no load. After air filter fitted. ???

My old polo’s exhaust had a small hole in it and was on the way out and was only £80 for a whole manifold to tail pipe so I was going to replace it before the MOT so decided to see how much I could rot it out by spraying water up the tail pipe. Rotted out the whole of the back exhaust box. Boy did it sound good to my 20 year old ears. Louder than my brothers X Flow Caterham, but had to change it in the end as I was sure I was going to get pulled by the rozzers. Fun times.

Chris seems a great/genuine petrol head. Probably see's /works on plenty of really exotic motor's but love's the simplicity of the Fiesta. 😅👍👍

I had same colour fiesta MK4 as my first car with a cone filter. I loved the noise 😂 same 1.25 engine aswell they are actualy 74 bhp. God that noise brings back some memories.

Great video, I'll see if I'm available that day for certain, it'll be a giggle to see what my classic mini 1380 does 😅

about 2% to 3% is actually a lot! Makes me curious how it turns out when people are putting such a filter at such a spot it only sucks in hot air, instead of the rather good location in the fiesta. Regaining power on old engine, check spark-plugs and fuel-injectors first?

Would love to see what a good tuneup does fuel injector cleaners change your fuel filters, oil change, transmission, and spark plugs see how much you gain just for maintenance

I've just fitted one of those to my EV, wow! What a huge difference it made.... another 250 BHP! Seriously though, fitted a DNA air filter and inlet and removed the cat and collector box on my Royal Enfield Meteor. Apart from a noiser intake and a fantastic exhaust note, I didn't really notice any improvement in performance. Maybe, because of the EFI, it may be running lean at higher RPM's....

Use good old redex and premium fuel up to the next test, and some Wynns oil supercharge to protect the old engine. Used both for years in many different cars never had any problems. Also quality multi electrode spark plugs. Good luck. 👍

why didn't you use the proper breather pipe that was on the filter? just wondering if a few more gains were left off the table there

I used to get more performance from my C230 KOMPRESSOR just by going out in the winter in negative temperatures compared to summer. Colder air is more dense.

Question please, what would happen if you added an electric squirrel cage blower to the front of the intake system. More power, fuel efficiency, or engine problems?

What about drilling the original air box above filter for more air flow would the increase if any be cheaper than buying a KN filter. Loads of air box mods on various sites and vehicles but do they really work.

Considering the cars Chris is normally dealing with I bet you are a breath of fresh air with your golden oldies 😃I don’t think my guess was to far off😊 De cat and let the old girl breathe better

Because I love your videos I'm now a previously uninterested car enthusiast watching car videos!!! My son put one of these in his car, now I have better understanding plus my son thinks I'm a tiny bit cooler..thanks Geoff!!!.......'conspiracy' and cars!!! Working it!!! Perfect combo!! like murder and make-up (Bailey Sarian!!)

This brings back memories of my turquoise k11 micra 😅 the metal finned air filter just made it every bit the race car I wanted of it 😂

Fitted one of them in 5 minutes back in the day.

75 to 77 bhp is a whopping 2.67% increase the figure K&N put in their blurb (not) on encouraging that dude to buy the filter. ( p.s I used to re-jet cars back in the day to gain extra bhp there was always a noticeable difference). Used a carburettor shop in Hillingdon Middlesex on the Uxbridge Road.

I’ve seen several dyno tests on you tube recently involving older cars and all made stock power. People say cars lose power with age but these tests show that often they don’t if they been serviced regularly and are running well.

Good on you Mate.

I put silkolene pro boost in my old saab 900 turbo. Worked a treat!

That sounds fucking incredible around 7:10. The memories flooding back!

Turn the throttle position sensor round a bit. put bigger injectors in it from a 2.0 - there you go. put a potentiometer on the 02 sensor, turn till it's not too rich. It should sort itself out by itself on a run - then dyno it. It will run funky. But 50%+ power. drink fuel. spit fire.

Brings back memories 😊

Geoff - Newsletter? I'm not on Faceplant so miss a lot, how do I sign up to the newsletter?

I thoroughly enjoyed that!!

This shape fiesta should be 75ps for the 1.25 and 90PS for the 1.4. It should also have a small black sticker saying as such on either the air box or rocker cover

It's all about the sound.

Can you feel the passion, running through my veins, driving me insane

Did the ECM get remapped with the filter install? You won't get all the gains until you remap the ECM

Big bore exhaust is a must Geoff defo up for a track day where you thinking ?

I miss my MK4 Fiesta, it was a Mazda 121 and was basically the same. It has one of those airs filters and it didnt sit in the box cause the box was completely removed, The little thing just destroyed the miles until the air filter sucked a flooded road up into the engine.

Really recommend this guy .

Mind 5th gear did varying mods on a VW Corrado and gained the best BHP with redex.

