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Lowering a Car for ET? #2838857
10/29/20 02:58 PM
10/29/20 02:58 PM
Joined: May 2004
Posts: 11,197
Taxes & Virus's R-US, NY
Dragula Offline OP
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Dragula  Offline OP
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Is it worth lowering, and what kind of change in ET do you get.....I just eliminated my exhaust from underneath the car...Probably could lower it 3.5" now.

2999.jpeg2997.jpeg

'71 Duster 400/512
https://www.youtube.com/watch?v=Znuo3jMUXTk (6.00 at 114.05mph)
https://www.youtube.com/watch?v=Y9hxSMAWoII (9.66 at 139mph)

'70 Cuda, Plan C....605 Hemi Street Car
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph)(823hp and still tuning)
https://www.youtube.com/watch?v=3zQEb9uxFng
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)
Re: Lowering a Car for ET? [Re: Dragula] #2838897
10/29/20 04:35 PM
10/29/20 04:35 PM
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Fulton County, PA
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CMcAllister Offline
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Lower CG on a fast car is a good thing.


If the results don't match the theory, change the theory.
Re: Lowering a Car for ET? [Re: Dragula] #2838907
10/29/20 04:50 PM
10/29/20 04:50 PM
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New York
polyspheric Offline
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To me, the critical question is "does it affect weight transfer and launch?".
If none or minimal, go for it!


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Re: Lowering a Car for ET? [Re: Dragula] #2838927
10/29/20 05:19 PM
10/29/20 05:19 PM
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It helps with aero. May or may not help with ET. Looks faster.

Re: Lowering a Car for ET? [Re: polyspheric] #2838971
10/29/20 07:12 PM
10/29/20 07:12 PM
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Frostbitefalls MN (Rocky&Bullw...
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Originally Posted by polyspheric
To me, the critical question is "does it affect weight transfer and launch?".
If none or minimal, go for it!

Thats how i understand it. You have to have the power to keep enough weight transfer for traction. So it becomes a balance of cg position and torque that can sustain weight transfer. Look at a modern prostocker launch versus a high ten second bracket door slammer launch. Then consider where thier CGs are and torque available for the first 10 to 20 feet.


8.77 153 mph best, 3055 lbs 528 indy 440-1 alky
Re: Lowering a Car for ET? [Re: AndyF] #2839062
10/29/20 09:49 PM
10/29/20 09:49 PM
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Originally Posted by AndyF
It helps with aero. May or may not help with ET. Looks faster.


Be interesting what effect just that exhaust location might have on aero, vs say slightly turned up, thru the hood, etc


Discovering "good trouble" everyday
Re: Lowering a Car for ET? [Re: polyspheric] #2839119
10/30/20 02:22 AM
10/30/20 02:22 AM
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at work
Grizzly Offline
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Make the car move forward, not up.

Upward motion is wasted energy. At least, that's my experience in motorsports. twocents

30.jpg
Re: Lowering a Car for ET? [Re: Dragula] #2839233
10/30/20 10:42 AM
10/30/20 10:42 AM
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Zumbrota,MN
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als499 Offline
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My 72 Duster went quicker each time I lowered the front, picked up a solid tenth and atleast 1 mph.

Re: Lowering a Car for ET? [Re: als499] #2839291
10/30/20 12:29 PM
10/30/20 12:29 PM
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MI, usa
dvw Offline
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High CG and upward motion is not needed IF the car hooks. Raising CG acts like moving weight to the rear. My bet on a normal bracket car the gain will be small if any.
Doug

Re: Lowering a Car for ET? [Re: dvw] #2839304
10/30/20 12:53 PM
10/30/20 12:53 PM
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Hot Rod Ridge
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Yes it helps. It doesn't look like your using very many aero tricks.
On your car. There are many. You reduce drag when you lower

Re: Lowering a Car for ET? [Re: Dragula] #2839360
10/30/20 03:13 PM
10/30/20 03:13 PM
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Bend,OR USA
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Cab_Burge Offline
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If your running slower than 150.MPH in the 1/4 mile it probably won't help a bunch, if faster than 150. MPH it will have more affect up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Lowering a Car for ET? [Re: Dragula] #2839381
10/30/20 04:17 PM
10/30/20 04:17 PM
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State of confusion
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My junk liked the chin spoiler in the front and I drilled holes in the rear valance for air to escape both helped in et and mph a bit......


