DragStuff

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.

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

when its making power 7200. might turn more with a better carb. will call pro systems thx

x2 on pro systems carb, I got one on my 385 good carb

You wont regret calling pro systems. Good quality any customer support.

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.

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.

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!

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!

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.

Very nice!

damn good news

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...

Next try NGK sparkplugs. Autolites are hard to read. Foul easily, and just plain SUCK!

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.