|Turbocharger Wheels Sizes|
|After researching my options for a turbocharger upgrade it became apparent that a great deal of conflicting information is floating around the internet concerning the make up of the various turbochargers offered for the 86/87 Turbo Regals. In at least one case I was able to find 4 separate wheels claimed for a single turbocharger! The below information has been compiled from many sources both on and off the internet.Once this chart was put together I was still hesitant to post it. I wanted to be sure this was as accurate as possible so, I decided to contact some vendors and ask outright whether they'd be willing to verify the information before it was submitted. One vendor hung up on me in mid-sentence. Two vendors, Jack Cotton of Cottons Performance and John Craig of Limit Engineering were gracious enough to spend a great deal of time on the phone not only verifying the information but also discussing turbochargers, their make up, and applications. The contact information for these two VERY helpful vendors is listed at the bottom of this page.
The trend in compressor size with one exception, tracks predictably with the size of the turbo. Turbine wheels on the other hand are a little less intuitive. Ignoring the TE/TA differences, there are 14 different models in this chart (12 if you compare the TE45/TE63E and TE45A/T66). Even with so many models, three turbine wheels dominate this list with some "smaller" turbos using "larger" wheels or vice versa. To complicate matters further, Jack Cotton pointed out that the behaviour of a turbo can be changed drastically by changing the turbing housing. There are several different housings available with the factory GN/TR 3 bolt exhaust manifold pattern. These housings are manufactured by Garrett, Precision, and Turbonetics and are available in A/R ratios of .63, .82 and .85.
|Models vs. Wheels|
Information verified August 30th 2002 via phone conversation with Jack Cotton of Cottons Performance and John Craig of Limit Engineering.
Cottons Performance Center
Email corrections or additions (like p/n's for wheels or housings) to Charles Brooks (email@example.com)