# red top with black top!

**URL:** <https://forums.speedlife.net/t/red-top-with-black-top/101453>\
**Category:** SON240sx Automotive\
**Created:** [November 5, 2006, 8:37pm UTC](https://forums.speedlife.net/t/red-top-with-black-top/101453 "2006-11-05T20:37:06Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\
**Post date:** [November 5, 2006, 8:37pm UTC](https://forums.speedlife.net/t/red-top-with-black-top/101453/1 "2006-11-05T20:37:06Z")

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Can i use the the wiring for red top on a black top!?  
I have a red top but i wanna upgrade to black top without change the wiring, is it possible?!  
Thanks

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**Author:** ![seth](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/seth/32/3175_2.png) [@seth](https://forums.speedlife.net/u/seth)\
**Post date:** [November 6, 2006, 5:24am UTC](https://forums.speedlife.net/t/red-top-with-black-top/101453/2 "2006-11-06T05:24:27Z")

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are the ecu codes the same for the two motors? if the ecu codes are different then the ecu plug is going to be slightly different in the pin out.

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**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\
**Post date:** [November 6, 2006, 7:39am UTC](https://forums.speedlife.net/t/red-top-with-black-top/101453/3 "2006-11-06T07:39:05Z")

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I’m pretty sure even early model blacktops have different throttle body plugs…

you may need to just use your redtop intake/TB on your blacktop… \<- a guess

and redtop (skinny one) O2 for redtop ECU…

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**Author:** ![DTS](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@DTS](https://forums.speedlife.net/u/DTS)\
**Post date:** [November 6, 2006, 7:48am UTC](https://forums.speedlife.net/t/red-top-with-black-top/101453/4 "2006-11-06T07:48:45Z")

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the only difference between redtop and blacktop harnesses are the throttle position sensor if you have an automatic redtop, they use 5 wire.

and on type x blacktop harnesses the pins on the ecu are different.

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<div class="post-metadata">

**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\
**Post date:** [November 6, 2006, 11:05am UTC](https://forums.speedlife.net/t/red-top-with-black-top/101453/5 "2006-11-06T11:05:05Z")

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> [@DTS](#):
>
> the only difference between redtop and blacktop harnesses are the throttle position sensor if you have an automatic redtop, they use 5 wire.
> 
> and on type x blacktop harnesses the pins on the ecu are different.

as well as the O2 sensors, not the harness but the signal they send

> **[sr20det uses alot of gas...can it be the o2 sensor? - Nissan Forum | Nissan...](https://forums.nicoclub.com/sr20det-uses-alot-of-gas-can-it-be-the-o2-sensor-t157509.html)**

> **[ECU's & Harnesses Differs With 02 Sensor...](https://www.sr20forum.com/threads/ecus-harnesses-differs-with-02-sensor-wiring-running-rich-explained.124479/)**