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 QFT Q-850-B2 2x4 on 8-71 supercharged 572BBF street 
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Joined: Sun Oct 12, 2014 2:58 pm
Posts: 13
Anyone tuned a dual carb, blower setup with QFT's? How did they work for you? Any pointers? Do have a wb, but thought I could save a lot of effort hearing from previous experience from similar application.


Jetting from the spec sheet:
PMJ 76
SMJ 84
IAB 73/73
HSAB 33/33
PV 4.5
IFR's not specified

Thanks,
Janne


Sun Jun 18, 2017 10:47 am
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Joined: Mon May 15, 2017 4:04 pm
Posts: 80
I used to run a couple of Holley list 6109 750DP's on a 6-71 and a 355SBC. The first thing I would do would be to make sure the fuel pump and lines are up to the job. That was one of my first problems. The next or other first thing is to make sure the timing is squared away. I think you need more engine specific's before you ask for a tune also.


Sun Jun 18, 2017 7:17 pm
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Joined: Fri Feb 08, 2013 5:50 pm
Posts: 2357
You will want to lower the idle feed restrictions, tuning idle and light throttle is your biggest hurdle. Not 850's, I've done 2 sets of 750's and a set of billet 750 on E85. I boost referenced primary and secondary PV's, made linkage one to one.


Mon Jun 19, 2017 9:37 am
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