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Drag Strip Issues (W.O.T. Cutout)

  • Thread starter Thread starter 70grande
  • Start date Start date Aug 28, 2009
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70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 28, 2009
#1
  • Aug 28, 2009
  • #1
So I took my car to the dragstrip for the first time today, and while I ran pathetic times, I had a blast. The only problem is that when I tryed to slam the pedal down, my car would sputter and start to stall out, so I never got better than an 11.5 on the 1/8 mile.

I cant figure out what could possibly be wrong. I would come up to the staging area, do a beastly burnout (with no problems of cutting out) and then line up. The, as soon as the tree turned green I would punch it out and the tires would spin a little, hook up, and then at about 40mph it just started to stall and sputter and backfire and pop and everything that would bring disrespect to a car at a dragstrip. It did this all three passes (with a bigger audience for each pass unfortunately). And, even when I let off the gas, it would stay in the disabled state, it felt/sounded like it wasn't even running on all cylindars. The only way I could get it out of this state was if I put the car in neutral (I have an A/T) and briefly put the car through full throttle, which it was perfectly capable of doing with no bogging down or poping or sputtering. After I did this, it would run like nothing had ever happened.


On my way home from the strip however, I was getting on the freeway and going from a rolling start of about 40, I punched it out and it slammed into overdrive and got all the way to 90 with no problems what-so-ever.

I cant figure out what on earth would cause this. Is it the fuel/air mix? Is it my timing, even though I have a Pertronix electronic ignition? What the hell is going on?

Thanks for the help!
 

blown65

Founding Member
Jul 7, 1999
1,938
4
39
Queen Creek Arizona
Aug 28, 2009
#2
  • Aug 28, 2009
  • #2
70grande said:
So I took my car to the dragstrip for the first time today, and while I ran pathetic times, I had a blast. The only problem is that when I tryed to slam the pedal down, my car would sputter and start to stall out, so I never got better than an 11.5 on the 1/8 mile.

I cant figure out what could possibly be wrong. I would come up to the staging area, do a beastly burnout (with no problems of cutting out) and then line up. The, as soon as the tree turned green I would punch it out and the tires would spin a little, hook up, and then at about 40mph it just started to stall and sputter and backfire and pop and everything that would bring disrespect to a car at a dragstrip. It did this all three passes (with a bigger audience for each pass unfortunately). And, even when I let off the gas, it would stay in the disabled state, it felt/sounded like it wasn't even running on all cylindars. The only way I could get it out of this state was if I put the car in neutral (I have an A/T) and briefly put the car through full throttle, which it was perfectly capable of doing with no bogging down or poping or sputtering. After I did this, it would run like nothing had ever happened.


On my way home from the strip however, I was getting on the freeway and going from a rolling start of about 40, I punched it out and it slammed into overdrive and got all the way to 90 with no problems what-so-ever.

I cant figure out what on earth would cause this. Is it the fuel/air mix? Is it my timing, even though I have a Pertronix electronic ignition? What the hell is going on?

Thanks for the help!
Click to expand...


Would it clear up after that one problem area? Or did it do it down track also? My guess is a fuel issue, I would think if it was ignition it would show up under load in the same area in each gear. How much fuel was in your fuel tank. Anyone see the runs and can say they were seeing smoke when it did it, or clean out the exhaust?
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 28, 2009
#3
  • Aug 28, 2009
  • #3
blown65 said:
Would it clear up after that one problem area? Or did it do it down track also? My guess is a fuel issue, I would think if it was ignition it would show up under load in the same area in each gear. How much fuel was in your fuel tank. Anyone see the runs and can say they were seeing smoke when it did it, or clean out the exhaust?
Click to expand...

So my buddy who was there says he thinks that there might have been white smoke but he wasn't really paying attention to it. I just filled up my tank before I got to the strip so I know it wasn't low on gas.
 
D

D.Hearne

New Member
Sep 29, 2000
11,730
6
0
south louisiana
Aug 28, 2009
#4
  • Aug 28, 2009
  • #4
Let me guess, you uncorked the headers at the strip ? Thru the full exhaust on the road ?
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 28, 2009
#5
  • Aug 28, 2009
  • #5
D.Hearne said:
Let me guess, you uncorked the headers at the strip ? Thru the full exhaust on the road ?
Click to expand...

Nope, it wasn't allowed, I ran the exhaust thru the mufflers, it sounds good enough for me anyways, I have spintechs on it.
 

blown65

Founding Member
Jul 7, 1999
1,938
4
39
Queen Creek Arizona
Aug 28, 2009
#6
  • Aug 28, 2009
  • #6
70grande said:
So my buddy who was there says he thinks that there might have been white smoke but he wasn't really paying attention to it. I just filled up my tank before I got to the strip so I know it wasn't low on gas.
Click to expand...

I would be looking at something with the fuel system IMO. Check your float levels would be a good start. Kinda odd at 40mph or so it shows up. I could see it close to right off the line. Not sure where your shift point is in relation to that issue, but if its close try shifting early. Really need some video.
 
