carb size
Moderator: John_Heard
carb size
i have a tube chassis cavalier 1/8 mile bracket footbrake car that has a 385 ci sbc. the carb on it now is a bg 825 race demon. the heads are pro topline 242cc w/ 2.125 intake valves.49cc comb chambers. a 686 640 lift bullet roller. 13.3 to1. 2 inch headers. car weighs 2350. 5800 conv. 5.38 gear. 2 things im trying to get,a tenth out of it and the car slows down in the evenings when it cools off. ive tried jetting it up. the carb came w/ 84 jets and i have run the best with 87s in it(6.00 @ 115) went to 88s it slowed. the car still slowed in cooler air w/87s. tech guy at bg told me to put 85s in it but it loses about 400 rpms. was thinking of going to a 1025 demon rs. the calculators say between 1043 cfm and 1150 cfm. any opinions are appreciated.
Re: carb size
What kind of rpm are you turning?
I've had better luck with the Holley HP's over the Demons although I have made Demons work very well. Demons seem to be very finicky with temp. changes. Holley's aren't near as much trouble to tune and keep tuned.
Give Patrick a call at Pro Systems and see what he can do for you. I have one of his Holley 1000 hp's on my 525 motor and love it.......
http://www.prosystemsracing.com/index1.html
I've had better luck with the Holley HP's over the Demons although I have made Demons work very well. Demons seem to be very finicky with temp. changes. Holley's aren't near as much trouble to tune and keep tuned.
Give Patrick a call at Pro Systems and see what he can do for you. I have one of his Holley 1000 hp's on my 525 motor and love it.......
http://www.prosystemsracing.com/index1.html
Blackhoodmafia!!!!
1972 Nova SS
572 C.I. BBC
Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs
1972 Nova SS
572 C.I. BBC
Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs
Re: carb size
when its making power 7200. might turn more with a better carb. will call pro systems thx
Re: carb size
x2 on pro systems carb, I got one on my 385 good carb
Re: carb size
You wont regret calling pro systems. Good quality any customer support.
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter
- jmarkaudio
- Posts: 278
- Joined: Fri Oct 26, 2007 4:22 pm
- Location: Florida
Re: carb size
http://www.jegs.com/i/Quick%20Fuel/793/ ... /-1?CT=999
All the metering is adjustable, and will allow you to keep the 4150 bolt pattern.
All the metering is adjustable, and will allow you to keep the 4150 bolt pattern.
Mark Whitener
____________
Good work isn't cheap and cheap work can't be good.
____________
Good work isn't cheap and cheap work can't be good.
Re: carb size
spoke to patrick at pro systems. he told me my bg fuel curve was probably off. so i have a 840 cfm 4150 coming from him. we will see how it does.
Re: carb size
hey forgot to let you guys know the results from my carb swap. i put it on my car did all the fine adjusting. didnt change anything else but that and a set of fresh autolites and the went from 6.18-6.20 to 5.96. been to the track with it twice ran 5.96 to 5.98 both weekends. pro systems are the true carb specialist!
Re: carb size
Damn dude that's awesome. for someone like me who's ignorant as to how to tune a Carb. You just can.'t beat Pro Systems. Liked it so much I bought two. Congrats on the nice gain.wfw70ss wrote:hey forgot to let you guys know the results from my carb swap. i put it on my car did all the fine adjusting. didnt change anything else but that and a set of fresh autolites and the went from 6.18-6.20 to 5.96. been to the track with it twice ran 5.96 to 5.98 both weekends. pro systems are the true carb specialist!
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter
Re: carb size
Very nice!
Blackhoodmafia!!!!
1972 Nova SS
572 C.I. BBC
Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs
1972 Nova SS
572 C.I. BBC
Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs
- slightly tweeked
- Posts: 55
- Joined: Wed Dec 01, 2010 11:21 pm
- Location: AZUSA CA,
Re: carb size
Glad to hear you guys had such great luck with PRO SYSTEMS.Friends of mine ordered them and put them on right out of the box and they ran great.Me I had hell with mine,put it on hooked up the fuel lines turned the pump on and it looked like a lawn sprinkler,Gas shooting every where.Took off the float bowls and they were full of aluminum shavings,Call Pat and gave him a little ass chewing but he did help me work it out and explained what had probably happened.After a lot of apoligies and some adjusting the carb runs great I guess I just got one of those freak ones...
72 Nova
548 cu in,900hp
Turbo 400
5600 stall
Ford 9in,457 gears
3640 lbs,all steel car.except hood.
Runs low 9s in 1/4.High 5s in 1/8.
548 cu in,900hp
Turbo 400
5600 stall
Ford 9in,457 gears
3640 lbs,all steel car.except hood.
Runs low 9s in 1/4.High 5s in 1/8.
-
- Posts: 74
- Joined: Sun Dec 19, 2010 5:24 pm
- Location: Ogden, Utah
Re: carb size
Next try NGK sparkplugs. Autolites are hard to read. Foul easily, and just plain SUCK!
Re: carb size
Predator. It'll run quicker and be more consistant. You'll also never have to guess on jets again.
732-367-8487. Ask for Dale.
732-367-8487. Ask for Dale.
Just another 10 second Camaro...
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