Soo slow!

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cammed89lx

New Member

Oct 25, 2010

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Mar 3, 2011

#1

• Mar 3, 2011

• #1

Hello everybody. My car feels VERY slow even though its semi built. So my car is a brand new 306 with an f 303 cam, afr 165's, KB pistons, Rpm airgap intake, 650 edelbrock carb, 10.5.1 comp ratio, so with all of this i would guess i would be in the 300whp range, give or take 10hp. But my car feels slower than a 89 accord(seriously). The whole motor has less than 5K miles on it. Recent oil change, and brand new spark plugs. The fuel regulator pressure is set at 4psi,which is what edelbrocks run at if im thinking correctly. anyway, what could be the issue, the only thing i could think of(but not sure) is that the car was originally a 4 cyl. car, so it may have really high gearing, But i dont know what the 4 cyl. come with anyways. But if anyone has ideas or suggestions they would be appreciated. The car is currently untuned, but i think it would need more than a tune to wake it up. Thanks again

 

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cheese_05_70

New Member

Aug 29, 2005

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IL

Mar 3, 2011

#2

• Mar 3, 2011

• #2

im not a carb guy but i thought fuel pressure should be 6 to 7. what do your plugs look like and what number are they?

 

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cammed89lx

New Member

Oct 25, 2010

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Mar 3, 2011

#3

• Mar 3, 2011

• #3

the plugs were pretty chalky and black. and they are autolite. i forget the # but literally just changed them 2 days ago. and to add onto the annoyingness, driving today in 4th and attempted to get on it the motor just sputters, and exhaust just backfires like crazy. So thats another unknown...

 

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cammed89lx

New Member

Oct 25, 2010

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Mar 3, 2011

#4

• Mar 3, 2011

• #4

and holleys take 7ish, but i think edelbrocks take 4, i changed the plugs because i changed the carb from a holley to an edelbrock.

 

LarsD

Founding Member

Jul 2, 2002

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Mar 3, 2011

#5

• Mar 3, 2011

• #5

4psi is too low. From Edelbrock's web site:
http://www.edelbrock.com/automotive_new/misc/tech_center/install/carb_faq.shtml

Q: I see fuel dripping from the carburetor boosters at idle, what causes this?

A: Too much fuel pressure usually causes this and often times dirt in the float bowls can do the same. Make sure your fuel pressure does not exceed 6.0 psi, optimum pressure is 5.5 psi.

Click to expand...

That being said, something is set wrong on the carb if the plugs are black.

 

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cammed89lx

New Member

Oct 25, 2010

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Mar 3, 2011

#6

• Mar 3, 2011

• #6

ok, im going to set it to 5.5 and see if it fixes anything.

 

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BIGDATOWN

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Dec 3, 2010

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Mar 3, 2011

#7

• Mar 3, 2011

• #7

I would try setting the timing correctly before doing anything!

 

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cammed89lx

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Oct 25, 2010

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Mar 3, 2011

#8

• Mar 3, 2011

• #8

The timing was set at 34 degrees at the time of the build. and im afraid to set the timing because im obviously not a professional, so id probably mess something up. and would i need a dyno to get correct/best timing for my car.

 

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cammed89lx

New Member

Oct 25, 2010

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Mar 8, 2011

#9

• Mar 8, 2011

• #9

set to 5.5 but still pops, and sputters. but only sometimes. been driving it around seeing if it will change but pops and sputters a lot for about 10 minutes after warm up. then it will go away. and i need to get the timing set.

 

Wildstringer

New Member

Feb 20, 2011

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Mar 8, 2011

#10

• Mar 8, 2011

• #10

Advance the timing until its just starts to ping that back it off just a little. Is the Edelbrock new or used. I have gotten into the habit of believing half of what I see and none of what I hear. Just because they say "it has just been rebuilt", that doesn't mean it was rebuilt correctly. How long after it was rebuilt did it sit on a shelf filling up with dirt and dust.

 

LarsD

Founding Member

Jul 2, 2002

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Mar 8, 2011

#11

• Mar 8, 2011

• #11

I would get an adjustable timing light and set the timing properly. If you do the "listen and back off method" you can still be experiencing pre-ignition knock and just not be able to hear it.

 

jgarrard

Member

Apr 3, 2010

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Gadsden,Al

Mar 8, 2011

#12

• Mar 8, 2011

• #12

Go buy you a timing light and get somebody to teach you how to use it. The first time I tryed to use one I was lost but learned fairly quick. 34 degrees????

 

tannerc91gt

This last 25% is foreign territory at this point

Founding Member

Nov 29, 1999

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Indiana

Mar 8, 2011

#13

• Mar 8, 2011

• #13

Adjust the carb/timing and see where it gets you, just like everyone is saying. Maybe, just maybe, its just not fast But saying its as slow as an accord is a pretty serious issue

 

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cammed89lx

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Oct 25, 2010

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Mar 10, 2011

#14

• Mar 10, 2011

• #14

Thank you for all of the responses. and i will definately have to get a timing light. and i the person i bought the carb off of said it only had about 3000 miles on it, the motor it was on need a bigger carb. It looks like it only has 3000 on it too. all pieces of carb are intact and functional. seems to be perfectly functional and everything. THank you for your respones.