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Gear change update

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Post  Tore September 4th 2010, 5:00 pm

I have had a terrible time with this 64 Falcon I bought. I couldnt get it to run any faster than the 10.20s 122-125 mph. I did change the stall on the converter over the winter.This was the same drivetrain that was in my Blue 71 Cobra Torino. We swapped out fuel pumps,ignitions, Etc . I was really disgusted and pissed off. I have never struggled so much with a car.
I also posted on here about a low ratio gear set in a C6 and some said it would hurt me but I couldnt understand why it worked good in the Torino and not the Falcon.
Blake thru up a post about a situation and alot of people responded and they said it would hurt the times. So what the heck I had a set of 3.91 gears set. This was my easiest thing to change. Well I went from 10.20s to 9.87 just by swapping the gears. My best last week was 9.87 130.00 miles per hr. I had 4.30s with a 32" tall tire. SO I have pulled the low ratio tranny out and am in the process of putting in a standard gear ratio tranny and racing this Friday. I will let you know how I make out. So I guess you can gear to low.


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Post  richter69 September 4th 2010, 5:02 pm

yep, BB dont like all that starting line ratio.................thats why the glides works so well when coupled with the right gearing and converter.

Congrats on the numbers............
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Post  res0rli9 September 4th 2010, 5:47 pm

what is the engine specs. on this and whats the wt.

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Post  Tore September 4th 2010, 5:50 pm

514ci, 14.5 to 1 comp, roller cam and P51s ported by Charle evans, Car weighs 3550 with me in it.


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Post  richter69 September 4th 2010, 7:25 pm

I'd sell that c6 crap and stick a glide in it........................ Wink
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Post  Tore September 4th 2010, 7:35 pm

Not right now I got 3 C6s sitting here. And I am on the austerity budget right now,

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Post  jasonf September 4th 2010, 10:32 pm

Do you have any pics of your car Tore?
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Post  IDT-572 September 4th 2010, 11:32 pm

Tore wrote:I have had a terrible time with this 64 Falcon I bought. I couldnt get it to run any faster than the 10.20s 122-125 mph. I did change the stall on the converter over the winter.This was the same drivetrain that was in my Blue 71 Cobra Torino. We swapped out fuel pumps,ignitions, Etc . I was really disgusted and pissed off. I have never struggled so much with a car.
I also posted on here about a low ratio gear set in a C6 and some said it would hurt me but I couldnt understand why it worked good in the Torino and not the Falcon.
Blake thru up a post about a situation and alot of people responded and they said it would hurt the times. So what the heck I had a set of 3.91 gears set. This was my easiest thing to change. Well I went from 10.20s to 9.87 just by swapping the gears. My best last week was 9.87 130.00 miles per hr. I had 4.30s with a 32" tall tire. SO I have pulled the low ratio tranny out and am in the process of putting in a standard gear ratio tranny and racing this Friday. I will let you know how I make out. So I guess you can gear to low.




Tore


Thank you very much.................. Wink
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Post  Nevs September 4th 2010, 11:46 pm

Tore wrote:Not right now I got 3 C6s sitting here. And I am on the austerity budget right now,

Tore

Sell the three, get one 'glide..... Idea
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Post  Mark Miller September 5th 2010, 1:20 am

Tore,

A 9.87 is good but it seems like the MPH should be better than 130 for that ET?

Later Mark.

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Post  richter69 September 5th 2010, 9:12 am

Mark Miller wrote:Tore,

A 9.87 is good but it seems like the MPH should be better than 130 for that ET?

Later Mark.

With the gear swap its happy on the bottom but not so on the top........its laboring in high gear now.
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Post  TravisRice September 5th 2010, 9:22 am

I'd say if you converted to a glide you would probably pick up 2 more numbers and the car might even hook in the rain. Very Happy The glide calmed my leave down and the car just worked much better. It let the suspension work instead of screaming past the usable torque numbers you have. JMO

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Post  IDT-572 September 5th 2010, 9:41 am

richter69 wrote:
Mark Miller wrote:Tore,

A 9.87 is good but it seems like the MPH should be better than 130 for that ET?

Later Mark.

