These high quality rising rate performance lowering springs were devised by John Powell drawing on his experience building race Cobalts for General Motors Performance Division. Engineered by Hyperco out of the USA. Hyperco have supplied the springs for every winning Indianapolis 500 race car since 1960...
Accepted overwhelming by the Cobalt Nation, now on the 7th production series. V.1 was a slightly higher spring in trim height as racing experience pointed to the need for higher trim heights especially at the rear for best performance. Keep in mind that the Cobalts Powell RaceShop built for Time Attack and Grand Am racing had lowered rear twisting beam spindles and different front Shocks.
Customers asked John to squeeze a lower trim height out of the package, so we re-engineered the coiling and came up with v.2 et seq.
Lifetime warranty. We guarantee purchasers that these springs will never lose rate or break. Ever.
Going on 7 years now, we have never had a return.
With an adapter kit (available separately) these springs can be installed on all Ion Redlines and even base Ion coupes and sedans.
Works best with Bilstein rear shocks (available separately) and a new front Bilstein Shock, John Powell is working on that, goal is to be available in late winter 2018/19 (exclusively from ZZPerformance)
These Will Fit 2005-2010 Cobalts.
Note: Version X. Just The Latest Build.
Note: Current YYZ Springs Come With Sound Insulator Sleeves On Them.
Included in Package:
2 Front Powell YYZ springs
2 Rear Powell YYZ springs
Note: Current YYZ springs come with sound insulator sleeves on them
FRONT: 0.532” wire diameter (High Tensile Chrome Silicon spring wire), nominal 11.625” Free length. Variable rate 138/265#/in
REAR: 0.485” wire diameter (High Tensile Chrome Silicon spring wire), nominal 11.250” free length. Variable rate 105/325#/in
Trim height: compared to v1, drop additional 0.350-0.400”Front and 0.750” Rear
Using lowering springs may void the warranty on stock struts.
Note: Please include your VIN in the comments field once you place your order for warranty
Warranty is 100% guarantee that they will not break or lose rate for as long as you own the car. Requires owner to be diligent with cleaning and using corrosion protection on springs if the car is winter driven. If they break or lose rate the springs will be replaced at no charge free shipping.
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