Stumble off the 2 step

Ron Gusack · 08-28-2019, 07:44 PM

I've been trying to make a 4 wheel line lock with delay box work but the car feels fat right at the hit. I've moved the 2 step from 26 to 29 with the same results. My AFR looks lean and I know a miss will look lean with an O2 but I decided to go way up in main jet. I went from 90 to 94 and it felt a little better but the 60 was slow, 1.393. Next run, with no changes, I foot braked it and the 60 was 1.297. I've been using a 3 circuit Dominator with timing at 35 and 39. Any help greatly appreciated.

gmonde · 08-28-2019, 10:48 PM

believe it or not foot braking will result in a better 60' in a low stall converter due to the fuel that is in turbulenced and floating in the intake ,,,as far as O2 readings doing low 2 step you will not gain any info ,,

Alan Nyhus · 08-29-2019, 07:55 AM

Quote:

Originally Posted by Ron Gusack

I've been trying to make a 4 wheel line lock with delay box work but the car feels fat right at the hit.

Couple of questions:
- Why the four wheel line lock? You could have release issues making the car 'tight'.
- Have you tried the two step rpm at the foot brake rpm that gives you the better 60 ft?

Duane Eiskant II · 08-29-2019, 08:00 AM

Take the intermediate air bleed completely out of the front and rear in the carburetor and go back to the original main jet.

Keith 944 · 08-29-2019, 08:52 AM

Quote:

Originally Posted by gmonde

believe it or not foot braking will result in a better 60' in a low stall converter due to the fuel that is in turbulenced and floating in the intake ,,,as far as O2 readings doing low 2 step you will not gain any info ,,

i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored.

The Hawk · 08-29-2019, 10:48 AM

I run a dual line lock setup with a delay box on a pump gas 540 Chevy with a TH400, GM 8.5 rear with a 4.10 gear. The carb is a Holley 950 HP squared up at 87 with the power valves out. Timing is at 38 total. Two Step is chipped down to 2000 or so and the car is very consistent. Car is 3550# with me in it. Sixty foot times in the mid 1.5`s and runs 11.50`s with a D.A. of around 9500` in Denver. Car has no lag what so ever when it leaves.

Ron Gusack · 08-29-2019, 11:16 AM

gmonde
Re: Stumble off the 2 step
believe it or not foot braking will result in a better 60' in a low stall converter due to the fuel that is in turbulenced and floating in the intake ,,,as far as O2 readings doing low 2 step you will not gain any info ,,
I noticed that the converter flash was about 3k instead of the 5k I see when foot braking.

Couple of questions:
- Why the four wheel line lock? You could have release issues making the car 'tight'.
- Have you tried the two step rpm at the foot brake rpm that gives you the better 60 ft?
Four wheel line lock because I didn't want to shock the suspension, spend the money for a t-brake or pull the trans out without knowing that I'd like top bulb racing. I'm not sure how I'd deal with dragsters running 50 mph faster than me at the stripe. This was supposed to be more of a cheap test. I thought about the brake release as a possibility but I can hear the engine blubber, I think.

Take the intermediate air bleed completely out of the front and rear in the carburetor and go back to the original main jet.
I've got the intermediate pretty lean but I'll give this a try. I also have a 2 circuit 1050 that I could either swap entirely or pull the blocks off and make the 3 into a 2.

i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored.
I thought about this and was trying not to floor it until the 2nd light came on, but I keep letting go on the bottom bulb, LOL. Obviously I need work.

i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored.
Yes, I have a couple friends that race with 2 line locks and have zero issues, so I know this can be done.

Thank you all for the responses, they give me hope.

Keith 944 · 08-29-2019, 01:30 PM

i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored.
Yes, I have a couple friends that race with 2 line locks and have zero issues, so I know this can be done.

Thank you all for the responses, they give me hope.[/QUOTE]

Uuuummm yeah me too my 11.50 car Uses dual line locks on a two step and I have never had a stumble issue
sometimes I even disconnect the back two barrels to slow the car down and still no stumble.
Still sounds like you could use more fuel to take off with I would try the suggestion of taking out the intermediate bleeds see what happens then. Maybe a looser converter would help

Ron Gusack · 08-31-2019, 11:56 AM

Thanks Keith. Not sure when I'll be testing it again but it's helpful to get opinions on a line of attack. If I was coordinated enough to floor it after the tree was activated I might have enough pump shot left to fatten it a little. I also thought about the possibility of the delay box causing some kind of ignition problem.

