Recently purchased p28 ecu with s300 but did not purchase ecu harness. Can anyone shed some light as to why I find $20 harness adapters up to $200 adapters. I would like to purchase a quality unit that works but don't want to over pay.

 

It's in the quality for the most part. I have a Yonaka one. The connector shells on it were garbage and began to wear out after a few connect/disconnect cycles... I started having an issue with MAP and TPS voltage offsets. Went to the junkyard, clipped a harness, and swapped the shells over to the Yonaka and I've been good to go since then.

 

DEFINITELY get what you pay for. The ebay harness connectors are garbage, and their solders are seriously unreliable. If you get a weak connection or lose a wire during a pull, it can destroy your engine.
Side note, for any jumper, I would recommend hot gluing the hell out of the female connector's outgoing wire stubs so they don't shake loose over time.

 

Thanks for the help. Just bought a xenocron unit. Works fine. I see what you mean about hot glue. The pins look to be interference fit, not clipped in. I think i got a long road ahead of myself in the world of hondata tuning. There are too many buttons and no glossary for terms.

 

If you buy it off ebay for $20 its going to be garbage with Chinese knock-off plastic connectors.

The good harnesses:

Boomslang
Rywire
HA Motorsports

There's probably a few other but can't think of them right now.

 

Either you don't have Hondata or you didn't even click on the "Help File". Not only is it available in SManager itself, but off of the website as well. They probably have one of the more comprehensive help sections although it can be vague at times due to implied knowledge.

 

I brushed over the help file and the technical page on the website. I have been lurking other threads in hopes to find a "hondata for dummies". I just feel lost when i have so many sensors to watch and parameters to adjust. It would be great to have a step by step instructions on basic smanager. I feel once the ball gets rolling, everything will be down hill from there. Untill then, i will continue to research as much as i can. Thanks to honda-tech.

 

Read VegasInvasion's CROME manual in his signature in post #3. Yes it's from CROME, but it's definitely a good starting point to reference when it comes to tuning.

You can also download AEM's user manual for their EMS. Be for warned though, it his huge and very detailed on their system and how to tune. Many great principles in there as well.

There is no real step by step, tuning is accompanied by a HUGE learning curve that most can't overcome. If you can successfully, then congratulations, you are the minority. Keep reading the Help File until you become more familiar with the system. Just as very general basic advice, you won't need to get very involved in the beginning with all of the offset parameters anyways so don't overwhelm yourself off the bat.