History Of The Turbo Cast Wheel
During prototype testing of the third gen pontiacs in the late 1970's.Pontiac wanted a sleeker,More aerodynamic car.So GM's engineer's took the idea of the Bonneville salt flat land speed car's which had flushed aero wheels and incorporated it into the Turbo cast wheel design and Bowling ball cap.The "vents" on the Turbo Cast wheel actually are there to help cool the brakes,While the Bowling Ball Cap,Or "Aero Wheel Covers" which is what Pontiac called them,Were designed for aerodynamics.
So which cars got Turbo Cast Wheels ? Well I have the official info from Pontiac and other reputable sources.
The RPO code N89 Turbo Cast wheels were only available on the 1982-1984 Firebird,Firebird S/E & Trans Am:
1982 Base Firebirds can only get 14" Turbo cast with the Level 2 or 3 suspension.
1982 Firebird S/E came with 14" Turbo Cast wheels as standard equipment.But if WS6/7 suspension was ordered it would have the 15x7 Turbo Cast wheels.
1982 Trans Am was the same as the S/E.But after July of 1982 there was shortage of N89 Turbo Cast wheels and some car's instead received the similar N21 Turbo finned wheels with the center cap (Small caps) as a no extra cost option.
1983 Firebird S/E or Trans Am only (Early production car's could be ordered with N89 Turbo Cast Wheels)
1984 Firebird S/E And Trans Am:Only the 14x7 Turbo Cast wheels could be ordered on S/E and Trans Am (And not where made for this year)
After total Production numbers were calculated around 36,292 1982 cars were ordered with RPO N89 15X7 Turbo Cast Wheels.
This is Official information from a source at PHS (Pontiac Historical Services) and I'm the ONLY one to release this info to the public.
1982 15X7 N89 Breakdown by cars:
Firebird S/E - 2387
Trans Am W/
LU5 - 3894
LG4 - 5365
TURBO CAST WHEELS PRICES 2012
Prices inlclude FED EX Ground shipping to lower 48 only.
(4) 15" Turbo Cast wheels $1450 AS OF 3/2012 INSTOCK.BUT HURRY LIMITED SETS AVAILABLE !!!!!
(4) 15" Turbo Cast wheels and with Bowling Ball Caps (Please email for availabilty)
(4) 14" Turbo Cast wheels NO CAPS $465
(4) 14" Turbo Cast wheels with Bowling Ball Caps $700
Turbo Cast Wheel Specifications
15" Turbo Cast Wheel:
Manufacture: Modern Wheel,Rockwell-International,Kelsey-Hayes
Weight: 18 LBS.
16" diameter Square and 8" width,
Backspacing : 4.5"
Bolt pattern : 4.75"