Cold Air Intake Temperature Reading

[SideHogger]

Alex Keaton ? ,

Funny. I would post name but would want his permission first!

 

[DooZ]

Do you not notice improved throttle response with the k&n setup ?

Ill have to take a look again..... why would clutches tun cooler with plastic airbox. ?

Because the installed location of the aftermarket CAI blocks or substantially restricts outside air flow to the clutches

 

[KnappAttack]

Knapp do you have the google bag installed above your handle bars? There is so much heat in my bag. I am going to run it with the factory screen to see if that helps let the heat escape quicker.

No goggle bag. Factory screen.

Do you not notice improved throttle response with the k&n setup ?

Ill have to take a look again..... why would clutches tun cooler with plastic airbox. ?

I notice increased RPM with K&N and a bit higher boost levels, I believe its less restrictive, so it should be making more power, on the other hand, it also heats the intake temps higher and faster, and when intake gets to a certain temp like 90-100, which doesn't take long, it will start pulling timing & power along with adding fuel & reducing power. You end up going from 270 HP down to about 230 HP.

I notice no difference in throttle response myself.

The K&N or CAI (the engine) consumes more air than can flow thru that front screen alone so it also draws in air from around the clutches. How do I know this? Easy, the filter is full of black belt dust!

If its drawing in belt dust from the clutch area, its robbing any available cool air from the the front vent that would be available going to the clutches and belt.

1. I believe the CAI to be a detriment for a couple of reasons, it sucks hot underhood air, its not cold under the hood.

2. Although its less restrictive and may make a bit more power that way, it also would spool the turbo harder and create that additional heat. Fine for when the intake can stay cooler, but not good when the intake heats up.

If you get it out of the hood its sucking cold air and will work much better, which I did last season, but it got way too lean for my liking. I was running 12.8-12.9 AF running it outside the hood, better have good octane to run that lean!

I've just found much cooler and more consistent running using the stock airbox. It still heats intake fast on the big tunes, but is a bunch cooler than the WAI. I'm not going to be calling it a CAI anymore, because its not a cold air intake.

 

[chaleurphantom]

I have the conical shaped CAI where the air is forced into front of it. Works great and was good for 5hp on dyno. Intake temps same as stock for me. Wont mention name but initials are A.K. whom I bought it from!

I have the same.

Its a KOLENKO.

I also removed the duct work under the hood for the stock air intake. I have the goggle bag that I like. With the duct work removed, the under hood hot air can escape. There are vents under the cowlings on either side of the goggle bag. Normally air intake when stock.

 

[bleedyamaha]

Knapp good info you have here. I haven’t ran my “WAI” yet so I don’t have any input. I really would like to know how many members are running this intake and how many switched back.

 

[74Nitro]

The 18 XTX I had came with the plastic screen, no bag. I noticed a lot of heat rises out of here. The 19 LT-X came with bag, no screen. I ordered the screen as I like to keep this area vented.

 

[KnappAttack]

I have the same.

Its a KOLENKO.

I also removed the duct work under the hood for the stock air intake. I have the goggle bag that I like. With the duct work removed, the under hood hot air can escape. There are vents under the cowlings on either side of the goggle bag. Normally air intake when stock.

I also run without the duct work when using the WAI and no goggle bag. Does nothing to lower the temps under the hood. Nothing at all. Put a thermometer up at the filter and you'd be amazed at the hot temps going into the WAI filter!

Knapp good info you have here. I haven’t ran my “WAI” yet so I don’t have any input. I really would like to know how many members are running this intake and how many switched back.

I'd guess not many, I don't think people pay any attention to intake or under hood temps, let alone actual clutch and belt temps. They just bolt it on and go. The thing is the WAI does increase boost and require a bit more clutch weight, so essentially it does make more power, until the intake gets hot and then the power falls off. It shows in the leaner AF ratios that it flows better. Better yet is stick it outside the hood, but then watch the AF ratio go real lean! Again, most guys have no idea on what their actual AF ratio is. Not many running the AF module.

 

[Mototown]

I just ran the sled with cai , start of run 50f ran about a mile went up to 96 f . Took off side panel for clutch’s started off a little better , but after to back to back runs air temp was at 96 with no panel. Don’t think it’s intake problem . Don’t think the inter cooler is big enough.

 

[Mototown]

Where does it read temp from? The tube at airflilter only ?

 

[KnappAttack]

I just ran the sled with cai , start of run 50f ran about a mile went up to 96 f . Took off side panel for clutch’s started off a little better , but after to back to back runs air temp was at 96 with no panel. Don’t think it’s intake problem . Don’t think the inter cooler is big enough.

True, the intercooler is not big enough, neither is the tiny stock turbo. The little turbo is beating and heating up the air pretty bad with big tunes.
You would see lower intake temps just running around at slower cruising speeds before starting your tests also. The intake takes some time to get cooled down after sitting, or from a hard run.

Basically the 998 is not engineered properly for anything over stock 205HP setup. The bigger the tune and the quicker the spooling down low, the more heat it will make faster, and the more heat it makes faster, the quicker it will pull power as the intake heats up pulling timing and adding fuel. So whatever you can do to start a run at a lower intake temp, the better off you are and the longer it will go before pulling power away. Kind of a catch 22, we want hard hitting quick spooling tunes, but they make heat quicker and faster too, which will limit power when the intake gets hot. Cooler intake temps also suppress detonation. Hot intake temps promote detonation.

It's one reason I would like to add the Hurricane secondary intercooler, but you also have to cool that intercooler with cool air to it. So going to be critical to find a way to get good airflow to it. Even the stock intercooler needs better airflow, even though its out front of the machine where you think it'd be really good, its really limited with moving the air from the backside of it promoting good cooling flow.

Where does it read temp from? The tube at airflilter only ?

Intake temp is read from the back of the plenum, right before entering the throttle bodies.

 

[Mototown]

Just put on my stock intake , intake temps were 10-15 f colder cruising, & cooled down much quicker after long run...temp went up to83f after long pull. does anyone want to buy a CAI , lol it won’t be going back on

 

[74Nitro]

I've watched some youtube videos with external intakes. Are they all this noisy, or have they vented the blow off valve somewhere else besides the intake tube? I wouldn't mind the external intake, just don't want too much turbo noise if I'm trail riding all day.

 

[KnappAttack]

Just put on my stock intake , intake temps were 10-15 f colder cruising, & cooled down much quicker after long run...temp went up to83f after long pull. does anyone want to buy a CAI , lol it won’t be going back on

Now you see what I’m talking about.

I've watched some youtube videos with external intakes. Are they all this noisy, or have they vented the blow off valve somewhere else besides the intake tube? I wouldn't mind the external intake, just don't want too much turbo noise if I'm trail riding all day.

I went very lean with it outside the hood last year. Have a AF module or gauge to verify?

 

[Doug Heald]

Is there a different filter you can put in stock air box that would let more air thru then the foam filter. I would always clean out the milky yellow moisture in the tube after the air filter. And wash and dry the foam filter!

 

[Mototown]

Don't believe the air filter would be a big restriction. Yamaha has a lot experience with air filters on motocross bikes . Do you still have the roll over valve hooked up to the intake . That's is where the milky yellow moisture is coming from .