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Best Tuning Options for 2g GSX?

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RenleyX

Proven Member
97
1
Jun 3, 2014
Denver, Colorado
There are a few other threads on tuning a 2g but they are really old, like 4 to 6 years old :p

So, where are we at today?

I have a 2g GSX and I want to be able to tune the car

Is the best option still the dsm/ecmlink?

Would a evo ecu be better/worth it?

Other??

The car has a fully built engine with currently the stock turbo ( I am still looking for which aftermarket turbo to get me to 450hp)

What are your suggestions?


Thanks!
 
Yeah you're absolutely right. All tuning that we do to the ecu is still based off the data the ecu gathers from its sensors, which are still very much limited.
Regarding your example, I think at that point with the extra data we see, we become the ecu since our ecu can't use this extra data but we can. Honestly though our input to try to compensate for whatever changes we see is still limited to the interval interpolation. So I think you're asking the wrong question because your point is right. The question we should be asking is what is absolute maximum sampling rate the ecu can actually utilize. This I do not know but I'm sure everyone will agree a higher sampling rate is always better.

True, very true. I just wonder at what fidelity and sample rate does it really no longer matter because the sensors themselves cannot react fast enough, or you just can't plot a target value on a curve because the interpolation would bring it down or up and render your desired change moot.
When we look at what's out there and what has been done with the tools given, we have 800+hp engines out there running ECMlink on the "slow" 2G ecu.. maybe even big numbers on a 1g ECU, though I can't provide anything specific at this moment. To that end, speed-wise, the lower ECUs seem to provide enough power to get the job done and in an accurate manner.

I think what it really comes down to is what ECU has a tuning solution the user feels comfortable with, and what does the ECU provide in terms of extra features (such as more inputs for more sensors). I think processing speed should be taken completely out of the question regarding comparison.

UNLESS more inputs and the feature utilizing that input needs more processing power, then we can settle on the fact that the faster ECU will be able to utilize that feature whereas a slower one would otherwise not be able to because it couldn't keep up and it would put other critical processing tasks at risk for time critical operations.
 
True, very true. I just wonder at what fidelity and sample rate does it really no longer matter because the sensors themselves cannot react fast enough, or you just can't plot a target value on a curve because the interpolation would bring it down or up and render your desired change moot.
When we look at what's out there and what has been done with the tools given, we have 800+hp engines out there running ECMlink on the "slow" 2G ecu.. maybe even big numbers on a 1g ECU, though I can't provide anything specific at this moment. To that end, speed-wise, the lower ECUs seem to provide enough power to get the job done and in an accurate manner.

I really wish I knew and I bet some tuners on this forum know but are reluctant to tell us or at least have an idea at what point our Ecus truly become obsolete. This is why I've been so attracted to the Ostrich 2.0 tuning option because it is pure code! Everything can be quantified and manipulated on the Ecu.
As for our sensors, even if they were upgraded with faster cycling rates, could our Ecus even use this data to better manage combustion? Seems like there's always more questions than answers. We need a Mitsu ecu engineer in here damnit!
 
I've been running an evo 8 ecu in my 2g for probably 5 years now, and it has been a great experience for me. Although I've never run ecmlink, I've heard from others that there are still some nice things you can do in ecuflash on an evo 8 ecu that you can't do with ecmlink. A few examples include full control over radiator fan duty %, and the ability to easily add a knock - triggered intercooler sprayer. There used to be other things that ecuflash offered over ecmlink, like alt maps and ecu-managed boost control, but I think ecmlink has many of those things now. Support for evoscan is huge - as long as you are looking on the evo forums and not the dsm forums.

However, logging on ecmlink is far superior than logging with the evoscan evo 8 equivalent.

OP, if you're willing to learn, I don't think you'd be disappointed with either setup.
 
Last edited:
I asked basically the same question to Tom at ECMtuning and this is the answer I got:
Thomas Dorris said:
I'm sure the black box (98/99 DSM and EVO8/9) ECUs have a faster processor, but they also have more code. Still, I suspect those ECUs run all that code faster anyway because Mitsu added a *delay* on the main loop to slow it down to what they designed the code for.

All the critical stuff that needs to happen in sync with real time events (like firing spark or injectors relative to piston position) happens inside an interrupt, which is triggered by hardware...meaning the speed of the processor has little relevance for that stuff. The processor speed would only come into play on the frequency of table look ups and such that happen in the main loop. But, really, once the engine speed gets high enough that the main loop might feel starved for processing speed, things really aren't changing very quickly anyway.

All that said, I have no doubt that a black box ECU runs more code in shorter time than a DSM ECU. I'm just not sure you'd ever notice a difference except in the functionality you're able to pull off with the faster processor. For example, the black box ECUs have enough spare processing power to dynamically look up custom table indices so you can do things like change the RPM and load indices in the timing & open loop maps.

Thomas Dorris
 
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