Will a carb spacer throw off the TV geometry on a 700r4?
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Car: 91 rs
Engine: Carbed 355 CR 9:1 xr276 cam
Transmission: 700r4 2600 stall
Axle/Gears: 3.42
Will a carb spacer throw off the TV geometry on a 700r4?
Just as the title says. I have a carb spacer on my edelbrock carb. The spacer is a 1/2 inch spacer. I have the correct brackets to align the TV cable on the carb ( one on the intake and one on the carb). Is the 1/2 an inch the carb spacer raises the carb going to throw of the correct geometry of the TV?
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Will a carb spacer throw off the TV geometry on a 700r4?
Which brackets are you using?
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Car: 1987 Camaro SC, 1999 Z28
Engine: GMPP 350HO, LS1
Transmission: Built 700r4/EDGE 3200, T56
Axle/Gears: 3.42 Eaton 7.625, 3.42 Zexel Torsen
Re: Will a carb spacer throw off the TV geometry on a 700r4?
if a bracket is mounted to the intake then yes your geometry will be thrown off.
as of right now, how does it drive with all the aftermarket components, compared to stock?
as of right now, how does it drive with all the aftermarket components, compared to stock?
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Car: 91 rs
Engine: Carbed 355 CR 9:1 xr276 cam
Transmission: 700r4 2600 stall
Axle/Gears: 3.42
Re: Will a carb spacer throw off the TV geometry on a 700r4?
EDL-8036 http://www.summitracing.com/parts/EDL-8036/
SUM-700203 http://www.summitracing.com/parts/SUM-700203/
Shift Points are too high shifting at:
1/2 throttle:
Shifts from 1 to 2 at about 25MPH and 5000 - 5250 RPMS
Shifts from 2 to 3 at about 55 MPH and 5000 - 5250 RPMS
I did get on it a little not quiet WOT but 3/4 + and it shifted at 6000 plus or minus 200 RPM it was hard to watch the tach and the road.
Engines power band: The engines peak power is 382hp@ 5100 and 430 ft/lb of TQ @ 4500 RPM
SUM-700203 http://www.summitracing.com/parts/SUM-700203/
Shift Points are too high shifting at:
1/2 throttle:
Shifts from 1 to 2 at about 25MPH and 5000 - 5250 RPMS
Shifts from 2 to 3 at about 55 MPH and 5000 - 5250 RPMS
I did get on it a little not quiet WOT but 3/4 + and it shifted at 6000 plus or minus 200 RPM it was hard to watch the tach and the road.
Engines power band: The engines peak power is 382hp@ 5100 and 430 ft/lb of TQ @ 4500 RPM
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Car: 91 rs
Engine: Carbed 355 CR 9:1 xr276 cam
Transmission: 700r4 2600 stall
Axle/Gears: 3.42
Re: Will a carb spacer throw off the TV geometry on a 700r4?
I have an Edelbrock Air gap manifold, since it sits higher than a stock manifold and also raises the carb wouldn't that throw off the proper geometry for the TV cable too?
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Car: 91 rs
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
I don't know if I made it clear or not in my previous posts I have an Edelbrock carb as well as the edelbrock Air Gap manifold. Would I still need the Holley bracket even with the edelbrock carb? It sounded like from the description that they are to be used with Holley carbs.
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Car: 85 SC, 86 Berlinetta
Engine: V6, V8
Transmission: 700r4, 700r4
Re: Will a carb spacer throw off the TV geometry on a 700r4?
My bad. Sorry. I've never seen that before. I did notice you had an Edelbrock after posting it but thought the brackets would be similar and the general idea still apply. I guess I would contact Edelbrock and tell them the part numbers of what you have and size of the spacer and see what they have to say.
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Car: '86 Z28, '91 RS
Engine: 305ci, 305ci
Transmission: TH200c (no kidding), TH700r4
Axle/Gears: 2.73, 2.73
Re: Will a carb spacer throw off the TV geometry on a 700r4?
