Yamaha R1 Forum: YZF-R1 Forums banner

V Stacks for daily driver?

1.8K views 27 replies 10 participants last post by  martinc  
#1 · (Edited)
I am thinking of getting V stacks for the up & coming 2002 R1 this summer. I plan on pulling the emissions and putting a Micron can on (re-mapping w/ stock ecu).
My question is this, does anyone see a problem with this mod, as in can water easily get in there. I plan on putting a screen (actually made from panty hose, yea I know it sounds dumb but it filters really well). So that should keep dirt/dust and whatnot out, but I am a little concerned about water (as I live in WA).
Also any other problems you guys see w/ this?

Thanks,
SuperchargedRS

**Oh yea, when I dyno this thing, I was thinking that if I could get the exhaust from each header (as in from where the AIS system holes are), I could better tune each throttle body, any ideas on this?
 
#2 ·
Pantyhose on what,the vstacks throats?

If so,no way man....I dont even want to see or think what nylons can do in a valve or combustion chamber!

I run an open ramair box,and never had problems with water (and GOD knows I ran into some royal downpours for hours at a time).
 
#8 ·
I believe the airbox creates pressure. If martinc isn't backing it (he seems to know his biz), and it isn't a common mod here on the forum, I would be suspect. On paper might sound good but.... the v stacks should work cool. Panty are for executive chicks and doods who lurk in West Hollywood.....
 
#10 · (Edited)
I have done the pantyhose thing before (with the flow you get through those it's not a problem), with larger engines w/ very good results (350 supercharged LS1). So aside from the filter debate why would I have a problem with this mod??
Thanks

*Also obviously the 2002 has throttle bodies not a carb.
 
#11 ·
Something I'm surprised nobody ahs mentioned is the fact that the airbox helps keep the intake air COOL! If you remove the airbox completely you'll get all sorts of hot air coming straight up from the motor. This does not make power. It just makes noise.

Ask anyone who has riced out a Honda Civic... oh nevermind, they think loud = fast.. my bad :2bitchsla
 
#16 ·
I don't get what the point of it all is. If you want more intake air just fab up a ram air setup (or you could just go buy one). If you're looking for more power, butchering the airbox isn't where you need to start looking. Believe it or not the airbox (unlike an old KZ1000 or something) isn't just a big bucket that holds air. It's tuned to a certain extent to maximize the engine characteristics. If you do some thorough searching, you'll find some people that have taken A LOT of R&D time to retune the airbox to better suit the motor (the free Ivan's mod comes to mind).

The first thing you're going to do is completely screw up your mapping (custom map is in order). I'm not 100% familiar with how the EFI on the R1 gets its a/f info, but I'm pretty sure it doesn't have an 02 sensor. This means that it HAS to have a map or Intake temp sensor in the airbox which relies on the air in the airbox to be somewhat consistent in nature (pressure/temperature/etc) to get a decent reading.

The old trick that was once used in the 80's where people would ditch the airbox of their GSXRs and run individual filters on the carbs doesn't apply to these new bikes.
 
#19 ·
jweltch92 said:
Something I'm surprised nobody ahs mentioned is the fact that the airbox helps keep the intake air COOL! If you remove the airbox completely you'll get all sorts of hot air coming straight up from the motor. This does not make power. It just makes noise.

Ask anyone who has riced out a Honda Civic... oh nevermind, they think loud = fast.. my bad :2bitchsla

you mean it isnt a racecar then???

damn...i was so sure i had it right!
bwhahahahahahaha
 
#20 ·
jweltch92 said:
I believe the 02-03's have similar airbox setup as the 98-01's in which the air is drawn in from the gap between the tank and frame. The intake holes of the airbox are on top toward the rear.
Is that why i have the ugly great hole - i thought they'd just left out a panel when building it! :2bitchsla
 
#22 ·
After a night to sleep on it, I've though more about this (for some silly reason I'm intrigued by your intentions). I've got a couple more things to add.

1. In respect to the previously mentioned tuning of the airbox, they have designed a certain amount of volume to it as well as flow characteristics.

2. You mentioned that you would like to be able to use the ports on each exhaust downpipe to separately tune the individual cylinders. I like this idea however unless you can manage to design (or purchase) a standalone ignition/EFI system, this isn't going to happen. I can't think of even a high-dollar car that monitors and adjusts a/f for each cylinder. The Dynojet PCIII and Yosh EMS have an option that allows you to change the mapping between cylinders a small percentage (ie: the inner cylinders usually run a bit hotter than the outers and therefore, on occasion require a bit richer mixture.

3. After going back and reading your messages it appears that you might think the stock airbox needs to be removed or modified to use the V-stacks. As far as I know (I don't use them-my 99 is bone stock in the engine dept) they will fit right under the stock air filter without any problems.
 
#23 ·
With the stock A/F adjustments you can make to the ecu you can change it cylinder to cylinder [there was a post about that]. Also how the hell is this a ricer thing, how do you make that connection?
If the bike gets it's fresh air from the top of the tank then by opening the top of the tank up an leaving the bottom intack how would that not increase cool air flow? I am just looking to free up some power on this thing w/o getting screwed out of 300 bucks for a AM part that isnt even worth 70bucks
 
#24 ·
Air flow on pre 04's comes from air aperture near the radiator. The volume and vacuum effect consume the air based on the throttle. Freeing up power is a relative thing with these bikes. Given the resource of knowledge specific to these bikes on this forum, you might want to be more specific about what power improvement you want (low or high), because from gearing options, stacks, full exhaust, each one contributes to improvements and in some cases compromises in other parts of the power curve. Lastly the design with the airbox, as well as most of these bikes are really optimized. A stock R1 took 11 place in the last SuperBike race.... that says something about how good out of the box these powerplants are. Generally, cars are not like this, even factory mod'd ones, which based on your car work you would probably agree. Stacks will give you 3-5 hp above 7000, which has been confirmed by more then a few. The mod you are considering is something that is kind of a new concept. As I said before, try it... Let us know. Could work or maybe not. Each mod has its direct impact and as I said before (possible) compromise in other areas.

I believe a gearing change- 520 kit - slip on with exup (keep the killer low end {if pre 04)- drop some unsprung weight and your bike will go from good to really good. IMO
 
#25 ·
Ok,let me sum it up quickly;

Today"s bikes NEEDS an airbox of some kind;

If you remove the top,you may be able to get it close to working,but you"ll most probably loose HP while using A LOT more fuel.

You can indeed adjust the mixture somewhat with the ECU and the cluster"s buttons,but only to a point...

Bottom line,there is no cheap and free ways to get more HP from today"s bikes.