Front End Limiters and Reaction Time
#1072898
09/11/11 01:15 AM
09/11/11 01:15 AM
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Joined: May 2004
Posts: 12,418
Taxes & Virus's R-US, NY
Dragula
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Taxes & Virus's R-US, NY
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My brain says letting the front end of the car travel further before the suspension moves would give me a slower reaction time, but I swear reality is the opposite....Which gives a faster reaction time, limiters limiting or not limiting?
Oooh and a new best tonight 10.42 at +127mph....But we ran 1/8th but I got a 1/4 run in before they changed timers....I ran 6.63, 6.63, 6.63, 6.62 tonight...Bulbed it. Glad I haven't lost my lucky streak.
Last edited by Dragula; 09/11/11 01:43 AM.
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072899
09/11/11 02:39 AM
09/11/11 02:39 AM
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Joined: Aug 2003
Posts: 43,315
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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Quote:
My brain says letting the front end of the car travel further before the suspension moves would give me a slower reaction time, but I swear reality is the opposite....Which gives a faster reaction time, limiters limiting or not limiting?
Oooh and a new best tonight 10.42 at +127mph....But we ran 1/8th but I got a 1/4 run in before they changed timers....I ran 6.63, 6.63, 6.63, 6.62 tonight...Bulbed it. Glad I haven't lost my lucky streak.
This is one of those things that you have to try, maybe several different times depending on which track and track conditions  , on your vehicle to see what works the best  I have seen stiffer shocks slow reation times down on a NHRA Stocker that redlighted a lot Not so on shortening the front end travel on the same car 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072900
09/11/11 10:49 AM
09/11/11 10:49 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
My brain says letting the front end of the car travel further before the suspension moves would give me a slower reaction time, but I swear reality is the opposite....Which gives a faster reaction time, limiters limiting or not limiting?
Oooh and a new best tonight 10.42 at +127mph....But we ran 1/8th but I got a 1/4 run in before they changed timers....I ran 6.63, 6.63, 6.63, 6.62 tonight...Bulbed it. Glad I haven't lost my lucky streak.
Its dependent on how the front end acts now... if
it just yanks the front straight up or if it rolls forward
then up... what are you looking for... faster or slower
RTs
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072901
09/11/11 10:58 AM
09/11/11 10:58 AM
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Joined: Jan 2003
Posts: 5,898
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,898
Florida
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I never liked the idea of limiting front end travel with stops. Different shocks or setting worked well for me because traction is a priority. As for RT's, I adjusted tire size and fine tune with air pressure. I can't say for sure if limiters slow or speed up RT's because I never tried it. But my brain says limiters would speed up RT's a bit because it keeps the car from rotating/transfering, so it can only travel forward. There are several "it depends", including if it yanks the wheels or rolls them out of the beams on the initial hit. I think it can "pop" the wheels up, out of the beams faster with stops!
Last edited by Locomotion; 09/11/11 11:03 AM.
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072903
09/11/11 11:06 AM
09/11/11 11:06 AM
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Joined: Jan 2003
Posts: 5,898
Florida
Locomotion
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Florida
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Quote:
The ones on the car are more of an adjustable bump stop. We have upper and lowers we custom made at the shop. Ron adjusted the lowers higher limiting the travel, and when I stage and just barely break the beam the RT is horrible. I have to nearly deep stage to get any kind f RT..
There goes my theory, at least in your particular set-up.
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072904
09/11/11 11:12 AM
09/11/11 11:12 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
The ones on the car are more of an adjustable bump stop. We have upper and lowers we custom made at the shop. Ron adjusted the lowers higher limiting the travel, and when I stage and just barely break the beam the RT is horrible. I have to nearly deep stage to get any kind f RT..