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: Lowering a Car for ET? [Re: Thumperdart] #2839415
10/30/20 06:23 PM
10/30/20 06:23 PM
Joined: May 2004
Posts: 11,197
Taxes & Virus's R-US, NY
Dragula Offline OP
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Interesting responses.....Lack of empirical data makes this mostly opinion then....So here is my understanding:

I used to race RC cars, specifically Dirt Oval as a sponsored driver, and they are not moving at 150mph, but aero plays a huge affect on handling and stability. A good handling car makes faster laps and generally finishes higher in the standings...Even at relatively low speeds like 30mph....

So when I look at my Duster, it sits higher than my Cuda and couldn't be lowered due to the headers. Now that those are out of the way, I can now lower a bunch.....What the results are, I have no idea.

My plan is to lower it, and put a chin piece on it....and then get it re-scaled and the IC changed if needed..


'71 Duster 400/512
https://www.youtube.com/watch?v=Znuo3jMUXTk (6.00 at 114.05mph)
https://www.youtube.com/watch?v=Y9hxSMAWoII (9.66 at 139mph)

'70 Cuda, Plan C....605 Hemi Street Car
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph)(823hp and still tuning)
https://www.youtube.com/watch?v=3zQEb9uxFng
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)
Re: Lowering a Car for ET? [Re: Grizzly] #2839455
10/30/20 07:54 PM
10/30/20 07:54 PM
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jcc Offline
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Originally Posted by Grizzly
Make the car move forward, not up.

Upward motion is wasted energy. At least, that's my experience in motorsports. twocents


Well my thinking, and NOTHING matters except what a Wind tunnel indicates and a time skip proves, is the directed exhaust out the side in the OP's location could have significant "air curtain" effects on the side skirt area of the car that "could" be very beneficial, at speed, where traction is less of an issue.


Discovering "good trouble" everyday
Re: Lowering a Car for ET? [Re: jcc] #2839472
10/30/20 08:25 PM
10/30/20 08:25 PM
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Tulsa OK
Bad340fish Offline
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I know most of your racing is 1/8th mile where aero mods will have the least effect. Ideally I think you need to test it with the new headers before you do anything else. Just to see if they help or hurt performance.


68 Barracuda Formula S 340
Re: Lowering a Car for ET? [Re: jcc] #2839475
10/30/20 08:28 PM
10/30/20 08:28 PM
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Posts: 6,855
Tulsa OK
Bad340fish Offline
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Originally Posted by jcc
Originally Posted by Grizzly
Make the car move forward, not up.

Upward motion is wasted energy. At least, that's my experience in motorsports. twocents


Well my thinking, and NOTHING matters except what a Wind tunnel indicates and a time skip proves, is the directed exhaust out the side in the OP's location could have significant "air curtain" effects on the side skirt area of the car that "could" be very beneficial, at speed, where traction is less of an issue.


I get what you are saying but a Duster is already blasting a pretty big hole in the air as it is, not tons of air on the side of these cars I am willing to bet.


68 Barracuda Formula S 340
Re: Lowering a Car for ET? [Re: Bad340fish] #2839500
10/30/20 09:41 PM
10/30/20 09:41 PM
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jcc Offline
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Originally Posted by Bad340fish
I know most of your racing is 1/8th mile where aero mods will have the least effect. Ideally I think you need to test it with the new headers before you do anything else. Just to see if they help or hurt performance.







Yes, 1/8 mile would likely show minimal bang for buck with aero, but how much does one need to be ahead of the other guy to win? work


Discovering "good trouble" everyday
Re: Lowering a Car for ET? [Re: Dragula] #2839631
10/31/20 08:29 AM
10/31/20 08:29 AM
Joined: Oct 2007
Posts: 3,621
New York
polyspheric Offline
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Lowering the nose may increase your rear down-force


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Re: Lowering a Car for ET? [Re: Dragula] #2839725
10/31/20 11:29 AM
10/31/20 11:29 AM
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Thumperdart Offline
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Where are you going to install the o2 sensor and your idle and low speed readings are going to be heavily skewed......


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: Lowering a Car for ET? [Re: Thumperdart] #2839859
10/31/20 06:17 PM
10/31/20 06:17 PM
Joined: May 2004
Posts: 11,197
Taxes & Virus's R-US, NY
Dragula Offline OP
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I asked him to install one on the passenger side. Typically with short headers and no mufflers you really don't get an idle reading..I pick the car up tomorrow....So this will be interesting.

Last edited by Dragula; 10/31/20 06:19 PM.

'71 Duster 400/512
https://www.youtube.com/watch?v=Znuo3jMUXTk (6.00 at 114.05mph)
https://www.youtube.com/watch?v=Y9hxSMAWoII (9.66 at 139mph)

'70 Cuda, Plan C....605 Hemi Street Car
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph)(823hp and still tuning)
https://www.youtube.com/watch?v=3zQEb9uxFng
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)
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