My car fall on its face at the 1000 ft? UPDATE
#1047936
08/06/11 12:55 AM
08/06/11 12:55 AM
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Joined: Jan 2004
Posts: 2,103 East Coast, NJ
fig426
OP
top fuel
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OP
top fuel
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
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Finally got the car to the track for the first time tonight. 528 hemi challenger, 10.3 compression, 630/618 lift, 295 duration, iron heads with some mild clean up work, factory intake opened up, 2 original hemi afb's, 2 1/8 headers, 3.5 collectors to about 18" of pipe to 3.5" aero chambers, 727 ,foot brake, 3500 converter, 4.30 geared dana, 29" tire. I made 3 passes tonight with it. It's 60 foot was 1.607, which I'm fine with since I was only leaving at about 2800rpm. I wanted to get a feel for the car a bit before I leave harder. It pulls well up to about the 1/8th and falls on its face at about the 1000 foot. I'm in 3rd before the 1/8. 1st and 2nd pull strong to about 6500 where I was shifting at. It doesn't break up or miss or anything, it just falls flat on it's face and stops pulling. My plugs look really good. Where do I start? I'm at a loss here. 7.4 at 92mph 1/8 and 11.95 at 96 mph was my best 1/4 of the 3 passes.
Last edited by fig426; 08/11/11 12:12 AM.
Chris from New Jersey
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Re: My car fall on its face at the 1000 ft? long
[Re: fig426]
#1047937
08/06/11 12:57 AM
08/06/11 12:57 AM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Sounds like its running out of fuel. What kind of fuel system do you have?
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: My car fall on its face at the 1000 ft? long
[Re: Triple Threat]
#1047939
08/06/11 01:06 AM
08/06/11 01:06 AM
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Joined: Jan 2004
Posts: 2,103 East Coast, NJ
fig426
OP
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OP
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Joined: Jan 2004
Posts: 2,103
East Coast, NJ
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Holley blue pump with 1/2 inch (8an) line to a high flow filter, I forget the make, to a regulator under the hood that splits with 2, 3/8 lines (6an) lines, 1 going to each carb.
Chris from New Jersey
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Re: My car fall on its face at the 1000 ft? long
[Re: fig426]
#1047940
08/06/11 01:08 AM
08/06/11 01:08 AM
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Joined: Jan 2004
Posts: 2,103 East Coast, NJ
fig426
OP
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OP
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Joined: Jan 2004
Posts: 2,103
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The fuel cell "output" fitting is 8 or 10an, I'm not sure, but the line at the cell is definately an 8 (1/2 inch).
Chris from New Jersey
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Re: My car fall on its face at the 1000 ft? long
[Re: Cab_Burge]
#1047942
08/06/11 01:28 AM
08/06/11 01:28 AM
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Joined: Jan 2004
Posts: 2,103 East Coast, NJ
fig426
OP
top fuel
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OP
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Joined: Jan 2004
Posts: 2,103
East Coast, NJ
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The pump is about 12" from the fuel cell, and below it. Cell in the trunk, pump under the trunk. The filter is on the subframe connector. The filter is pretty big and made to go after the pump and although I don't remember the make of it, I do remember the flow rate on it was really high. I have not flow tested the system. Guess I know what I'll be doing tomorrow morning. Any numbers I should be shooting for? Less than so many gallons per minute is bad? I ask because our local speed shop closes at noon so if I'm buying a pump, I have to get it figured out by then. I want to get back to the track Sunday!!
Chris from New Jersey
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Re: My car fall on its face at the 1000 ft? long
[Re: Mopar-Al]
#1047945
08/06/11 04:03 AM
08/06/11 04:03 AM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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master
Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
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no mention of fuel pressure ????
home of the Sox and Martin Hemi Duster
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Re: My car fall on its face at the 1000 ft? long
[Re: fig426]
#1047946
08/06/11 10:19 AM
08/06/11 10:19 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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3 things come to mind, flow test it, fuel pressure, and those carbs only have a single inlet and bowl and they do have a tendency to empty the bowl at high revs
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Re: My car fall on its face at the 1000 ft? long
[Re: fig426]
#1047948
08/06/11 10:33 AM
08/06/11 10:33 AM
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Joined: Oct 2005
Posts: 2,611 Elbridge, NY
Dart1031
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master
Joined: Oct 2005
Posts: 2,611
Elbridge, NY
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Quote:
The filter is on the subframe connector. The filter is pretty big and made to go after the pump and although I don't remember the make of it, I do remember the flow rate on it was really high.
I would try another filter between the cell and the pump. Your pump may not be strong enought to push the fuel through that filter. Also, because it's after the pump, you may have trash in the pump/lines(before the filter) hurting the flow.
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Re: My car fall on its face at the 1000 ft? long
[Re: MR_P_BODY]
#1047949
08/06/11 10:36 AM
08/06/11 10:36 AM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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check fuel pressure have 7 1/2 # and only slight drop off at w o t may think about alittle better pump for the hp you have going and the amout of draw on the fuel system, also just for giggles, check your vent , do not want a restriction there as well,
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Re: My car fall on its face at the 1000 ft? long
[Re: fig426]
#1047952
08/06/11 02:03 PM
08/06/11 02:03 PM
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Joined: Aug 2003
Posts: 43,214 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,214
Bend,OR USA
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If you can fill a one gallon container in under 30 seconds you should be good for a 11 second car, BG use to have a flow chart on thier website saying that a nine second car needed one gallon in or under 20 seconds, 10 second was, maybe, 25 seconds My memory is horrible, maybe someone else on here knows of another site that has flow numbers for testing and will post a link or say where to go to The comment on the needles and seats is very apprpriate, I have gone through that on many carbs, a .110 needle and seat would starve the motor according the wide ban and a .120 was more than enough Good luck, fix it before you burn the motor up In other words lift if it noses over
Last edited by Cab_Burge; 08/06/11 02:04 PM.
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Re: My car fall on its face at the 1000 ft? long
[Re: Dodgem]
#1047954
08/06/11 06:26 PM
08/06/11 06:26 PM
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Joined: Jan 2004
Posts: 2,103 East Coast, NJ
fig426
OP
top fuel
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OP
top fuel
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
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1 gallon in 45 seconds from the blue pump. Picked up a Holley 150 black pump today. It's flow rate is pretty good, came with a new regulator, and it's alcohol compatible if I ever decide to change over. Looking like rain for tomorrow so hopefully if it's dry Wednesday night I'll bring it up to Island for a few passes. http://www.holley.com/12-150.asp
Chris from New Jersey
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