With the gear swap its happy on the bottom but not so on the top........its laboring in high gear now.

I told him to change the gear to prove that it would pick the car up by reducing his first gear FD ratio. Now he needs to put the standard first gear ratio planetary back in and go back to his 4.30 ring gear. Wit the low planet there is a wider gap between 2nd and high that hurts the car from getting in high gear in the sweet spot. Could be whats up with the mph.
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Post  richter69 September 5th 2010, 9:49 am

Yes I knew the gear swap was a easy experiment...............that proved to be correct........... Very Happy
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Post  Tore September 5th 2010, 10:07 am

I am leaving the 3.91s in right now and will see what happens. I have some 4.11s and 4:30s to try but one thing at a time.

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Post  IDT-572 September 5th 2010, 10:15 am

TravisRice wrote:I'd say if you converted to a glide you would probably pick up 2 more numbers and the car might even hook in the rain. Very Happy The glide calmed my leave down and the car just worked much better. It let the suspension work instead of screaming past the usable torque numbers you have. JMO

Travis

I agree with you Travis totally............ But what he is doing is cheap now because he has the three speeds. But it is proving a point. Giving direction on where to go. The car will pick up with a glide.

I think it is still geared to low in first for an efficient leave. That's a 10.63 final where he is now. 10.63 / 1.76 (glide ratio) = 6.04 ring gear with a glide to get a 10.63 final.

Example is Chuck Hagger's 69 Mustang 29.5 tire 4.56 gear with a glide. 3500 lb. Same weight car less engine (492) TFS streets, running less gear. I think he ran a 10 flat and in the low 1.4 60ft's. 8.03 first gear F.D.

With that gear he had to lift early through the quarter because it was getting over 7000 rpm before the stripe. He needs a 4.30 for the 1/4 mile


Last edited by IDT-572 on September 5th 2010, 11:09 am; edited 1 time in total
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Post  IDT-572 September 5th 2010, 10:17 am

Tore wrote:I am leaving the 3.91s in right now and will see what happens. I have some 4.11s and 4:30s to try but one thing at a time.

Tore

Are you going to put the stock first gear C/6 back in it with the 3.91 and see what happens?
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Post  Tore September 5th 2010, 11:50 am

Yes its going back in today. I have to see what its going to do.As I stated I have the other gears all set up.


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Post  Tore September 5th 2010, 11:51 am

With the 3.91s I was shifting at 7k and going thru the traps at 6500 rpm.

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Post  richter69 September 5th 2010, 11:55 am

rough numbers with what you posted thats like 19% on the converter slip....


Last edited by richter69 on September 5th 2010, 12:42 pm; edited 1 time in total
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Post  64 fairlane September 5th 2010, 12:40 pm

Hey guys reading this post has made me think about my own combination. Would a gear swap hurt or improve my over all ET. I have 3400# 64 fairlane 30 inch tall tire 4.56 gear C6 4500rpm converter 60 foot is 1.38 and 1/4 mile at 135 9.99 sec at 7100 rpm. If I changed the rear gear to a 4.30 or 4.11 do you think my 60 foot would improve. Aaron
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Post  richter69 September 5th 2010, 12:43 pm

You just have to try stuff, gears, tire sizes, converter set ups etc. Not every swap thats good for one combo is good for another.
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Post  Greg_P September 6th 2010, 12:10 pm

Mark Miller wrote:Tore,

A 9.87 is good but it seems like the MPH should be better than 130 for that ET?

Later Mark.

I agree, our best of 9.95 came with darn near 136 mph..... 3.89 gear and 29.5" tire.

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Post  512Fairlane September 6th 2010, 12:45 pm

Tore wrote:Yes its going back in today. I have to see what its going to do.As I stated I have the other gears all set up.


Tore

Can't wait to hear how this works out. Keep us posted. When will you get to run it next?
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Post  TravisRice September 6th 2010, 6:30 pm

Guy's ,
I fully understand what you are trying to accomplish on a budget with what you have. Given the info that you are providing and seeing which direction the car is going (faster) my suggestion would be to start saving $$$ for a glide. The car is definatley heading in the right direction. Be interested to see what the rest of the year holds as far as et and mph gains with what you have. Keep after it.

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