PERRIN EVO Positive Steering Response System......
Sep 27, 2007, 10:44 AM
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PERRIN EVO Positive Steering Response System......
This part has been a long time coming! Finally we are ready to release our PSRS for the EVO! We are showing some sneak peeks of the part to help generate some interest before the final release. We choose to go with black, as this is a new theme we are going with on all of our parts. Mainly for those CA guys!
What is the PSRS?
In the Subaru world, these kits are known as the ALK or Anti-Lift-Kit. The anti-lift part of the kit is a very small feature compared to the benifits of the solid type connection the PSRS makes. Eliminating the OEM super soft bushing provides significant improvement in how the car steers during hard cornering and even in a straight line. So P.S.R.S stands for Positive Steering Response System. The PSRS replaces the front control arm, rear bushing. This OEM bushing is designed to be extra compliant to reduce NVH, and make the ride more comfortable. The compliancy of this bushing is not something a performance oriented driver is looking for.
OEM Bushings Installed
Under braking, this OEM bushing has enough flex in it to cause the wheel to move back and forth .300"! This deflection of the wheel causes drastic toe in and toe out changes under braking. These toe changes will cause steering input changes, cause the tires contact patch to change, and even wondering.
When accelerating, this OEM bushing causes unwanted wheel hop, and again toe in and toe out changes. During acceleration, the car will want to follow the ruts in the road, as the bushing flexes back and forth. This is one of the most noticeable changes.
PERRIN PSRS Installed
Under Braking, after the PERRIN PSRS is installed, the wheel will not move front to back period! Since there is no way for toe changes to occur, the steering feedback issues, and wondering under braking all goes away!
Under Acceleration, after the PERRIN PSRS in installed, wheel hop disappears, the car will have far less tendency to follow the ruts in the road, and in turn the car will have more front end traction.
Adds Caster
Besides removing all the unwanted flex of the OEM bushing, our PSRS has an offset to where the bushing is mounted. This allows the installer to add almost 1.5 degrees of caster to the front suspension. Caster is the angle at which the steering knuckle rotates on. Adding caster makes the car turn in faster by providing a larger contact patch as the wheels turn on the steering axis. Think of it like camber for your steering!
If there are any questions about the part, and what it does, why you would want it, or anything feel free to ask, thats why we are here! The part will start shipping to dealers and customers in less than 4 weeks!!
What is the PSRS?
In the Subaru world, these kits are known as the ALK or Anti-Lift-Kit. The anti-lift part of the kit is a very small feature compared to the benifits of the solid type connection the PSRS makes. Eliminating the OEM super soft bushing provides significant improvement in how the car steers during hard cornering and even in a straight line. So P.S.R.S stands for Positive Steering Response System. The PSRS replaces the front control arm, rear bushing. This OEM bushing is designed to be extra compliant to reduce NVH, and make the ride more comfortable. The compliancy of this bushing is not something a performance oriented driver is looking for.
OEM Bushings Installed
Under braking, this OEM bushing has enough flex in it to cause the wheel to move back and forth .300"! This deflection of the wheel causes drastic toe in and toe out changes under braking. These toe changes will cause steering input changes, cause the tires contact patch to change, and even wondering.
When accelerating, this OEM bushing causes unwanted wheel hop, and again toe in and toe out changes. During acceleration, the car will want to follow the ruts in the road, as the bushing flexes back and forth. This is one of the most noticeable changes.
PERRIN PSRS Installed
Under Braking, after the PERRIN PSRS is installed, the wheel will not move front to back period! Since there is no way for toe changes to occur, the steering feedback issues, and wondering under braking all goes away!
Under Acceleration, after the PERRIN PSRS in installed, wheel hop disappears, the car will have far less tendency to follow the ruts in the road, and in turn the car will have more front end traction.
Adds Caster
Besides removing all the unwanted flex of the OEM bushing, our PSRS has an offset to where the bushing is mounted. This allows the installer to add almost 1.5 degrees of caster to the front suspension. Caster is the angle at which the steering knuckle rotates on. Adding caster makes the car turn in faster by providing a larger contact patch as the wheels turn on the steering axis. Think of it like camber for your steering!
If there are any questions about the part, and what it does, why you would want it, or anything feel free to ask, thats why we are here! The part will start shipping to dealers and customers in less than 4 weeks!!
Sep 27, 2007, 12:11 PM
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Forgot to put that! $229.99 is our price.
NVH is not noticable on cruising and normal driving stuff. When pushing hard, at higher speeds (like 80+) its a little lounder, but not as loud as soild strut tops.
