Project 2v SBK 4/1/10 update

[1KDS]

you should use that extra R motor money for headwork and a big bore

120hp 2v 

[jwoconnor]

How do flat-slides get almost 20% more power out of the DS1000 motor? Are the stock throttle-bodies too small? This seems to be opposed to everything I've ever read. I'm open to learning more and I'm certainly not stuck on EFI, carbs are definitely easier to work on on the side of the road.

[Travman]

It is a good question.  My DS1000 made 86 hp on the dyno.  It had termi mufflers, PCIII and pod filters.  To jump up to 100 hp is a pretty big jump.  I guess we'll see in time when Theo or others dyno their bikes after installing the FCRs.

[junior varsity]

One of the issues with the pod filters is, this is a bit of a pro/con.

Pros:
High flow
Low Clutter
Allows more air to hit vertical cylinder, leading to cooler running vertical cylinder, which (beyond reliability pluses) may lead to a more efficient vertical cylinder.

Cons:
Low volume of still air. Big bore ducs inhale tons of air with each intake stroke (492cc's each intake stroke on the 900). Large airboxes allow for lots of still-air for each intake stroke. Some of the tuner websites proclaim a min vol (for max power) of at least 1.5x volume.

Beyond the pods, (going to a large airbox for more available air at each intake stroke) I'm not sure of other intake related changes that would get you more air. Perhaps the FCRs flow more fuel than the stock injectors can put out.

When you go to FCRs, what do you do about fuel pump? I know that some guys have been going to electric fuel pumps (running around 2 psi) for the carb bikes when their vacuum pump quits. Looks like it would be as simple as plugging it into a switched circuit.

[TAftonomos]

For reasons I can't explain, lots of people have posted gains by getting rid of the airbox on 2v bikes and going to pods.  There are a few places that make kits for this (ducshop, WASP, TPO, etc) and plenty of reviews online to check dyno graphs.

The 4v bikes do not respond the same way from my understanding.

Also remember, dyno to dyno comparisons mean very little.  It's runs on the same dyno that count (or 1/4 mile MPH speeds for another way to measure HP)

[junior varsity]

Its interesting that its advised on the FI bikes, but the majority of opinions "back in the day" for carbies advised the opposite (though it would make tinkering with carbs far easier). I remember doing searches on the .MS site, and a few others when I was trying to figure out which route to take. Never sure if I did "right", in that I still hate the giant ugly plastic airbox, but won't be changing it until I have a better idea. Perhaps FCR41's, pods, and a custom carbon fiber battery/coil tray is in the works for next winter.

[DucatiTorrey]

This is interesting stuff, but i'm no where near as educated in this stuff as you guys. So I can continue to keep up, can you post a picture example of the "ugly" airbox? ANd explain what an FCR is? thanks

[He Man]

This is interesting stuff, but i'm no where near as educated in this stuff as you guys. So I can continue to keep up, can you post a picture example of the "ugly" airbox? ANd explain what an FCR is? thanks

you have a 696 your design is different and none of this really pertains to you. so get out.  jk

ugly airbox is well the aribox seen through the frame.
FCR= a model of  carburators made by Keihin or something like that.

to my understanding the TPO and pod filters did give you more power, but all the power was top range power because they had more surface area. Where as ato memphis mentioned, less static air meant less low end power.

[junior varsity]

Yes. To both and the high end v. low end with/without the airbox

[kopfjäger]

For reasons I can't explain, lots of people have posted gains by getting rid of the airbox on 2v bikes and going to pods.  There are a few places that make kits for this (ducshop, WASP, TPO,

If you really want to know the + or - of this mod on the 2V. Call Mark at the Ducshop. He will give you real world, on the track no bullshit answer to your question.

[ducpainter]

<snip>
The 4v bikes do not respond the same way from my understanding.

Also remember, dyno to dyno comparisons mean very little.  It's runs on the same dyno that count (or 1/4 mile MPH speeds for another way to measure HP)

That was in fact proven on a dyno.

The 4V bikes like a large still air source.

[supertjeduc]

I dynoed with airbox and with Pods on the same dyno and there was no difference (oke' pods were 0.5 hp lower )

[ducpainter]

I dynoed with airbox and with Pods on the same dyno and there was no difference (oke' pods were 0.5 hp lower )

That difference may have been able to be tuned out though...

or did you try?

[badgalbetty]

999R's are good bikes. Fragile but good.
www.eldrat.com read his racing blog.
He did BGB's tattoos.
Thanks Drat.
BGB

[He Man]

I dynoed with airbox and with Pods on the same dyno and there was no difference (oke' pods were 0.5 hp lower )

how was the line though? You get people comparing 999 to the 848 all day long and how much power the 848 makes, but its felt in a different area of the rev range. Thats what i assume about the pods. I mean hell if you run open udder vs full stock exhaust theres a huge shift in power from downlow grunt around 4,000rpm ish that shifts up to 5,000rpms without the exhaust.