08-28-2019, 07:44 PM	#1
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Stumble off the 2 step I've been trying to make a 4 wheel line lock with delay box work but the car feels fat right at the hit. I've moved the 2 step from 26 to 29 with the same results. My AFR looks lean and I know a miss will look lean with an O2 but I decided to go way up in main jet. I went from 90 to 94 and it felt a little better but the 60 was slow, 1.393. Next run, with no changes, I foot braked it and the 60 was 1.297. I've been using a 3 circuit Dominator with timing at 35 and 39. Any help greatly appreciated.

08-28-2019, 10:48 PM	#2
gmonde Senior Member Join Date: Nov 2007 Posts: 615 Likes: 56 Liked 165 Times in 59 Posts	Re: Stumble off the 2 step believe it or not foot braking will result in a better 60' in a low stall converter due to the fuel that is in turbulenced and floating in the intake ,,,as far as O2 readings doing low 2 step you will not gain any info ,,

08-29-2019, 08:00 AM	#4
Duane Eiskant II Senior Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 501 Likes: 261 Liked 57 Times in 33 Posts	Re: Stumble off the 2 step Take the intermediate air bleed completely out of the front and rear in the carburetor and go back to the original main jet. __________________ Duane Eiskant 1354 Stock/Super Stock

08-29-2019, 10:48 AM	#6
The Hawk VIP Member Join Date: Mar 2003 Location: Littleton,Colorado Posts: 1,194 Likes: 0 Liked 249 Times in 109 Posts	Re: Stumble off the 2 step I run a dual line lock setup with a delay box on a pump gas 540 Chevy with a TH400, GM 8.5 rear with a 4.10 gear. The carb is a Holley 950 HP squared up at 87 with the power valves out. Timing is at 38 total. Two Step is chipped down to 2000 or so and the car is very consistent. Car is 3550# with me in it. Sixty foot times in the mid 1.5`s and runs 11.50`s with a D.A. of around 9500` in Denver. Car has no lag what so ever when it leaves. __________________ Lane Weber It`s Not What You Drive That Wins....It`s How You Drive It Last edited by The Hawk; 08-29-2019 at 11:05 AM.

08-29-2019, 11:16 AM	#7
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Re: Stumble off the 2 step gmonde Re: Stumble off the 2 step believe it or not foot braking will result in a better 60' in a low stall converter due to the fuel that is in turbulenced and floating in the intake ,,,as far as O2 readings doing low 2 step you will not gain any info ,, I noticed that the converter flash was about 3k instead of the 5k I see when foot braking. Couple of questions: - Why the four wheel line lock? You could have release issues making the car 'tight'. - Have you tried the two step rpm at the foot brake rpm that gives you the better 60 ft? Four wheel line lock because I didn't want to shock the suspension, spend the money for a t-brake or pull the trans out without knowing that I'd like top bulb racing. I'm not sure how I'd deal with dragsters running 50 mph faster than me at the stripe. This was supposed to be more of a cheap test. I thought about the brake release as a possibility but I can hear the engine blubber, I think. Take the intermediate air bleed completely out of the front and rear in the carburetor and go back to the original main jet. I've got the intermediate pretty lean but I'll give this a try. I also have a 2 circuit 1050 that I could either swap entirely or pull the blocks off and make the 3 into a 2. i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored. I thought about this and was trying not to floor it until the 2nd light came on, but I keep letting go on the bottom bulb, LOL. Obviously I need work. i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored. Yes, I have a couple friends that race with 2 line locks and have zero issues, so I know this can be done. Thank you all for the responses, they give me hope.

08-29-2019, 01:30 PM	#8
Keith 944 VIP Member Join Date: Feb 2006 Location: Dela-where? Posts: 2,192 Likes: 1,159 Liked 1,873 Times in 576 Posts	Re: Stumble off the 2 step i would also add to this that when foot braking without a two step you use both squirters. sitting on a 2 step that extra fuel has been used as soon as it was floored. Yes, I have a couple friends that race with 2 line locks and have zero issues, so I know this can be done. Thank you all for the responses, they give me hope.[/QUOTE] Uuuummm yeah me too my 11.50 car Uses dual line locks on a two step and I have never had a stumble issue sometimes I even disconnect the back two barrels to slow the car down and still no stumble. Still sounds like you could use more fuel to take off with I would try the suggestion of taking out the intermediate bleeds see what happens then. Maybe a looser converter would help __________________ KEITH MAYERS 2-1/2 X somebody Still many X nobody

08-31-2019, 11:56 AM	#9
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Re: Stumble off the 2 step Thanks Keith. Not sure when I'll be testing it again but it's helpful to get opinions on a line of attack. If I was coordinated enough to floor it after the tree was activated I might have enough pump shot left to fatten it a little. I also thought about the possibility of the delay box causing some kind of ignition problem.