I went 1800 miles on my drz400sm before cleaning the air filter and the inside of it looked new and it all seems fine haha 😂at least I change the oil more than recommended
Hey Rich. Thanks for doing these. I'd love to see a video of tuning the air screw ( after idle screw mod) and power valve on a 2021 Ec 300 TPI. Would like a crisper throttle response. Cheers
great video! Is it possible to do a perfomance comparison between different cylinder base gaskets? Because I'm about to change mine and there are a lot of rumors on the effect, that this process brings with and there's not a single dyno test out there to prove the outcomes. Would be great to see how it actually changes the engine characteristics and it would also enable people to modify their bikes the way they want to. Please keep up those very informative videos😅
I think you could try another tuner that checks the powerband throughout the powerbands. I think it is tuning. No offense to other tuners but most tune for quickly opened WOT and nothing else. I start at 3% throttle and tune in all increments showing on the grids. He done well for me
The reason the HP goes down and the Torque goes up with a dirty air filter is because of the same affect as running a smaller or larger carburetor / throttle body. The higher mass of airflow from a larger carburetor / throttle body generates more top end HP. The lower, higher velocity, airflow of a smaller carburetor / throttle body generates more torque.
I think this might help explain it - air intake velocity increases with "longer" intakes, which is the effect a dirty filter will have so you will get more power at lower RPM due to an induction effect caused by your dirty air filter - effectively you get more air in with a dirty filter.
when you said that the dirty airfilter makes the carbureted bike run a little bit rich on the bottom end, whats essentially happening is that the dirt is almost acting like the choke, making it hard for the engine to pull in air, thus pulling in more fuel
Easy, dirty filter gets you a richer mixture and more torque. To a point that is, after that it goes down fast. Personaly i change clean filter every ride and hove no problems with mechanical failures do to sand in the engine.
4:00 Toyota 4age and Nissan ca18 engines have butterflies in the inlet after the throttle body to limit air volume to increase airspeed. In NA engines you don't want a 10" throttle body and 10" exhaust, for any given power figure the engine is consuming a certain volume of air. Finding the fastest way to ingest it is key
How many times was this test repeated? This 3% variance can probably be explained partially by a testing difference than an actual performance difference between the filters. I assume that when impartial labs seriously do dyno tests, they run the same test many times, rule out the extreme low and extreme high results, and then use an average of all other tests.
Interesting. March 1995 MXA put clean vs dirty filters on a dyno. The dirty filters outperformed the freshly oiled filters above 6,000 rpm on a CR 250. Their conclusion was that a freshly oiled filter was more viscous. Therefore more restrictive of airflow that the drier dirty filter.
In case of that torque... I think that dirty filter changes the ratio between the air and the gas so its runnin more rich therefore it has a bit more torque in lower rpms.
The 110/100 - 18 IRC VOLCANDURO rear tire is competing with Dunlop on Cebu island for all the trail riders. Drop the price of this specific bread-and-butter tire and all the trail riders will purchase it. Same for the 21" knobby front tires and 4.10 18" rear tires.
It would be interesting to test the dirty filter with leaner jetting to see how the power curve changes. My take is that the bike runs richer with a dirty filter, and hence, more torque. The question is; is the top end power limited by the jetting (dirty filter equivalent to a couple main sizes richer) or by the amount of air the engine can take in?
obviously a clean filter needs richer top ends by the amount of air than a dirty filter can take at high rpms... but curiusity, a dirty filter put more low end torque
The 2020+ KTM's (including this GasGas) have an O2 (or lambda) sensor. If it's working as intended the bike should be reducing gas to match the reduced air.
Up in central oregon our filters look like the extreme dirty one after a single ride. Apart from the 1-2 months out of the year when we get some rain :/
In southern Oregon around Medford and Grants Pass November until April the air filter stays clean (unless you get water on it) because the ground is mostly moist for 5 months. We spend a lot of time cleaning mud off the bike.
Next test should be on the "flow bench" or " manomiter . So you can answer , why it makes more bottom end torque dirty ???? Far as I know increase in velocity will do that . But a dirty filter ???? This does raise some questions!
