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Originally Posted by Bryan@BNR
...I am a newbie and what I do for a living is design and manufacture turbocharger upgrades for all kinds of cars.
I have a MKIV customer right now that sent me a set of turbochargers to upgrade. I need to know what are the do's and don'ts and what their limits are. I will not be reusing the old CHRA's. The turbochargers will have 100% all new parts in the CHRA's and will be built for big boost. This upgrade will not just be a larger compressor machined to fit the factory turbine wheel. I know the stock turbos are weak and cant handle too much boost for very long.
I am here to gather ideas that will get you what you want and need.
My business is well known in the RX7 community. Our business holds the HP record on factory based twin turbo upgradess and also holds the record for the older RX7 single turbo upgrades as well. I want to offer you guys the same...
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The tiny, pencil-thin shafts are the weak point in the oem twins. If you can machine out the housings to accept a larger shaft, then you'll probably be able to put on some larger wheels and have the result be reliable. Fwiw, as far as I know (and I've been heavily involved in the Mkiv community since early '98 ... and owned an Mkiv since early '94), every single attempt to put larger wheels on those oem pencil-thin shafts has failed within a few thousand miles of driving.
...so to boil that down: first and foremost, the upgrade >>>must<<< be reliable.
Secondly, the more horsepower the better. I honestly can't imagine any size of wheel you could fit into the oem housings that would be too large for the needs of the Mkiv Supra community.
Please keep us informed, and feel free to
contact me to discuss further.