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post #1 of 47 (permalink) Old 03-08-2009, 03:00 AM Thread Starter
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TB Balance pix (1)

First of a 2 part series due to 4 photo limit:

I had previously been asked for pictures of a TB balance setup.

I decided to do something more enjoyable after changing all the gear oil in Wifey's 4-Runner.
I had a new camera and a set of plugs so...

First up, Plugs! Nothing too special here. These are 0.4mm Denso Iridium. I marked the direction the ground electrode points with a drop of paint (BMW Mysticblau).
I hand tightened the plugs first to check the electrode direction. The mixture rolls forward at the top of the cylinder so I would like to avoid having the plug gap shadowed by the ground electrode. Swap plugs between cylinders if necessary knowing there will be another 1/4 to 1/3 turn required to compress the washer.
Ideally the gaps would end up pointing to the rear. In this case best I could do was to the side.
This probably doesn't make any noticeable difference but it did provide some entertainment.


I dusted off the infamous CLB mahogany differential manometer.
Adjustment was done from the left hand side of the bike.


The wondiferous plumbing setup.
The manometer plumbs to the nipples used by the factory for the map sensor.
The map sensor is plumbed to the extra nipple on the center TB with one of the short factory MAP tubes. It's a little out of the focal field but still can be seen.
The IAT sensor can be seen dangling over the left frame rail.
Both sensors must be pulled from their normal location on the airbox.


Once the plumbing is setup the fuel tank must be fitted. If we are going to run an F.I. bike a fuel pump and supply could come in handy.
Set the front of the tank on but not in the front mount. Pin the back of the tank to its bracket with the stock bolt. I then used a rubber sanding block on end to space the front of the tank up. Space is important as you have to reach in under the tank to adjust the bleed screws.
Here is the view over the left frame rail. There is plenty of room to reach in with a small flat blade screwdriver.

Be sure to connect the fuel line, fuel pump connector and fuel gauge connector.

Last edited by CLB; 03-09-2009 at 12:43 AM. Reason: misc errors
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post #2 of 47 (permalink) Old 03-08-2009, 03:02 AM Thread Starter
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TB Balance pix (2)

The plumbing viewed from the right hand side, in case that adds anything.

Can you spot the hidden MAP and IAT sensors?


Next up, start the bike and let it warm up so the idle speed stabilizes. Then check the damages. This was a bit off but still only about half the mismatch the bike had new.



Slowly turn the bleed screws in on the low vacuum cylinders (2&3 in this case) Only turn screws out to adjust in event that one bottoms before the adjustment is complete. This way you avoid adding too much bleed. Too much bleed and the idle speed will float above the point the stepper attempts to regulate.
Well... that's better.

Last edited by CLB; 03-08-2009 at 01:31 PM.
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post #3 of 47 (permalink) Old 03-08-2009, 04:03 AM
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Great post CLB.

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post #4 of 47 (permalink) Old 03-08-2009, 04:34 AM
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Excellent

Can I ship my bike over to yours then?

There comes a point in your life when you realize: Who matters, who never did, who won't anymore...
And who always will.
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post #5 of 47 (permalink) Old 03-08-2009, 04:52 AM
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CLB

Thanks for posting the pics.

Do you recheck the balance with the airbox on? I would have thought having the airbox on would make some difference.

I realise that it is a PITA to do pulling the airbox on and off.

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post #6 of 47 (permalink) Old 03-08-2009, 11:42 AM
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My lumber budget was smaller than CLB's.

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This is how the rig attaches to my handy dandy cart.

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I loosely re-pin the rear of the tank and support the front with a calibrated block of certified pine.

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Initial reading. Also shows how the tubes are connected.

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I went through this exercise just to see how it works, and I had the time to do it. If I did not want to entertain myself, I would just buy one of the ready made sticks such as from Motion Pro, or others. BTW, I also ran the TuneBoy to see what it thought of what I was doing to the balance.

No comments re the messy bench top. That is what happens when you do stuff. Anyway, the bench set up has been changed since that pic with an addition.

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Last edited by oldndumb; 03-08-2009 at 11:46 AM. Reason: CRS
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post #7 of 47 (permalink) Old 03-08-2009, 12:03 PM
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What a hell? I need more info on this setup. I want to do TB sync this weekend, and this looks like a perfect tool.

Can you please tell me the size of the hoses, the length, etc, etc, etc. What kind of liquid is that?


What are the other alternatives? TuneBoy?

Last edited by a1fa-; 03-08-2009 at 12:09 PM.
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post #8 of 47 (permalink) Old 03-08-2009, 12:17 PM
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Hose size is not that critical. I think mine was 5/32 or 3/16.

Length is not that critical either. Mine could have easily been shorted a few feet.

Liquid is also optional, depending on what you want to risk getting into your engine. I used ATF because it was convenient.

Don't get carried away with these pics and start doing something you might not fully understand. You need to have knowledge of what is going on with your engine and why it seems to have a mind of its own. The ECU will also laugh at you at times.

Checking the TPS voltages before doing a balance is a good idea.

CLB has some good pointers in his post.

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Last edited by oldndumb; 03-08-2009 at 12:19 PM.
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post #9 of 47 (permalink) Old 03-08-2009, 12:46 PM
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Great artisanship by CLB and oldndumb on making their own manometers.
For those, like me who lack the creativity & need a lazy alternative - but realistically inspired more by space savings - you can purchase the Morgan Carbtune unit.
The Carbtune is a little under 12" tall. Worth getting the optional extra storage case and you can pack it & all the hoses away neatly and throw it in your tool chest.
No mercury (or any liquid) in these units.



Best time in ages for US buyer to purchase this due to the favorable exchange rate. Less than $85 shipped (per exchange rate at time of writing). Morgan ship this super-quick and even though they are out of the UK and you are in the US, you will have it inside a week (I did).

As ond suggests, I believe MotionPro does a similar product - but more expensive and I would suggest, not as nice.

It's important to understand that all these tools - home-built or store-bought - do the same thing and the value of CLB's fabulous post is in providing the how-to; and best of all maybe, for stimulating interest for members to get out there & DO this!

Very easy to use, here's a pic of mine on my TL (hence only two cylinders being uitilized! ) showing before and after results.

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post #10 of 47 (permalink) Old 03-08-2009, 01:15 PM
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Some people got all da money.

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