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Race Brake Weight Difference Rear Drum Swap #1593771
03/16/14 12:36 PM
03/16/14 12:36 PM
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Scamp408 Offline OP
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Going from 10x2.5 to race disc anybody have #s?

Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593772
03/16/14 12:51 PM
03/16/14 12:51 PM
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Taxes & Virus's R-US, NY
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I have a set of 11x3 out in the garage I just took off the race car & replaced with Willwoods...If I had a scale I could tell you.


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
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https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
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Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593773
03/16/14 01:03 PM
03/16/14 01:03 PM
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Romeo MI
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Quote:

Going from 10x2.5 to race disc anybody have #s?




Are you a foot braker... drums have a better holding
ability over disc... but the disc have better stopping
ability

Re: Race Brake Weight Difference Rear Drum Swap [Re: MR_P_BODY] #1593774
03/16/14 03:18 PM
03/16/14 03:18 PM
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Yes foot brk . Just wondering worth the 550.00 or not for me as far as weight an ET.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593775
03/16/14 03:26 PM
03/16/14 03:26 PM
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Romeo MI
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Quote:

Yes foot brk . Just wondering worth the 550.00 or not for me as far as weight an ET.




Depending on how high you rev at the line the disc
MIGHT not hold.... on my Rampage I put drums on the
rear just because I will foot brake it(no trans brakes
allowed in the class I want to run)

Re: Race Brake Weight Difference Rear Drum Swap [Re: MR_P_BODY] #1593776
03/16/14 03:37 PM
03/16/14 03:37 PM
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Scamp408 Offline OP
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Didn't even think of that Im at like 1800-2000

Re: Race Brake Weight Difference Rear Drum Swap [Re: MR_P_BODY] #1593777
03/16/14 03:37 PM
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11secdart Offline
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I had 11 inch drums on my 8 3/4, I switched to Wilwood discs , I weighed everything and came up with a 50 lb savings in weight. I have Wilwoods on the front also , I leave at 2,500 and have left as high as 3,000 and it holds fine on the line.

Last edited by 11secdart; 03/16/14 03:42 PM.

68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
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Re: Race Brake Weight Difference Rear Drum Swap [Re: 11secdart] #1593778
03/16/14 05:35 PM
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Scamp408 Offline OP
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Wow That's a huge difference.

Re: Race Brake Weight Difference Rear Drum Swap [Re: 11secdart] #1593779
03/16/14 06:29 PM
03/16/14 06:29 PM
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Crizila Offline
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Quote:

I had 11 inch drums on my 8 3/4, I switched to Wilwood discs , I weighed everything and came up with a 50 lb savings in weight. I have Wilwoods on the front also , I leave at 2,500 and have left as high as 3,000 and it holds fine on the line.


Aint callen ya a lier, but that number aint happening.


Fastest 300
Re: Race Brake Weight Difference Rear Drum Swap *DELETED* [Re: Crizila] #1593780
03/16/14 09:02 PM
03/16/14 09:02 PM
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Post deleted by 11secdart


68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
16 Honda HRV
Re: Race Brake Weight Difference Rear Drum Swap [Re: 11secdart] #1593781
03/16/14 11:21 PM
03/16/14 11:21 PM
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Great Neck,LI,new york
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HEMI-ITIS has no cure.
My condition is fully BLOWN!!
Re: Race Brake Weight Difference Rear Drum Swap [Re: Crizila] #1593782
03/16/14 11:54 PM
03/16/14 11:54 PM
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Hilltown Pa
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Quote:

Quote:

I had 11 inch drums on my 8 3/4, I switched to Wilwood discs , I weighed everything and came up with a 50 lb savings in weight. I have Wilwoods on the front also , I leave at 2,500 and have left as high as 3,000 and it holds fine on the line.


Aint callen ya a lier, but that number aint happening.




What's not happening? Leave rpm or weight savings?


