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Re: Going from Bigs 950hp to a Quick fuel 850. Jetting???
[Re: 440charger500]
#2309673
05/23/17 11:08 AM
05/23/17 11:08 AM
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Joined: Aug 2006
Posts: 610 long time lurker, short time p...
PorkyPig
mopar
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mopar
Joined: Aug 2006
Posts: 610
long time lurker, short time p...
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So i've been running a Bigs 950hp ported body with 1.42" venturi's my best results were with 76 pri jet 86 sec jet with 4.5 PV resulted in 11.50 et @ 115mph. So I got a smoking buy on a Quick fuel Q series 850hp & now trying to get it setup but was thinking if now I have 1.56" venturi shouldn't I need to increase jet size a bit more? You may not have bought what you think you did. A Q series 850 (no choke horn, right?) has a 1.40 venturi, not a 1.56". The Q series 950 is still only 1.45. Their 1050 is 1.59 from what I read. What does the Bigs 950 1.42 venturi look like? Pics?
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Re: Going from Bigs 950hp to a Quick fuel 850. Jetting???
[Re: 440charger500]
#2309741
05/23/17 01:21 PM
05/23/17 01:21 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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Exactly.
Forget the "rated" flow numbers for carbs...... They tell you basically nothing anymore.
Look at the Venturi and throttle bore diameters for comparisons.
For example..... Mighty Demon 850 Race Demon 1000 Race Demon RS 1025
All are 1.56 x 1.75....... Think there is a big(any??)flow difference there?
Holley- 0-9381 "850" = 1.56 x 1.75 Original HP "950" = 1.375 x 1.75 XP "950" = 1.600 x 1.75 Original HP "1000" 1.56 x 1.75
It's all marketing BS.
Between the Bigs 950 and a Q-850, I wouldn't really expect to see any on trac performance difference, unless one of them is doing a significantly better job of metering and atomizing the fuel, or gets the main circuit activated quicker so the car leaves harder. For practical purposes, they are basically the same "size".
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Going from Bigs 950hp to a Quick fuel 850. Jetting???
[Re: Thumperdart]
#2310020
05/23/17 09:49 PM
05/23/17 09:49 PM
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Joined: Jul 2009
Posts: 237 Redding,CA USA
440charger500
OP
enthusiast
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OP
enthusiast
Joined: Jul 2009
Posts: 237
Redding,CA USA
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You may not have bought what you think you did. A Q series 850 (no choke horn, right?) has a 1.40 venturi, not a 1.56". The Q series 950 is still only 1.45. Their 1050 is 1.59 from what I read. Porky you are correct on 1.40" venturi! The Marketing confusion & BS has got to my brain I guess. Yes its a Q series race carb with no choke horn. And if you're handy w/a drill and a tap I can walk ya through some additional stuff............. Yes Thumper I am handy at that! Let me know
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