Sounds great. Wish id done that to my mum's when she had it!

Had a 1998 mk4 fiesta with 40k miles on it was absolutely mint and the Kent engine loved to be revved. Had a subaru exhaust on it and wheel spun everywhere wish I never got rid but got my mam to write it off 😂

We had one of those my wife and Eldest daughter sort of wrote it off between them. I got a call from D saying she got it stuck between two trees over the wold tops. It got fixed but shortly after the Eldest daughter finished it off😢

Great Video!

In Halfords, they sell octane booster think it’s about £15. I’ve put it in my M3 Evo be surprised how different it feels.

That's not bad at all. Also that MK4 is a great looking example

Jeff, it is the glass stickers that add the really extra bhp.

Spend your cash on getting the aircon fixed 🥵 Great video as always Geoff.

Was the original filter clean🤔

When tested stock was it a clean/ new air filter, surly a good service would be the best bet to regain some lost ponies

Nice one Geoff.👍

I fitted one of those and a big Bore exhaust to my old 2003 Corsa years ago and it made it slower lol

You have to change the needle valve as well so it can pull in more fuel, so it can use all the extra air it can pull in.

I'll have a spot on your Dyno day 3.0 si z4 coupé one of 5 in phoenix yellow registered in the UK , bought originally from Worcester 😁

How many runs do you get for your £50? I ask as I'd like to do what you have done today on my 96 850 T5 manual

I thought the 1.25 was meant to be around 73-75bhp, maybe looking at a later model if it have over 80

You can always get a bit more suck squeeze bang and a blow with a big enough tube, also bigger lobes on your shaft which opens the valves on the head for more air and liquid to get in for an even bigger bang, at least that's what I was told, I had a very basic education, I read it in a Haynes manual.

If you're sucking more air in, you need to throw more fuel in and more exhaust out to make any significant gain. Bigger injectors and straight through pipes 😁?

i put one on my 2011 jag xfs it went from 270 bhp to 322 bhp and over 520 torque after a little tune and it sounds awsome

Is it rusty like most other Fiestas of this age?It does look clean.1.25 is a great Yamaha designed engine.

Back in our day minis and escorts unless the engine was set up around the kn they just lost power but that was the day of carbs

DID YOU TUNE IT OR JUST GAIN 2HP WITH CAI?

Love it Geoff 😁

It's got 75 standard at the flywheel If you compare the power at the wheels it will give you a better set of real world figures It would be nice to see what sort of Dyno it is and what ask the numbers are at the bottom 👍

A chip and bigger injectors and exhaust work well on these

Ebay Chinese intercooler & turbo with bigger injectors, the turbo would allow you to have it in a higher gear more if sized right so the spool time is quick! It would get better mileage as crazy as it sounds!

I expect you have informed your ins co about this mod!

Sadly those gains would probably be lost again on hot days once she’s up to full temp. It’d be interesting to see what she makes with a K&N element in the factory air box👍🏻

Geoff mate, here you go get an ECU remap lol, sounds like a six cylinder 68 Mustang; but much better than our 1995 N Reg Golf 1.6 75hp that we had in 2007!! Would love to bring our XC60 T6 Turbo to see what it's got under the hood, but might cost a fortune from Switzerland!! Best Regards from Switzerland

An air filter upgrade won't do much, Unless you change the exhaust manifold, and tweek the ecu. Cats may need to be Upgraded as well.

It can’t be any more than the fiesta without any filter. Perhaps you should run it without any filter and then with the K&N and compère it to the standard setup.

I used to obsess about VW, and drove many. I own a Mk7 gtd and used to own a Mk5 gt. They rust like you would never believe. I had a mk6 Fiesta, a lovely little run around and cheap as chips, well the chips before 2020. I have a transit connect, fantastic, and very comfortable. Ford is the way to go.

Quite amusing seeing something on a RU-vid dyno video that isn't trying to break out of the straps 😂

Don’t forget to clean, dry and re-oil the K&N filter every year! All the best!

Speaks volumes when the dyno operator wants to buy your econobox, but here in America if your car made those numbers you'd do your best to keep it under your hat lol. The 3.1 v6 in my Buick Century supposedly makes 195hp and the 4.3 Vortech v6 in my Safari makes 220, both are over 9.1 compression so you can really feel when you use premium gas.

Put some new plugs in,decat & ram some air through to the new performance filter oh & dont forget the fluffy dice😂❤it

Turbo next? 😉😉

I got a k&n air filter for my van. No real difference in horsepower or fuel consumption. Where it did make a difference was in improving the rev response of the engine.

I had a k@n on my corsa b back in the day it would bog down with all the heat 🤣 The increase in mpg isn’t really worth the noise,panel filter would be better.

dyno automatic?i have a 2001 volvo t6 saloon car.