I think this an inertia dyno, in which the bike accelerates a flywheel instead of holding against a brake at fixed rpm, then power curve is calculated. I believe in reality engine power is lower at all rpm, loss is bigger as RPM ingrese tough
Same here, hate this dirty stuff.. So I just ride it to the point when it's same as Rich's dirty filter and then throw away and replace with new one -)))))
@@MichaelAbramo yea. I don’t got a problem cleaning it but I did my first oil change the other day along w an air filter change. The bike came w a used air filter which looked clean to me🤷🏾♂️ it was hard Nd after I put the oil on it it was gummy😂😂😭. I put it on like that Nd my bike was running like shi* almost stalled out. i just cleaned the air filter Nd the texture of the air filter is now soft Nd pillowy hopefully it will run better when they dry from the cleaning and with new oil. I could see why it would of been running bad bc no air could get through that. That filter was like a cake when I put it on thinking it was clean😂😂
I ride a 2020 300xc tpi. I rotate a clean filter in after every ride, but that’s just being anal and preventative I guess. I could go a lot longer. They’re tucked and hidden so well it takes a lot longer to get dirty. Is it overkill? Probably, but I still do it lol. I have 4 Pro Line Funnel Web filters and 4 Twin Airs I keep clean and on rotation. It’s like my oil changes. Every 12-15 hours I change the oil I’m always disappointed when I drop it because it still looks clear and like it could go 15 more hours easily lol. I paid a lot for the bike so I just make sure I keep it in tip top shape. I could probably loosen up and not be as maintenance crazy, but I want to keep the bike in the best shape possible until I upgrade. So far 77 hours in it’s still rolling strong! Maybe some of the guys who never change air filters or neglect maintenance will see this and the light bulb will go off and they’ll start taking better care of their stuff lol! Awesome video nonetheless!
i've only been riding for 3 yrs so all new to me but i change my filter every ride. I thought everyone did lol. I have a 2021 300 exc and do oil changes every 10 hrs . Prob overkill but i enjoy working on my bike
@@enduroslug1317 I know guys who change their air filter once a month if that lol. I’ve been riding for 30 years and I do my maintenance by the book and then some. The more fresh you keep the bike, the longer they last. They can say it’s overkill, but I don’t care. Just keep doing what you’re doing and you won’t be the guy ruining a ride because of mechanical failure lol. I just believe in taking care of my things.
you can send a comment/feedback to the BLM or whatever federal service is accepting the input. It's online and some western alliance is the organization pushing for the closure. Speak up and use that voice if you ever plan to ride out there.
Haha! I honestly didn't realize, I didn't add a clip of the bike running on the Dyno. I edit all these videos myself and somethings get lost in the hustle to get a video out! I'll make sure to add clips of the bike on the Dyno in the next videos. Here are some pervious Dyno Tests we've done, there's actual Dyno time in these ones. Pipe Tests czcams.com/video/-M4KrGQwKzY/video.html Low Compression Head czcams.com/video/UOKD3QcwEzY/video.html
Dang 100 hrs with no maintenance. Really makes you ponder the meaning of life.
If the dyno guys were checking air fuel ratio that would have shined light as to why this was occurring.
I switched to IRC tyres a few ride ago and I must say they are an awesome tyre! I notice them even at my ordinary riding level. 👍💯
Sweet. This makes me feel a lot better about recently halving my KTM's filter maintenance from 1 to 2 hours :D
I went 1800 miles on my drz400sm before cleaning the air filter and the inside of it looked new and it all seems fine haha 😂at least I change the oil more than recommended
Hey Rich. Thanks for doing these. I'd love to see a video of tuning the air screw ( after idle screw mod) and power valve on a 2021 Ec 300 TPI. Would like a crisper throttle response. Cheers
great video! Is it possible to do a perfomance comparison between different cylinder base gaskets? Because I'm about to change mine and there are a lot of rumors on the effect, that this process brings with and there's not a single dyno test out there to prove the outcomes. Would be great to see how it actually changes the engine characteristics and it would also enable people to modify their bikes the way they want to. Please keep up those very informative videos😅
Great videos. Could you make a video explaining the selection of gears according to the obstacle? Thanks a lot!
Very awesome info!
Great content.
