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Bad Launch with 572 ! up -down up -down !
#2493623
05/08/18 01:39 PM
05/08/18 01:39 PM
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Joined: Mar 2014
Posts: 195
Italy
Raffaplymouth60
OP
member
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OP
member
Joined: Mar 2014
Posts: 195
Italy
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Hi Guys .. yesterday tried first time my new 572 .. but some problem with or without nitrous ... at Launch engine go up down... up down ... RPM ! look like bad converter stall ... any idea ?
1970 Cuda 496 street driven 9.22@150
1971 Demon 572 7.82@176
1957 Desoto Adventurer Convertible 345 Hemi
1958 Plymouth Fury Christine
2008 Dodge Ram 1500 Hemi
1970 Dodge ChallengerRT 6pack 4 speed 1 of 135
1968 Dodge Charger RT 4 speed
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Re: Bad Launch with 572 ! up -down up -down !
[Re: Raffaplymouth60]
#2493693
05/08/18 04:54 PM
05/08/18 04:54 PM
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Joined: Jun 2004
Posts: 372
Western NY
maxi426
enthusiast
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enthusiast
Joined: Jun 2004
Posts: 372
Western NY
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If carbureted check float levels, or rear jets getting uncovered. If EFI and stock tank, possibly fuel pickup in tank getting uncovered?
Last edited by maxi426; 05/08/18 07:09 PM.
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Re: Bad Launch with 572 ! up -down up -down !
[Re: maxi426]
#2493694
05/08/18 05:07 PM
05/08/18 05:07 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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If carburated check float levels, or rear jets getting uncovered. If EFI and stock tank, possibly fuel pickup in tank getting uncovered?  Sounds like a fuel delivery issue to me.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Bad Launch with 572 ! up -down up -down !
[Re: maxi426]
#2493820
05/09/18 12:28 AM
05/09/18 12:28 AM
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Joined: Apr 2005
Posts: 1,505
TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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If carbureted check float levels, or rear jets getting uncovered. If EFI and stock tank, possibly fuel pickup in tank getting uncovered? Sounded like fuel issue to me too.
Old Geezer Racing
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Re: Bad Launch with 572 ! up -down up -down !
[Re: Raffaplymouth60]
#2493867
05/09/18 09:26 AM
05/09/18 09:26 AM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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SEEMS MORE LIKE CHASSIS IS LOADING AND UNLOADING?????
JAKES AUTOMOTIVE
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Re: Bad Launch with 572 ! up -down up -down !
[Re: maxi426]
#2493937
05/09/18 01:35 PM
05/09/18 01:35 PM
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Joined: Mar 2014
Posts: 195
Italy
Raffaplymouth60
OP
member
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OP
member
Joined: Mar 2014
Posts: 195
Italy
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If carbureted check float levels, or rear jets getting uncovered. If EFI and stock tank, possibly fuel pickup in tank getting uncovered? yep is 1050 Dominator ! when i have checked bowl level and was ok but after pass the rear bowl was low .. but after 5 minute when come back at my box was ok ... very strange ....Fuel Pump is Aeromotive A2000 all 10AN Fuel Line ... im also think the problem is possible on furl line issue
1970 Cuda 496 street driven 9.22@150
1971 Demon 572 7.82@176
1957 Desoto Adventurer Convertible 345 Hemi
1958 Plymouth Fury Christine
2008 Dodge Ram 1500 Hemi
1970 Dodge ChallengerRT 6pack 4 speed 1 of 135
1968 Dodge Charger RT 4 speed
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Re: Bad Launch with 572 ! up -down up -down !
[Re: sgcuda]
#2493938
05/09/18 01:36 PM
05/09/18 01:36 PM
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Joined: Mar 2014
Posts: 195
Italy
Raffaplymouth60
OP
member
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OP
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Joined: Mar 2014
Posts: 195
Italy
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Sounds like fuel, but I'd like to see a side shot of the run to check for any wheel hop. im working for put a video from Side
1970 Cuda 496 street driven 9.22@150
1971 Demon 572 7.82@176
1957 Desoto Adventurer Convertible 345 Hemi
1958 Plymouth Fury Christine
2008 Dodge Ram 1500 Hemi
1970 Dodge ChallengerRT 6pack 4 speed 1 of 135
1968 Dodge Charger RT 4 speed
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Re: Bad Launch with 572 ! up -down up -down !
