2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Anyone Who Has Done A J Specswap

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Old Jun 9, 2002 | 06:54 PM
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From: My car
Anyone Who Has Done A J Specswap

I HAVE A 87 T2 AND I AM TRYING TO PUT IN A 91 JSPEC .
i VE RIPE OUT ALL EMISSION AND SOME SENSORS . IVE MANAGED TO GET IT STARTED IT RAN IT FOR A WHILE IT RAN FINE BUT WHEN i GOT ON IT, I WOULD DIE OUT . I THEN REALIZE I LEFT THE HIGH IMP INJECTORS . I THEN PUT IN LOW IMP INJECTORS NOW I AM NOT GETTING GAS IN THE FRONT ROTORS AND IT RUNS LIKE **** . I AM SENDING MY INJECTORS TO GET CLEANED ON TUES. I GUESS MY ? IS WHAT SENSORS DO I NEED TO KEEP TO MAKE IT RUN RIGHT . i AM ALSO RUNNING MY 87 T2 ECU AND HARNESS
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Old Jun 9, 2002 | 07:43 PM
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what are you doing about the OMP??? did you swap your front cover to retain the S4 OMP or???
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Old Jun 9, 2002 | 07:45 PM
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And turn your "caps lock" off and use the "Enter" button at the end of each paragraph.

That will make it much easier to read what you wrote.
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Old Jun 10, 2002 | 10:34 AM
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Sorry my daughther beat the **** out of my keyboard Any how yes I CHANGED the front cover .
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Old Jun 10, 2002 | 11:14 AM
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From: Rohnert Park CA
using a series 5 motor in a series 4 car, you just swap over any sensors (and the front cover) that the old series 4 motor had. So once you get your injectors cleaned, and timing set it sounds like you should be fine.
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Old Jun 10, 2002 | 12:20 PM
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There's a little more to it than that. You have to get the new S5 ECU and wiring harness. I heard its pretty tough to rewire an S4 for an S5 engine. Plus you CANNOT use the S4 sensors on an S5 engine or on the S5 ECU. You WILL need ALL the S5 sensors, wires and ECU. S4 and S5 are not compatible
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Old Jun 10, 2002 | 12:25 PM
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From: Rohnert Park CA
Originally posted by turboGXL
There's a little more to it than that. You have to get the new S5 ECU and wiring harness. I heard its pretty tough to rewire an S4 for an S5 engine. Plus you CANNOT use the S4 sensors on an S5 engine or on the S5 ECU. You WILL need ALL the S5 sensors, wires and ECU. S4 and S5 are not compatible

If he has swapped over all the external parts (which it sounds like he has done) there is no need to use the S5 ECU.

if there is no need to use the S5 ECU there is no need to use the S5 sensors.

he is not trying to make a NA car into a T2... he is just trying to get a S5 13BT block to work in a S4 with the S4 13BT stuff.

Last edited by Icemark; Jun 10, 2002 at 12:30 PM.
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Old Jun 10, 2002 | 01:21 PM
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Originally posted by turboGXL
There's a little more to it than that. You have to get the new S5 ECU and wiring harness. I heard its pretty tough to rewire an S4 for an S5 engine. Plus you CANNOT use the S4 sensors on an S5 engine or on the S5 ECU. You WILL need ALL the S5 sensors, wires and ECU. S4 and S5 are not compatible
Kinda sorta.

S4 sensors will not work on an S5 harness (connectors are different in most cases)

However, there's nothing to stop you from using S4 sensors in the S5 block, with the S4 harness and ECU.

That's precisely my setup on the FC.

PaulC
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Old Jun 10, 2002 | 03:00 PM
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Sorry, I must have misread. i thought he was going to be using the S5 externals also. Block for block u should be fine minus the omp.
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