I think you could try another tuner that checks the powerband throughout the powerbands. I think it is tuning. No offense to other tuners but most tune for quickly opened WOT and nothing else. I start at 3% throttle and tune in all increments showing on the grids. He done well for me
The reason the HP goes down and the Torque goes up with a dirty air filter is because of the same affect as running a smaller or larger carburetor / throttle body.
The higher mass of airflow from a larger carburetor / throttle body generates more top end HP.
The lower, higher velocity, airflow of a smaller carburetor / throttle body generates more torque.
I think this might help explain it - air intake velocity increases with "longer" intakes, which is the effect a dirty filter will have so you will get more power at lower RPM due to an induction effect caused by your dirty air filter - effectively you get more air in with a dirty filter.
when you said that the dirty airfilter makes the carbureted bike run a little bit rich on the bottom end, whats essentially happening is that the dirt is almost acting like the choke, making it hard for the engine to pull in air, thus pulling in more fuel
Easy, dirty filter gets you a richer mixture and more torque. To a point that is, after that it goes down fast. Personaly i change clean filter every ride and hove no problems with mechanical failures do to sand in the engine.
And it would seem the bike is relatively leaner (too lean?) in lower throttle/rpms, and richer on top (on the pipe)
If its fuel injected it won't be richer. The engine uses a map/Mac sensor to measure oxygen and load to calculate fuel
The bike runs richer with the air restriction giving it more torque. Loses horsepower on the top end due to lack of air flow.
Sounds like we need variable valve timing in these bikes to get the best of both worlds eh?
4:00 Toyota 4age and Nissan ca18 engines have butterflies in the inlet after the throttle body to limit air volume to increase airspeed.
In NA engines you don't want a 10" throttle body and 10" exhaust, for any given power figure the engine is consuming a certain volume of air. Finding the fastest way to ingest it is key
How many times was this test repeated?
This 3% variance can probably be explained partially by a testing difference than an actual performance difference between the filters.
I assume that when impartial labs seriously do dyno tests, they run the same test many times, rule out the extreme low and extreme high results, and then use an average of all other tests.
Interesting. March 1995 MXA put clean vs dirty filters on a dyno.
The dirty filters outperformed the freshly oiled filters above 6,000 rpm on a CR 250.
Their conclusion was that a freshly oiled filter was more viscous. Therefore more restrictive of airflow that the drier dirty filter.
In case of that torque... I think that dirty filter changes the ratio between the air and the gas so its runnin more rich therefore it has a bit more torque in lower rpms.
yip
The 110/100 - 18 IRC VOLCANDURO rear tire is competing with Dunlop on Cebu island for all the trail riders. Drop the price of this specific bread-and-butter tire and all the trail riders will purchase it. Same for the 21" knobby front tires and 4.10 18" rear tires.
It would be interesting to test the dirty filter with leaner jetting to see how the power curve changes. My take is that the bike runs richer with a dirty filter, and hence, more torque. The question is; is the top end power limited by the jetting (dirty filter equivalent to a couple main sizes richer) or by the amount of air the engine can take in?
obviously a clean filter needs richer top ends by the amount of air than a dirty filter can take at high rpms... but curiusity, a dirty filter put more low end torque
The 2020+ KTM's (including this GasGas) have an O2 (or lambda) sensor. If it's working as intended the bike should be reducing gas to match the reduced air.
The point most people miss it the correct cleaning and re oiling of a filter.
Were you logging AFR?
Up in central oregon our filters look like the extreme dirty one after a single ride. Apart from the 1-2 months out of the year when we get some rain :/
One race day at Fire Mountain SE and mine looks like the extreme dirty one. Yup.
In southern Oregon around Medford and Grants Pass November until April the air filter stays clean (unless you get water on it) because the ground is mostly moist for 5 months. We spend a lot of time cleaning mud off the bike.
@@riders.oregon4474 I recently moved to GP and am looking for riding buddies. Wanna meet up sometime?
Next test should be on the "flow bench" or " manomiter . So you can answer , why it makes more bottom end torque dirty ???? Far as I know increase in velocity will do that . But a dirty filter ???? This does raise some questions!
What brand filter oil do you use? For that matter which lubricants do you use and why?
Motul products exclusively.
With a dirty filter at low rpm you'll have a richer fuel mixture accounting for more torque.
