ShapeGSX

You can't datalog knock via OBDII. You can datalog timing, though, which is almost as good.

mayhem

iTrader: (9)

Great info guys!

CornerHard

Nope, you can't log knock w/ OBDII. Also, the data rate sucks, especially if you're logging multiple variables (as mentioned above).

Even though 2nd gen DSMs are also OBDII, we have a tool called DSMLink (www.dsmlink.com) which changes the way the stock ECU communicates, so that you can log knock and everything else the ECU sees at a high rate of speed. You can also alter timing advance, fuel trims, redline, fuel cut, and much more, which is superior to an S-AFC. The catch is that all this magic is possible only with the 95 ECU, which has an EPROM slot on the circuit board, so you can take out the existing ECU programming chip and replace it with the new.

If you're lucky, someone will figure out a way to do this on the Evo (maybe the Evo 8 has an EPROM, since it's the first in America?). Otherwise, the best option for heavy-duty datalogging is getting a standalone like the AEM EMS. For now getting an S-AFC and OBDII logger is probably your best budget logging/tuning combination, even with its limitations.

mayhem

iTrader: (9)

That's what I figured. Getting EVERYTHING you need to log is only around $300 if you go with a cheapo PDA. Not bad considering the kind of use you could get out of it.

I had heard before about the OBDII connection being able to send only so many frames per seconds of data. So the more sensors you're logging the less accurate it becomes. The timing is what's going to be the most important to me. When logging the timing is it crossed referenced with engine speed to complete the X & Y axis?

AutoXer

iTrader: (1)

I'm not really sure what your asking here. They can be logged simaltaniously(sp), if thats what your asking. I can send you a CSV file when I get home.

AutoXer

iTrader: (1)

Here are a few logs of my Evo 8. Import them into a spreadsheet program and graph them.

Just look at that funky timing....

AutoXer

iTrader: (1)

You can download the windows software for free to examine the logs. www.autotap.com

I've attached a few AutoTap format logs.

silverEVO8

iTrader: (12)

I just ordered a Pocket Logger from http://pocketlogger.com
Looks like it will work for me just fine. It logs to a Palm pilot like my IBM C3 (good for nothing else ). I'm going to start logging data to make sure my SAFC2 is a tool for good and not for evil

992gnt

iTrader: (5)

I'm using the Pocketlogger, with good results. I wouldn't go to the track without it. Between that and the e-manage support tool software, I'm pretty well covered for tuning. The only other thing I would want is a wide band.

QuantumEVO

iTrader: (12)

I think rpm vs. MAP vs. ign is going to be the most useful for datalogging. MAP is more important than MAF with respect to how it times the spark.

Mark
www.Quantum-Racing.com

AutoXer

iTrader: (1)

I don't have MAP as a variable with my AutoTap. Do you guys have it on your pocketloggers?

silverEVO8

iTrader: (12)

I got my Pocket Logger today... Can you tell me where to find the OBDII plug? I'd appreciate it.

Thanks

AutoXer

iTrader: (1)

Its just under the dash above your right shin. You can reach it fron the drivers seat. It faces down.

Good luck, tell us how it goes.

silverEVO8

iTrader: (12)

Thanks, I'll see if I can get the thing going ASAP.....

boostedwrx

iTrader: (27)

Yea listen to Shape he knows whats up (again, as always)

You can only datalog knock with obd I. With obdII you can log timing advance which is just as important. I only log RPM and Timing Advance with my PocketLogger.

This damn logger has stayed with me forever. Ive cleared various CEL of friends, datalogged several tuner cars, and its been useful to me with my old Eclipse and my 660's/SAFC!!

****ty thing is, I can only get 8 or 9 samples a second even when doing the byte timing and what not...