Brett Miller W9 cnc'd heads
STR Chassis fabraction
Re: Race Brake Weight Difference Rear Drum Swap [Re: 1967dartgt] #1593783
03/17/14 12:56 AM
03/17/14 12:56 AM
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Canton, Ohio
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Sport440 Offline
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Quote:

Quote:

Quote:

I had 11 inch drums on my 8 3/4, I switched to Wilwood discs , I weighed everything and came up with a 50 lb savings in weight. I have Wilwoods on the front also , I leave at 2,500 and have left as high as 3,000 and it holds fine on the line.


Aint callen ya a lier, but that number aint happening.




What's not happening? Leave rpm or weight savings?





THat weight savings should be close. My drums alone weight 40# add in the backing plates, pads, slave cyl, and springs, I could easily see 72# like 11sec dart states.

Could Wilwoods rotors/calipers/pads and brackets come in at 22#? Could be, aluminum calipers dont weight that much.

Re: Race Brake Weight Difference Rear Drum Swap [Re: 1967dartgt] #1593784
03/17/14 01:17 AM
03/17/14 01:17 AM
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Crizila Offline
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Quote:

Quote:

Quote:

I had 11 inch drums on my 8 3/4, I switched to Wilwood discs , I weighed everything and came up with a 50 lb savings in weight. I have Wilwoods on the front also , I leave at 2,500 and have left as high as 3,000 and it holds fine on the line.


Aint callen ya a lier, but that number aint happening.




What's not happening? Leave rpm or weight savings?


The weight savings. Just seems like a lot.


Fastest 300
Re: Race Brake Weight Difference Rear Drum Swap [Re: Crizila] #1593785
03/17/14 01:25 AM
03/17/14 01:25 AM
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I think maybe the key is the 11" drums, versus the 10.5" The 11" drums on my car, are the finned truck drums, which dwarf the original ones. Original poster: You might want to pay close attention, to how much the caliper mounting brkt, and hat thickness move the wheel around in the opening.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Leigh] #1593786
03/17/14 06:54 PM
03/17/14 06:54 PM
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They were the big 11 inch ones, no further comment


68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
16 Honda HRV
Re: Race Brake Weight Difference Rear Drum Swap [Re: 11secdart] #1593787
03/17/14 07:03 PM
03/17/14 07:03 PM
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Scamp408 Offline OP
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I have the 10in anybody know the diff in weight.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593788
03/17/14 07:55 PM
03/17/14 07:55 PM
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Sport440 Offline
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Quote:

I have the 10in anybody know the diff in weight.




Im thinking about 12# each if I remember right. So Your not going to see that 50# loss.

So you might see 30#, You will need to decide if thats worth $550 bucs to you. Your car is already a light weight, you wont see much ET gain at a 30# loss.

But lets say you need pads,drums and maybe some slave cyl,s and stuff. Financially that would make alot of sense to swap at this time.

For A ET gain alone, not worth it IMO

But you do have a SB. So "You guys" need all the help you can.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Sport440] #1593789
03/17/14 08:50 PM
03/17/14 08:50 PM
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Leave RPM depends on converter, gear ratio, master cylinder piston diameter, and pedal ratio. I can leave over 3200 with a pretty stout 572 with my Willwoods.
Doug

Re: Race Brake Weight Difference Rear Drum Swap [Re: Sport440] #1593790
03/18/14 07:46 AM
03/18/14 07:46 AM
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Quote:

Quote:

I have the 10in anybody know the diff in weight.




Im thinking about 12# each if I remember right. So Your not going to see that 50# loss.

So you might see 30#, You will need to decide if thats worth $550 bucs to you. Your car is already a light weight, you wont see much ET gain at a 30# loss.

But lets say you need pads,drums and maybe some slave cyl,s and stuff. Financially that would make alot of sense to swap at this time.

For A ET gain alone, not worth it IMO

But you do have a SB. So "You guys" need all the help you can.



Everything is 3 yr new in the so I am starting to thing its not worth it for the money.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593791
03/18/14 01:42 PM
03/18/14 01:42 PM
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Crizila Offline
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Quote:

Quote:

Quote:

I have the 10in anybody know the diff in weight.




Im thinking about 12# each if I remember right. So Your not going to see that 50# loss.

So you might see 30#, You will need to decide if thats worth $550 bucs to you. Your car is already a light weight, you wont see much ET gain at a 30# loss.

