Battery location ? - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 32 Old 12-21-2018, 12:31 AM Thread Starter
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Battery location ?

So for ####s and giggles where did you relocate your battery? I see a lot of racers install it over the passengers side rear tire. Why? I see a lot of cars side step to the right and try to pull the left front tire. So correct me if I'm wrong, didn't most all the foxes of the 90s run an air bag in the RR spring.


So where did you locate your battery and why. Some pics would be nice of a fox with battery located over the LR.

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post #2 of 32 Old 12-21-2018, 09:09 AM
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It's all in the game of traction. The right rear tire gets hit harder than the left when the car leaves so putting the extra weight over it would make sense. It's also the way drivetrain rotation works against the car. You'll never see a car pull the passenger side front tire only. It's either the driver side front or both.

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post #3 of 32 Old 12-21-2018, 09:47 AM
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i havent mounted my battery box yet. its going to depend where the scales say i need weight once the motor is in the car? ive seen them anywhere from the front bumper to the rear bumper

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post #4 of 32 Old 12-21-2018, 10:31 AM
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I'm sure the scale idea is the best but mine is 99% street car so I wanted it out of my way. I have a secondary fuel cell in the battery spot. So this battery is light and let me keep it clean in the back.
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post #5 of 32 Old 12-21-2018, 11:21 AM
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Batteries have been installed over the right rear for ions because of direction the engine turns. The torque tries to twist the axle the opposite way, lifting the right side and planting the left.

Some more race oriented suspensions have compensation for that effect built in.

'87, 105,000 mile stk short, SN89 Paxton 5 LBS, X303 Hds, E303, Cobra Int, 70 mm TB, 30# injrs, 1 5/8 full leng, no cats, 2 1/2 w/dumps, A5, 3.73, ET R's, Frnt Drag Eibach sprngs, Baseline Relocated upprs, HPM lwr arms, stk rear sprngs 1 coil cut, adj. struts shocks, 3150 w/dr. 1.60 11.39 118.
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post #6 of 32 Old 12-21-2018, 06:02 PM Thread Starter
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A scale will not tell you how the car will transfer weight. By the above theory you will put more weight to the RR tire. Watch a stock fox leave. It side steps to the RR. Why would you take traction away from the LR. The air bag in the RR spring helped even out the load. So does the anti roll bar. So why would you install the battery over the RR tire?
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post #7 of 32 Old 12-21-2018, 09:12 PM
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This only applies to a car with a solid rear axle and a driveshaft which rotates CCW when viewed from the rear.

The driveshaft torque reacts through the trans, crankshaft, rods, pistons, gas pressure in the combustion chamber, cylinder head, engine block and engine mounts to force the chassis of the car to rotate CW. At the same time, the driveshaft torque is pushing the LR tire down on the ground harder and lifting up the RR tire. This results in less weight over the RR tire than the LR tire. With any given pair of tires on a car, they generate the most possible traction when they share the vertical load on them equally. Given that you can place the battery anywhere, you want to put it in the RR corner of the car, so that the dynamic vertical loads at launch on each rear tire are equal. This gives the greatest possible forward traction for a given total car weight.
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post #8 of 32 Old 12-21-2018, 09:44 PM
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Quote:
Originally Posted by wywindsor View Post
So for ####s and giggles where did you relocate your battery? I see a lot of racers install it over the passengers side rear tire. Why? I see a lot of cars side step to the right and try to pull the left front tire. So correct me if I'm wrong, didn't most all the foxes of the 90s run an air bag in the RR spring.
The body only lifts at the left front on launch because the rear axle twists opposite engine direction, causing the torque to lift the right side of the axle. This allows the left front to rise.

When a car with an open differential is stuck in the snow, the right rear tire spins. That's because the torque is lifting the right rear tire.

'87, 105,000 mile stk short, SN89 Paxton 5 LBS, X303 Hds, E303, Cobra Int, 70 mm TB, 30# injrs, 1 5/8 full leng, no cats, 2 1/2 w/dumps, A5, 3.73, ET R's, Frnt Drag Eibach sprngs, Baseline Relocated upprs, HPM lwr arms, stk rear sprngs 1 coil cut, adj. struts shocks, 3150 w/dr. 1.60 11.39 118.
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post #9 of 32 Old 12-22-2018, 06:45 AM
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Quote:
Originally Posted by SpeedThrills View Post
The body only lifts at the left front on launch...
Because the chassis is not set up properly, IE Cage and ARB are not installed.

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post #10 of 32 Old 12-22-2018, 04:47 PM Thread Starter
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So your telling me this car has more weight on the LR?

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post #11 of 32 Old 12-22-2018, 04:49 PM Thread Starter
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post #12 of 32 Old 12-22-2018, 09:30 PM
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Quote:
So your telling me this car has more weight on the LR?
No, not at all about where weight is. (Not initially, the weight, in this case the battery, is placed over the right rear to counter what is happening.) The engine's torque is rotating the axle opposite the engine's rotation. From that rear view, the axle is rotating counter-clockwise, (as Jack said) allowing the left rear of the car (and the left front) to rise, while the right rear squats.

Maybe this: the body does the opposite of what the axle is doing. "For every action, there is an equal and opposite reaction."

It's been so many years since I learned this that I'm having a hard time explaining it. I'm going to search for a "more better" explanation. (EDIT: no luck)

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post #13 of 32 Old 12-23-2018, 02:36 PM Thread Starter
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post #14 of 32 Old 12-23-2018, 02:38 PM Thread Starter
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WTF. Why can't I post a link?
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post #15 of 32 Old 12-23-2018, 11:55 PM
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Quote:
Originally Posted by Saleen414 View Post
Because the chassis is not set up properly, IE Cage and ARB are not installed.
I understand, but I believe we're talking a relatively stock chassis, maybe one that can be driven on the street.

