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C3 guy with to much cable.

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Old Aug 17, 2015 | 03:43 PM
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Default C3 guy with to much cable.

I have a C3 with TPI, I'm trying to put a stock C4 throttle cable on it, but the cable seems to be about 5/8 of an inch to long. Any ideas on how to shorten it? It looks so much better than the one I made a couple years ago I don't want to hack it up to much.

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Zorro.
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Old Aug 17, 2015 | 03:55 PM
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Originally Posted by Zorro O
I have a C3 with TPI, I'm trying to put a stock C4 throttle cable on it, but the cable seems to be about 5/8 of an inch to long. Any ideas on how to shorten it? It looks so much better than the one I made a couple years ago I don't want to hack it up to much.

Thanks
Zorro.
So what is this TPI? An L98 or an LT1. Is the conduit anchored correctly and your only problem the actual inner cable, a conduit problem or both?
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Old Aug 17, 2015 | 04:19 PM
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Originally Posted by WVZR-1
So what is this TPI? An L98 or an LT1. Is the conduit anchored correctly and your only problem the actual inner cable, a conduit problem or both?
The TPI is from an 86 vette L98. I think the problem is the inner cable if I pull the outer cable back 5/8 from its bracket every thing seems to work except the rubber cover over the trottle end of the cable hangs up on out part of the rest of the cable. Oh, and having the outer cable held back with vice grips isn't the look I'm after. With everything hooked up to the factory
Bracket and gas peddle I only get half throttle.
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Old Aug 17, 2015 | 04:49 PM
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Is there an excepted way to shorten a stock trottle cable?

Zorro
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Old Aug 17, 2015 | 06:35 PM
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Originally Posted by Zorro O
Is there an excepted way to shorten a stock trottle cable?

Zorro
I'd say yes - maybe!

Here's a C4 TPI L98 - if you have the anchor #11 the conduit clamp #10 and the other end of the conduit anchored appropriately to the firewall/cowl of the car and the cable passing through the C3 pedal support as best I remember them being constructed (I'll look) and you mention only having limited cable you could experiment with shortening the inner cable using a "lead sinker" crimped onto the cable to control the "pull length". This is how I've done it in the past to generally temporarily create something that works and then do a more complete fabrication once it was working.

Shouldn't be that difficult once the conduit is properly anchored at the throttle-body and secured at a midpoint or two on the way to the accelerator pedal support at the firewall/cowl.

The #10 conduit clamp is actually a spark plug wire support that can be found in most auto part stores. You need to have the correct stud or fabricate one.

Name:  TPI Throttle.png
Views: 504
Size:  34.9 KB



I looked at a late C3 pedal support illustration and I see no reason why this wouldn't work. In your particular case I believe you could likely use a "lead sinker" for a permanent fix but I usually had a parking brake cable slug crimped onto whatever it was that we decided on. If you can get 1/2 throttle with very little pedal effort and no bind presently and can anchor the conduit at each end it should be a done deal.

Last edited by WVZR-1; Aug 17, 2015 at 06:50 PM.
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Old Aug 17, 2015 | 06:50 PM
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Fixed it, cut off the stock cable end for the throttle body and put on an adjustable one I had around the house. Small jobs can become large time wasters. Funny the pivot arm for my gas peddle seems to have somehow gotten bent, I had to take the insolation out from under the carpet behind it to get full throttle. Wonder how that happens?

Zorro
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Old Aug 17, 2015 | 06:55 PM
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Originally Posted by Zorro O
Fixed it, cut off the stock cable end for the throttle body and put on an adjustable one I had around the house. Small jobs can become large time wasters. Funny the pivot arm for my gas peddle seems to have somehow gotten bent, I had to take the insolation out from under the carpet behind it to get full throttle. Wonder how that happens?

Zorro
I don't know that I would have done a modification at the throttle body lever or that I would have cut the braided cable to accomplish it BUT it's your project.
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Old Aug 17, 2015 | 07:06 PM
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Originally Posted by WVZR-1
I'd say yes - maybe!

