2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

FD manifolds on FC

Thread Tools
 
Search this Thread
 
Old May 20, 2025 | 10:17 AM
  #1  
Cardinell's Avatar
Thread Starter
Rotatin'
 
Joined: Mar 2021
Posts: 383
Likes: 35
From: Virginia
FD manifolds on FC

Anyone running FD LIM and UIM on an FC: what throttle cable did you use? I'm using an FD cable, and throttle blades will only open to about 50% at WOT. If I adjust the cable so that it can open to 100%, the blades are propped open at idle
Reply
Old May 20, 2025 | 12:20 PM
  #2  
j9fd3s's Avatar
Moderator
Community Builder
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Mar 2001
Posts: 31,857
Likes: 3,243
From: https://www2.mazda.com/en/100th/
you can adjust the stop on the gas pedal. its 2 bolts to take the pedal off, and i think there is a stop that can be removed. and its adjustable
Reply
Old May 20, 2025 | 02:03 PM
  #3  
Cardinell's Avatar
Thread Starter
Rotatin'
 
Joined: Mar 2021
Posts: 383
Likes: 35
From: Virginia
Originally Posted by j9fd3s
you can adjust the stop on the gas pedal. its 2 bolts to take the pedal off, and i think there is a stop that can be removed. and its adjustable
I removed the stop bolt completely, and it still only opens to 50%. At WOT the pedal hits the floor
Reply
Old May 20, 2025 | 02:36 PM
  #4  
notanymore's Avatar
Rotary Evolution
Tenured Member: 5 Years
Community Builder
Liked
 
Joined: Apr 2017
Posts: 445
Likes: 137
From: in the swamp
the LIM isn't even near close to be able to bolt up nor are the ports remotely the same size, the UIM can fit with the adapters that are floating around.

most who use the FD UIM also use the FD throttle cable, since it's shorter and more appropriate. you could probably make a bracket though, but replacing the cable is about the same amount of work and less janky. i made my own bracket for the n/a cable because honestly i hate the stock TII cable(on a TII UIM/throttle body with cams flipped around).

a slightly less intrusive temporary fix would be to clamp a lead fishing weight under the cable end at the pedal to take up some of that slack. i haven't tried such a thing but i don't see why it wouldn't work.

Last edited by notanymore; May 20, 2025 at 03:40 PM.
Reply
Old May 20, 2025 | 08:43 PM
  #5  
Cardinell's Avatar
Thread Starter
Rotatin'
 
Joined: Mar 2021
Posts: 383
Likes: 35
From: Virginia
Originally Posted by notanymore
the LIM isn't even near close to be able to bolt up nor are the ports remotely the same size, the UIM can fit with the adapters that are floating around.

most who use the FD UIM also use the FD throttle cable, since it's shorter and more appropriate. you could probably make a bracket though, but replacing the cable is about the same amount of work and less janky. i made my own bracket for the n/a cable because honestly i hate the stock TII cable(on a TII UIM/throttle body with cams flipped around).

a slightly less intrusive temporary fix would be to clamp a lead fishing weight under the cable end at the pedal to take up some of that slack. i haven't tried such a thing but i don't see why it wouldn't work.
I have both UIM and LIM in my car, along with the FD cable. The issue I'm running into is as follows:

Cable is adjusted so there is almost no slack. At idle, throttle blades are all the way closed. At WOT, the blades only open about half way. It's almost like there's not enough travel in the FC pedal to open the throttle blades all the way.
Reply
Old May 21, 2025 | 10:48 AM
  #6  
j9fd3s's Avatar
Moderator
Community Builder
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Mar 2001
Posts: 31,857
Likes: 3,243
From: https://www2.mazda.com/en/100th/
Originally Posted by Cardinell
I have both UIM and LIM in my car, along with the FD cable. The issue I'm running into is as follows:

Cable is adjusted so there is almost no slack. At idle, throttle blades are all the way closed. At WOT, the blades only open about half way. It's almost like there's not enough travel in the FC pedal to open the throttle blades all the way.
i'd take the pedal off, i can't recall what i did exactly, but i'm running the same thing, and got it to work.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
GrossPolluter
2nd Generation Specific (1986-1992)
10
Mar 30, 2014 08:02 PM
thetech
20B Forum
1
Jul 31, 2007 05:39 PM
Kurgan
20B Forum
4
Jun 2, 2002 05:42 PM




All times are GMT -5. The time now is 12:24 PM.