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NA to Turbo II conversion - Stage I (basic)

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When people refer to a turbo conversion on a 2nd gen RX-7, it could mean one of 3 things: 1) custom fitting a turbo and other required parts of the system onto the nonturbo engine, keeping the drivetrain stock. This is the least... See more » When people refer to a turbo conversion on a 2nd gen RX-7, it could mean one of 3 things: 1) custom fitting a turbo and other required parts of the system onto the nonturbo engine, keeping the drivetrain stock. This is the least expensive (in most cases) method for turbo'ing your NA car, however it is also by far the least desireable. Keep in mind most people's nonturbo is still on the original engine, or at very least a high mileage replacement. Adding the additional stress of boost, even if done properly, is asking too much from a tired old engine. Not to mention that nonturbo engines are high compression internally, and the intake is not set up for boost (6 port variable intake). There is also much custom rigging involved in this setup, and by the time you do everything that needs to be done you have a hacked up engine bay and almost as much money as a true turbo conversion (see below) could have cost you. The only way this setup is to last is to keep boost way down, or rebuild the engine beforehand, either one is not much fun. For some information and parts list on this type of swap, you can check out the following thread posted by a fellow who did this and photo documented the process. Please give all credit to the original author. This writeup is not to be taken as "the only way" to do the swap, but gives you a good idea of what would be expected to make it work. http://www.rx7club.com/forum/showthread.php?s=&threadid=88540 2) Take all the stock engine parts out of a turbo II to put into your car, just the engine itself and all the electronics that are required to operate it in stock form, not the turbo drivetrain (for instance if you cannot find one). This would retain your nonturbo drivetrain. This is not highly recommended, but can be done successfully depending on the driver. To do this you would need, at very minimum, an upgraded clutch and pressureplate to avoid major slippage of the clutch under boost. You just bolt an NA flywheel onto your new t2 engine and everything bolts together just like it did. Below is a parts list that is the basic minimum for doing this type of swap, along with basic instructions. 3)Take all the stock parts out of a turbo II to put into your car, everything from front to back including the drivetrain. This is considered the "proper" way to do the conversion, and will result in the longest lasting choice. Below is a parts list along with basic instructions for this swap. SO WHAT DO I NEED TO BUY? --Here is a helpful guide to what you need to look for. **The following list is for the "engine only" swap as listed in #2 above.** **Note that there is a BIG difference between the 87-88 turbo parts that fit 86-88 nonturbo cars, and the 89-91 turbo parts that fit 89-91 NA cars. IT is not adviseable to try and mix and match any of these parts. IF you have an 86-88 (s4) car, you need to obtain all 87-88 matching turbo II stock parts for use in the car. IF you have an 89-91 (s5) car, you need to obtain al the 89-91 matching parts for use in your car. Note also that 89-91 turbo parts are becoming EXTREMELY RARE AND EXPENSIVE. IT is much easier to find and afford all the 87-88 turbo parts in contrast to the 89-91 parts.** * Complete turbo engine with intercooler * Left-hand drive spec turbo wiring harness * Turbo ECU (jspec ecu will work) * *only for 87-88 turbo* knock control box, a small silver box up inside the passenger kick panel that plugs into the wiring harness. On 89 and later setups, the ecu handled this function. * turbo boost sensor. * Turbo throttle cable. 87-91 are interchangeable. * Stock turbo fuel pump (87-91 turbo pumps are the same, but the bracket is not) or upgrade such as walbro 255. A rewire for full voltage from the fusebox is also recommended, as well as a re-ground in the hatch to bare metal, a new pickup screen and fuel filter. * Stock turbo intake duct with blow off valve (if not present on engine already). The 87-88 TID is smaller than the 89-91, but either can be used in place of the other. Blow off valves are slightly changed but basically the same. * Stock t2 See less »

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about how much do knock boxes for an 1988 rx7 typically cost?

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NA to Turbo II conversion - Stage I (basic)

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