Performance worsen after installing aftermarket air filter

[Izso]

O2/lambda at exhaust, i know.
that O2/lambda sense O2 in exhaust fume after combustion process, n adjust ECU AFR accordingly. usually in cruising speed.

MAP/MAF sense air pressure/mass in intake part.
use by ECU for AFR in closed loop mode.

some engine does have air temp sensor. so there must be some data taken from the air temp sensor for ECU calculation.

D7zul has corrected me already. And I stand (sit) corrected! And you're right about the MAP/MAF, my mistake!

Well, anyway - I honestly doubt the Viva has a temp sensor. The Myvi I'm very sure doesn't have one, both 1st gen and 2nd gen Myvis. Newest 3rd gen one I'm not sure but I don't think the engine layout has changed.

I think CAI is a debatable topic. Very hard to prove by dyno and when MightyCarMods tested this on that red skyline, the performance gain is so minimal.

 

[Maxx]

D7zul has corrected me already. And I stand (sit) corrected! And you're right about the MAP/MAF, my mistake!

Well, anyway - I honestly doubt the Viva has a temp sensor. The Myvi I'm very sure doesn't have one, both 1st gen and 2nd gen Myvis. Newest 3rd gen one I'm not sure but I don't think the engine layout has changed.

I think CAI is a debatable topic. Very hard to prove by dyno and when MightyCarMods tested this on that red skyline, the performance gain is so minimal.

i think mine (myvi) got the air temp sensor. can see it in airbox below air filter.

anyway, we r here to share information.. and slightly off topic.. haha

 

[DerrickEe]

Hi guys thanks a lot for your replies. Anyway,had a few test runs this time and it was much better than the first test run.That road that I first tested on was indeed an uphill,sorry my bad. Other than that,barely any performance gains except minor pickup speed,barely noticeable. In fact, no difference with stock paper filter. In my opinion,I think practical is better than theory.

 

[neohadri]

D7zul has corrected me already. And I stand (sit) corrected! And you're right about the MAP/MAF, my mistake!

Well, anyway - I honestly doubt the Viva has a temp sensor. The Myvi I'm very sure doesn't have one, both 1st gen and 2nd gen Myvis. Newest 3rd gen one I'm not sure but I don't think the engine layout has changed.

I think CAI is a debatable topic. Very hard to prove by dyno and when MightyCarMods tested this on that red skyline, the performance gain is so minimal.

Maybe because nowadays cars manufacturer made their airbox to be more efficent rather than just a tool for noise suppression only, they have fully uttilies helmholtz theory

 

[crazykatak]

Helmholtz Theory.. word that has long been mentioned by anybody :)

 

[C99D-MMC5537]

as far as i know, all car comes with MAP sensor will have air temp sensor. This is because MAP only read air pressure, cant read air temp. For those which using MAF sensor, dont need air temp sensor since the 'hot wire' in the sensor can read air temp and air flow in one shot. All perodua which using injection using MAP and come with air-temp sensor.

 

[pwhyze]

Helmholtz resonators and air inertial charging, in a Viva? I think you're giving Perodua engineers too much credit bro..haha.

 

[Izso]

i think mine (myvi) got the air temp sensor. can see it in airbox below air filter.

anyway, we r here to share information.. and slightly off topic.. haha

I see that sensor.. that's an air temp sensor? Uh.. I gotta go dig out the service manual and check again.

 

[LittleWhiteWagon]

Not to be a thread hijacker or anything, on smaller capacity cars does a drop-in filter actually give ANY sort of gain at all on the dyno? I'm just curious. :wavey:

 

[Izso]

Not to be a thread hijacker or anything, on smaller capacity cars does a drop-in filter actually give ANY sort of gain at all on the dyno? I'm just curious. :wavey:

I'm a poor DIY-er. If I were richer I'd do this as a potential Izso Mythbuster. Hehe

 

[LittleWhiteWagon]

I'm a poor DIY-er. If I were richer I'd do this as a potential Izso Mythbuster. Hehe

Pfft i'm sure a K&N drop in for your myvi would threathen your monthly budjeting.

 

[C99D-MMC5537]

Hi guys, yesterday I changed my heavily restricted OEM air filter on my Perodua Viva to an aftermarket drop in stainless steel air filter. Cap ayam brand for RM68. Well I was thinking,since its only an extra of rm20-30 from a brand new original air filter,might as well I give it a try.

The acceleration of the car from stationary position has definitely improved. But that 'feel' somehow decreases over time as it reaches 80km/h. I had a hard time accelerating after 90km/h, a really hard time. Only managed to accelerate up to120km/h and the meter just stops there at 120km/h despite flooring my pedal. Used to be able to run up to 140km/h without any hassle with stock air filter.

Clearly,the solution here is to change the aftermarket air filter to a more reputable one. But can someone explain to me what is the problem with this specific aftermarket air filter?

Thank you in advance.

