Perrin Positive Steering Response System PSRS for 2004-2007 STI / 2006-2007 WRX
Perrin Performance Positive Steering Response System for 2004-2007 Subaru STI / 2006-2007 WRX
MANUFACTURER PART #PSP-SUS-403
Improve turn-in and increase handling proficiency with the PERRIN Positive Steering Response System.
WHAT IS PSRS?
P.S.R.S stands for Positive Steering Response System and simply replaces the front control arm rear bushings. The OEM bushings are 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. Eliminating the OEM super soft bushing provides significant improvement in how the car steers during hard cornering and even in a straight line.
OEM BUSHINGS - BAD
Under braking and acceleration, the OEM bushing can flex enough for your wheel to move back and forth .500"! This deflection of the wheel causes drastic toe in and toe out changes under braking. The toe changes will cause steering wandering and an altered tire contact patch. When accelerating, this OEM bushing causes unwanted wheel hop and the car will want to follow the ruts in the road.
PERRIN PSRS - GOOD
After the PERRIN PSRS is installed, under braking the wheel will have zero deflection. Since there is no way for toe changes to occur, the steering feedback issues and wandering under braking disappears. Under acceleration the car will have far less tendency to follow the ruts in the road, wheel hop will be eliminated, and in turn the car will have more front-end traction!
The bushing in the PSRS is purposely offset from center-line. This adds approximately 0.5 degrees of caster to the front suspension. Caster is the angle on which the steering knuckle rotates. Adding caster makes the car turn in faster by providing a larger contact patch as the wheels turn on the steering axis.
"ANTI-LIFT" REDUCTION FEATURE
A byproduct of the PSRS kit is that it reduces some of the built in "anti-lift" that Subaru builds into the suspension geometry. Changing the geometry toward a Pro-Lift setup which means there is more weight transfer happening under acceleration and deceleration. During acceleration this helps transfer weight to the rear of the car creating additional traction for the front tires, which reduces understeer. Same thing happens under braking.
The PERRIN PSRS features custom made Polyurethane Bushings. We choose a stiff 95a durometer material to provide a feel similar to a solid bearing bushing but without the harshness or noise that can be associated with them after years of use. Polyurethane is extremely durable, nearly maintenance free and less expensive than bearing type bushings. PERRIN polyurethane PSRS's were designed for those living in climates where your vehicle is commonly exposed to corrosive elements. The combination of aluminum, polyurethane, and yellow zinc plated hardware make PERRIN performance PSRS's very weather resistant and unaffected by wet climates and road salt. Polyurethan bushings will also transmit slightly less noise through the chassis than more rigid mediums.
The PSRS uses Zerk grease fittings to feed lubricant to the joint without the need to disassemble the PSRS. Grab your grease gun, and grease away!
Condition: 100% Brand New, Never Used or Installed
Availability: Item will be drop ship directly from their distributor and deliver within 6 business days
2004-2007 Subaru STI
2006-2007 Subaru WRX
NOTE: Offset PSRS will push front wheels forward on car roughly .500"
Please inspect your order upon receipt. No damage claims will be honored after 14 days of delivery.
All item we sold come with 60 days defective warranty from the date
We will cover shipping for exchange if we shipped incorrect quantity, incorrect item or defective item
In a case when return is requested, we require the buyer to follow standard RMA procedures by obtaining a RMA number before sending the product back to us.
***Returning an item without following proper procedures will delay the claim process, and we reserve the right to refuse any unauthorized return packages***.
In some occasions we might request images as supporting document for damage/ defective claims to help us determine the best and most effective resolution toward the problem. When this happens, a designated e-mail address will be provided to the buyer so images files can be attached, as the eBay message system does not allow image attachments at the moment.
If you have any questions before buying or after you have purchased the item, please do not hesitate to contact our customer service support team. Our office hours are Monday to Friday 10am-6pm PST , we are off during the weekends and all major holidays and you will be guaranteed that your questions will be replied promptly. Normally we can reply your email within 24hr but if you email to us during weekends, we have to reply to you on the following Monday in the order as it's received. If you have a problem about your shipment, please email us to solve it before leaving a negative feedback.
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