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Thread: Throttle Linkage

  1. #1
    #9160 BB767's Avatar
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    Throttle Linkage

    Installed the throttle cable yesterday on my Roadster. Less than impressed with the response with the cable. Looking at the mechanical linkage option. Would you please tell me your experience with this mod? Do you like it, was it worth the bother, was there much improvement in throttle response and sensitivity, how hard was the install, etc?
    MK4 - complete kit - Blueprint 427W - FAST XFI Street - TKO 600 .64 - 3.55 - 17" Halibrands

  2. #2
    East Coast Speed Machines Erik W. Treves's Avatar
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    Russ Thompson throttle pedal!
    FFR 1879, Blown DSS 306,REDLINE management, VeryCoolParts Tuned 460RWHP

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    FFR 8335, Black Mamba, 289 FIA CSX 2001 tribute car, 347, 48 IDA webers, VCP Tuned, 311 RWHP 386 RWTQ, 3-link, Trigo's

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  3. #3
    Senior Member Boydster's Avatar
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    I'm using a Forte mechanical throttle with a Russ Thompson pedal controlling an FiTech. I've run my engine about 3 times, but the throttle response is amazing. And very controllable in very small amounts.
    ---Boyd---
    MkIV #9042 build thread
    www.boss427.us
    Plan: 427W-X, TKO600, Moser 3.55 rear. Delivered Feb 2017, first start Oct 22, 2017

  4. #4
    Scott slpro1207's Avatar
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    X2 on Forte mechanical throttle. Just installed it last week. What a difference it makes. Smooth and instant response.
    Delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SMB 427. First start and go kart 8/19/2017.

  5. #5
    Mechanical ... buy Forte’s unit.
    Mk 4 Roadster
    October 25, 2012 - Kit Arrives
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    August 23, 2015 - Rolling Chassis/Engine & Transmission Installed
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  6. #6
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    Never installed a cable, but also have stacked injection. Once squared away, excellent throttle control. Used plans from on this forum and the other, not Forte's unit, but seeing Forte's, should work great. Measure 50 times, make holes once! If you are building the rest of the car, really not that hard to install. Assuming the body's off!

  7. #7
    #9160 BB767's Avatar
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    That's what I thought. Glad you all agree, looks like mechanical is the way to go. Thanks again for the advice.
    MK4 - complete kit - Blueprint 427W - FAST XFI Street - TKO 600 .64 - 3.55 - 17" Halibrands

  8. #8
    Senior Member MPTech's Avatar
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    Little confused, are you sure it's the cable?
    MANY have installed it without issue.
    If you want the mechanical, I understand completely and think it's a great piece, but the cable can be made to work well too.
    F5R #7446: MK4, 302, T5 midshift, 3.55 Posi IRS, 17" Halibrands
    Delivered 4/4/11, First start 9/29/12, Licensed 4/24/13, off to PAINT 2/15/14!! Wahoo!

  9. #9
    Senior Member CraigS's Avatar
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    Maybe 4-5 yrs ago before Mike had his for sale I did one using a parts list from a forum. My first drive the car was almost uncontrollable. I had the same return springs as w/ the cable but the effort was so low I went around ONE block in my neighborhood and came back to install another spring. Mech linkage is so much better it is almost unbelievable.
    FFR MkII, 408W, Tremec TKO 500, 2015 IRS, DA QA1s, Forte front bar, APE hardtop.

  10. #10
    #9160 BB767's Avatar
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    MP, just to clarify, I have not ran the engine yet, I will give the cable a chance before I change it out. I would rather not spend the extra time and money if I don't have to. I have adjusted the cable as tight as I can get it, taking up all the slack, without moving the throttle. There are no kinks in the cable and it is not binding. The throttle is closing just fine. But when I sit in the seat and simulate using the gas pedal while watching the response of the throttle, it does not look to be very smooth or precise. I can see a lag between what my foot does and what the throttle does, and when trying to adjust it very smoothly, the throttle does not appear to be moving as smoothly as I am working the pedal. Although I have ran the cable as straight as possible it still has to make a big S turn from the firewall to the linkage, that cannot be a very efficient path but there is no other way to get from point to point. All in all I am not very happy with what I am seeing but I will try it on a live car here soon and have a final answer then. Thank you for the comment and vote of confidence for the cable. I am glad some are happy with it and I do hope that it works out for me.
    MK4 - complete kit - Blueprint 427W - FAST XFI Street - TKO 600 .64 - 3.55 - 17" Halibrands

