ph1 172 - Rstuner advice

[mortster]

Ok so i'm waiting for an rstuner kit for my mk1 172 (CB0M)
Pretty happy on how to use the kit, but one thing i'm not sure on is this:

For the mk1 172 engine (CB0M) henk lists a number of ecu files:

complete (.rst) files
A300_3504.rst - the standard complete ECU (224Kb)
A300_35FF.rst - the group(e) N ECU file (224Kb)

partial (.cal) files
A300_35FF.cal - feb 2008 RON98 (32Kb)

I expect that when I do a read on my ECU it will be software version A300, if not then it might be Axxx but I will do a backup of the original .rst and .cal before I proceed.

Right, here is what i'm confused by, let's say that my existing ECU is at version A300, would I just write the A300-35FF.cal (feb 2008 RON98) as I am already on software version A300, or would I need to write the complete A300_35FF.rst (group(e) N) file first ? What is the difference between doing it these different ways ? Surely the group N complete file is still version A300 so how can it be any different than then standard ecu file ?

Hope someone out there understands what I am getting at

 

[mortster]

Ok let me try this theory out...

If i find with a read ecu that I am currently on A300 standard, then if I just apply the ron98 cal (a300-35ff.cal) I will get a remap, but will not benefit from any of the extra features that the full group n rst would provide (such as the 7.8k limiter unlock and raised 1.5k idle) ? Am i right in that thinking ?

 

[Fastchip]

Chances are the software on your car is already A300. If so , apply the latest .cal and enjoy.

 

[mortster]

Thanks Henk,

Am I right in thinking that if I do just apply the latest RON98 cal onto the existing standard A300 that the limiter and idle will still be standard, or will the cal file also control the 7.8k limit and the idle without having to apply the complete group N .rst file ?

Also I notice you have, kindly, uploaded some newer RON98 files for the A300 version, it says something about having the latest firmware for the rstuner, will the rstuner that I purchased yesterday be ok for these latest RON98 cal files ?

Cheers,

Si.