Why does my Dart bog with a 2 step ???
#696966
05/13/10 10:03 AM
05/13/10 10:03 AM
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Joined: Jun 2009
Posts: 429
Sherman Texas
The Shocker
OP
mopar
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OP
mopar
Joined: Jun 2009
Posts: 429
Sherman Texas
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Last saturday i tried a 2 step box on the launch with the Tbrake and my Dart hated it.I treid several pills from 3200 to 3800 and every time same thing. Bog off the line for second then it would clear up and go.I ended up putting a 7000 pill in it so it wouldnt hit and the bog was gone and it instanlty ran faster in the 60' ,duh go figure  .I would like to use it for the convenience of it but dont know how to fix the problem as im new to Automatics and Transbrakes /2 steps (always ran 4 spds in the past)in dragcars.It seemed to me like it was loading up with gas while it was on the rev limiter IMO .Here is a vid to look at of what im talking about .Thanks  ... http://www.youtube.com/watch?v=ELN86EauBAc
Last edited by The Shocker; 05/13/10 10:04 AM.
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Re: Why does my Dart bog with a 2 step ???
[Re: The Shocker]
#696967
05/13/10 10:12 AM
05/13/10 10:12 AM
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Joined: Feb 2005
Posts: 2,528
Mansfield, Tx
Jacob Pitt
master
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master
Joined: Feb 2005
Posts: 2,528
Mansfield, Tx
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Are you using up all of your pump shot?
2013 NHRA D4 Stock Champ
#4 in the World IHRA Stock
2x IHRA Div.4 Stock Champ
14x Track Champ
All using a Ultimate Converter Concepts converter. Call Lenny today 704-892-6837
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Re: Why does my Dart bog with a 2 step ???
[Re: CHAPPER]
#696972
05/13/10 01:46 PM
05/13/10 01:46 PM
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Joined: Jan 2004
Posts: 368
Detroit,MI
BADDART
enthusiast
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enthusiast
Joined: Jan 2004
Posts: 368
Detroit,MI
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Isn't your foot on the floor with the 2-step on? That negates the pump shot. My car bogged the same way so I kept raising the 2-step rpm until I got a clean leave.I now intend to keep raising the rpm until the 60' goes away or tires spin.  Chris
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Re: Why does my Dart bog with a 2 step ???
[Re: 77DragracerR/T]
#696974
05/13/10 05:28 PM
05/13/10 05:28 PM
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Joined: Jan 2003
Posts: 3,616
Riverside, Ca
G_bob
master
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master
Joined: Jan 2003
Posts: 3,616
Riverside, Ca
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Quote:
My car works best with a low rpm 2 step and still having a pump shot.1.41 best 60' and it also helps me with my RT as i foot brake with the 2 step.
So you're not flooring it and relying on the two-step to hold the low RPM? Or do you mean setting it for low RPM and just pressing enough throttle until the two-step kicks in?
My converter flashes 6000 and I have my two-step set at 3000. It leaves harder that way than it did with the 2 step at 4800. 1.45 60's before, 1.39's now.
I mat it at the first amber and let the two-step and trans brake handle the rest. Let off the brake button on the last amber.
Never had a problem with bog or stumbling or delays lauching though. Not now with the 1050 dominator on this motor, or with the 950hp on the previous motor.
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Re: Why does my Dart bog with a 2 step ???
[Re: 77DragracerR/T]
#696975
05/13/10 07:31 PM
05/13/10 07:31 PM
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Joined: Jun 2009
Posts: 429
Sherman Texas
The Shocker
OP
mopar
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OP
mopar
Joined: Jun 2009
Posts: 429
Sherman Texas
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Quote:
What did you have the 2 step set at? If it's too close to the rev limiter it will break down.
3800 pill in the Tbrake side and a 7000 for the fail safe side ,bog .Next run 3600 in the Tbrake side same thing, bog .Third run 3400 Tbrake again, bog.4th and 5th run 7000 pill in Tbrake side (so it wouldnt hit) and 7000 fail safe side both ,no bog and great 60 foots .This was with me leaving at 3800 manually holding it there then stomping the throttle the rest of the way and dropping the button at the same side ...
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Re: Why does my Dart bog with a 2 step ???
[Re: G_bob]
#696979
05/14/10 08:26 PM
05/14/10 08:26 PM
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Joined: Apr 2003
Posts: 1,613
Burlington,Ont.
77DragracerR/T
top fuel
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top fuel
Joined: Apr 2003
Posts: 1,613
Burlington,Ont.
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Quote:
Quote:
My car works best with a low rpm 2 step and still having a pump shot.1.41 best 60' and it also helps me with my RT as i foot brake with the 2 step.
