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Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

Thread: Cutting down velocity stacks? Reply to Thread
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  Topic Review (Newest First)
10-07-2008 1:08 AM
bladeracer
Re: Cutting down velocity stacks?

Quote:
Originally Posted by DingDongGo View Post
How much would a reasonable set cost me? ballpark figure
I paid US$89 from Cycle Works in Vancouver back in April.
US$141 including freighting them to me in Perth.
10-06-2008 6:38 PM
Deadsmiley
Re: Cutting down velocity stacks?

Quote:
Originally Posted by Tony929 View Post
Found one on ebay waiting on a post quote...

i dont know how to post a link though
Just copy the full link into the editor window. The forum software is smart enough to make a nice link for you.
10-06-2008 6:20 PM
Tony929
Re: Cutting down velocity stacks?

Quote:
Originally Posted by DingDongGo View Post
Tony929 if you find one soon let me know how it goes.
Found one on ebay waiting on a post quote...

i dont know how to post a link though
10-06-2008 6:10 PM
Deadsmiley
Re: Cutting down velocity stacks?

Quote:
Originally Posted by DingDongGo View Post
That seems like a great idea I believe I am about to look for 954 throttle bodies and the harness
Nashville seems to have tons of motorcycles. Give this guy a call. He is parting out a stunt bike.

honda cbr 954

And... there is always Ebay.

The second one looks more complete. (maybe)
eBay Motors: HONDA CBR 929 954 INTAKE THROTTLE BODIES BODY COMPLETE (item 170267836273 end time Oct-29-08 18:36:14 PDT)

eBay Motors: Honda CBR 954 01 02 Throttle Body (item 220287929517 end time Oct-06-08 19:43:52 PDT)
10-06-2008 5:48 PM
DingDongGo
Re: Cutting down velocity stacks?

Tony929 if you find one soon let me know how it goes.
10-06-2008 5:43 PM
Tony929
Re: Cutting down velocity stacks?

Quote:
Originally Posted by DingDongGo View Post
That seems like a great idea I believe I am about to look for 954 throttle bodies and the harness
10-06-2008 5:41 PM
DingDongGo
Re: Cutting down velocity stacks?

How much would a reasonable set cost me? ballpark figure
10-06-2008 5:31 PM
bladeracer
Re: Cutting down velocity stacks?

If for some reason you can't get the harness with them it's about $50 new from honda or you could probably use the injectors from the 929 bodies.
10-06-2008 5:26 PM
DingDongGo
Re: Cutting down velocity stacks?

That seems like a great idea I believe I am about to look for 954 throttle bodies and the harness
10-06-2008 2:29 PM
bladeracer
Re: Cutting down velocity stacks?

Quote:
Originally Posted by babisgr View Post
very interesting.You havent even loaded a 954 map on pc and it works good.I bet you will have a real boost when mapped.
You still kept the 929 stacks and box?Even the connectors were identical?
The injectors are different so you need the 954 injector harness with the throttle bodies but it's the same connector into the harness.
The venturi's are tapered in and out so only the centre of the throttle body is 42mm. The out tract into the head is the same size as the 929 as are the manifolds and the ports so the 42's slot straight in.
The manifold clamp screws are a real mongrel to get to so make sure you're in a good mood when you put them on and take your time :-)
10-06-2008 1:33 PM
babisgr
Re: Cutting down velocity stacks?

hm....so what if 2 where shorter and 2 where longer?dont know in what sequence but couldnt that be beneficial?
I guess if it was,honda would have thought it first!
10-06-2008 11:06 AM
nedro
Re: Cutting down velocity stacks?

Quote:
Originally Posted by babisgr View Post
hey if it really helps (i doubt though) you could easily cut a piece in the midle and just glue the top with a good epoxy or something.
Nope, won't work. The bore venturi would not act smoothly and would create turbulance.
Also, what is it you want to improve?
If you lengthen the stacks it would work better at low RPMs. A shorter stack for higher RPMs.
10-06-2008 9:50 AM
babisgr
Re: Cutting down velocity stacks?

very interesting.You havent even loaded a 954 map on pc and it works good.I bet you will have a real boost when mapped.
You still kept the 929 stacks and box?Even the connectors were identical?
10-06-2008 9:45 AM
bladeracer
Re: Cutting down velocity stacks?

I was impressed but I haven't mapped to suit them yet.
I really expected to spend a day just getting them to work but I simply screwed them on and fired it up and it pulled hard straight away.
As with anything that boosts topend I'd expect to see some midrange losses but I haven't noticed anything missing yet. It's also possible that the improved intake is also complimenting the improved exhaust due to the full Akrapovic system so it's possible the gains won't be as noticeable with a stock exhaust system but I haven't had the stock system on it since I fitted the bigger throttle bodies.
Transition from closed throttle is still a bit messy but that's really only noticable when racing in the rain. I doubt it'll be a problem once I get over this damned flu (I've missed the last three race days!) and can map it properly.
10-06-2008 9:38 AM
babisgr
Re: Cutting down velocity stacks?

will the 954 throtles be a direct bolt on?i understand they will require mapping.Do they offer real performnce increase?
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