Hey guys, I'm pretty new to mustangs and even more so having a powerful car such as the 5.0. I'm not sure how to say this without sounding like a ***** but here goes: I think that when under full power the rear torque steers way too hard and it feels like the rear is flexing or diving down. I even have to let off the gas at the end of 2nd gear at WOT. I feel like the car is going to steer off sideways if I keep the power on. I've attended one autocross event with this car and it was just a beast but I felt like I'm wrestling with it.
I came from a E46 M3 so the difference is huge; I'm used to confidence inspired steering and turn in and manageable power, so this is a step further than I'm used to. Can anyone recommend some suspension mods to keep the power in check?
I've just purchased a set of H&R Super Sports and a Boss Strut Brace to keep it in check but I haven't installed them yet so; I'm hoping it will help but I don't think it will resolve the issue of the torque steer.
Thanks again! Oh and I just got it back from the bodyshop! Here's a pic of the rear.
Welcome to the Mustang world! The Mustang community is very large, yet, so small...I think you will have a great time modifying your car and meeting other Mustang owners who share the same passion as yourself.
I agree with the above statement about the handling improvement from the springs, and think you will be very happy with those considering your previous car experience.
I also agree with the recommendation on the Adjustable Panhard Bar. There are quite a few to choose from, so I recommend going with a quality piece made in the U.S.A.
When lowering the car, it will be in your best interest to adjust/correct the pinion angle. Me, personally, I do not recommend adjusting the pinion angle with the Lower Control Arms. I highly recommend non-adjustable Lower Control Arms
and an Adjustable Upper Control Arm
. There are a few reasons for this, first being, the margin for error in adjusting the LCA instead of the UCA is quite large. You have to ensure both are exactly the same, while hitting your target pinion angle. You have to be very careful of your thrust angle, as well. One complaint I commonly receive when customers use the LCA to adjust pinion angle is, they usually seem to move the tires too much within the fenderwell.
*Lowering the car substantially without correcting the pinion angle has shown to cause premature leaks from the pinion seal, abnormal wear on differential components, including bearings, increased noise in the cabin, and unnecessary drive shaft bind.
If you put a generous amount of mileage on your car each year, you will also want to correct the camber. When you lower the car, you will gain negative camber up front. This camber works well for handling, but can be a bear on the front tires. There are many options on the market, including camber-bolts and camber plates. You can also slot the strut mounting hole locations as well, but most do not choose to go that route. The camber bolts are the cheaper route, but of course, the camber plates are going to work better. With the better camber adjustment also comes a premium price, in comparison to the bolts.
If you are concerned with traction after these modifications, there is a solution, and they are called lower control arm relocation brackets. These will help tremendously with traction and wheel-hop.
When you lower the chassis of the car, the front mounting point of the LCA is also lowered. The rear mounting point is attached to the axle, so that point does not drop. An S197 will perform best with a parallel LCA, or even having an angle that protrudes "upwards" towards the chassis of the car, from the rear axle. When lowering, the arm will angle "downward" towards the chassis, from the axle.
This downward angle throws your instant center point way out of wack, much lower and further out to the point where excessive rear squatting and tire spin can become an issue.
Here is a good example of our Relocation Brackets and Billet Aluminum LCA's on an American Muscle customer's car:
So, I hoped that helped a little.
If you have any questions, please feel free to ask or even give me a call. I talk suspension all day, everyday, and would love to assist you with your suspension planning.
Check out our web-site when you get a chance. We have the largest selection of S197 Suspension pieces in the industry, designed, manufactured, tested, coated, packed and shipped right here in the good ole' USA.
BMR Suspension S197 Suspension Components