How to TB balance

I am still getting use to navagating around this site. I have not found how to balance the throttle bodies yet. Can someone point me in the right direction please?

I am not sure how it is done with Throttle Bodies... but it should be similar to the links done with Carbs:

http://www.advrider.com/forums/showthread.php?t=568920

http://www.advrider.com/forums/showpost.php?p=17904434&postcount=10

Not sure either how it works on the fuel injected bikes but here is a penny tech solution on car syncing on a carbed LC8

/Johan

Here is a link to the TBS on a 990 SuperDuke:

http://www.superduke.net/forum/viewtopic.php?t=5347&start=0&postdays=0&postorder=asc&highlight=

by lockers » Sat Jun 21, 2008 1:20 am
I use the vaccum hoses that connect to the IAP (intake air pressure) sensors. Theres one on the frame beside the left side of the airbox and one just behind the radiator filler cap on the right. It's just small sensor with one thin hose and elec plug connecting to it, mounted in a rubber holder. Just pull the hose off, stick a joiner in the end of the existing hose and then connect the carbtune hose to that. You must disconnect the Elec plug too, or it will stall when running. You will have an FI light to come on too, due the the disconnected IAP sensors but don't worry about that.

The adjustment/balance screw is inside the airbox, on the left side of the rear throttle body. You need to raise the tank/remove the air filter to get to it. Then just tweak it until she's running sweet and re-assemble.

I do mine every minor service.

So sorry I meant carb balance. I am so use to talking about throttle bodies (FI) !

Thanks for all the links etc.
Cheers.

To sync the throttle bodies on FI 990's is it best to mechanically adjust the TB screw or make the adjustment thru software (TuneECU)?

I use one of these:


Couldn't be easier... stick it in one.. stick it in the other.. make sure the reading is the same.
if it isn't adjust the screw (mentioned above) until they match.

You are basically measuring the actual air consumed.

Hope this helps

In my CBR F3 and F4i, which is Fi, I do it the grandpa way and as never failed me.

A piece of wood with 1m x 15 cm with 4 fishtank silicone hoses plugged together on the bottom with some small T´s and filled with regular car/bike oil.

Just plug the other end of the hoses to the TBs and adjust. Just like with a Carbtune only waaaaaaaaaaaaaay cheaper

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double post

Reviving this old(er) thread, I'm curious if anyone has actually sync'd the throttle bodies on an FI bike? I was reading electronic shop manual last night and it states that the throttle bodies should never be adjusted? :eek1

I picked up the synchrometer posted above, in hopes of checking/adjusting this weekend but I'd rather not get in there and hose up the TB's if they are really not meant to be adjusted. Thanks.

Use tuneecu for the reading and just adjust the screw on the rear left side of the TBs.
Some bikes are off and it's worth looking into.
My 2 cents

I've read reports that tuneecu, although a great resource, was not appropriate for syncing the TB's. I'm just curious if anyone has actually done this and what the results were.

I've used tuneecu but more recently a home made manometer (do a google search if interested - no need for a fancy vacuum gauge set on a twin)

Tuneecu got it pretty close but the values fluctuate so its hard to judge when they're averaging the same. I hooked up the manometer, (basically a tube with oil in it) to the tb vacuum ports and needed to make a slight adjustment, so I'd say that is more accurate.

I've removed the canister air pump and replaced with test leads, so the tb sync is easy to hook up, but if I hadn't done so I'd definitely get one of the gauges Geek suggests. It would be a ton of work to mess with vacuum hoses just to tb sync

KTM does it with a digital tuning gizmo.
I have done a few 990s with tuneecu and I don't find the fluctuation to be more than a few hpa. Usually, + or - 2/3 hpa.
I've also swapped around the MAP sensors to confirm readings.

I've adjusted them at 2000 rpm and then let the bike idle to see what the spread is. It's usually very close.

So, perhaps, tuneecu isn't perfect but the bikes were running pretty good afterwards. Just an opinion.

Thanks for the advice guys. Since I already had the meter I decided to use that in conjunction with tuneECU to see what differences there are. The Tuneecu screen did fluctuate a bit, making it a little difficult to get a good average.

I could see from the meter that my intakes were off from one another by about 1.5 kg/hr to start.

Also the tuning screw is very touchy, so it took a while to figure out I could put one finger under it and turn the screw at the same time to help stop the readings from going all over the place. In the end, the flow meter was much easier to use than tuneECU, but it was nice to reference both just in case.



I ended up with both intakes settling at 7 kg/hr. Also, if anyone has the smaller trumpets from the RC8 like I do, you'd need to put in the originals to use the meter (or use/make an adapter). Otherwise this worked flawlessly.

I took a small loop into the hills afterwards to test everything, and so far, my throttle response at low RPM has been smoothed out considerably. I'm happy I decided to get this done.

Today I used my new carbtune device to balance my throttle bodies while running Tune ECU as described in this thread. They were out a bit and it was easy to adjust. My 2007 LC8 is sounding amazing. Thanks guys for sharing your wisdom on this forum.

Great thread

What size of adapter did you use with the device for katoom air intakes ?

I think I had the base adapter that came with the device. Fits just perfect

Small end diameter 40mm
Large end diameter 55mm
Length of cone 36mm