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Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 I made a graph to compare the 700-R4 to an M-21 Reply to this post

I thought i'd take a really wide ratio transmission (700-R4) and compare it with a very close ratio transmission (M-21). I was quite amazed at what I got. If it matters, I used a 28.5" slick with 4.88 gears and a 7000rpm redline. Oh, and a 120mph trap speed.

[Modified by Stingy74, 8:55 PM 3/20/2002]

[Modified by Stingy74, 9:06 PM 3/20/2002]
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Budman78
Senior Member




1536 posts [100%]
This space for rent

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Cool graph. I didn't realize that the shift points where that steep on the 700. From 7000 to 4000, you better have a good flat torque curve for it. Thanks Stingy, I will save that for later use.
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http://www.corvetteforum.net/c3/budman78/

Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (Budman78) Reply to this post

Budman, if you listen to the engine in my second video you'll notice that my non low end torque engine really suffers from the super wide ratio's. The 4.11's help offset the difference, but it could still be better.
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bence13_33
Senior Member


1938 posts [100%]
Clymer PA

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Excellent graph Aaron! Whenever I watched your video, I could tell that your RPMs dropped pretty significantly. What exactly are the ratios of the 700R4? I'm hoping that my wide ratio Super T10 won't drop too badly (RPM wise)...I think the torque of the big block will also help out though.
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Coming On 3-31-02: 468 Big Block
'76 Flame Orange Coupe/Black Leather Interior
My Home Page: http://temp.corvetteforum.net/c3/bence454

Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (bence13_33) Reply to this post

quote:
Excellent graph Aaron! Whenever I watched your video, I could tell that your RPMs dropped pretty significantly. What exactly are the ratios of the 700R4? I'm hoping that my wide ratio Super T10 won't drop too badly (RPM wise)...I think the torque of the big block will also help out though.

In the video you can tell that the second to third gear shift is pretty bad because the converter locks in the top of second as well. The 700-R4 ratio's are: 3.06, 1.63, 1.00, .70. You are right when you say that torque will help in the situation of a wide ratio transmission, Give me a minute and i'll do a comparo for your transmission as well.
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Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Ok, she's fixed now!

[Modified by Stingy74, 9:07 PM 3/20/2002]
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Budman78
Senior Member




1536 posts [100%]
This space for rent

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

That video doen't do your car justice though. It seems like you are just casually cruising along and I bet you are hitting over 100 at the end.
Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (Budman78) Reply to this post

quote:
That video doen't do your car justice though. It seems like you are just casually cruising along and I bet you are hitting over 100 at the end.

I reach the top of 3rd and dip into 4th a bit there. By the numbers that's a hair over 120.
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Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (Bence13_33) Reply to this post

Bence, here's the rundown on your cars transmission. As you can see, the gear spacing is better than my automatic.



[Modified by Stingy74, 9:49 PM 3/20/2002]
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bence13_33
Senior Member


1938 posts [100%]
Clymer PA

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Aaron:
That's not as bad as I thought it would be. What gear ratios did you come up with?

Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (bence13_33) Reply to this post

For fun, here's a Powerglide (racers choice). I IM'd you the Borg Warner ratio's I used. If you didn't get them, they are 2.88, 191, 1.33, 1.00

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Jester69Stingray
Senior Member




328 posts [100%]
Pflugerville/ Colllege Station TX

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Those graphs are cool
If its not too much trouble could you do one for a M20
2.52 1.88 1.46 1.00
Im curious to see the diffrence between that and the M21

Thanks

[Modified by Jester69Stingray, 10:14 PM 3/20/2002]
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Justin
http://forums.corvetteforum.com/My%20Webpage
'69 Convertible
L46 350
M20 4spd
Daily Driven

gerry c
Senior Member


130 posts [100%]
Lake Hughes CA

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

The numbers compared to the Super T-10 look about perfect. Are those S T10 numbers that I would have in my '81?

The 1-2 shift in a 700R4 is a killer. I have one in my '89 Jimmy and could not believe people would put one in for a performance upgrade.
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1981 ext silver/blue int blue
four speed
56K original miles
all stock except aftermarket 15x8 wheels and koni shocks


Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (Jester69Stingray) Reply to this post

quote:
Those graphs are cool
If its not too much trouble could you do one for a M20
2.52 1.88 1.46 1.00
Im curious to see the diffrence between that and the M21

Thanks


Here the m21/m22 comparo:


[Modified by Stingy74, 10:45 PM 3/20/2002]
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67HEAVEN
Senior Member




2100 posts [100%]
Southern Ontario...closer to Heaven.

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Good stuff.

How about:

Richmond 6-speed
3.27 - 2.13 - 1.57 - 1.23 - 1 - 0.76
-----------------------------------------------------------
Richmond 6-speed
3.01 - 1.88 - 1.46 - 1.19 - 1 - 0.62
-----------------------------------------------------------

Stingy74
Senior Member




1913 posts [100%]
Eh, Aboot, Hoser, etc... Regina, Sask. Canada

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 Re: I made a graph to compare the 700-R4 to an M-21 (67HEAVEN) Reply to this post

Here's your graph For some reason I became very frustrated making the last few graphs, so I hope they are right!

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MARKUS_P
Senior Member




602 posts [100%]
near VIENNA, AUSTRIA

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 Re: I made a graph to compare the 700-R4 to an M-21 (Stingy74) Reply to this post

Stingy, one last graph for me?
Could you add the common TH350 from my 76 to your first graph where the 700R4 is shown?
That would give me a good comparison
Thanks, Markus
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355cui, 375 HP, 750 edelbrook, 550 lbs VB coils, fiberglas rear spring, VB o-ring calipers, steel braided hoses, hole shot 2000 torque converter, 3,08 gear ratio, TH 350 modified for shorter and crisper shifts, ACCEL high output coil, recurve kit,holley fuel pump, dynomax coated headers and ultra flow mufflers, etc. etc., Currently restoring the body

69Roadster
Senior Member


560 posts [100%]
Madison AL

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 Re: I made a graph to compare the 700-R4 to an M-21 Reply to this post

Great stuff! Thanks for posting it.



[Modified by 69Roadster, 3:17 PM 3/21/2002]
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1969 Roadster Big Block 4-speeds
One black, one being painted red, one bare fiberglass

69Roadster's Place



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