But lets say you need pads,drums and maybe some slave cyl,s and stuff. Financially that would make alot of sense to swap at this time.

For A ET gain alone, not worth it IMO

But you do have a SB. So "You guys" need all the help you can.



Everything is 3 yr new in the so I am starting to thing its not worth it for the money.


Put the $ in a glass front bumper, hood, fenders.


Fastest 300
Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593792
03/18/14 06:37 PM
03/18/14 06:37 PM
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Dunnellon, FL
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I went to Strange rear discs from drums (E body rear w/brakes...don't know what size), saved 37# total.


1979 AMC Spirit, NHRA Q/SA
Re: Race Brake Weight Difference Rear Drum Swap [Re: longram60] #1593793
03/18/14 07:17 PM
03/18/14 07:17 PM
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I have the bumpers and 2.5in brks which are probably e body.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593794
03/18/14 09:36 PM
03/18/14 09:36 PM
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Oregon
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Rear brakes is pretty low on the list of places to save weight. If everything in front of the firewall is as light as possible then start towards the back of the car.

Rear drums are rotating weight so that is an extra benefit, but I'd still rather take weight off in front of the CG or above the CG than at the rear axle.

Re: Race Brake Weight Difference Rear Drum Swap [Re: AndyF] #1593795
03/18/14 10:00 PM
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TRUE THIS.

Re: Race Brake Weight Difference Rear Drum Swap [Re: fullmetaljacket] #1593796
03/19/14 07:44 AM
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Ok thanks guys I am keeping what I have and looking for elsewhere.

Re: Race Brake Weight Difference Rear Drum Swap [Re: Scamp408] #1593797
03/19/14 10:32 AM
03/19/14 10:32 AM
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Shelby mi.
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Shelby mi.
Unsprung weight is very important and drums are unsprung wht because it is whgt you are dragging around and cant utilize it as a benefit.


JAKES AUTOMOTIVE
Re: Race Brake Weight Difference Rear Drum Swap [Re: JAKE68] #1593798
03/19/14 07:51 PM
03/19/14 07:51 PM
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robin hood country
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Sorry to hijack this thread but i've been thinking of wilwood rear brakes, or swapping my 62# odyssey battery for a 21# braile. Can i counteract the reduction in weight from the rear by softening the extension ?
I run afco DA shocks with leaf springs.
Mick


69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
Re: Race Brake Weight Difference Rear Drum Swap [Re: deaks] #1593799
03/19/14 08:15 PM
03/19/14 08:15 PM
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Crizila Offline
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Quote:

Sorry to hijack this thread but i've been thinking of wilwood rear brakes, or swapping my 62# odyssey battery for a 21# braile. Can i counteract the reduction in weight from the rear by softening the extension ?
I run afco DA shocks with leaf springs.
Mick


Weight loss is weight loss. Some places are better than others, but like women, it's all good.


Fastest 300
Re: Race Brake Weight Difference Rear Drum Swap [Re: deaks] #1593800
03/19/14 08:15 PM
03/19/14 08:15 PM
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Romeo MI
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Quote:

Sorry to hijack this thread but i've been thinking of wilwood rear brakes, or swapping my 62# odyssey battery for a 21# braile. Can i counteract the reduction in weight from the rear by softening the extension ?
I run afco DA shocks with leaf springs.
Mick




I would try it as is... then if you need to you can
soften them

Re: Race Brake Weight Difference Rear Drum Swap [Re: Crizila] #1593801
03/20/14 07:52 AM
03/20/14 07:52 AM
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Scamp408 Offline OP
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Quote:

Quote:

Sorry to hijack this thread but i've been thinking of wilwood rear brakes, or swapping my 62# odyssey battery for a 21# braile. Can i counteract the reduction in weight from the rear by softening the extension ?
I run afco DA shocks with leaf springs.
Mick


Weight loss is weight loss. Some places are better than others, but like women, it's all good.



I was looking for the weight loss but everything in rear is only like 3 years old. I would also need a new master or the prop valve or both. So now I am up to 700.+ unless I could use my stuff.

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