The simple answer is yes. You need to adjust the TV cable. The teeth in the adjuster are very tiny so just think about it changing the geometry even slightly will make it off.
Adjust it normally, hit the release button pull it all the way back into the adjuster, let go of the button then press the pedal firm to the floor and go test it, it should be close if not right on. If not perfect to dial it in by hand using two hands twist the throttle open up hard. Do NOT pull, pry or otherwise lever the throttle linkage it will snap clean off, twist it from the side of the car trying to put the least pressure on the throttle shaft. This should get you another "click" or two.
An easy test is in first gear accelerate normally and as soon as it shifts to second floor it and if it doesn't shift to 1st it is off.
Adjust it normally, hit the release button pull it all the way back into the adjuster, let go of the button then press the pedal firm to the floor and go test it, it should be close if not right on. If not perfect to dial it in by hand using two hands twist the throttle open up hard. Do NOT pull, pry or otherwise lever the throttle linkage it will snap clean off, twist it from the side of the car trying to put the least pressure on the throttle shaft. This should get you another "click" or two.
An easy test is in first gear accelerate normally and as soon as it shifts to second floor it and if it doesn't shift to 1st it is off.
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Car: 1987 Camaro SC, 1999 Z28
Engine: GMPP 350HO, LS1
Transmission: Built 700r4/EDGE 3200, T56
Axle/Gears: 3.42 Eaton 7.625, 3.42 Zexel Torsen
Re: Will a carb spacer throw off the TV geometry on a 700r4?
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
The geometry will be different. The cable will be pulled at a different angle relative to the throttle arm, so there will be a different amount of extension per degree of opening throughout the range of travel.
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Car: 1984 Z28 Hardtop
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Axle/Gears: 3.54 Dana 44
Re: Will a carb spacer throw off the TV geometry on a 700r4?
Yes, or use a bracket that mounts to the carb.
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Car: 84 Trans Am
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
Reread Doom86's post, cause it's on the money. a throttle valve cable doesn't care about angles, only about the correct travel at the correct time, which is set by the adjuster. good luck.
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Car: 1984 Z28 Hardtop
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
Correct travel at the correct time depends in part on the angle.
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
Which once again, as doom86 posted, is compensated for at the tv adjuster at the carb. Hope you're all set by now. Doesn't take very long.
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
It can't be compensated for by the adjuster. Consider the absurd case where the cable meets the throttle arm coming down from the vertical. In that case, maximum TV cable extension is with the throttle fully closed, and the cable actually retracts as the throttle is opened. Of course in practical alignments it won't be that extreme, but the geometry difference can cause a noticeable difference in shift timing and feel when the bracket is mounted well below the throttle arm.
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
I agree with that AP, You're talking absured angles. The tank mentionred he had correct brackets to mount his TV cable to his new set-up. And i'ld like to give him the benefit of the doubt that he's got enough travel. Now isn't it just fine tuning of the TV cable adjuster to get the shift points to his desired taste?
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Car: 85 SC, 86 Berlinetta
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
The correct brackets are assuming the manifold and carburetor are also as per design, the spacer changes that IMO.
My take on it is that the adapter for the throttle is a predetermined length from the pivot point along the Y axis which sets the amount of pull along the X axis. As the throttle moves to WOT the less it moves along the X axis and the more it moves along the Y axis. But the cable is only affected by the movement along the X axis.
If you were to change (lower) the height of where the adjuster is mounted the angle of the cable would also change, which would also change (lower) the effective distance at the throttle. Imagine drawing a line along the cable and measuring the distance from that line and the pivot point. To me this would change the amount the cable is drawn through the entire sweep to WOT, or even start out less, then increase and then decrease again.
Whether it's enough to make a difference is another thing (ie. 1/2" spacer?), but having the adjuster mounted to the base of the carb would make this a non issue. Which is why I believe that the other manufacturers use the base of the carb for the adjuster mount.
My take on it is that the adapter for the throttle is a predetermined length from the pivot point along the Y axis which sets the amount of pull along the X axis. As the throttle moves to WOT the less it moves along the X axis and the more it moves along the Y axis. But the cable is only affected by the movement along the X axis.