My guess is the dirty filters run richer in the rpm range and the engine makes more power as TPI is lean.
I think this an inertia dyno, in which the bike accelerates a flywheel instead of holding against a brake at fixed rpm, then power curve is calculated. I believe in reality engine power is lower at all rpm, loss is bigger as RPM ingrese tough
100 hours... wow. What year was the KTM?
2020
No sorry I was wrong. That was a 2021
I emailed you guys and still waiting on a response. How can I contact you guys directly?
Who are you trying to contact? Irc?
100 hr without maintenance? I wanna see this!
👍👍
100 hrs no maintenance guys must’ve fouled some plugs with that nasty air filter right?
I don’t notice any difference, I just ride the bike!!!!😂🤣👍👊✊😝
Guilty as charged...I hate cleaning filters haha.
Same here, hate this dirty stuff.. So I just ride it to the point when it's same as Rich's dirty filter and then throw away and replace with new one -)))))
Just buy 3 or 4, rotate them, then spend 15 minutes cleaning all at once
Me too, usually replace them like after 20-25 hours or so when they are very dirty and never had engine problems on my TPI.
@@MichaelAbramo yea. I don’t got a problem cleaning it but I did my first oil change the other day along w an air filter change. The bike came w a used air filter which looked clean to me🤷🏾♂️ it was hard Nd after I put the oil on it it was gummy😂😂😭. I put it on like that Nd my bike was running like shi* almost stalled out. i just cleaned the air filter Nd the texture of the air filter is now soft Nd pillowy hopefully it will run better when they dry from the cleaning and with new oil. I could see why it would of been running bad bc no air could get through that. That filter was like a cake when I put it on thinking it was clean😂😂
I ride a 2020 300xc tpi. I rotate a clean filter in after every ride, but that’s just being anal and preventative I guess. I could go a lot longer. They’re tucked and hidden so well it takes a lot longer to get dirty. Is it overkill? Probably, but I still do it lol. I have 4 Pro Line Funnel Web filters and 4 Twin Airs I keep clean and on rotation. It’s like my oil changes. Every 12-15 hours I change the oil I’m always disappointed when I drop it because it still looks clear and like it could go 15 more hours easily lol. I paid a lot for the bike so I just make sure I keep it in tip top shape. I could probably loosen up and not be as maintenance crazy, but I want to keep the bike in the best shape possible until I upgrade. So far 77 hours in it’s still rolling strong! Maybe some of the guys who never change air filters or neglect maintenance will see this and the light bulb will go off and they’ll start taking better care of their stuff lol! Awesome video nonetheless!
i've only been riding for 3 yrs so all new to me but i change my filter every ride. I thought everyone did lol. I have a 2021 300 exc and do oil changes every 10 hrs
. Prob overkill but i enjoy working on my bike
@@enduroslug1317 I know guys who change their air filter once a month if that lol. I’ve been riding for 30 years and I do my maintenance by the book and then some. The more fresh you keep the bike, the longer they last. They can say it’s overkill, but I don’t care. Just keep doing what you’re doing and you won’t be the guy ruining a ride because of mechanical failure lol. I just believe in taking care of my things.
torque perfs reversed ! speed flow of air ... dirt filter slows down the air flux and create more back depression in intake system
I heard that 300k acres of orv land is getting shut down in Utah
you can send a comment/feedback to the BLM or whatever federal service is accepting the input. It's online and some western alliance is the organization pushing for the closure. Speak up and use that voice if you ever plan to ride out there.
They are trying. Slavens Racing (Jeff Slavens) has info on how to contact BLM.
Engines are air pumps. More air mobetta
Where's the 100hr air filter dyno test lol I wanna see that crusty thing
No demonstration wtf
Just wasted my time watching this and there wasn't even any dyno time. Wtf click bait bs is this
Haha! I honestly didn't realize, I didn't add a clip of the bike running on the Dyno. I edit all these videos myself and somethings get lost in the hustle to get a video out! I'll make sure to add clips of the bike on the Dyno in the next videos.
Here are some pervious Dyno Tests we've done, there's actual Dyno time in these ones.
Pipe Tests
czcams.com/video/-M4KrGQwKzY/video.html
Low Compression Head
czcams.com/video/UOKD3QcwEzY/video.html