View Poll Results: Do you run a K&N air filter?
Yes
30
48.39%
No
32
51.61%
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Air box removal
Thread Starter
Senior Member
Back Marker
Joined: Nov 2006
Posts: 212
From: MA
Air box removal
I have been searching around for an airbox removal kit for my 99 superhawk and have not been able to find anything. Has anyone done this be for? I got D&D pipes on my bike with stock air filter and stock jets... (i think) I know im going to do a jet kit this winter, and i would like to pull the air box out, jet it and run some K&N cone air filers.
ole dirty bastard
SuperSport
Joined: Jul 2004
Posts: 976
From: my house
if i remeber correctly jets are 175/178.
i may be wrong not sure.
i used a dynojet kit stock filter and debaffled stock pipes.
now im working on a custom exhaust, and will have to do it all over again!
i may be wrong not sure.
i used a dynojet kit stock filter and debaffled stock pipes.
now im working on a custom exhaust, and will have to do it all over again!
Administrator
World Champion
Joined: Dec 2004
Posts: 105,287
From: Fulton, MO
You really don't want to get rid of the airbox. You won't be able to tune it correctly.....ever. These carbs are really sensitive to intake air pressures and even so much as removing the rubber intake snorkel will cause you havoc on windy days due to changes in pressure. Folks even have problems tuning for aftermarket filters. Trust us. Mess with exhaust and jetting, but not the intake.
Senior Member
SuperBike
Joined: Nov 2005
Posts: 1,011
You really don't want to get rid of the airbox. You won't be able to tune it correctly.....ever. These carbs are really sensitive to intake air pressures and even so much as removing the rubber intake snorkel will cause you havoc on windy days due to changes in pressure. Folks even have problems tuning for aftermarket filters. Trust us. Mess with exhaust and jetting, but not the intake.
you know I used to think removing the airbox would be a good idea until I had all my tuning nigthmares with the k&N and what not. it's so hard to get this big carbs to run right as is, removing it is just gonna make it worse
Junior Member
Squid
Joined: Apr 2006
Posts: 10
It's easy and the best thing ever to do, i've been running no airbox for quiet some time now, but i do know how to tune and i am also using the HRC jet-kit and a full race system and a few other parts, and i have just gotten a set of keihin fcr flatslide race carbs which are about to go on, and they wont be running an airbox either, or filters for that matter
ole dirty bastard
SuperSport
Joined: Jul 2004
Posts: 976
From: my house
It's easy and the best thing ever to do, i've been running no airbox for quiet some time now, but i do know how to tune and i am also using the HRC jet-kit and a full race system and a few other parts, and i have just gotten a set of keihin fcr flatslide race carbs which are about to go on, and they wont be running an airbox either, or filters for that matter
show us some pics and dyno runs.
Junior Member
Squid
Joined: Apr 2006
Posts: 10
When i get a chance i will definatly put up some pics, and i will never post anything without having done it and tried my *** off to make it work, and as i said im running the HRC jet-kit, which makes a huge difference, i haven't had a chance to get to the dyno with the box off yet, but my last run with it on was only 112rwhp and 78ft/tq, and that was only with 155/158 main jets, and now with the airbox off and no filters i have to run 170/175 main jets, almost back to stock
And i can assure you that i haven't lost any driveability at all with the work i have done, you can ask anyone i ride with and anyone who has ridden the bike
And the cool part, as i said i have a full M4 race system, and you can imagine the noise that makes, well the intake roar is louder than that at high rpm
And i can assure you that i haven't lost any driveability at all with the work i have done, you can ask anyone i ride with and anyone who has ridden the bike
And the cool part, as i said i have a full M4 race system, and you can imagine the noise that makes, well the intake roar is louder than that at high rpm
ole dirty bastard
SuperSport
Joined: Jul 2004
Posts: 976
From: my house
When i get a chance i will definatly put up some pics, and i will never post anything without having done it and tried my *** off to make it work, and as i said im running the HRC jet-kit, which makes a huge difference, i haven't had a chance to get to the dyno with the box off yet, but my last run with it on was only 112rwhp and 78ft/tq, and that was only with 155/158 main jets, and now with the airbox off and no filters i have to run 170/175 main jets, almost back to stock
And i can assure you that i haven't lost any driveability at all with the work i have done, you can ask anyone i ride with and anyone who has ridden the bike
And the cool part, as i said i have a full M4 race system, and you can imagine that noise, well the intake roar is loader than that
And i can assure you that i haven't lost any driveability at all with the work i have done, you can ask anyone i ride with and anyone who has ridden the bike
And the cool part, as i said i have a full M4 race system, and you can imagine that noise, well the intake roar is loader than that
Junior Member
Squid
Joined: Apr 2006
Posts: 10
Nope no filters what so ever, and i havent run any type of filter for some time now, even when i did have an airbox i ran it without a filter, cause thats the way the HRC kit is designed to run, i had heaps of problems trying to run a filter with the box on and HRC kit, and tried a K&N and unifilter, but when i followed the instructions and took it out altogether it ran grat and was heaps eaiser to tune, but thats one of the advantages of using HRC parts
Senior Member
SuperSport
Joined: Dec 2005
Posts: 963
From: Sunshine Coast, Australia
I realise you guys don't know Nakedchef as he has only put up 5 posts. But he lives in Brisbane as I do, and is a friend of mine. I can assure you he is quite serious.
