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#1 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Street Demon Experience for you guys
Ok, so I got a brand new phenolic body street demon carb (thermo quad). I had an Edelbrock Q-Jet on there before. I rebuilt the Q-Jet but it never ran right. Only one side would respond to mixture adjustments and I could never adjust the idle down past 850 when warm. I wasn't really happy with the dash pot choke either. I'm running 14 BTDC on basically a stock motor with mid-length headers, MSD billet distributor and a performer intake.
I hope my info helps someone with their install or decision. Putting the new carb on and getting dialed:
I gotta tell you, the seat-o-pants dyno is stoked. It hauls ass now and can smoke the tires (it wouldn't before), and chirp them in 2nd. I am a Q-Jet guy and usually have great luck with them (I build and tune carbs all the time), but this Edelbrock made one just never came around.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC Last edited by demian5; 03-30-2018 at 06:32 PM. |
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#2 |
Registered User
Join Date: Jan 2016
Location: Poway, CA
Posts: 356
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Re: Street Demon Experience for you guys
Great info! I recently did a similar swap but went with a speed demon instead. Lots of similar issues though; throttle linkage, PVC valve etc and I wish somebody like you would’ve posted all these great tips for my reference.
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1970 C-10 "Old Yeller" |
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#3 |
Registered User
Join Date: Aug 2015
Location: Las Vegas NV
Posts: 366
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Re: Street Demon Experience for you guys
I have a Demon 625 and it ran super rich out the box. I have the idle mixture screws about 3/4 turn open from completely closed. Have an AFR meter with dual O2s and it reads between 13.6 and 14.2 at idle, cruise and WOT. To me it seems crazy that the set screws are barely open, but the AFR is where it should be.
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Customization is what you want it to look like -- not what other people think it should look like |
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