This is a question for all the experienced tuners out there. In order to make best use of the dataloggers (I've got the pocketlogger) and the SAFC2, I'd like to know what the ideal values are that we need to achieve by tweaking the SAFC2.

There is some good info out there for tuning DSMs 1G & 2G cars. The problem is that these cars require different trim values to achieve proper tune. I think the 1G cars are best tuned to obtain 100% trim while the 2G cars are best tuned to obtain 0.0% trims. What about the EVO? what should we be aiming for? Can some of the more knowledgeable tuners shed some light on this? What are we supposed to look for in the datalogs? Also, when we gather this data, how are we to best adjust the SAFC (or equivalent) to approximate the best values?

Thanks in advance....

 

Pocket logger is a super handy tool - but the wrong one for your job at hand

You need a wideband o2 sensor to do the job properly and we shoot for a/f's at 10.9 to 11.0 all the way across the power band with a dip a bit richer - 10.4 - 10.6 at 5000 - these values are for stock cars.. You can go much leaner but we see nominal power gains from going leaner and then more engine knock.

 

This would be a good question to put in Buschur's performance forum on this site. Besides the VPC, which is discontinues anyhow, it seems to be his weapon of choice.

 

I know its not as accurate but couldn't you tune it of the stock O2 sensor voltage, knock count and EGT's?

 

That's my question too. I went ahead and purchased a Pocketlogger and I've got my gauges ready to go in. The reason I did this is because several people in various forums advocate the use of these things to fine tune the various AFCs.
Of course, I understand that ideally one should have a wide band O2 sensor and preferably a dyno in order to tune a car efficiently and accurately. However, one would guess that tuning can be achieved with these other options. The problem is that I cannot find EVO specific instructions....
BTW, here is a very interesting link for DSM tuners: http://users.wpi.edu/~ktarry/tuning.html

 

We include the wiring instructions for the EVO8, very specific and easy to follow. We also include all the tuning instructions and settings with the AFC also. All you have to do to get the specific instructions for it is purchase the AFC from us. We took a considerable amount of time to get all of this perfect and used a portable wide band on the street on pump gas to get them.

David Buschur
www.buschurracing.com

 

I know that the various vendors provide settings along with the AFCs when they sell them. I purchased mine from AMS and I got some settings they provided. This is all fine and good, but I'm interested in gaining some knowledge in tuning so I can perform some adjustments myself.

I know that the various tuners use wide band O2 sensors and other tools as well. I also hear and read about people using dataloggers and EGT gauges (and boost gauges) to tune their cars. I want to gain the knowledge to apply the tools I have (pocketlogger and gauges) to the task at hand.

The information I'd like to see shared is not any particular set of settings, but rather some EVO specific data such as waht the values should be for the O2 sensor banks (the 2 in the EVO), What the ideal trim values might be fir the O2 sensors as well as the fuel trims....
Also, how to collect data. Should it be done while idling? when the car is stationary by varying RPMs? Otherwise, I'd guess the loads on the car need to be considered and the data analized based on some values... These values are what I'm looking for.

Maybe the tuning of cars is some kind of "black art", or just closely held knowledge that is not shared..... Maybe somebody out there could sell or otherwise make available the info needed for people who are interested in tuning their cars but don't have this necessary information.....

 

Its not some black art at all. Its actually pretty simple the device that your using is very simple but it produces (as youve probably seen ) desired or undesired effects on the ignition timing which starts a feedback loop of its own. So if you are to use a simple (but powerful) devise on these cars then you must even be extra versed in its effects on other parameters. so this is much harder to think in these abstract tuning terms when you have only 1 control measure. BTW You must tune the car under various load conditions not just reving it in the driveway

 

Thanks for the input, but this is something that I already know

Tha's exactly what I'm talking about. To be well versed on any subject requires study. What I want to know is where to find the text books that I can study from.... By the term "black art", I mean to say that it's some sort of closely guarded secret.... I don't need platitudes or general sort of statements. What would be useful would be something like:

1. Hook up the pocketlogger, specify thus and such parameters to log and run a test under these conditions: (fill in the blank)

2. Look at these numbers: (fill in the blank).... They should be like this: (fill in the blank). These numbers represent (fill in the blank) in these units of measure (fill in the blank).

3. To achieve the desired effects, manipulate the following numbers in your AFC (fill in the blank).

Perform these tests and adjustments at the following rpms: (fill in the blank) under the following conditions (fill in the blank).

Be aware of this: (fill in the blank), Do not adjust to these values: (fill in the blank).

And so on.... Of course, this is ideal world situation, I would settle for some baseline numbers of what to look for as far as O2 voltages, fuel trim numbers and whatever else is important and I've not mentioned, plus some general advise in how to dajust the AFC to obtain the desired values.....

 

Wow, I sure thought that this would be a good solid thread.... The real meat of tuning a car is in the interpreting engine data and adjusting fuel/timing maps. I guess nobody is interested in getting the knowledge to do this
IMHO, I much rather find out more on this subject than to discuss ad-nauseaum the pros & cons of one brand of exhaust vs. another.... Anybody out there care to help out??