2 step question
#1902961
08/31/15 04:07 AM
08/31/15 04:07 AM
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Joined: Mar 2009
Posts: 2,465 Sydney,Australia
tex013
OP
top fuel
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OP
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Sydney,Australia
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when using a 2 step on a auto trans BUT NO transbrake is it better to mat the throttle or not fully allowing for some accelerator pump shot ? been a long time since I used one , never ran it long enough to try . I am aiming for a more consistent light . I know everyone says go a brake but that is a big spend .Hoping the 2 step might give me some of that consistency . I do have the 2 step button mounted on my brake pedal above the pad any thoughts welcome
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 2 step question
[Re: tex013]
#1903062
08/31/15 12:01 PM
08/31/15 12:01 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Posts: 52,972
Romeo MI
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That would depend on the launch rpm... if you use a low rpm then you would need the pump shot.. if high rpm you have the air flow going already
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Re: 2 step question
[Re: cudadon]
#1903371
08/31/15 07:28 PM
08/31/15 07:28 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
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pro stock
Joined: Oct 2009
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North, Alabama
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Are you running in a electronics class? Around here we either run in Pro class (electronics/ Trans brake/ 2 step) or Foot brake class( no electronics of any kind, trans brake or 2 step).
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: 2 step question
[Re: tex013]
#1903383
08/31/15 07:40 PM
08/31/15 07:40 PM
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Joined: Mar 2009
Posts: 2,465 Sydney,Australia
tex013
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OP
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ok , I will be leaving 2200-2600 . that's all I can hold the brakes at easily . the class allows transbrake and 2 step . no delay box . looks like more testing thanks guys
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 2 step question
[Re: tex013]
#1907435
09/06/15 01:57 PM
09/06/15 01:57 PM
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Joined: Nov 2003
Posts: 2,131 New Lenox IL
cudadon
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ok , I will be leaving 2200-2600 . that's all I can hold the brakes at easily . the class allows transbrake and 2 step . no delay box . looks like more testing thanks guys
Tex I'm not sure if 2200-2600 will be enough rpm that you won't need some pumpshot when it comes off the 2 step. By cutting the engines torque while on the 2 step you MAY be able to go higher rpm than normal. Again testing is the key! You will have to find your "spot" on the starting line to know if you need more or less 2 step rpm for your reaction times. Don
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Re: 2 step question
[Re: tex013]
#1907585
09/06/15 07:36 PM
09/06/15 07:36 PM
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Joined: Mar 2009
Posts: 2,465 Sydney,Australia
tex013
OP
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OP
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thanks Don
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 2 step question
[Re: Leigh]
#1907675
09/06/15 10:26 PM
09/06/15 10:26 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Romeo MI
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I left @ 2150 on the 2 step. No problems. Was your foot on the floor.. thats pretty low rpm/ air flow to get away with no more pump shot.. ..to the OP... you may have to roll the pedal up to and just above the 2 step rpm so you still have a pump shot left... might even need a 50cc pump.. your gonna have to test
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Re: 2 step question
[Re: MR_P_BODY]
#1907734
09/06/15 11:15 PM
09/06/15 11:15 PM
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Joined: Mar 2009
Posts: 2,465 Sydney,Australia
tex013
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Posts: 2,465
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MrPeabody, that is what I am going to try . I do have 50cc pumps on my carb . Just no enough T&T here
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 2 step question
[Re: tex013]
#1907735
09/06/15 11:19 PM
09/06/15 11:19 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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MrPeabody, that is what I am going to try . I do have 50cc pumps on my carb . Just no enough T&T here
Tex I am talking a 50cc pump on the primary side... then you might need it on the secondary side also... I didnt do much foot brake racing because I couldnt hold it on the brakes on the line but my engine needed a lot of fuel on the hit
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Re: 2 step question
[Re: tex013]
#1907775
09/07/15 12:35 AM
09/07/15 12:35 AM
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Joined: Mar 2009
Posts: 2,465 Sydney,Australia
tex013
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both pumps are 50cc now I better get at it
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 2 step question
[Re: tex013]
#1907811
09/07/15 01:43 AM
09/07/15 01:43 AM
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Joined: Jan 2003
Posts: 2,158 Hamilton,Ohio
POZEST
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Hamilton,Ohio
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I've set mine between 1800-2300 worth my foot to the floor with no problem. Mallory hi fire ignition. 12.00 smallblock. Like others said, you're just gonna have to try it out.
"I'm not a Gynecologist, but I'll take a look."
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