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Old 01-12-2010, 05:19 PM   #1
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Pfadt or Eibach

What are the pros and cons between Pfadt and Eibach lowering spring and sway bars? I'm real close to ordering one or the other. Need ur feedback. Thank you everybody
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Old 01-12-2010, 05:29 PM   #2
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I considered Eibach, Peddlers, Detriot Speed, Hotchkis and went with Pfadt Sport Sway Bars - I pm'd Aaron Pfadt who was great to answer all my questions about why his design and product, merits of hollow versus solid sways (his are solid front, hollow rear) and what to expect in performance. He was professional, didn't dis the competition and was patience with my back & forth. I'm having them installed by East Coast Superchargers in NJ next week.

I also discussed the springs versus coil overs - I am leaning toward the Pfadt coil overs but would decide at / near my Supercharger decision.

pm Aaron with your questions.
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Old 01-13-2010, 09:23 AM   #3
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We worked very closely with Pfadt, and I have an exerp from Aaron that I feel does his products a lot of explanation, and maybe if you have questions after this point we can move forward, but this should be a good start on why Pfadt makes the suspension package they do.

"Fast forward to Pfadt making 2010 Camaro suspension. I'd like to throw out my 2 cents on swaybars. Swaybars, more properly called stabilizer bars or anti-roll bars are used to help the handling on any car. Most production cars now come with at least one in place, generally on the front. The Camaro in all of its forms comes with both a front and a rear. The reason that they are used is to limit body roll in the turns. This make the chassis more responsive. The cornering forces go into accelerating the car rather than into body roll. It is important to keep in mind that you can achieve roll stiffness through sway bars, but you can also achieve the same thing through your springs. They both contribute roll stiffness. The reason that the auto manufacturers rely on the sway bars is because they have much less negative consequences in terms of ride quality than achieving a certain level of roll stiffness through just springs. The sway bars are not active in situations where both front or rear wheels are doing the same thing. For example, in the case of a large heave in the road, the sway bars will have no effect on how the cars feels going over it, because both front tires will go over it at the same time and the bar will just rotate in its mounts. If you hit a pothole with one tire the sway bar stiffness will have an effect on the amount of disturbance in the car. The bottom line is that a large amount of roll stiffness is used on 'sporty' street cars because it has a good balance of handling versus ride quality.

For us in the aftermarket, we tend to want to expand on that principle and increase the roll stiffness even more for better handling. The increase in handling comes in three main forms.

1. increase in responsiveness
2. better tire grip due to less roll and an improvement in contact patch
3. improvement in vehicle dynamic balance

The responsiveness comes from a net increase in roll stiffness in the car. That can come from the front or the rear, but generally is done with a combo of both. The better cornering grip comes from reducing the amount of tire contact patch loss that is associated with body roll. In the case of a Macpherson strut car like the Camaro, there is almost no camber recovery from the suspension, so any body roll is tire roll and loss of contact patch. That is why you see such crazy amounts of negative camber dialed into Macpherson strut equipped race cars. They will often run 4 or 5 degrees of negative camber to compensate for the body roll. The rear of a Camaro has reasonable camber recovery, but you still lose camber with body roll so reducing roll is important for maintaining contact patch.

The third and most complicated component is the balance. This manifests itself in oversteer and understeer. Roll stiffness overall is important but the balance of front roll stiffness to rear roll stiffness is of critical importance. To calculate that, you need to know not only the sway bar stiffness but also the stiffness of the springs, because like I described earlier the roll stiffness is generated by both the springs and swaybars. The desired amount of front roll stiffness versus rear roll stiffness is a function of a whole lot of things - tire size, front rear weight distribution, aerodynamic balance, etc... - but it can be calculated. The bottom line is that we make some calculations, compare them to some known information from testing and then test ourselves. The Camaro is well known on these forums to have a large bias towards understeer from the factory. It is also important to note that even with the stock suspension, the majority of the roll stiffness (well over 50%) comes from the sway bars. This means that even with a radical spring change, the roll stiffness balance is going to be hard to shift in a meaningful way. If you want to fix the understeer, you need to start with the sway bars.

At Pfadt we did just that. We came up with a swaybar package that we know adjusts the balance of the Camaro from understeering nightmare to a nimble track machine. I won't get into a lot of meaningless numbers to confuse you, but I can tell you that we added a reasonably large amount of rear roll stiffness to do this. We also added some front stiffness, but the rear is the key. You can see that by looking at the diameters of our bars. An interesting note on that, you will notice that our rear bar is 35mm in diameter. That seems huge, especially in comparison to the front at 26mm. That is a function of the differing motion ratios of the front and rear sway bars. The roll stiffness imparted by each is very similar, but the rear bar hooks to the control arm very far inboard and therefore is subject to a lot of leverage (ie Motion Ratio). The front bar on the other hand hooks directly to the strut and is very close to a Motion Ratio of 1 which means that it is more effective and can be smaller and achieve the same roll stiffness for the car.

By getting this basic balance in place, we can than put on springs of a wide range and the car will still keep it's inherent balance. We can then specify our springs to meet the needs of the customer. A dedicated track car is going to be able to stand a lot more spring rate than a dual purpose car or even a street only car. We also put some adjustment in our swaybars to allow the end user to tune for different tire combinations, track conditions and driving styles.