The ONLY time they are harsh is on big pot holes. Its like the difference between 17s and 19's when running over a pot hole.
The ONLY time they are harsh is on big pot holes. Its like the difference between 17s and 19's when running over a pot hole.
Sep 27, 2007, 12:31 PM
#7
NVH is not noticable on cruising and normal driving stuff. When pushing hard, at higher speeds (like 80+) its a little lounder, but not as loud as soild strut tops.
The ONLY time they are harsh is on big pot holes. Its like the difference between 17s and 19's when running over a pot hole.
The ONLY time they are harsh is on big pot holes. Its like the difference between 17s and 19's when running over a pot hole.
A pic of them mounted would be really cool and help people visualize how important replacing that front control arm rear bushing is.
- Andrew
Last edited by GTWORX.com; Sep 27, 2007 at 12:33 PM.
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Sep 27, 2007, 01:10 PM
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Sep 27, 2007, 04:24 PM
#10
This goes on the control arms on the front of the car, not the rear like the Whiteline bumpsteer kit. Different parts, different ends of the car. You can use them both.
The bushing this replaces is usually a big cause of dynamic caster loss under cornering.
Whiteline does have another poly bushing for the same part, but it's obviously not quite as drastic a mod as this spherical bearing part. And no geometry change (extra static caster) either.
- Andrew
The bushing this replaces is usually a big cause of dynamic caster loss under cornering.
Whiteline does have another poly bushing for the same part, but it's obviously not quite as drastic a mod as this spherical bearing part. And no geometry change (extra static caster) either.
- Andrew
Last edited by GTWORX.com; Sep 27, 2007 at 05:18 PM.
Sep 27, 2007, 04:39 PM
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Actually bump steer is a different thing. This is normally something that is fixed by changing the height where the tie rods bolt to the steering knuckle. There is certain spec for length and angle with the wheels turned, and the suspension moving up and down. When you raise and lower the wheel, it changes these specs and causes an abnormally high amount of toe in or out when the wheels turn and go over bumps. I am sure someone could explain it better, but that is the basic idea.
The PSRS adds caster which is like camber when you turn the wheel. It allows for static camber to closer to zero (better traction for braking and accelerating) but when the wheels turn it addes more camber. Some say there is never too much caster, but most race cars run around 4-5 degrees. The EVO spec is 3 degrees i believe.
Then of course it gets rid of that rubber bushing.....
The PSRS adds caster which is like camber when you turn the wheel. It allows for static camber to closer to zero (better traction for braking and accelerating) but when the wheels turn it addes more camber. Some say there is never too much caster, but most race cars run around 4-5 degrees. The EVO spec is 3 degrees i believe.
Then of course it gets rid of that rubber bushing.....
Sep 27, 2007, 04:51 PM
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I wonder if we can run this in STU? This is poly correct? Not sure about the metal in the bushings
center though.
I agree with Andrew Jeff. We need to see a picture of this installed please.
center though.
I agree with Andrew Jeff. We need to see a picture of this installed please.
Last edited by Dave Mac; Sep 27, 2007 at 04:56 PM.
Sep 27, 2007, 04:55 PM
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Nope, this goes on the control arms on the front of the car, not the rear. The bushing it replaces is usually a big cause of dynamic caster loss under cornering.
Whiteline does have a poly bushing for the same part, but it's obviously not quite as drastic a mod as this spherical bearing part. And no geometry change (extra static caster) either.
- Andrew
Whiteline does have a poly bushing for the same part, but it's obviously not quite as drastic a mod as this spherical bearing part. And no geometry change (extra static caster) either.
- Andrew
I looked at the Whiteline stuff and it is very different. But a good idea to go with your car. But my experience with lowering cars is lower it and make sure the control arms are nearly flat to the ground, or slightly pointing down from the center. This keeps the suspension from compresing more while going around corners.
Sep 27, 2007, 05:01 PM
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DAMN!! Should have refreshed again!
DaveMAC,
For STU, they would not be legal. The "No metal for bushings" rule makes these bad. But good because they work good. We can make some in delrin, but the problem is how long they might stay tight. The teflon lined bearing stays nice and tight for a long time.
SpeedElement,
Thanks! Maybe we can get one on your race car!!
DaveMAC,
For STU, they would not be legal. The "No metal for bushings" rule makes these bad. But good because they work good. We can make some in delrin, but the problem is how long they might stay tight. The teflon lined bearing stays nice and tight for a long time.
SpeedElement,
Thanks! Maybe we can get one on your race car!!