[Re: an8sec70cuda]
#2493939
05/09/18 01:38 PM
05/09/18 01:38 PM
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Joined: Mar 2014
Posts: 195
Italy
Raffaplymouth60
OP
member
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OP
member
Joined: Mar 2014
Posts: 195
Italy
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If carburated check float levels, or rear jets getting uncovered. If EFI and stock tank, possibly fuel pickup in tank getting uncovered? Sounds like a fuel delivery issue to me. hi ! im Race with Old 496 Combo from 10 years ... never problem .. 9.2@150 ... with new 572 .. the ET drop to 9.6 9.8 with this problem
1970 Cuda 496 street driven 9.22@150
1971 Demon 572 7.82@176
1957 Desoto Adventurer Convertible 345 Hemi
1958 Plymouth Fury Christine
2008 Dodge Ram 1500 Hemi
1970 Dodge ChallengerRT 6pack 4 speed 1 of 135
1968 Dodge Charger RT 4 speed
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Re: Bad Launch with 572 ! up -down up -down !
[Re: Raffaplymouth60]
#2494022
05/09/18 04:48 PM
05/09/18 04:48 PM
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Joined: Aug 2003
Posts: 43,126
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,126
Bend,OR USA
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Are you hitting the NOS on that run with that surging?
How about a piece of fuel line on the front fuel bowl vent to route any splashed or sloshed fuel away from the carb opening?
Do you have jet extensions on the rear jets?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Bad Launch with 572 ! up -down up -down !
[Re: Raffaplymouth60]
#2494038
05/09/18 05:23 PM
05/09/18 05:23 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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You have a chassis issue. It's not out of fuel. It's loading and unloading the rear tires.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Bad Launch with 572 ! up -down up -down !
[Re: madscientist]
#2494075
05/09/18 07:10 PM
05/09/18 07:10 PM
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Joined: Mar 2014
Posts: 195
Italy
Raffaplymouth60
OP
member
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OP
member
Joined: Mar 2014
Posts: 195
Italy
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You have a chassis issue. It's not out of fuel. It's loading and unloading the rear tires. i had this suspension setting from many years .. Caltracs, Dana 60,monoleaf ..i have onky swap the engibe from 496 to 572 .. same transmission same axle ... same tires only change Engine .. the only difference is the weight .. 572 weight is 80 lb more than 440 block .. i think ..you think this can cause unloading rear tires?
1970 Cuda 496 street driven 9.22@150
1971 Demon 572 7.82@176
1957 Desoto Adventurer Convertible 345 Hemi
1958 Plymouth Fury Christine
2008 Dodge Ram 1500 Hemi
1970 Dodge ChallengerRT 6pack 4 speed 1 of 135
1968 Dodge Charger RT 4 speed
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Re: Bad Launch with 572 ! up -down up -down !
[Re: Cab_Burge]
#2494076
05/09/18 07:14 PM
05/09/18 07:14 PM
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Joined: Mar 2014
Posts: 195
Italy
Raffaplymouth60
OP
member
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OP
member
Joined: Mar 2014
Posts: 195
Italy
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Are you hitting the NOS on that run with that surging?
How about a piece of fuel line on the front fuel bowl vent to route any splashed or sloshed fuel away from the carb opening?
Do you have jet extensions on the rear jets? Hi ! i dont understand how put a piece of fuel line .. from bowl vent to ?? i don't have Fuel Jet extension..
1970 Cuda 496 street driven 9.22@150
1971 Demon 572 7.82@176
1957 Desoto Adventurer Convertible 345 Hemi
1958 Plymouth Fury Christine
2008 Dodge Ram 1500 Hemi
1970 Dodge ChallengerRT 6pack 4 speed 1 of 135
1968 Dodge Charger RT 4 speed
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Re: Bad Launch with 572 ! up -down up -down !
[Re: Raffaplymouth60]
#2494081
05/09/18 07:28 PM
05/09/18 07:28 PM
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Joined: Mar 2007
Posts: 69
Palm City, FL
Dadodgekid
member
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member
Joined: Mar 2007
Posts: 69
Palm City, FL
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So everything stayed the same from your 496 to the 572? whats your idle fuel pressure set to? I hear engine surge... timing or fuel. rear tire is planted pretty good in your video. Almost sounds like the converter is too tight??
Last edited by Dadodgekid; 05/09/18 07:31 PM.
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