  11. #11
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    A few years ago edwardb posted the parts he used for his mech throttle in his build thread for his second build. Thanks to him I have all of the parts for installation when the time comes.
    JR
    MK4 complete kit #9059 ordered 1/19/17 delivered 3/23/17, 2015 IRS, Fortes/DART347,TKO 600, hyd clutch, P/S, 12.88 wilwood brakes front and rear, high back kirkey seats, heater/defrost and vintage gauges

  12. #12
    Senior Member Boydster's Avatar
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    If you do a mechanical throttle, drop the firewall mounts as low as you can against the 2x2. Even cut the washers used on the dash side of the firewall to get them as low as possible. The arms inside the footwell needs the height to rotate properly. Ask me how I know, as I figure out how to plug firewall holes...
    ---Boyd---
    MkIV #9042 build thread
    www.boss427.us
    Plan: 427W-X, TKO600, Moser 3.55 rear. Delivered Feb 2017, first start Oct 22, 2017

  13. #13
    Senior Member edwardb's Avatar
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    Quote Originally Posted by jrcuz View Post
    A few years ago edwardb posted the parts he used for his mech throttle in his build thread for his second build. Thanks to him I have all of the parts for installation when the time comes. JR
    Thanks for the shout out. Here's the post in my build thread where I listed the parts and showed the installation. This was before Mike Forte's was available. His looks OK but this works too. There are multiple ways to install these. Some used different angles and/or directions on the arms than I did. But I can say what's pictured now has thousands of miles (by me plus the new #7750 owner) and works smoothly and perfectly. Whatever way you go, I recommend a linkage over the cable. Also highly recommend to decide while building. Wouldn't be fun to install in a completed build. Plus FWIW it's more authentic to the originals.

    http://thefactoryfiveforum.com/showt...l=1#post137426
    Last edited by edwardb; 11-13-2017 at 05:24 PM.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014.
    Build 2: Mk4 Roadster #7750. Sold 04/10/2017. #7750 Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. 03 of 20. Deliv: 08/05/2015. 2015 crate Coyote, 2015 IRS. Legal 04/18/2017. Red/white club for the third time. #8674 Build Thread

  14. #14
    Senior Member MPTech's Avatar
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    Quote Originally Posted by BB767 View Post
    Although I have ran the cable as straight as possible it still has to make a big S turn from the firewall to the linkage, that cannot be a very efficient path.............
    If it helps, I'm running mine on a GT40-style EFI intake, with the linkage on the PS. I fabricated a bracket to run the cable out the front, so my tight "S" curve turned into a easy "C" curve. I've seen others turn the carb around in a similar fashion. (for the record, I prefer the mechanical too, and if I was building mine now, I'd also go with the linkage.)
    Didn't catch it, did you say you have a Russ Thompson pedal already? Better adjustment and response. They are great, regardless which throttle mechanism you use.

    Good Luck
    F5R #7446: MK4, 302, T5 midshift, 3.55 Posi IRS, 17" Halibrands
    Delivered 4/4/11, First start 9/29/12, Licensed 4/24/13, off to PAINT 2/15/14!! Wahoo!

  15. #15
    What is a good choice for a throttle cable bracket?
    MK4 #9121 - Complete kit - Stroked 351, T5x, 3.55 Rear End, 3-Link - Picked up 6/17/17

  16. #16
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    Another vote for Forte's throttle linkage and russ thompson pedal.