'87, 105,000 mile stk short, SN89 Paxton 5 LBS, X303 Hds, E303, Cobra Int, 70 mm TB, 30# injrs, 1 5/8 full leng, no cats, 2 1/2 w/dumps, A5, 3.73, ET R's, Frnt Drag Eibach sprngs, Baseline Relocated upprs, HPM lwr arms, stk rear sprngs 1 coil cut, adj. struts shocks, 3150 w/dr. 1.60 11.39 118.
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post #16 of 32 Old 12-24-2018, 06:03 AM
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I highly doubt putting the battery over the passenger axle makes any difference in the world, however it sounds like a good theory, so that’s where I put mine. I also relocated it there for emergency shutoff reasons and I like it hidden and not in the engine bay.

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post #17 of 32 Old 12-24-2018, 08:57 AM
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Quote:
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I highly doubt putting the battery over the passenger axle makes any difference in the world, however it sounds like a good theory, so thatís where I put mine. I also relocated it there for emergency shutoff reasons and I like it hidden and not in the engine bay.
+1, that's what I did. What matters the most is that the weight of the battery is transferred to the rear end of the vehicle, in general.
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post #18 of 32 Old 12-24-2018, 05:10 PM
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Try moving it around and see where it works the best

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post #19 of 32 Old 02-13-2019, 09:50 PM
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post #20 of 32 Old 02-14-2019, 09:35 AM
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Quote:
Originally Posted by wywindsor View Post
A scale will not tell you how the car will transfer weight. By the above theory you will put more weight to the RR tire. Watch a stock fox leave. It side steps to the RR. Why would you take traction away from the LR. The air bag in the RR spring helped even out the load. So does the anti roll bar. So why would you install the battery over the RR tire?
i dont set my suspension based off weight transfer, i dont want weight transferring to the back.

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post #21 of 32 Old 02-14-2019, 10:18 PM Thread Starter
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So you set your suspension for? This means you already have the weight you want in the rear or the car and the same goes for the front. Please explain.
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post #22 of 32 Old 02-15-2019, 07:28 AM
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So you set your suspension for? This means you already have the weight you want in the rear or the car and the same goes for the front. Please explain.
we dont transfer weight when the car leaves... i'll leave it at that. we run less than a half inch of travel in the front 99% of the time. if we start transferring weight to the rear of the car its getting the front going in the wrong direction.

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post #23 of 32 Old 02-15-2019, 08:03 AM
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Battery relocation rates right up with A/C delete on anything less than a dedicated race car in my book. It wont make a bit of difference on 99.9% of the street cars that see occasional track time. You have to be tuning the suspension pretty seriously to have that weight relocation actually work in a useful positive way. And while your at it, you have to make sure you wire the damn thing correctly.

My car had hot start issues and a battery relocation when I bought it. Investigating the issue revealed that the moron that moved the battery used wire two sizes to small (like the Grinch's heart). It's a wonder the wire didn't overheat and burn the thing to the ground. I moved it back to where it belongs and replaced the wiring with stock sizes as needed. No more hot start issue.

If you move it, make sure you wire it correctly.
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post #24 of 32 Old 02-15-2019, 02:22 PM
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Longitudinal weight transfer is proportional to the cars acceleration times the cg height times the cars mass, divided by the wheelbase. If your car does not transfer weight when accelerating, then you must have found some way to create the inertial dampers from Star Trek.
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post #25 of 32 Old 02-15-2019, 03:56 PM
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I was saying the difference it makes will be obscured by the multitude of other factors in flux on most street cars.
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post #26 of 32 Old 02-15-2019, 05:06 PM
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This is my setup.

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post #27 of 32 Old 02-15-2019, 06:10 PM
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I just pulled about 110+ lbs off of the rear of my car. I doubt that the car will leave the line any differently.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #28 of 32 Old 02-15-2019, 07:17 PM
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Force is proportional to mass times acceleration. It will therefore accelerate faster.

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post #29 of 32 Old 02-15-2019, 07:55 PM
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Force is proportional to mass times acceleration. It will therefore accelerate faster.
It might accelerate faster...but a loss of 100lbs could cause him to spin too. In the big picture, it may go slower if you spin 25% of the way down the track. The only realistic way to know is to test it.

Ff = μmg ...and you just decreased the mass
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post #30 of 32 Old 02-15-2019, 08:18 PM
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Then there is this thing called boost control and traction control and having a fully adjustable front and rear suspension. Plus I may or may not have pulled some weight from the front of the car to offset the rear weight reduction. When the car is racing, the mind is always racing, even when the car is not.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #31 of 32 Old 02-18-2019, 07:20 AM
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i think what im trying to say is coming out wrong...

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post #32 of 32 Old 04-21-2019, 11:47 AM Thread Starter
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I ran a 3/0 wire from my battery to the switch then a Remy distribution block under the rear seat. The starter solenoid is under the rear seat and fed with a 2/0. Same to the starter. I ran a 2/0 from the same distribution block to another block where the factory solenoid was. The alternator has a #4 to the block under the rear seat. The ground is a 3/0 to another distribution block under the rear seat. From there I bonded to the chassis and the block. Both heads are bonded with a #2.

I should have no voltage drop problems. I bonded the heads per Freezy74. They install a lot of Holley EFI systems and found this helps.
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