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Anyone Running a Speed Demon?

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Old 04-14-2009, 04:41 PM   #1
Binnie77
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Default Anyone Running a Speed Demon?

If you are running a Speed Demon I would love to pictures of your accelerator linkage
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Old 04-14-2009, 05:00 PM   #2
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I bought every kind of adjustable and finally figure out that the smart thing to do is just make your own.

I don't have a picture. My car is in a body shop right now
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Old 04-14-2009, 05:10 PM   #3
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I have a 750 speed demon on my 1980. I didn't replace anything other than the Q-jet and intake when I installed it. I just bolted up the accelerator wire and the TV cable onto the speed demon, and it worked! I'll post some pictures later tonight for you.
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Old 04-14-2009, 05:24 PM   #4
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no pics but i just used the standard lokar cable and bracket and voila perfect.

it is on a th400 so no tv cable necessary but lokar has one of those as well
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Old 04-14-2009, 05:27 PM   #5
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Here is a picture of my present setup. The outside cable is cruise control and the inside one is throttle. If I didn't have to have that pair of return springs on the front, I would be happy with what I have. In order to get the carb to return to idle I have to have a fair tension on those return springs which in turn makes for a pretty stiff pedal. Maybe I should be looking for another problem as with both cables disconnected and the springs unhooked, the carb will not return to idle.

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Old 04-14-2009, 05:46 PM   #6
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Quote:
Originally Posted by Binnie77 View Post
If I didn't have to have that pair of return springs on the front, I would be happy with what I have. In order to get the carb to return to idle I have to have a fair tension on those return springs which in turn makes for a pretty stiff pedal. Maybe I should be looking for another problem as with both cables disconnected and the springs unhooked, the carb will not return to idle.
I have the idle problem too... same solution, lots of spring tension... oh well, gives the car the same feel as a euro sports car (my old Bimmer and my Dad's Jag both had rediculously heavy pedals).
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Old 04-14-2009, 05:48 PM   #7
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I want your carburetor also! nice
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Old 04-14-2009, 06:30 PM   #8
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Quote:
Originally Posted by BillysRed1980 View Post
I have the idle problem too... same solution, lots of spring tension... oh well, gives the car the same feel as a euro sports car (my old Bimmer and my Dad's Jag both had rediculously heavy pedals).
WOW, okay this is very reassuring. Over the weekend, I tuned my setup, and the only way I could get the carb to hit idle was to push the butterfly linkage forward by hand. It seems as though there is ever so much play in the throttle linkage, perhaps by way of a weak butterfly return spring, that prevents the carb from idling down from acceleration.

Which is really irritating me, because I got the darn thing to idle at 500RPM, thanks to a fully balanced rotating assembly and proper mixture with my new Wideband O2 sensor. After light accel, it settles down around 1000 RPM. I want the car to stumble back and forth, rocking me gently to sleep! I want to hear the individual cylinders firing, as it does at 500RPM!

I'll have to try the heavier return spring, I'm just using some cheap (read: expensive) Lokar setup right now.

the blonde weasel
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Old 04-14-2009, 10:19 PM   #9
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Quote:
Originally Posted by Binnie77 View Post
If you are running a Speed Demon I would love to pictures of your accelerator linkage
as promised... though later than I thought

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