Maybe a bit of a nutter, but still quite serious! LOL
Maybe a bit of a nutter, but still quite serious! LOL
ole dirty bastard
SuperSport
Joined: Jul 2004
Posts: 976
From: my house
dont have that much disposable income.
but how much power is he making would be interesting
to see.
btw mine made 108.5 right at limiter.
Senior Member
SuperSport
Joined: Dec 2005
Posts: 963
From: Sunshine Coast, Australia
I agree, it's filters for me too, no doubt. I am not that keen for extra horsepower.
It will be interesting to see how the engine goes when he is finished. I have concerns about the flat slides, and how easy the bike will be to ride with them. We shall see I guess!
It will be interesting to see how the engine goes when he is finished. I have concerns about the flat slides, and how easy the bike will be to ride with them. We shall see I guess!
Thread Starter
Senior Member
Back Marker
Joined: Nov 2006
Posts: 212
From: MA
air box removal
Nope no filters what so ever, and i havent run any type of filter for some time now, even when i did have an airbox i ran it without a filter, cause thats the way the HRC kit is designed to run, i had heaps of problems trying to run a filter with the box on and HRC kit, and tried a K&N and unifilter, but when i followed the instructions and took it out altogether it ran grat and was heaps eaiser to tune, but thats one of the advantages of using HRC parts
Senior Member
SuperSport
Joined: Dec 2005
Posts: 963
From: Sunshine Coast, Australia
I spoke to him about this only last week, and he is still fine tuning the FCR's when time permits, as the adjustment they have is huge, but is VERY happy with them. He reckons they are fantastic. I thought it would be hard to ride on the street, but he reckons they are very smooth.
Senior Member
SuperBike
Joined: Aug 2005
Posts: 1,864
From: Fort Wayne, IN
Interesting. I too would like to see some details including pictures. Carb options are something that people don't normally even consider because, well, there are no options. If you could choose to have a choice or not to have a choice you'd choose to have a choice, right?
Senior Member
SuperSport
Joined: Dec 2005
Posts: 963
From: Sunshine Coast, Australia
In Japan the FCR conversion is pretty common, and you can buy the set up of Japanese ebay to bolt straight on the VTR. I have not seen it yet, but Nakedchef tells me that it is a good swap, and he got everything he needed. One big difference is the tuning options of the FCR, you can change just about everything on them! It's amazing the differnece between them and the stockers.
I thought that it would make the bike hard to ride with flat slides, but he reckons they are great on the street, and pull well from low revs and stuff like that. He is very impressed with them.
Another benefit I reckon would be getting rid of the problems we have with airfilters and airbox mods with the stock carbs. Without vaccuum slided to worry about I reckon you could improve the intake a lot.
May have to look into doing it myself, or go to injection, but the carbs would be cheaper. It is hard to get stuff from Japan though I have been told, you need to know how to go about it, and I don't!
I thought that it would make the bike hard to ride with flat slides, but he reckons they are great on the street, and pull well from low revs and stuff like that. He is very impressed with them.
Another benefit I reckon would be getting rid of the problems we have with airfilters and airbox mods with the stock carbs. Without vaccuum slided to worry about I reckon you could improve the intake a lot.
May have to look into doing it myself, or go to injection, but the carbs would be cheaper. It is hard to get stuff from Japan though I have been told, you need to know how to go about it, and I don't!
Senior Member
MotoGP
Joined: Sep 2006
Posts: 4,138
From: Austin, Tx
I was waiting as well. I am very interested in the induction side of the Superhawk engine. I'm not saying that the work done on cams/porting/HC pistons is a waste of time, I just think that there's more horses to be gained for less money on the top end. Just my .02
Junior Member
Squid
Joined: Apr 2006
Posts: 10
Hey guys sorry it's been so long, i don't get on the net as much as i would like, but here you go, pics can be found here, and when i get a chance ill bee back to the dyno http://mootavic.olilolo.com/
