Torque converter grab when idling in Drive

Hi Everyone, been quite a while since i have been on here.

I have had an issue with the idle on my 64 Coupe Deville ever since i have had it.

With the Idle set high enough that it is smooth, but still a nice idle, the RPM seems only slightly too high for the stall of the Torque Converter. And therefore it tends to sit there and grab and lunge a bit. So until now, i have been putting the car in Neutral at the lights to stop this happening.

I've had the car dyno tuned and they told me I need a higher stall RPM Torque Converter as they also could not get the car to run smooth enough at the recommended idle RPM.

Here in Australia i run 98 Octane and i installed a "smooth Idle" mild cam when rebuilding the engine. This was all purchased from Cad Company in Albuquerque along with the rebuild kit.

Until now i have assumed that the higher idle required is due to the the fuel i am running over here. 

Any thoughts or suggestions?

Thanks

Cliff

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Comment by Cliff Johnston on June 14, 2021 at 11:28pm

Hi Tony, thanks for your reply. That makes total sense.

After reading your reply I spoke to a local converter shop and they can modify my converter to whatever i need.

I will go down that path when i get around to pulling it out.

Cheers

Cliff

Comment by Tony and Ginny 429 on June 14, 2021 at 10:40pm

Cliff

Your issue is that your replacement cam is not allowing the engine to run at the 480 idle RPM the engine  and the trans was designed for and is requiring the higher rpm to run  the engine smooth 

As long as your idle is up higher than it should be  you will be engaging the torque converter — a given 

Not at all good to have your  trans and drive train working against you braking  system at a stop but using neutral is your best option if you cannot get your idle down 

What you are explaining has happened to me when I had my idle to high and  it needed to be reduced 

The octane you are using has no bearing on the problem as in America when these cars were new the octane was 105 and 35 cents a gallon ( I am older than you ) 

98 octane is as good as it gets as today

I run 93 octane from the pump with no issues ( higher octane is better to produce more power ) 

Sorry my news is not better 

Enjoy 

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