Our bars increase overall roll stiffness to help response and contact patch, but most importantly they impart a handling balance to the Camaro that it lacks from the factory. I could tell you how to calculate sway bar rates and roll stiffnesses, but that does not really mean anything on it's own. What matters is that we have the capability to do the analysis and then put our products on the track to test them so that you have a handling package that will take whatever you throw at it."

If you like as well, PM me for current pricing on their products for Camaro5 members.

Regards
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Old 01-13-2010, 11:19 AM   #4
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Outstanding Brandon - thanks for posting this - I was very impressed with Aaron from our dialogue and his excerpt is very informative and helps explain the mechanics as well as the performance implications.
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Old 01-22-2010, 09:25 AM   #5
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Originally Posted by DTS2SS View Post
What are the pros and cons between Pfadt and Eibach lowering spring and sway bars? I'm real close to ordering one or the other. Need ur feedback. Thank you everybody
I've installed Pfadt's sway bars and rear diff poly mounts so far. Coil overs and 16 piece poly control arm bushings/sleeves coming soon. Sway bars made a huge improvement and from posts I've read, meeting with Pfadt at SEMA, calls to their staff, etc - they are a top notch company with well engineered products. They also don't overload you with meaningless discussions, but rather explain in terms everyone can understand (but will get deep into engineering IF your looking that direction and ask for the DEEPER details). Aaron always seems to think his responses out before opening his mouth too - doesn't make quick off the cuff posts in the fury of the discussion like another vendor does. He releases products, install instructions, and makes posts AFTER they are well thought out and doesn't get emotional.... very level headed. I don't think you can go wrong with Pfadt - and USA made for a bonus!
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Old 01-22-2010, 09:41 AM   #6
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One of the main reasons I chose Pfadt is that we have direct access and open communications with the people who build, design, and test the products. We get concise engineering reasons, not just a sales pitch from a salesperson. I'm very impressed with their professionalism.

Tony
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Old 01-22-2010, 09:43 AM   #7
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Quote:
Originally Posted by Blue70SS View Post
I've installed Pfadt's sway bars and rear diff poly mounts so far. Coil overs and 16 piece poly control arm bushings/sleeves coming soon. Sway bars made a huge improvement and from posts I've read, meeting with Pfadt at SEMA, calls to their staff, etc - they are a top notch company with well engineered products. They also don't overload you with meaningless discussions, but rather explain in terms everyone can understand (but will get deep into engineering IF your looking that direction and ask for the DEEPER details). Aaron always seems to think his responses out before opening his mouth too - doesn't make quick off the cuff posts in the fury of the discussion like another vendor does. He releases products, install instructions, and makes posts AFTER they are well thought out and doesn't get emotional.... very level headed. I don't think you can go wrong with Pfadt - and USA made for a bonus!
Thanks! Glad to see that our efforts to provide intelligent useful information are appreciated. We have staff on this forum every day. Feel free to ask questions, we're happy to help

-Aaron
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Old 01-22-2010, 10:47 AM   #8
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I had my Pfadt Sport Sway Bars installed yesterday at their Authorized Dealer East Coast Supercharging (ECS) in Cream Ridge, NJ - http://www.eastcoastsupercharging.com/ . Install was superb so thanks to Chris, Doug and Mike at ECS. Pic is of rear Sway Bar install, the exhaust is the Solo Performance XLT V6 Cat-Back - sorry for the picture quality.

On the 80+ mile return from ECS I could immediate feel the positive performance of the Sport Sway Bars over stock - cornering was sharper, front clip was level and no understeer. Well worth the investment in a product Pfadt engineered specifically for the 2010 Camaro.

Many thanks to Aaron and the entire Pfadt team for a great product. I am strongly considering their Coil Overs for a summer install once I've got the 20" Summer Pirellis on (running 20" Blizzak LM-60s for the Winter) and experience the Sport Sway Bars with the summer tires/conditions.
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Old 01-22-2010, 10:49 AM   #9
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another vote for Pfadt here
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Old 01-22-2010, 12:07 PM   #10
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Originally Posted by tjd24 View Post
I had my Pfadt Sport Sway Bars installed yesterday at their Authorized Dealer East Coast Supercharging (ECS) in Cream Ridge, NJ - http://www.eastcoastsupercharging.com/ . Install was superb so thanks to Chris, Doug and Mike at ECS. Pic is of rear Sway Bar install, the exhaust is the Solo Performance XLT V6 Cat-Back - sorry for the picture quality.

On the 80+ mile return from ECS I could immediate feel the positive performance of the Sport Sway Bars over stock - cornering was sharper, front clip was level and no understeer. Well worth the investment in a product Pfadt engineered specifically for the 2010 Camaro.

Many thanks to Aaron and the entire Pfadt team for a great product. I am strongly considering their Coil Overs for a summer install once I've got the 20" Summer Pirellis on (running 20" Blizzak LM-60s for the Winter) and experience the Sport Sway Bars with the summer tires/conditions.

Thanks for the business Tom! Pleasure meeting you, I'm glad your pleased with your sway bar purchase.
If you do decide to go with the coil overs, your going to amazed with the performance difference in the car. Aaron and his crew have proven to us to provide the pinnacle in suspension products, with plenty of hands on experience and knowledge to go along with it.
I have their coil overs in my C5, and this season we became the first shop to break into the 1.2 60' range at the drag strip, yet my street driving is great. You will not be disappointed!!

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