Converting back to non-turbo questions

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housecall55
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Joined: Sat Oct 20, 2018 4:45 pm
Your car is a: 1982 124 Spider

Converting back to non-turbo questions

Post by housecall55 »

Does anyone here have experience turning a Legend Turbo back into a non-turbo? I have an 82 Legend Industries Turbo Spider that had blown a motor. I rebuilt it as a non turbo. As I near the end of hooking everything back up, I'm wondering what I need to do to take everything back to the way it would it would have come from the factory, before the Legend conversion to turbo, especially in terms of wiring and ECU. I'm betting someone else has faced this. Thanks.
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aj81spider
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Your car is a: 1974 Fiat 124 Spider
Location: Chelmsford, MA

Re: Converting back to non-turbo questions

Post by aj81spider »

There are wiring diagrams for the '82 on the Mirafiori site. You have to register to get them. If you have any trouble PM me, I also have the wiring diagram and could email it to you.

I'm not that familiar with what Legend did, but the stock FI is pretty straightforward.
A.J.

1974 Fiat 124 Spider
2006 Corvette
1981 Spider 2000 (sold 2013 - never should have sold that car)
housecall55
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Joined: Sat Oct 20, 2018 4:45 pm
Your car is a: 1982 124 Spider

Re: Converting back to non-turbo questions

Post by housecall55 »

Thanks.
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AndyVAS
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Your car is a: 1980 Fiat 124 Spider

Re: Converting back to non-turbo questions

Post by AndyVAS »

This is very straight forward. More for some than others but not at all complex. The ECU wasn't altered at all. Some of the converted cars had vacuum/boost activated switches. Those were wired into the EFI harness to alter the signals from the temp sensor and air flow meter. If you follow the harness and find scabbed on switches with hose fittings you'll know what to remove. Simply remove them and splice the harness back together. Green to green or blue to blue or some such. You may not find any switches or you may find as many as 4.
Andy Phillips
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rridge
Posts: 162
Joined: Thu Aug 10, 2006 11:59 am
Your car is a: 1981 Turbo Spider

Re: Converting back to non-turbo questions

Post by rridge »

The distributor has been modified to increase advance at low rpm and limit advance at high rpm. Replace the advance spring and limit clip with the two stock springs if you can find a vendor that still carries them. Then reset the static advance to the stock spec.

The exhaust manifold and turbo down pipe are restrictive. They should also be replaced with stock parts if you want full FI performance. Any of the cast turbo exhaust system parts in uncracked condition can be sold to Turbo owners as spares. Most crack eventually.

Extra heat from the turbo is hard on other components in the vicinity, especially the distributor and ignition module. Check the condition of the distributor pickup wires and operation of the vacuum advance. Renew the heat sink grease on the ignition module. Inspect the condition of the steering damper and the tie rod end under the exhaust.
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