Hi All

As the title, who has done it? I saw the CBR954 injector has 12 holes, but CBR929 has only 4 holes...

I think it would be better if swap the 954 injection system to CBR929!

Anyone knows!!!!!!!!!!!:eyebrows:

I ran 954 throttle bodies and injectors on my 929 with no problems at all.

 

Thanks man..

I will install on it..but I checked what's different...I might need fuel injection system wire...that's different..

What else do I need to take care???

 

Let´s get tech.

First of all the amount of openings in an injector is second to what the injector spray looks like and how the engine will handle the emulsion of what the injectors deliver.
Ergo,there is no such thing as stating that a 12 hole injector will work better than a 4 hole.

I at the time assisted close friend Jörgen Karlsson in developing this;
http://www.vems.hu/wiki/index.php?page=MembersPage/MattiasSandgren/MrideCarForTwo/FuelInjectionhttp://www.vems.hu/
and altho i wont tout the advantages of e programable EFI i in short state that it has its merits as it can be individualy tailored to a specific engine or driver.

To expect guaranteed improvements from using a different EFI for a given bike...is being carless. It simply doesn´t work that way.

 

Let´s get tech.

First of all the amount of openings in an injector is second to what the injector spray looks like and how the engine will handle the emulsion of what the injectors deliver.
Ergo,there is no such thing as stating that a 12 hole injector will work better than a 4 hole.

I at the time assisted close friend Jörgen Karlsson in developing this;
Vems.hu
and altho i wont tout the advantages of e programable EFI i in short state that it has its merits as it can be individualy tailored to a specific engine or driver.

To expect guaranteed improvements from using a different EFI for a given bike...is being carless. It simply doesn´t work that way.

The big advantage of the 954 throttle bodies is they're 2mm larger bore.
You can use the 929 injectors in them if you wanted to but I can't see any reason to.

 

Hi all.I have just got hold of a set of 954 injectors ,when fitting to 929 did you use the 954 airbox ?? Cheers.

 

Do you mean you are swapping throttle bodies or just the injectors?
No, as far as I know the 954 airbox won't fit under the 929 tank - but I haven't tried it myself.

 

Was going to swap bodies complete,So do you just modify original airbox and get 954 trumpets??

 

Modify the airbox in what way?
You don't need the 954 stacks.

 

so does the 929 airbox bolt up to the 954 bodies the same,and surely the trumpets on the 929 wont fit the 954 bodies??ps cheers for replies

 

The 929 and 954 throttle bodies are essentially the same casting with bigger holes bored through them. All I did was swap the throttle bodies/injectors and the injection harness - nothing else.

 

so what trumpets did you use??

 

I don't know if you are referring to the airbox intakes or the velocity stacks but I used the stock 929 items in both cases.

 

ok thanks for help(it was velocity stacks i was referring to)

 

I can see this thread is quite old, but when I swapped my ITB's over from 929 to 954, I used the 954 velocity stacks with the 929 airbox. It didn't make sense to me to install larger throttle bodies and use a velocity stack that is roughly 2mm smaller at the body inlet. I initially attempted to fit the 954 airbox to the 929 and it was a no go. The top of the 954 lid has a lot taller hump in it which prevents the fuel tank from sitting how it should.
I also got busy with a dremel and cut larger openings in the airbox for my 929. After comparing the size difference of the intake (ram air tubes) that are crazy bent like a Z, it was very obvious the 954 openings were considerably larger as was the airbox lid for the 954.
My most recent addition was a hindle header with a custom 2" header back exhaust to a short meg muffler followed by a dynojet wideband commander. To my surprise, even running the hindle full exhaust program, the bike runs very very rich. It was reading AFR's of 12:1. I've since defueled the bike across the board and i'm now closer to 13.5:1.

 

I am considering doing this mod to my racebike.
Being an endurance bike, fuel economy is very important, so I have even left gearing stock. We can race up to 90 minutes on one tank of fuel. Not looking to loose any economy.
Main reason I want to do this is for traction control, fuel and timing control via Bazzazz. They don't make a kit for a 929 but they do for a 954. I am hoping that if I did throttle bodies, injectors, and injector harness, that I could use the Bazzazz for ign timing, fuel trim, quickshifter, and traction control on the 929. Any thoughts?

 

How on earth do you get ninety minutes out of the tank under race conditions? My 929 used to get less than 8kpl on the track before I put the 954 TB's on, but I haven't checked it since then as fuel economy isn't particularly important. At that rate though I'd be really struggling to get sixty minutes out of a full tank. You're almost getting the same fuel economy that I get around town, which is obviously at _much_ lower speeds and never at full throttle.
If fuel economy is important I wouldn't be increasing the size of the TB's.
How long are the races and how much fuel are you using currently?