So you're not flooring it and relying on the two-step to hold the low RPM? Or do you mean setting it for low RPM and just pressing enough throttle until the two-step kicks in?
My converter flashes 6000 and I have my two-step set at 3000. It leaves harder that way than it did with the 2 step at 4800. 1.45 60's before, 1.39's now.
I mat it at the first amber and let the two-step and trans brake handle the rest. Let off the brake button on the last amber.
Never had a problem with bog or stumbling or delays lauching though. Not now with the 1050 dominator on this motor, or with the 950hp on the previous motor.
Yes i set the 2 step at 2400 and just give it enough gas that the 2 step comes on and the rest is a pump shot from the carb.I don't have a trans brake,i just foot brake.I had the 2 step set at 3600 before and the 60' were at 1.47.But it wasn't till i was on a slippery track that i had to turn it down and found the car really liked it.I hope to get out this Sunday and see how things are working for this year.
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Re: Why does my Dart bog with a 2 step ???
[Re: Quicktree]
#696980
05/14/10 08:35 PM
05/14/10 08:35 PM
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Joined: Jun 2009
Posts: 429
Sherman Texas
The Shocker
OP
mopar
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OP
mopar
Joined: Jun 2009
Posts: 429
Sherman Texas
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Quote:
theres a huge difference between a hesitation(lean) and a bog (rich)you may be loading the motor up with to much fuel on the 2 step. if it's not hesitating right when you hit the throttle it's probably not lean.
That is what it seems like from the drivers seat IMO.It feels like its loading up with gas and is taking a split second to clear out once i let it of the rev limiter.It makes sense that it would be loaded with fuel with the elec. pump running full steam at 8 psi ,throttle is wide open with mechanical secondaries ,but yet the motor is only spinning at 3800 ,and its getting 6000 plus worth of fuel in the plenum .If this is the case ,how do i fix it or improve it ???
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Re: Why does my Dart bog with a 2 step ???
[Re: Quicktree]
#696981
05/14/10 08:41 PM
05/14/10 08:41 PM
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Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
10 o to go
"Happy Don"
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"Happy Don"
Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
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As others said the 2 step is on the floor and you would have used up the pump shot. Might be using alot of fuel on WOT set floats little higher .If its bogging just on leave jet extentions might be needed .Wheres your timing ?Without using pumps might need to get more low end power in timing . The fuel pump theory doesn't seem right needle seat will hold fuel from coming unless its needed .But it might need it wot on the launch or other say might be fat . Don
Last edited by 10 o to go; 05/14/10 08:49 PM.
2009 418" build dan smith built
new 9.96 131.82
6.23 108
1.30 60 foot
best to date 9/15/09
8in 727 430 dana 2860 lb 3040 lb w driver
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Re: Why does my Dart bog with a 2 step ???
[Re: The Shocker]
#696982
05/14/10 08:44 PM
05/14/10 08:44 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
theres a huge difference between a hesitation(lean) and a bog (rich)you may be loading the motor up with to much fuel on the 2 step. if it's not hesitating right when you hit the throttle it's probably not lean.
That is what it seems like from the drivers seat IMO.It feels like its loading up with gas and is taking a split second to clear out once i let it of the rev limiter.It makes sense that it would be loaded with fuel with the elec. pump running full steam at 8 psi ,throttle is wide open with mechanical secondaries ,but yet the motor is only spinning at 3800 ,and its getting 6000 plus worth of fuel in the plenum .If this is the case ,how do i fix it or improve it ???
well it would have to be to much pump shot ot to much main jets. I would try smaller squirters first to see if that makes a difference. the smaller squirter will give you the same volume but over a longer period of time. vs just dumping the fuel at the hit. trial and error is the only way to find out unless you have something to monitor the fuel. like a chassis dyno or LM1
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Re: Why does my Dart bog with a 2 step ???
[Re: Quicktree]
#696983
05/14/10 08:52 PM
05/14/10 08:52 PM
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Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
10 o to go
"Happy Don"
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"Happy Don"
Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
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but on WOT thats all not used .
I even had my excellerator pump off for years.
Now if i foot braked someday then some adjusting would have to be done .
Dr
Last edited by 10 o to go; 05/14/10 08:53 PM.
2009 418" build dan smith built
new 9.96 131.82
6.23 108
1.30 60 foot
best to date 9/15/09
8in 727 430 dana 2860 lb 3040 lb w driver
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Re: Why does my Dart bog with a 2 step ???
[Re: 10 o to go]
#696984
05/14/10 08:56 PM
05/14/10 08:56 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
but on WOT thats all not used .
I even had my excellerator pump off for years.
Now if i foot braked someday then some adjusting would have to be done .
Dr
thats true but he may be flooding it on the hit and not have time enough to recover.
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