Painless Harness vs Speartech
Check out this thread which has a few pics of my harness https://ls1tech.com/forums/conversions-swaps/555491-got-my-speartech-harness.html
my $.02
Pat
Jim
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I got the Painless one first, having traded it for parts. the LS1 engine I have for that car did not include a harness, so a complete, new in the box deal sounded good to me.
Whereas my Trans Am engine had the factory harness, so I opted for Speartech to modify it and make it stand alone. It seemed to be more economical while achieving the same result.
The above posts are pretty spot on. John has been super friendly and helpful in answering questions, even after I made my purchase. Everything was labeled so it probably as easy as it will ever get for installing.
Same for the painless harness. Everything is labeled, the instruction book is clear and easy to understand. It includes part numbers, etc, too.
The differences I've noted are the following:
1- Painless requires the use of a '98 computer, so it makes it a little harder to track down specifically. And you may still need it reprogrammed
2- The Painless set up has a vats bypass module. the speartech doesn't. one more part under the hood and to be wired up, etc....
3- the Painless wiring seems to have longer wires- allowing you a little more freedom to locate the PCM where you want, etc. Not that this is any fault of Speartech, as it's the factory harness. It just works out this way.
4- Speartech included the fuel pump relay. I have to go buy one for my Painless wiring.
otherwise it's pretty similiar. I don't think you'll go wrong with either one.
I hope this is helpful.
The Best V8 Stories One Small Block at Time
Chuck