Here's a C4 TPI L98 - if you have the anchor #11 the conduit clamp #10 and the other end of the conduit anchored appropriately to the firewall/cowl of the car and the cable passing through the C3 pedal support as best I remember them being constructed (I'll look) and you mention only having limited cable you could experiment with shortening the inner cable using a "lead sinker" crimped onto the cable to control the "pull length". This is how I've done it in the past to generally temporarily create something that works and then do a more complete fabrication once it was working.

Shouldn't be that difficult once the conduit is properly anchored at the throttle-body and secured at a midpoint or two on the way to the accelerator pedal support at the firewall/cowl.

The #10 conduit clamp is actually a spark plug wire support that can be found in most auto part stores. You need to have the correct stud or fabricate one.

Attachment 47908787



I looked at a late C3 pedal support illustration and I see no reason why this wouldn't work. In your particular case I believe you could likely use a "lead sinker" for a permanent fix but I usually had a parking brake cable slug crimped onto whatever it was that we decided on. If you can get 1/2 throttle with very little pedal effort and no bind presently and can anchor the conduit at each end it should be a done deal.
The sinker was going to be my next move. I think most of my problem was from the sinker that was installed on the cable between my firewall and the back of the pivot arm not letting me get the full travel. The arm is a little bent also. The adjustable end I put on will let me take up slack when the cable stretches or if I ever fix the pivot. Thanks for your time and research. It will sure help with the rest of the job.

Zorro.
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Old Aug 17, 2015 | 07:35 PM
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Originally Posted by Zorro O
Fixed it, cut off the stock cable end for the throttle body and put on an adjustable one I had around the house. Small jobs can become large time wasters. Funny the pivot arm for my gas peddle seems to have somehow gotten bent, I had to take the insolation out from under the carpet behind it to get full throttle. Wonder how that happens?

Zorro
Got a pic of the adjustable end? I was gonna do the zip tie fix(same as fish weights)
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Old Aug 17, 2015 | 08:52 PM
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This is it there is a set screw on the back. I thought the new cable was GM it's been sitting here for over a year. When I went down to take the photo I noticed the box say NAPA and remembered that I could not find a GM one to fit but NAPA has different lengths so I bought what my tape measure said I needed.

Zorro

Last edited by Zorro O; Aug 17, 2015 at 09:24 PM.
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Old Aug 18, 2015 | 12:17 AM
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Your TV cable is out of adjustment. It should be tight with no slack.
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Old Aug 18, 2015 | 12:47 AM
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Thx and next question, where did you get that end? Only thing I can find similar is in this kit http://www.summitracing.com/parts/mrg-5657/overview/
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Old Aug 18, 2015 | 01:06 AM
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Originally Posted by BOOT77
Thx and next question, where did you get that end? Only thing I can find similar is in this kit http://www.summitracing.com/parts/mrg-5657/overview/
Mine came from that kit, from summit. Different brand but looked just like it. It pays to keep left over parts.

Zorro.

Last edited by Zorro O; Aug 18, 2015 at 02:21 AM.
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Old Aug 18, 2015 | 01:15 AM
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Originally Posted by Cliff Harris
Your TV cable is out of adjustment. It should be tight with no slack.
Nice catch. I have it tight now, I need to find or make a new one.

Zorro.
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Old Aug 18, 2015 | 01:54 AM
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Originally Posted by BOOT77
Thx and next question, where did you get that end? Only thing I can find similar is in this kit http://www.summitracing.com/parts/mrg-5657/overview/

Speedway should be able to help you with a separate purchase, you specify stud diameter. I'd send them the snapshot that "Zorro O" posted to ID your need. They might try to sell you a Lokar cable kit but they're generally quite accommodating. They service what they sell. A local Harley/cycle shop also or an equipment service facility.


Originally Posted by Cliff Harris
Your TV cable is out of adjustment. It should be tight with no slack.

Originally Posted by Zorro O
Nice catch. I have it tight now, I need to find or make a new one.

Zorro.
Don't know what trans you're actually using but Speedway for you also maybe.

http://www.speedwaymotors.com/Garage...it,116202.html

Last edited by WVZR-1; Aug 18, 2015 at 02:07 AM.
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