She gets a little squirrelly on hard acceleration

[Billnchristy]

Meaning I have to make several small corrections to stay straight, nothing violent.

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[SuperDave150]

Now that I have the procal tune and exhaust I have noticed if I get hard on the throttle I have provide steering input to keep her straight. I'm not a suspension guy so I'm not sure what I'm looking for here. I have noticed that if I am at highway speeds and hammer down the rear end of the truck will squat now as she rockets off toward the limiter, maybe we're unloading the front too much?

I haven't tried it in 4a to see if it makes a difference.

After thinking about the squat, rear sway bar?

2.7 with tune and exhaust
sasquatch
2 door
black diamond

Yup, noticed that my 2.7 4 door squats like a stadium truck. Because that’s how it is sprung. I kinda like it.

 

[Billnchristy]

Can’t lift that wheel in the turns though

We saw them at Bristol, awesome series

 

[Techun]

A rear sway bar will help, and 4a will definitely help, but remember it has a lot of suspension travel.

A rear sway bar will affect the suspension left to right. If the entire rear end is squatting it will do nothing.

 

[AZ_Liberty]

My mustang got squirelly too. Trick is to turn off the stupid traction control.

 

[goatman2]

Now that I have the procal tune and exhaust I have noticed if I get hard on the throttle I have provide steering input to keep her straight. I'm not a suspension guy so I'm not sure what I'm looking for here. I have noticed that if I am at highway speeds and hammer down the rear end of the truck will squat now as she rockets off toward the limiter, maybe we're unloading the front too much?

I haven't tried it in 4a to see if it makes a difference.

After thinking about the squat, rear sway bar?

2.7 with tune and exhaust
sasquatch
2 door
black diamond

The rear is linked with a track bar. Ford did a great job with the track bar being long and level, still with a track bar the axle will move very slightly side to side as the suspension travels up and down. The track bar locates the axle side to side, and the arc of it's movement will allow a very slight shift in the centering of the rear axle. I guess there is some chance that under hard acceleration there can be enough squat, combined with the torque of the motor, to create a slight bit of bump steer.

 

[GreyZ]

The rear is linked with a track bar. Ford did a great job with the track bar being long and level, still with a track bar the axle will move very slightly side to side as the suspension travels up and down. The track bar locates the axle side to side, and the arc of it's movement will allow a very slight shift in the centering of the rear axle. I guess there is some chance that under hard acceleration there can be enough squat, combined with the torque of the motor, to create a slight bit of bump steer.

This is probably the most likely answer

 

[Billnchristy]

That sounds like an excellent explanation

 

[Oldhippie]

Take a look at race trucks accelerating...cornering...

 

[TRDFurgesson]

If by "steering input" you mean having to hold on to the wheel, that is normal. If you mean that it gets ripped out of your hands during acceleration while driving straight, that isn't normal.

If loosing rear traction is the issue, then 4A should help prevent that. That is why sport mode defaults to 4A. Torque steer could an issue in 4A (Raptor with aggressive trans tune and LSD will torque steer in 4A while cornering under acceleration).

The GT500 will squat, twist, and lift front under acceleration, so the soft springs of Bronco don't stand a chance even with relatively low torque. The squat/lift is more pronounced on 2dr. Totally normal.

In any case, this is partly why Ford detunes the engine and transmission response in stock Bronco.

The FP Bronco 2.7 tune has seemed pretty mild so far, especially compared to Cobb tune on Raptor. Unlike Raptor, Bronco tune is fairly usable in 2H with 37's. I like it a lot, since if fixes the slow downshift and throttle response.

Glad I didn't get a 500... Sounds like a real handful...

 

[JohnnyBronco]

What you're describing sounds like "Torque Steering"...its very common in FWD and is totally normal.

Sure, in a FWD, but unless something is broken you cannot drive a Bronco in FWD mode

 

[MileHighCitizen]

Sure, in a FWD, but unless something is broken you cannot drive a Bronco in FWD mode

There are two kinds of people in this world...

1. Those who can extrapolate from incomplete data

 

[2020FordRaptor]

My mustang got squirelly too. Trick is to turn off the stupid traction control.

So it just spins the tires??????

 

[HeliPilot]

If by "steering input" you mean having to hold on to the wheel, that is normal. If you mean that it gets ripped out of your hands during acceleration while driving straight, that isn't normal.

If loosing rear traction is the issue, then 4A should help prevent that. That is why sport mode defaults to 4A. Torque steer could an issue in 4A (Raptor with aggressive trans tune and LSD will torque steer in 4A while cornering under acceleration).

The GT500 will squat, twist, and lift front under acceleration, so the soft springs of Bronco don't stand a chance even with relatively low torque. The squat/lift is more pronounced on 2dr. Totally normal.

In any case, this is partly why Ford detunes the engine and transmission response in stock Bronco.

The FP Bronco 2.7 tune has seemed pretty mild so far, especially compared to Cobb tune on Raptor. Unlike Raptor, Bronco tune is fairly usable in 2H with 37's. I like it a lot, since if fixes the slow downshift and throttle response.

These are my observations as well on my 2.7 FP tune, 2door on 37s

 

[HeliPilot]

Sure, in a FWD, but unless something is broken you cannot drive a Bronco in FWD mode

Doesn’t need to be front wheel drive only, happens in AWD as well. That’s what my TRX is, and as stated, it will change lanes if you’re not compensating when you nail the throttle.

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