Hey carb guys!

flyby84

New Member

Feb 22, 2009

48

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0

Arkansas

Feb 23, 2009

#1

• Feb 23, 2009

• #1

Alright...the combo I have in my sig works pretty good but I have noticed the exhaust from my car will choke you out! I have a stock Holley street avenger and was wondering if this is enough carb or should I get something else? Everyone I have talked to say I should pitch it in the trash...

 

asecretfile

New Member

Feb 11, 2007

228

0

0

Feb 23, 2009

#2

• Feb 23, 2009

• #2

flyby84 said:

Alright...the combo I have in my sig works pretty good but I have noticed the exhaust from my car will choke you out! I have a stock Holley street avenger and was wondering if this is enough carb or should I get something else? Everyone I have talked to say I should pitch it in the trash...

Click to expand...

what CFM do you have...570 670 770 870?

Might try running your mixture screws all the way in and then a turn and a half out as a starting point

 

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

15 Year Member

Nov 11, 2003

6,945

1,598

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Northern KY

Feb 24, 2009

#3

• Feb 24, 2009

• #3

If this is a 670 Street Avenger then it's not a bad carb for your combo...should run pretty stout. I'd say you just need to tune it a bit. Carb exhaust always smells a little more gamey than an EFI exhaust, especially if you don't have the emissions equipment and cats installed.

 

Wallzy

New Member

Aug 20, 2006

128

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Orlando, FL

Feb 24, 2009

#4

• Feb 24, 2009

• #4

Flyby84,

With that cam i would imagine you are making peak power around 5500-6500 RPM, and with your 306 you will be pulling 576cfm@6500rpm, 620cfm@7000rpm and 664cfm@7500rpm - when do you plan on shifting? Your peak cfm should be how you choose a carb becaue of the velocity to vacuum profile as air is drawn thru the venturi. Just remember in this case, bigger is not always better. Good luck!

Walz

 

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

15 Year Member

Nov 11, 2003

6,945

1,598

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Northern KY

Feb 24, 2009

#5

• Feb 24, 2009

• #5

^^ Keep in mind that just because a carb is labeled as a 650cfm, doesn't mean it actually flows that. What looks good on paper in a math formula doesn't always work out in the real world. I'd personally say a 650 is about perfect for his setup. With a 600 he may have slightly better throttle response (and i mean slightly) and slightly better bottom end (again, slightly) but he'll more than make up for it in the top end.

 

flyby84

New Member

Feb 22, 2009

48

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Arkansas

Feb 24, 2009

#6

• Feb 24, 2009

• #6

My stang pulls pretty hard with this combo! I shift at around 6k and I believe this is a 570cfm!
I am looking foward to running at the local 1/8th in a few weeks to see what it will turn.

 

RsStanG1987

I shaved all my pubes playing this game.

10 Year Member

Mar 13, 2004

569

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79

Dupont PA

Feb 25, 2009

#7

• Feb 25, 2009

• #7

Id also say the 650 is perfect for your setup. Im running pretty much the same setup and my exauhst smells pig rich..

 

D

DrMaxit

Founding Member

Nov 4, 2002

139

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Augsta GA

Feb 25, 2009

#8

• Feb 25, 2009

• #8

What jets are you running and what altitude are you at? Generally you should go down a jet size per 1700ft or so IIRC. The CFM on a carbs rating is aprox how much air it will flow, not how much fuel.

 

flyby84

New Member

Feb 22, 2009

48

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0

Arkansas

Feb 25, 2009

#9

• Feb 25, 2009

• #9

It has the stock jets in it right now...will be running about sea level at the track and I am about 1000 feet above right now!

 

93 LX

Founding Member

Jun 2, 2000

3,081

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Norwalk, CA.

Feb 25, 2009

#10

• Feb 25, 2009

• #10

why stock headers? Maybe they are killing your performance...

 

joel5.0

Member

Jun 15, 2004

429

2

18

Puerto Rico

Feb 25, 2009

#11

• Feb 25, 2009

• #11

What do the spark plugs say? LUK

 

flyby84

New Member

Feb 22, 2009

48

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0

Arkansas

Feb 25, 2009

#12

• Feb 25, 2009

• #12

The plugs look just a little bit on the rich side...not much just a little! I just haven`t bought headers yet,they are coming this summer. Looking into getting some longtubes. How much of a performance gain will I pick up with a decent set of LT`s?