Re: Why not use 727 like a glide
[Re: W7_Scamp]
#624119
02/26/10 05:52 PM
02/26/10 05:52 PM
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maximum entropy
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imo, the right converter is key to the whole deal. i've had cars with loose converters and very tall gears, and everytime i put steeper gear in it, i'd end up going back to the freeway gears. the gain was not worth the cost in wear and tear, noise, fuel mileage, et cetera. but i always had the best converters i could afford, and i believe that was why my combos worked.
for what is the good life if not doing things thoughtfully?
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Re: Why not use 727 like a glide
[Re: Dart451]
#624121
02/26/10 07:14 PM
02/26/10 07:14 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
I already have a trans brake why couldn't i use it?
My mistake... I thought you werent using low gear but you are and not using high gear(racing).... sorry
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Re: Why not use 727 like a glide
[Re: Bob_Coomer]
#624123
02/26/10 10:07 PM
02/26/10 10:07 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Im making it complicated LOL... 2.90's a trans brake, and tire with any height at all. how would this be diff that your average everyday race car with a mismatched reared gear set? Sure it will work, sure it will run..why wouldn't it? If its the hos setup we all would be trading in out 4.88's for 3.23 I wasn't trying to be negative, as was just trying to understand what the OP was trying to achieve... still don't know Its all in good fun boys.... (Sling Blade Carl's Voice here) its winter its winter... hmmmm... its still winter. I hate snow
Its a street car and doesnt want a steep gear.... but its still a sacrifice... you wouldnt see a RACE car doing it because he would be giving up alot of torque multiplication of the different rear gears
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Re: Why not use 727 like a glide
[Re: dizuster]
#624125
02/27/10 12:24 AM
02/27/10 12:24 AM
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Anonymous
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Quote:
Uhhhh...can I sprinkle in a little common sense?
Anyone ever run a stock'ish gear (3.23), and then put more gear in the car (4.56)?
Remember how much quicker the 4.56 gear was?...lol...
Sure, it'll peg the butt dyno, and back in the day when everyone had stock converters or a stick car a low gear picked the cars up, but this is 2010 and converters have come a LONG way.......I've done so much gear and converter testing/swapping trying to pick up ET it's crazy, and believe me when I say that with the right converter, gear ratio has very little effect on ET.......
Quote:
Also, loose converter with a gear like that will absolutely sucks for drivability on the street... (ever taken off from 2nd or 3rd on accident, it's terrible)
So why couldn't you do it? Oh you can, it will just be A LOT slower...
Again......that's just not the case............
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My question is this.. What would happen to my 60', 1/4 mile ET and MPH.. and lastly what would the freeway cruising rpm be if I was to convert to a 3.23 or higher gear?
It depends on how much torque the car makes, but I bet you'd be surprised.......Try it and post your results.......
I'm going to make a few different transmission videos and I'll also go into torque converters and stall and flash.........and I will take a car to the track and show how stock, a 3,800, and a 5,000+ stall converters compare, back to back......
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Re: Why not use 727 like a glide
#624126
02/27/10 01:03 AM
02/27/10 01:03 AM
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Joined: Jun 2005
Posts: 6,257 gulfport, ms, west mi
rowin4
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I think the idea was to run the quarter in first and second gear with the torque flite, just need to figure out what tire size , gear ratio and what torque converter would work for max rpm's at the stripe. It would work out for a street driver, Seems easier to go with a proven combo's for a track car.
it's ok to butt heads, just don't do it with a butthead
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Re: Why not use 727 like a glide
[Re: Jeepmon]
#624127
02/27/10 02:46 AM
02/27/10 02:46 AM
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Joined: Jan 2004
Posts: 668 IL
Dart451
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Quote:
I dont know if I'm hijacking this thread by asking as question... but this topic has caught my interest..
My Duster is a true street car that I race alot.. Currently its 3180 lbs plus driver, 727 reverse, 4.10 gears with 28.0" tires..
I cross the line at 6800 rpm and cruise the freeways at about 3500 rpm... The stall is 3500 and the flash is right around 4400 rpm..
The car will 60' in the 1.6x range and the last variable is the gearing in 1st gear, which I dont know..
My question is this.. What would happen to my 60', 1/4 mile ET and MPH.. and lastly what would the freeway cruising rpm be if I was to convert to a 3.23 or higher gear?
at 65 mph with 3.23 you would turn 2520 rpm. The rest of 1/4 mile times would depend on lots of variables and how well your convertor works
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Re: Why not use 727 like a glide
[Re: Dart451]
#624130
02/27/10 10:53 PM
02/27/10 10:53 PM
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Joined: Jan 2003
Posts: 2,734 Charlotte, NC
446acuda
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Quote:
Was running some numbers around and was wondering why not use the first two gears on a 727 like a glide then third will be overdrive.
The 727 1st 2.45 2nd 1.45 so 2.45/1.45=1.69 a glide is 1.76 first to second ratio
I understand the extra drag on internal components and needed to get the convertor set up right.
[image]https://board.moparts.org/ubbthreads/upload2/5829790-Glidevs727.tif[/image]
I don't know a heck of a lot about automatics but I always thought that running a high stall converter below that stall speed for long periods of time makes some major heat but I guess a really big cooler would take care of that. For example, a car with 2.76 rear gear with a 3500 stall converter would be way below 3500 rpm at highway speeds and would put some serious heat into the trans fluid.
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Re: Why not use 727 like a glide
[Re: 446acuda]
#624132
02/28/10 09:39 PM
02/28/10 09:39 PM
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Anonymous
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Anonymous
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Quote:
I don't know a heck of a lot about automatics but I always thought that running a high stall converter below that stall speed for long periods of time makes some major heat but I guess a really big cooler would take care of that. For example, a car with 2.76 rear gear with a 3500 stall converter would be way below 3500 rpm at highway speeds and would put some serious heat into the trans fluid.
Quote:
You can easily cruise under the stall speed. There is not much load on stall at 55 mph.
Exactly.......
The converter only stalls that high at wide open throttle.........so it's not a biggie, unless you've got a cheap converter......
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Re: Why not use 727 like a glide
[Re: Monte_Smith]
#624136
03/02/10 01:35 AM
03/02/10 01:35 AM
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Irun5snd8th
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I would certainly like to hear that discussion. Monte you are well respected so if you think it wont calm the car down on the launch; I want to hear the theory behind that. I know it definitely calmed mine down.
AFCO, Rons Fuel Injection sponsored Dodge Challenger
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