6

67efivert

Member
Jan 26, 2003
348
0
16
lincolnton nc
Aug 28, 2009
#7
  • Aug 28, 2009
  • #7
check floats and fuel delivery ov launch fuel moves around alot and could be drawing air
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 28, 2009
#8
  • Aug 28, 2009
  • #8
Ok so a couple of you have suggested I check out my float level. I know where it is and how to adjust the level, but I dont know how to tell if I want it higher or lower. Anyone want to explain?
 

coolblue65

Founding Member
Jul 26, 1999
1,224
2
39
Algonquin, IL
Aug 28, 2009
#9
  • Aug 28, 2009
  • #9
check your fuel filter too
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 28, 2009
#10
  • Aug 28, 2009
  • #10
coolblue65 said:
check your fuel filter too
Click to expand...

I just put in a new fuel filter a couple weeks ago. I think it might be my tranny... When it goes into overdrive, it sometimes fails to shift up into the next gear, instead it just lets the engine rev all the way up and then it starts the cutting out and wont stop until I put it in neutral and rev it through once. It just pisses me off cause I've had the tranny rebuilt twice already, I though C4's were supposed to be beastly.
 

blown65

Founding Member
Jul 7, 1999
1,938
4
39
Queen Creek Arizona
Aug 28, 2009
#11
  • Aug 28, 2009
  • #11
70grande said:
I just put in a new fuel filter a couple weeks ago. I think it might be my tranny... When it goes into overdrive, it sometimes fails to shift up into the next gear, instead it just lets the engine rev all the way up and then it starts the cutting out and wont stop until I put it in neutral and rev it through once. It just pisses me off cause I've had the tranny rebuilt twice already, I though C4's were supposed to be beastly.
Click to expand...

They are if they are good transmissions. I have over 200 pass in the 10's on mine right now and it doesn't flare at all.

Guessing you have a Holley carb, but unscrew the plugs out of it, and set where it starts to get gas out of them. The clear ones I usually set just a bit below half way.
 

65ShelbyClone

Founding Member
Sep 9, 2000
4,675
38
119
Antelope Valley, SoCal
Aug 28, 2009
#12
  • Aug 28, 2009
  • #12
70grande said:
And, even when I let off the gas, it would stay in the disabled state, it felt/sounded like it wasn't even running on all cylindars. The only way I could get it out of this state was if I put the car in neutral (I have an A/T) and briefly put the car through full throttle, which it was perfectly capable of doing with no bogging down or poping or sputtering. After I did this, it would run like nothing had ever happened.

On my way home from the strip however, I was getting on the freeway and going from a rolling start of about 40, I punched it out and it slammed into overdrive and got all the way to 90 with no problems what-so-ever.
Click to expand...

The only difference I see between these two situations is that it didn't run badly on the rolling start, which implies to me that perhaps fuel slosh is causing a problem. Low float levels could cause the jets to be uncovered by fuel. High float levels can also cause flooding.
 
6

66forfun

Member
Feb 25, 2006
260
0
16
Pittsburgh
Aug 28, 2009
#13
  • Aug 28, 2009
  • #13
power valve issues maybe, sounds as if the problem happens when the engine is under load
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 28, 2009
#14
  • Aug 28, 2009
  • #14
66forfun said:
power valve issues maybe, sounds as if the problem happens when the engine is under load
Click to expand...

Oh ya, the problem is definitely under load, and all other times the car runs like a champ
 

iskwezm

10 Year Member
May 24, 2005
4,159
20
79
Rowland Heights,California
Aug 29, 2009
#15
  • Aug 29, 2009
  • #15
off topic, but where did you run at?
 
D

D.Hearne

New Member
Sep 29, 2000
11,730
6
0
south louisiana
Aug 29, 2009
#16
  • Aug 29, 2009
  • #16
70grande said:
I just put in a new fuel filter a couple weeks ago. I think it might be my tranny... When it goes into overdrive, it sometimes fails to shift up into the next gear, instead it just lets the engine rev all the way up and then it starts the cutting out and wont stop until I put it in neutral and rev it through once. It just pisses me off cause I've had the tranny rebuilt twice already, I though C4's were supposed to be beastly.
Click to expand...

How do you shift into overdrive with a C-4 ? C-4's aren't "beastly", in stock form they're quite fragile.
 
S

stonecoldtx

Member
Aug 4, 2007
214
2
18
Dallas, TX
Aug 29, 2009
#17
  • Aug 29, 2009
  • #17
D.Hearne said:
How do you shift into overdrive with a C-4 ? C-4's aren't "beastly", in stock form they're quite fragile.
Click to expand...

Good catch and good point! If you have an Overdrive, you don't have a C-4!

Also, it sounds as though there might be fuel feed issues . . . perhaps not enough volume to the carb.
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 29, 2009
#18
  • Aug 29, 2009
  • #18
iskwezm said:
off topic, but where did you run at?
Click to expand...

Irwindale Speedway in California
 

70grande

Member
Feb 3, 2009
56
0
6
San Diego, CA, 92115
Aug 29, 2009
#19
  • Aug 29, 2009
  • #19
stonecoldtx said:
Good catch and good point! If you have an Overdrive, you don't have a C-4!

Also, it sounds as though there might be fuel feed issues . . . perhaps not enough volume to the carb.
Click to expand...

Hmm interesting, I guess I never thought about that, I'll have to get underneath and figure out what has been put in there. I'm gunna start by adjusting the float's and see if that doesnt help.
 

12sec67

Active Member
Oct 6, 2003
1,301
1
36
San Diego, Ca
Aug 30, 2009
#20
  • Aug 30, 2009
  • #20
do you have jet extensions?
 
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