Holley Sniper EFI w/ AOD TV Cable geometry

[crutch]

I completed my Holley Sniper EFI swap but don't think the geometry is correct for the AOD TV Cable shift points.

On the Sniper EFI throttle body there are two holes for the TV cable, one is labeled for TH350 and the other is 200R4/700R4. I initially purchased a TV cable corrector and when I overlayed it on the throttle arm, it looked like when I mount it in the TH350 hole, that the new ball studd location was where the 200R4/700R4 hole was located. So I just hooked my TV cable directly to the 200R4/700R4.

Anyone else have the Sniper EFI setup with AOD transmission and any advice here? Thanks.

Here is a picture of the throttle linkage on the Sniper EFI.

 

[crutch]

one other thing to note, I rotated the throttle linkage on the sniper all way until it stops and then pulled the TC cable all the way out until it stops and set the TV cable end-stop there. When I released the throttle there was quite a bit of slack between cable stop end and when it engages the throttle. Much more then what I had when I had my edelbrock carb.

 

[crutch]

Come to find out the Lokar TV arm on the transmission has a black hose around the cable and inside the spring and it was too long preventing the TV cable from complete travel. Going to do a test drive now and see if this is the ticket.

 

[Broncobowsher]

Something to think about. That EFI has 1:1 secondaries (as do most 4-barrel throttle body EFI). The TV is taking engine load based off throttle postion. So at a light throttle (say 20%) you will be flowing more air and making more torque then the same throttle setting with a carb. Too much torque for the TV setting is bad for transmissions. There may need to be a little more engineering in the linkage design besides just getting the travel to match. Off the top of my head, you need to make the linkage a bit more progressive. Lots of TV travel off idle, little at full throttle. If you have issues in light to mid throttle driving (holding too high of a gear or worse slipping) this is where to address it.

 

[crutch]

Thanks for the heads up. I have read somewhere where people made an extension bracket for the TV bracket attaches to the transmission, perhaps they were trying to correct what you are speaking of. It drives way better already, I'll keep an eye on the shift points and see if I need more adjustment. Thanks!


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[crutch]

Hey Broncobowsher, is this what you were referring to? Seems like this would pull more pressure off idle.

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[Broncobowsher]

No.

I really need a white board for this...

The throttle rotates about 80°. For simplicity I am going to call it 90°, or a quarter of a revolution.
Draw a line through the throttle shaft and the pivot for the TV (cable or rod).
Another line for the direction of pull of the cable. The cable makes this line
The angle between those two lines. Through the arc of travel of the throttle.

Typical is 45° at idle, 90° at half, 135° at full. That gives a fairly linear reference between angle and cable pull.

Now change the geometery so idle is closer to 90° and full throttle is near 0°
What this does for you is make more cable travel at off idle throttle. But as you approach full throttle there is very little cable travel.
So idle throttle is still idle transmission
20% throttle is 35% TV
50% throttle is 60% TV
70% throttle is 85% TV
100% throttle is 100% TV.

Does that make sense? Or I could make the 5-hour drive over to San Diego.

 

[crutch]

I think I understand now. I created a quick drawing, does this look right? The geometry change is on the throttle body linkage. Happy to host you anytime in SD!

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[Broncobowsher]

That is looking right. I don't see the throttle shaft in the diagram, that would be the pivot point that needs to be referenced.

New lever, vertical
Move TV bracket forward to match.

Someone who is a lot better with math could calculate what the new distance of the new lever needs to be. It's probably a little different than the original. I would be doing it trial and error, probably with a little pair of vicegrips holding parts together until I felt I had it right.

 

[grs44310]

Crutch did you get your TV setting figured out? What did you end up doing? I’m going through the exact same thing right now.

Thanks,
Greg

 

[bronco italiano]

Don't even risk it. Bowtie overdrives. Cry once on the price. Call them as it won't be advertised. I got the correct kit for my sons firebird with 2004R swap.

 

[crutch]

Crutch did you get your TV setting figured out? What did you end up doing? I’m going through the exact same thing right now.

Thanks,
Greg

Hey Greg, not really. I wish I would have just invested in the 4R70W, the TV cable has been a headache. I fabricated up a bracket but had problems with it hitting the valve cover so scrapped it. That Sniper throttle lever made the pedal so tight I added one of these brackets which helped with pedal feel considerably but don't think I have the angles right yet. https://www.holley.com/products/fue...efi/sniper_efi_service_components/parts/20-16

I've been working on other projects so haven't driven it much. I want to just pull the transmission out and go a different route to be honest with you. Keep me posted if you figure it out.