If you were to change (lower) the height of where the adjuster is mounted the angle of the cable would also change, which would also change (lower) the effective distance at the throttle. Imagine drawing a line along the cable and measuring the distance from that line and the pivot point. To me this would change the amount the cable is drawn through the entire sweep to WOT, or even start out less, then increase and then decrease again.
Whether it's enough to make a difference is another thing (ie. 1/2" spacer?), but having the adjuster mounted to the base of the carb would make this a non issue. Which is why I believe that the other manufacturers use the base of the carb for the adjuster mount.
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
EDL-8036 http://www.summitracing.com/parts/EDL-8036/
SUM-700203 http://www.summitracing.com/parts/SUM-700203/
Shift Points are too high shifting at:
1/2 throttle:
Shifts from 1 to 2 at about 25MPH and 5000 - 5250 RPMS
Shifts from 2 to 3 at about 55 MPH and 5000 - 5250 RPMS
I did get on it a little not quiet WOT but 3/4 + and it shifted at 6000 plus or minus 200 RPM it was hard to watch the tach and the road.
Engines power band: The engines peak power is 382hp@ 5100 and 430 ft/lb of TQ @ 4500 RPM
SUM-700203 http://www.summitracing.com/parts/SUM-700203/
Shift Points are too high shifting at:
1/2 throttle:
Shifts from 1 to 2 at about 25MPH and 5000 - 5250 RPMS
Shifts from 2 to 3 at about 55 MPH and 5000 - 5250 RPMS
I did get on it a little not quiet WOT but 3/4 + and it shifted at 6000 plus or minus 200 RPM it was hard to watch the tach and the road.
Engines power band: The engines peak power is 382hp@ 5100 and 430 ft/lb of TQ @ 4500 RPM
#22
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
The correct brackets are assuming the manifold and carburetor are also as per design, the spacer changes that IMO.
My take on it is that the adapter for the throttle is a predetermined length from the pivot point along the Y axis which sets the amount of pull along the X axis. As the throttle moves to WOT the less it moves along the X axis and the more it moves along the Y axis. But the cable is only affected by the movement along the X axis.
If you were to change (lower) the height of where the adjuster is mounted the angle of the cable would also change, which would also change (lower) the effective distance at the throttle. Imagine drawing a line along the cable and measuring the distance from that line and the pivot point. To me this would change the amount the cable is drawn through the entire sweep to WOT, or even start out less, then increase and then decrease again.
Whether it's enough to make a difference is another thing (ie. 1/2" spacer?), but having the adjuster mounted to the base of the carb would make this a non issue. Which is why I believe that the other manufacturers use the base of the carb for the adjuster mount.
My take on it is that the adapter for the throttle is a predetermined length from the pivot point along the Y axis which sets the amount of pull along the X axis. As the throttle moves to WOT the less it moves along the X axis and the more it moves along the Y axis. But the cable is only affected by the movement along the X axis.
If you were to change (lower) the height of where the adjuster is mounted the angle of the cable would also change, which would also change (lower) the effective distance at the throttle. Imagine drawing a line along the cable and measuring the distance from that line and the pivot point. To me this would change the amount the cable is drawn through the entire sweep to WOT, or even start out less, then increase and then decrease again.
Whether it's enough to make a difference is another thing (ie. 1/2" spacer?), but having the adjuster mounted to the base of the carb would make this a non issue. Which is why I believe that the other manufacturers use the base of the carb for the adjuster mount.
#23
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Car: 85 SC, 86 Berlinetta
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Re: Will a carb spacer throw off the TV geometry on a 700r4?
I'm not saying I know everything either, just an observation of the geometry is all. I'm here to learn just like anyone else and just saying how I see it, and seeing if you or anyone else sees it the same way. I'm open to the fact that if it's a 1/2 spacer it probably wouldn't matter, but not knowing the internals other than how critical they say they are I would be careful in just letting it go.
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