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Discussion Starter · #1 ·
next question,

ive taken all the farings off my zxr750 to streetfighter it,
obviousley this includes the ram air ducting, there is still a gaping whole in the frame for air ot get in, but will takin the rest off harm the bike in any way ???

:skrooz:
 

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Function IS Form
19 Z900, 88 Kat11
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17,434 Posts
Don't build an electric supercharger. Please don't.

Instead, rejet your carbs if there are any running problems (which will be mild at worst). But most of us have gaping air ducts and no problems.
 

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Perpetual Project
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3,695 Posts
I had a problem on my 6R when I didn't run with RAM intake tubes. It would bog out around 90mph and no amount of re-tuning would get it straightened out. I have had to break down and work on a solution for the intakes.

If you have to rejett, just remember that your bike is running rich because its getting too much gas for the reduced amount of air its recieving.
 

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British Bloke in Canada
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2,146 Posts
I dont know about carbed bikes, the ram air system on my gixer 100 makes little or no difernce unless your at really high speeds, i must admit though Im trying to come up with some kind of ram air system, cause, you aint going unless your bulls out huh
 

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May be a cannibal?
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I rode my 6R for about a year without the fairing and ram air tubes. I really didn't notice much difference. The lack of the resonators being hooked up on the intakes did allow for a hellacious cracking intake growl at WOT. My bike is jetted pretty rich as well.
 

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You guys running without ramair.. are they fuel injected bikes? I'm trying to run my thundercat without the ram air tanks (still have the little stumpy ram air intakes on the frame though) and it really doesn't like being above 50mph. Maybe the carbs need to be pressurized somehow because there was a pipe coming from the carbs that connected to the ram air tank?
 

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Function IS Form
19 Z900, 88 Kat11
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17,434 Posts
You have to remember that ram air ducts and airboxes are different. If your airbox is integrated into your ram-air system you WILL have a problem with removing it.

My bike is EFI (busa). The ram air ducts are just two tubes with resonator chambers. The airbox is underneath the gas tank and connected to the ram air tubes via holes in the frame.
 

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Perpetual Project
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The 6R I have is carbed.

The "tube that ran from the carbs to the Ram intakes" was probably your clean air intake. I never completly understood its purpose myself, but I think it does have something to do with preasureizing the carbs. I have mine still operational - just have to make sure spiders keep out of it.
 

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Function IS Form
19 Z900, 88 Kat11
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17,434 Posts
The purpose of a ram-air system is to pressurize the air on the inlet side of the carbs.

Removal of an entire ram-air system is going to have negative effects. Most of us have tubes that go from the frame of the bike to the front of the nose when the bike is stock. Removing these rarely has any ill effects.
 

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The Gear Head
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803 Posts
zedpowa said:
You guys running without ramair.. are they fuel injected bikes? I'm trying to run my thundercat without the ram air tanks (still have the little stumpy ram air intakes on the frame though) and it really doesn't like being above 50mph. Maybe the carbs need to be pressurized somehow because there was a pipe coming from the carbs that connected to the ram air tank?

First of all, ram air starts working after about 160Km/h (100Mph), thats when the air pressure entering the intake exceeds atmospheric pressure. And you start geting "boost".
Now, on Fuel injected bikes there is a Map(manafold absolute pressure) sensor in the airbox, that will then tell the ECM to adjust fuel delivery.
On Cabureted bikes there are a few different designs, but essentially the same idea. The carb float bowl vents get pressurized too. Same as intake air.
So when you remove the ram air on some bikes, you have to change vent back to atmospheric pressure.
My buddy had a F3, that ran like shit after he turned it into a nakid stunt bike. That bike has a dual stage float bowl vent system. One for low speed, below 12Mph, and one after. He had to ged rid of the 2nd system.

Another benefit of ram air is that you get "fresh" air at speeds below 160 Km/h (100Mph). Not heated air from behind the engine or under the tank.
 

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Senior Member
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890 Posts
Ram air Kwakas have a pressure balance pipe that runs from the front end to the carb bowls to equalise the ram air pressure and fuel pressure. When I first modded my ZX9 I left this pipe dangling out the front without the ram air tubes (behind the new mini fairing). The result was the pipe got pressurised and it bogged down due to running too rich. I now run some mini scoops (cut down from the original ram tubes) AND I have routed the carb pressure pipe into the bottom of the airbox (just above the rocker cover). This mimics the original set-up as far as the fuel pressure situation is concerned. Also, you will probably find it running a bit lean as you are taking away a fair amount of air restriction when removing the ram tubing (like a motor will run lean if you remove the air filter). In the end though it was trial and error for me. Hope this helps.
 

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fukstik
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1,154 Posts
there is a huge difference with the combined lack of aerodynamics and the missing ram air tubes on superbeast. on the track it hits a wall at 130mph and doesn't do anything more. then my buddies go round the outside....round the outside.....round the outside. (sorry 'bout that) then i have to make up ground in the corners. when my bro had his TLR at daytona for a track day it topped out at 164 so that does make a huge difference in top end. all of which y'all shouldn't be seeing on the street :nono: :D
 

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British Bloke in Canada
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2,146 Posts
yeah my gixer 1000, goes 160kph plus and it does kind of hit a wall, at that speed, then I have to keep the revs really high to push faster, Ive had the bike to 240 without the ram air, but the wind was kicking my arse.
MY streetfighter and streetfighters in general, are Urban machines and suited to that perfectly. and really thats what I USE IT FOR.
 

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I solved this problem on my 9r about a year ago. didn't find it easy to work out but have a look at this thread
http://www.streetfighters.com.au/forum/topic.asp?TOPIC_ID=1396

it has my prob on there from start to finish it has another link for ram air too.

Hi Hilllsy, you finally got a colour for yor 9r and how is the new h/light working out.
 

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Function IS Form
19 Z900, 88 Kat11
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17,434 Posts
Mine pulls better for freeway passes with my cowls on, but the EFI compensates well enough that it's not a huge problem to live without them.
 
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