tool question!
 

Alright. im new to the whole digital tuning idea, so plz forgive me. i have an 88 s4 with an na 13b. and i want to start messing with engine ecu and ignition, air fuel mix, ect. what tool is required and were could i get one. (really hoping its not the $1400 snap on tool!) if anyone can point me in the right direction i would be truly grateful. thanks every one.

First you would need to fit an ECU which can be tuned.

The stock ECU is ancient, and it is closed. Tuning it require reprogramming the ROM and there aren't very many people with experience in that. Considering that there have never been any "chip" upgrades for the thing, with the only programmable version of the ECU being the RTek, the demand is low and it is a major pain.

The RTek is your cheapest option. However it requires an old Palm Pilot to program.

Next step up is a full standalone EMS. The price starts at around $300 (MegaSquirt 1 kit) and goes up from there with popular options being the Haltech line ($800 and up), Microtech (terrible ECUs, $800 and up) and MegaSquirt (MS1, MS2, MS3, MS3-Pro).

Most standalones require a complete rewire of the engine though there are pre-built harnesses available for Haltech and MegaSquirt.

The more popular entry-level standalone EMS units right now are the Haltech Platinum Sprint RE (basic unit suitable for all types of driving), Microtech LT9C (more suitable for drag racing than other types of driving), and the various MegaSquirt kits (more suitable for those with a solid background in electronics).
Here are some links:
http://www.lms-efi.com/sunshop/index...oduct_list&c=2
Microtech EFI
MegaSquirt | Engine Management System | Electronic Fuel Injection - DIYAutoTune.com

We also have EMS subforums for the above listed products, as well as other brands.
Engine Management Forum - RX7Club.com

ok that is acualy quite easy given what i do for a living. ill look at the links butis there anything that is required with these set ups? ie like the wireing harness, ect... thanks again every one!

Yes, I would highly recommend using a brand new aftermarket flying lead harness with brand new sensors. The original wiring and sensors are just too old and too expensive to bother with. However, don't remove anything until you can confirm that it is not necessary.

Talk with the vendors to see if you would want anything else, such as a different MAP sensor, TPS sensor, fuel injectors, etc. Also, if your budget allows, you may want to start off with a more robust EMS as opposed to an entry-level model. The details will depend on what you intend to do with your car.

Here's my MegaSquirt writeup:

How To Megasquirt Your 2nd Gen RX-7

In general this gives a decent overview of the standalone install process.

buy a megasquirt ecu. take your car to a shop and tell.them to tune it. not really worth it on a basicly stock motor

thanks guys!