How do you leave now.. foot or trans brake... RPM
would help... rear set up also would help... what is
on the rear.... does it lift the fronts
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Re: Front End Limiters and Reaction Time
[Re: MR_P_BODY]
#1072905
09/11/11 12:08 PM
09/11/11 12:08 PM
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Joined: May 2004
Posts: 12,418
Taxes & Virus's R-US, NY
Dragula
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I Live Here
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Taxes & Virus's R-US, NY
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Quote:
Quote:
The ones on the car are more of an adjustable bump stop. We have upper and lowers we custom made at the shop. Ron adjusted the lowers higher limiting the travel, and when I stage and just barely break the beam the RT is horrible. I have to nearly deep stage to get any kind f RT..
How do you leave now.. foot or trans brake... RPM
would help... rear set up also would help... what is
on the rear.... does it lift the fronts
2800rpm leave on the foot brake. Stockish front suspension. Rear is a 4-link with single adjustable shocks. Typically trying to get it to leave straight and level...
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072907
09/11/11 12:25 PM
09/11/11 12:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
The ones on the car are more of an adjustable bump stop. We have upper and lowers we custom made at the shop. Ron adjusted the lowers higher limiting the travel, and when I stage and just barely break the beam the RT is horrible. I have to nearly deep stage to get any kind f RT..
How do you leave now.. foot or trans brake... RPM
would help... rear set up also would help... what is
on the rear.... does it lift the fronts
2800rpm leave on the foot brake. Stockish front suspension. Rear is a 4-link with single adjustable shocks. Typically trying to get it to leave straight and level...
Do you have a anti roll bar on the rear
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Re: Front End Limiters and Reaction Time
[Re: Dragula]
#1072910
09/11/11 12:48 PM
09/11/11 12:48 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Quote:
No anti roll on the 4link. Just tuning the bars to leave straight...
Well a anti roll WILL plant both rears better...
I would add one... I wont build up a 4 link car
without one
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Re: Front End Limiters and Reaction Time
[Re: MR_P_BODY]
#1072912
09/11/11 01:23 PM
09/11/11 01:23 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
Quote:
The ones on the car are more of an adjustable bump stop. We have upper and lowers we custom made at the shop. Ron adjusted the lowers higher limiting the travel, and when I stage and just barely break the beam the RT is horrible. I have to nearly deep stage to get any kind f RT..
How do you leave now.. foot or trans brake... RPM
would help... rear set up also would help... what is
on the rear.... does it lift the fronts
2800rpm leave on the foot brake. Stockish front suspension. Rear is a 4-link with single adjustable shocks. Typically trying to get it to leave straight and level...
Do you have a anti roll bar on the rear
If you look at the RR tire you can see that the outer
and inner 1" or so is NOT in contact with the track...
most people think that the car is rolling over to
the right rear but in reality the right rear tire is
rolling UP into the wheel well trying to roll around
the drive shaft and the left rear tire is planting
harder than the right... this is where the anti roll
CAN help plant both tires... if you can up the launch
rpm that would help the RT.... if you dont roll
(the body does roll but not like most think)
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Re: Front End Limiters and Reaction Time
[Re: Mopar-Al]
#1072914
09/11/11 07:28 PM
09/11/11 07:28 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
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Romeo MI
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Quote:
My 68 dart has front end limiters on it. But no anti roll bar installed. For what it is , it does ok as far as I can tell. Tube chassis , coil overs, rack n pinion, ladders bars set in the middle hole wheelie bars set at 2.5 inches. Leaves straight and hard. Most of the time I trans break it, when I flash, I leave at 2800. My wheels don't come up but an inch or so, but the limiters are loose to 2 inches or so when front end is relaxed. I only 60' like 1.36 or so usually tho. On a bad prepped track around 1.50
You would only need a anti roll to cover up for flexing
so if it doesnt flex much you dont need one (on a
ladder bar car)
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Re: Front End Limiters and Reaction Time
[Re: Mopar-Al]
#1072916
09/12/11 10:57 AM
09/12/11 10:57 AM
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Joined: May 2004
Posts: 12,418
Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
Posts: 12,418
Taxes & Virus's R-US, NY
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No anti roll for this year, but maybe next year. As for reaction times, I usually adjust front tire air pressure, but I am maxed on that, raise launch rpm, I can, but it hits the tire harder and might not be as consistant...What about adjusting the limiters?
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