i have a stock s4 NA. ill be replacing the flywheel, closing down the final drive, and getting the racing beat true duals. just some simple upgrades to make it more fun. now, if i can properly tune the a/f ratio such as this guy did, https://www.rx7club.com/rtek-forum-168/thumbs-up-s5-na-2-0-a-668832/, do you think it will be worth the money for the RTEK? im assuming with the full rb exhaust it'll be better than the headers alone. or is that that level of tuning won't benefit too much from finer fuel mapping?

 

after heading to the RTEK site, i've learned they don't have a ready-made s4 NA wideband tuner. i guess i should generalize my question then. is any wideband tuner available that is made to tune NA s4's and will that system benefit my car noticeably?

 

What exactly is a "wideband tuner"?

We have the Rtek7 Stage 2 for S4NA.
http://www.digitaltuning.com/?pid=rt...age=2&ecu=S4NA

This allows you to adjust fuel (as well as a bunch of other stuff).

It's highly recommended you have a wideband so you can collect the AFR information you need to properly make adjustments on the Rtek. I'm not aware of any engine management system that comes with a wideband included.

 

well i guess wideband tuner is a tuning device that relies on a wideband sensor?

 

i have an 86. i guess im screwed then, right?

 

i think you're talking about a wideband controller (not tuner)...that connects to a wideband sensor and gathers afr data that is then output to some sort of device for viewing (usually a gauge of some sort). You then need a management system (such as the Rtek 2.0) to "tune" the car. It is what lets you change the fuel/timing maps...the wideband just provides data for you to work off of.

Oh, and an 86 is an S4, so the rtek should work for your car I would imagine.

 

Yeah, what he said.

 

I've got an Rtek 2.0 and mine's an 86. The ECU's are the same as any other S4, it's other stuff that was different (like 5th gear, some interior trim, etc.)