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
November 02, 2022, 01:04 PM
vetman
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
The difference between ignorance and stupidity. Ignorance is lack of knowledge. Stupidity is the inability to learn. Don't be stupid
November 02, 2022, 01:16 PM
CURTIS REED
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.
____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
November 02, 2022, 01:35 PM
Mike Rietow
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,
November 02, 2022, 02:08 PM
Mike Rietow
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
November 02, 2022, 03:08 PM
markemark
Like Curtis wrote…… 1+2 transbrake VB would be my choice. Still have good mph with slower 60’ +ET.
November 02, 2022, 03:23 PM
SP 124X
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
November 02, 2022, 03:31 PM
CURTIS REED
How much are you wanting to slow it down?
____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
November 02, 2022, 04:16 PM
Top355x
Disconnect secondaries
November 02, 2022, 06:17 PM
B KING
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.
1980 Camaro Taking the Best Working Small Tire Shyt Box & making it Greater Than Before! 3000 lbs. Pump Gas 436
November 03, 2022, 06:14 AM
Dave Koehler
Throw the chute at 100 ft.
Dave Koehler - Koehler Injection - http://www.koehlerinjection.com Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing 99% of fuel injection problems are electric.
November 03, 2022, 09:12 AM
pauley
i can shift from 7k to shift on time at .25 and slow down .4 in the 1/8.
ep
November 03, 2022, 09:28 AM
Mike Rietow
Too many clutches will slow you down (drag),5,6,7 hundredths.
Intentionally, I have way too many clutches currently.
November 03, 2022, 09:46 AM
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..
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.
November 03, 2022, 10:05 AM
Mike Rietow
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.
November 03, 2022, 10:28 AM
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
November 03, 2022, 10:30 AM
CURTIS REED
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.
____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
November 03, 2022, 12:58 PM
1320racer
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.
