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Slowing down a fast car
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DRR Trophy
Picture of NC3x58
posted
If you were trying to slow down a car, what would be the best option?

1. adjust throttle pedal stop (or lengthen throttle rod) to close carburetor throttle blades to 50-70% roughly
2. under carb throttle stop, various options on opening/closing, but to keep it simple just fixing it at the same blade opening as you would with carb blades
3. adjustable restrictor plate style?
4. another method?

This is in a 5.40ish door car, 565BBC application. Standard powerglide etc.


Nick Craig

1971 Camaro Split Bumper
376ci LS3
 
Posts: 410 | Location: Ohio | Registered: December 28, 2013Reply With QuoteReport This Post
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Early shifting is my choice . I have shifted as early as 6400 on my 6200 stall and it slowed right at .300 and was very consistent


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Posts: 302 | Location: des moines iowa | Registered: January 10, 2020Reply With QuoteReport This Post
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Picture of CURTIS REED
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I slowed my roadster from 5.80 to 6.50. It took 60lbs on the back, pulling 6° timing, shifting at .200 and running a 1.1875" restrictor plate.

It's harder than I thought it would be to slow one down. I can kill .400 just by running high gear only but I'm a footfeeder.



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Posts: 2360 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of Mike Rietow
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You keep your mph to a large degree shifting early. I shift a hundredth after TB release.

It takes 2.5 hundredths for the shift to complete after that, 4 hundredths or so, at stall.

There's a dip after stall anyway, so visually the car looks no different, other than slow early in the run.

I run a converter that's 500-600 too loose also, for the fuel curve, to not to lug the engine after the shift 6700 stall.

This message has been edited. Last edited by: Mike Rietow,


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Posts: 8818 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR S/Pro
Picture of Mike Rietow
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I've been 112 on bias tires high gear only, radials don't grow so I can't run the gear I want to get the converter slipping 4-6% crossing at a reasonable rpm, so I'm going 110-111mph on radials crossing 6900 rpm,converter slipping around 10-12%.

It's the best path I think although I haven't perfected it yet to a degree to be Ultra competitive Super Pro racing, it's getting closer though every race with adjustments in between.

I think I'm just down to mixture now - jets & timing



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Like Curtis wrote…… 1+2 transbrake VB would be my choice. Still have good mph with slower 60’ +ET.
 
Posts: 1987 | Location: 53056 | Registered: December 30, 2009Reply With QuoteReport This Post
DRR Sportsman
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If this is a long term thing I'd suggest leaving in high gear. It kills .5 to .6 in ET (1/4) and about .060 in the box depending on the converter and gearing.


Denis LeBlanc

 
Posts: 346 | Location: Manchester, NH | Registered: February 03, 2006Reply With QuoteReport This Post



DRR Pro
Picture of CURTIS REED
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How much are you wanting to slow it down?



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Disconnect secondaries
 
Posts: 339 | Location: Natick MA | Registered: November 15, 2017Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by NC3x58:
If you were trying to slow down a car, what would be the best option?

1. adjust throttle pedal stop (or lengthen throttle rod) to close carburetor throttle blades to 50-70% roughly
2. under carb throttle stop, various options on opening/closing, but to keep it simple just fixing it at the same blade opening as you would with carb blades
3. adjustable restrictor plate style?
4. another method?

This is in a 5.40ish door car, 565BBC application. Standard powerglide etc.


IMO, out of the suggestions provided; I would use the one that best slows down the ET to what you want, while still retaining the most MPH. Out of your list, I would use #2.


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Throw the chute at 100 ft.


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Posts: 335 | Location: Urbana, IL 61802 | Registered: December 03, 2003Reply With QuoteReport This Post
DRR Sportsman
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i can shift from 7k to shift on time at .25 and slow down .4 in the 1/8.

ep
 
Posts: 660 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of Mike Rietow
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Too many clutches will slow you down (drag),5,6,7 hundredths.

Intentionally, I have way too many clutches currently.


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Posts: 8818 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
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For the purpose of this car, the owner is trying to get it to hit the tire a little easier and make the car just less violent all the way down really..


Nick Craig

1971 Camaro Split Bumper
376ci LS3
 
Posts: 410 | Location: Ohio | Registered: December 28, 2013Reply With QuoteReport This Post



DRR Sportsman
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Can you run high gear only ?
 
Posts: 593 | Location: Latrobe Pa. | Registered: July 30, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of Mike Rietow
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quote:
Originally posted by NC3x58:
For the purpose of this car, the owner is trying to get it to hit the tire a little easier and make the car just less violent all the way down really..


I've fought that from day one on a pizza cutter small tire.

Best thing I ever did for that purpose was put a TSI spragless in it, no slower, but smoother.

I think it's smoother because it flashes 200 rpm higher than drop back at the shift stall, in order to make up for less torque multiplication below stall than most sprag converters, also the phenomenon for why it's no slower,,, I think.

Feels slower though, smoother.

Traction control.


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Posts: 8818 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR S/Pro
Picture of Mike Rietow
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A camshaft with a bunch of duration relative the engine combo will do a fair job in that regard as well, if you prefer a sprag converter.


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Posts: 8818 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR S/Pro
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quote:
Originally posted by NC3x58:
For the purpose of this car, the owner is trying to get it to hit the tire a little easier and make the car just less violent all the way down really..

Gear change will do that
 
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DRR Pro
Picture of CURTIS REED
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quote:
Originally posted by green1:
quote:
Originally posted by NC3x58:
For the purpose of this car, the owner is trying to get it to hit the tire a little easier and make the car just less violent all the way down really..

Gear change will do that


Put a 1.64 gear set in it. Still have the RPM you need at the other end. Not sure about the violent all the way down part.



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DRR Elite
Picture of 1320racer
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quote:
Originally posted by NC3x58:
For the purpose of this car, the owner is trying to get it to hit the tire a little easier and make the car just less violent all the way down really..

sounds like a band aid approach to fix a car that don't work.


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