 

Our races have all been 3 hr races.
Track depending, we have made 178 laps on short config, to 112 laps on long track in heavy rain.
We aim for 1 hr between pit stops/rider change. We typically put 11-12 litres in at that time. However, there have been a couple instances of rider needing to come off early, and rather than risk an extra pitstop, we just leave the next rider out longer, usually me, till the end of the racer as I always ride cleanup. One weekend we were short one rider, so we got a young 14 yr old up and coming phenom to ride with us. He is a couple seconds/lap faster than we are, but he crashes at least once a wknd. We had to give him a talking to explaining that to win, we need to stay on the bike. After he was on the bike for 38 mins, he ran off tha crousel at 100+ mph, and **** his pants. He didn't fall, just did some farming. He scared himself and came in a lap later, so I was out for 90+ mins till races end. That time was the only time we have ever seen the fuel light during a race. Our bike is bone stock except a slipon and Ohlins shock, but on the back straight I can almost stay in the draft of a new GSXR1000 in the GTO class, and can sometimes power past the 01 GSXR1000 in that class as well. Next yr they can run that 01 GSXR against us:

GTO- any supersport bike 600cc and up, less than 12 yrs old.
GTU- any 650 twin or below, or any Lost Era or vintage bike 12+ yrs old
GTL- Ninja 250 and below
...they are talking about opening a GTV class for bikes over 20 yrs old.

 

Sounds like you're having a ton of fun
How fast is that straight?
But it doesn't sound like fuel economy is actually that important since you only need the full tank capacity under unforseen circumstances. I wouldn't worry about the fuel economy at all since the racing seems to open up quite a lot (several laps between riders for example) and a "splash and go" wouldn't eat up that kind of margin. I would certainly expect you can make up more time than that with good bike modifications. I definately wouldn't restrict yourself on fuel usage on the outside chance you'll need the extra in case of a crash.
Are you allowed to replace the TB's in your class - particular with those from a later model than the 12-year cut-off?
I'm not a fan of refueling bikes while the rider is still onboard though, saw a race bike go up in flames once when the fuel vapour ignited from the heat.

 

In long config, we have two straights...The longer of the two is just over 1/4 mile and I see 142-145 mph on the gauges before braking on the 929...the R6 has speedo covered so no idea.
The next order of business for mods is going to be aftermarket clipons (must be at least as high as stock or adjustable as comfort is important on this bike), braking, and fork internals to match the Ohlins shock out back.
As I said, the main reason I was looking for info on 954 throttle bodies isn't for power gains, but for the ability to interface with a tuning box that has traction control and quickshifter built in. Bazzazz doesn't make one with 929 style connectors, but they do with 954 ones. I would like to get the whole Bazaazz setup...fuel, igntion, quickshift, and traction control.
I wonder if it would be possible to tune the fuel for economy better than than stock at part throttle settings, like infield, and on short track config where the bigger bikes are never able to stretch their legs, and then map it for power above 80% throttle opening or something like that? I am certainly no good at tuning or any of that...I just ride the damn thing,lol.

As for fuelling during an endurance race, the officials come and watch every team's pitstop.
If you are using lawnmower style gascans, the bike must also have a ground strap to steel on the ground, like a pair of booster cables or something, and the bike must be on a stand, motor off, rider off. If the team has a dry break quick fill setup, no stand or ground strap is needed, but again, motor off, rider off. Any variances from this is immediate DQ.
As far as throttle body replacement, I asked the series owner, and he just laughed...said do whatever you want to the bike, so long as stock frame, engine block, swingarm, and fork tubes are used. No nitrous or turbo,LOL.

 

Hi blade racer.
A friend of mine has a 929 and he is thinking about the 954 throttle bodies.
Can we just swap throttle bodies and leave the injectors alone.
He is concerned about messing with the loom.
Thankyou.

 

Post number 5 :thumb:

 

Just done this mod and am so far pleased with the results although I've not had an opportunity to give it a long run out and a thrash round the track so will reserve full judgement until I can.

My bike is a 929 with standard airbox including working flapper, HTEV fitted and working, K&N filter, ART can and PCIII (PowerCommander from a 954, on which I have loaded a 954 base map with my 929 data (from a dyno run) in the relevant positions in the table).

I swapped out the 929 throttle bodies for ones from a 954, I also fitted the 954 velocity stacks and retained the 929 airbox.

As I say, I'm pleased with the results, sounds much throatier and seems to pull stronger at low revs and definitely has more power at the top end. I made a schoolboy error though by cleaning the air filter at the same time, so some of the performance gain could be down to that. Or, it could just be psychological horsepower

A very straightforward modification, which apparently gives instant gains, not bad for £60.