Wide open throttle

[inovermyhead]

Guys,
Just noticed that my throttle linkage only opens to approximately 75/80% of full when the pedal is fully down, no wonder I've been a little underwhelmed with the 3.5 swap!!
It's a RHD car so I have had the missus work the pedal while I look at all the moving bits, lots of play everywhere, a good 15/20mm just at the pedal before anything happens at all. With the pedal flat to the board there's 20 mm more to go at the throttle body.
One possible fix that might work is to remove and lengthen the vertical arm on the passenger side(RHD remember) to provide a longer lever, this will mean cutting and welding in an extra ?? mm, I'm thinking 20-30 mm should give more pull on the longer rod running horizontally to the plate/spring.

Anybody had similar issues or done any other mod to fix this problem.

Cheers. John

 

[kasbatts]

Hi John, Dont cut anything! I would work at getting as much slop and play out of the system as possible before you do anything drastic like that.

If the car is all standard (ie the linkage and throttle body, plenum chamber, intake runners etc it should all work.

You say you have 3.5, is all the intake and EFI standard (i.e, D Jet?)

 

[inovermyhead]

Motor is a M30B35 from an 89 735 with plenum and runners from original 3lt csi, modified fuel rail and injectors from a 635, the linkages are from the original car I think( also know that the car started life as an auto Cs ). It runs an aftermarket Microtronic ecu( piece o cr@p will be replaced soon) and had new wiring when it was installed. It actually runs fine but is not getting anything like full flow when giving it beans.

Cheers John

 

[kasbatts]

Ok, I would work on getting the play out of the system first, and then if still not right have a look at maybe moving where the rod that runs down the side of the engine block attaches to the pivoting plate on the side of the Engine.
If you move the ball of this joint away from the pivot point it will give more throw / movement to the vertical rod which should in theory open the throttle more.
They are tricky things throttle linkages, I'm in the middle of trying to get mine sorted as well after adding another link into the system as I have changed my throttle body to a 70mm V6 Commodore one.