Dont waste your money with this kind or stuff la. Even the accessories shop fancy colorful "cold air intake" not help very much in increasing cooler air volume into your intake. this kind of setup using very long hose and got too much curve from lower part of bumper to airbox.

This is what i do. minimal curve to air box (less than 1 feet hose length). using mercedes-benz high quality plastic a/c blower hose. never suck water too your air box even driving on highway in very heavy-rain (tested so many times) since this hose got groove, and running upward to airbox. FYI, i still using original paper filter inside. faster acceleration. manage to hit 160km/h GPS speed with 165/55R14 tyre. everything else is 100% stock. FC still same like before. 16-17km/l average for town driving. Cost: RM0.20 (for cable tie)

 

[ronaldindin]

if u done intake mod like port n polish, changed intake manifold, etc.. 'maybe' drop-in can give better result.
for std setup oem filter does the job well..

cold temperature can give more power/respond. ecu will detect temperature from intake sensor.
usually stock intake snorkel will get fresh air away from engine heat.

So actually it's not really recommended for stock car to put in this kind of performance part uhh.

ohh is it, what if re-align the air intake hose away from engine? Put it in grill area?

 

[LittleWhiteWagon]

So actually it's not really recommended for stock car to put in this kind of performance part uhh.

ohh is it, what if re-align the air intake hose away from engine? Put it in grill area?

It's not a performance part at all, an aftermarket drop-in filter does is allow fractionally more air in than the standard element. Anyways the only way to make use of that extra air is... to get your car tuned accordingly. You still keep the standard airbox, hoses, whatever noise cancelling chambers/pockets they have from factory.

But of course la with less restriction in the element itself the car will feel faster. Being actually faster thats a whole other thing. Also being reuseable it saves more in the long run if you're keeping the engine.

Unless on bigger engines, or engines that require more air, then there is a significant gain.

 

[Izso]

Pfft i'm sure a K&N drop in for your myvi would threathen your monthly budjeting.

I already have a drop in for my Myvi. Before and after (paper filter) to me there is a difference - the difference that I need to keep paying RM24 for a stupid filter everytime I wanna service the car whereas the K&N just dynamo wash it, re-oil it with my recharger kit and continue on with my life.

Poor bugger I am I tell you, I'll do anything to save a buck.

 

[ColdPlay]

Okay, here is what happened to my sister's 850cc manual Viva. She send in the car for service and the foreman managed to coax her
to change to aftermarket air filter which cost her more than 130 bucks.
Few days later, she complaint to me her car has a good acceleration but feel heavy at high speed.
When i tested the car, engine does feel lethargic going from 100km/h onwards. Open up the air box and check everything, suspected the culprit was the dirty throttle body. The better air flow add to build up the thickness of oil/dirt inside the throttle body in shorter time.
After throttle body cleaning is done, car has no problem reaching top speed. Next day, another problem pop up, this time check engine light. Removed the battery overnight and check engine light gone.

Question : Viva 850cc manual doesn't have the timing valve adjuster?

 

[damone]

Who says that normal paper filter is restrictive?

Driving in Malaysia with all the dust and black diesel smoke coming out from lorries, Id rather stick to paper filter than risk my engine.

Tried all sort of 'performance' drop ins and open pod. All will leave a faint film of dust inside the air box.

So imagine how much dust is ingested into your engine?

Driving in Malaysia can be considered one of the extreme conditions for a car.

 

[papagoines]

agrees with you on that, but finding oem replacement paper filter for my daihatsu mira L502 is kinda hard, once i found rm80 for one piece even then have to order. even drop in are practically non existance here in malaysia....

btw, for a turbo'ed engine owner... most will change to aftermarket open pod if changing to a bigger turbo

Who says that normal paper filter is restrictive?

Driving in Malaysia with all the dust and black diesel smoke coming out from lorries, Id rather stick to paper filter than risk my engine.

Tried all sort of 'performance' drop ins and open pod. All will leave a faint film of dust inside the air box.

So imagine how much dust is ingested into your engine?

Driving in Malaysia can be considered one of the extreme conditions for a car.

 

[Maxx]

agrees with you on that, but finding oem replacement paper filter for my daihatsu mira L502 is kinda hard, once i found rm80 for one piece even then have to order. even drop in are practically non existance here in malaysia....

btw, for a turbo'ed engine owner... most will change to aftermarket open pod if changing to a bigger turbo

for turbo, ill go for open pod.
it really does make a different. can feel more responsive n power.. even for stock turbo.
heated air around air filter doesnt effect much for turbo engine, bcoz the turbo already hot n got intercooler..

 

[LittleWhiteWagon]

Who says that normal paper filter is restrictive?

Driving in Malaysia with all the dust and black diesel smoke coming out from lorries, Id rather stick to paper filter than risk my engine.

Tried all sort of 'performance' drop ins and open pod. All will leave a faint film of dust inside the air box.

So imagine how much dust is ingested into your engine?

Driving in Malaysia can be considered one of the extreme conditions for a car.

I'm curious, what engine have you tried these 'performance' drop ins & open pods on? :hmmmm: