Rolling Roads and Sticking throttle

[chewy]

Does anyone know of any Rolling Roads where I could get the GTR tested? I live near Blackpool in the North West so nearer home the better. I would hope the car is putting out about 400BHP. I was happy with the cars performance having had nothing to compare it with but I got a second opinion off a fellow Ultima owner (who was bound to say it wasn't as fast as his) and he didn't think it was revving as freely as it should.
Following a recent trip to the factory for unrelated matters they rang me up to tell me they had changed the throttle linkage and told me that I was only getting half throttle. I was gob smacked and excited. Having now driven it again all I can say is WOW.
However whilst recently trying to scare a young female passenger I scared myself stupid as the throttle stuck on as I approached a T junction ----. On inspection butterfly was stuck open about 1mm but that was enough. I slackened off linkage and all ok but now have lost Full throttle again. I have tried adjusting it but am concerned that it may jam on again if I leave it to tight. Anyone else had similar problems?

[Steve_D]

I seem to remember others have had sticky throttle problems but they seemed to be related to engine bay temperature.
Steve

[jschwartz]

My throttle stuck. It was the cotter pin that holds the cable end clevis on to the pedal assembly. Seems that I had failed to bend the cotter pin all the way round, which after rotating to the exact position caught on the powder coated frame member at the front of the footwell.
jeff

[gdr]

Have you got decent throttle return springs? I bought a Moroso kit from Real Steel which looks OK and has two fairly strong springs. Also fitted a couple of springs on the pedal itself to take the weight of the pedal off the cable. I originally just had a single spring which was not very good - this is a long throttle cable and will may have a fair bit of drag regardless of lubrication and routing. And make sure you can always get at the ignition switch in a panic!

[andycanam]

My throttle used to stick open.... I played quite a lot with double springs but ended up with a larger one that had the right pressures at the right places i.e around 3lbs when shut etc...

Never had a problem since so it works well...

I did the same thing with the throttle... took people out in the first 1000miles who were inpressed... only for me to find the throttle wasn't opening the second throttles......

Rgds
andy

also known as Ultimaandy

[Stig]

Yup - me too!

Need stronger springs as the high engine bay temperatures cause the throttle to stick.

Another job on my list of 'To Do's

[davejw]

I had a sticky throttle because the alloy bracket above the pedal was flexing causing the cable to bind. It was replaced by a heavy steel item, alignment re-worked at carb with the effect being I was able to remove one of the two return springs! Light throttle without the stick. I also gave the cable an IV drip (upside down wine bottle trick) of good old GTX

Cheers,

Dave

>> Edited by davejw on Wednesday 13th August 13:14

[chewy]

I've been having another play with the throttle linkage this weekend and have come to the conclusion that it is the outer cable itself that is stretching when heated. I adjusted the cable a few times whilst cold or at normal running speed but when I started pushing the car harder resulting in Higher Engine Bay temperatures the cable was clearly several mm too short. When cool again the play in the cable had returned. So I've had to find a happy medium which does mean I have a bit of play before throttle comes on, unless anyone knows of any other cable I could use.