  17. #17
    Quote Originally Posted by jwebb View Post
    What is a good choice for a throttle cable bracket?
    I used AED works great. Scott

    Linkage 002.jpg

  18. #18
    Well Used Member boat737's Avatar
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    Quote Originally Posted by edwardb View Post
    Thanks for the shout out. Here's the post in my build thread where I listed the parts and showed the installation. This was before Mike Forte's was available. His looks OK but this works too. There are multiple ways to install these. Some used different angles and/or directions on the arms than I did. But I can say what's pictured now has thousands of miles (by me plus the new #7750 owner) and works smoothly and perfectly. Whatever way you go, I recommend a linkage over the cable. Also highly recommend to decide while building. Wouldn't be fun to install in a completed build. Plus FWIW it's more authentic to the originals.

    http://thefactoryfiveforum.com/showt...l=1#post137426
    I followed Edwarb's parts list verbatim, and with a couple of small changes, his installation too. (Thanks Paul) Only have a few miles on it, but works flawlessly, and looks very clean and efficient too.
    Attached Images Attached Images
    If Brute Force doesn't work, you're not using enough of it.
    Bought a partially completed MK4. The Basic Stuff: MK4 Complete Kit #8439. The Extra Stuff: Wilwood's, 17" Halibrands, Stainless brake and fuel lines, Breeze cooling and Battery mount.
    The Old Fart Stuff: Heater, Seat Heaters, Footbox Fresh Air, Stereo, Keyless ignition, Power Steering, Hyd Clutch.
    The Young and Dumb Stuff: 427w Dart, TKO600, 3 link Moser M9/Ford 9", 3.5:1, Eaton TruTrac Posi

  19. #19

  20. #20
    I used the Fortes kit with the Russ Thompson gas pedal and it works great. I polished and clear coated all the parts and love the look and instant response of the solid linkage.

  21. #21
    Senior Member AC Bill's Avatar
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    If you choose to go with a cable, use the Russ Thompson pedal. Many builders found a significant difference, after switching to it.
    I wasn't the cable that was the real issue, it was the pedal set up. It was not known for being smooth.
    You have to use some care in routing the cable, mainly keeping it away from any major heat. I wrapped mine in DEI heat tape, for extra protection.

  22. #22
    Senior Member
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    When I attended the build school they showed how the ffr pedal can bind at full throttle so needless to say I have the Russ Thompson pedal to install.
    JR
    MK4 complete kit #9059 ordered 1/19/17 delivered 3/23/17, 2015 IRS, Fortes/DART347,TKO 600, hyd clutch, P/S, 12.88 wilwood brakes front and rear, high back kirkey seats, heater/defrost and vintage gauges

  23. #23
    Quote Originally Posted by johnnybgoode View Post
    I used AED works great. Scott

    Linkage 002.jpg
    I have the same one. Works good, looks good. Well, my springs are going rusty....

  24. #24
    Don't know how the efi hooks up, but for my Holley, I just turned the carb around backwards on the manifold, and ran the stock cable around the front of the carb. Works great, is cheap, and takes the extreme "S" curve out of the cable.

    Sometime simple if the best route to take.

    Ralph

  25. #25
    What "style" cable is the FFR supplied, Ford, Universal, etc.? And does anyone know if a Quick Fuel carb is comparable to a Holley 4150/4160 style?
    MK4 #9121 - Complete kit - Stroked 351, T5x, 3.55 Rear End, 3-Link - Picked up 6/17/17

  26. #26
    Forte mechanical throttle linkage all the way. I originally tried the FFR pedal but somehow it kept binding the throttle wide open. Not good. The Russ Thompson pedal solved all that. I did gave to purchase 2 shaft collars that didn't come with the linkage from Forte's. Made install a breeze. Very good response.
    JRL16
    Mk4 delivered 4/28/16. First start 10/15/16. First gocart 11/10/16. Engine Factory 427W. 750 carb. Tremec TKO600. 2015 IRS. Power steering. Whitby power brakes. Wilwood brakes. 18" wheels. Falken tires. Sway bars front and rear. Forte hydraulic clutch and mechanical throttle linkage. Scott's Hot Rods triple reservoir. Ceramic coated headers. Gasín sidepipes. Heated seats. Herb Fraser walnut door panels. Wipers. Console.

  27. #27
    I made mine from McMaster parts list that I found on the other forum. It was easy to do and install. I have a sturdy firewall forward, so that helped with the rigid mounting needed. I've had to move wire looms away from the linkage, but otherwise, no problems yet.

    Happy with the look and it works great. I didn't try the cable before doing this. I've always liked the look of the linkage

    Mechanical Linkage photos


    20170923_220513 by D. R., on Flickr
    Dave
    Mk 3.1 - #6882 - 5.0L 302 - FiTech EFI - 3-Link - 3.08 Ratio - 15" Wheels
    Greenhorn and doing the best I can
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