Newb Tuning lesson part 1 - SRT Forums

duster360 · 11-01-2009, 09:05 AM

Data logs are a wealth of knoweldge about what's going on with your car and tune, but all the info can sometimes be hard to decifer. From time to time, I'll be posting some logs from my extensive collection of "Forum problem Logs" to illistrate common issues.

This is the first post in a continuing series of Discussions on tuning, dataloging and using your DSP to diagnose basic mechanical/electrical issues.

Lets jump right in:

Discussion Questions for this series:

Whats wrong with the Log?

What wrong with the tune?

What wrong with the car?

Deposit Files

porksword · 11-01-2009, 09:36 AM

One thing I noticed was after he got on it and the car was accelerating the TPS sensor was still bouncing around instead of going wide open and holding. Also the timing was climbing pretty high even after the car started accelerating.

I would have liked to see at least a baro on the log as well.

Good thread.

mjennings2 · 11-01-2009, 09:36 AM

Quote: Originally Posted by duster360

Data logs are a wealth of knoweldge about what's going on with your car and tune, but all the info can sometimes be hard to decifer. From time to time, I'll be posting some logs from my extensive collection of "Forum problem Logs" to illistrate common issues.

This is the first post in a continuing series of Discussions on tuning, dataloging and using your DSP to diagnose basic mechanical/electrical issues.

Lets jump right in:

Discussion Questions for this series:

Whats wrong with the Log?

What wrong with the tune?

What wrong with the car?

Deposit Files

Ill start it off with some easy stuff.

Its missing quite a few pids to log.

All Map/Tip Pids
TRQ DESIRED
TURBO TOTAL TRQ DESIRED
TURBO WG DC
TURBO TRQ POTENTIAL STP
TURBO WG ADAPT DELTA
EXH TEMP
AMB TEMP

List of what to log here
What Parameters to Datalog

porksword · 11-01-2009, 05:38 PM

how long will it be before we here the answer?

mjennings2 · 11-01-2009, 06:56 PM

I guess he was expecting more involvment. Ill throw out there something with the tps wiring?

Kason23 · 11-01-2009, 07:18 PM

Well For one there is NO form of boost to be seen. We have NO idea how much boost he is running. Along with the BARO to see if the sensors are all correct. Which may be a reason for all the knock. Also seems the ACT is rising quite fast? Something is def wrong with the TPS also it drops on top of the pull.

mjennings2 · 11-01-2009, 07:50 PM

Ok, so missing pids, tps issue, act climbing fast, no clue on map, baro, sensors correct.

Any other ideas?

duster360 · 11-02-2009, 08:06 AM

The main theme of this lesson is PATIENCE.
Before jumping in and changing fuel% and timing (or suggesting someone should) you need a clear and concise understanding of the problem. The ONLY way to see whats going on with your car is to DATALOG, DATALOG, DATALOG!!!!!!!

Here's the note I got with this log from the car owner:

Quote:

was running rich so i added 7% fuel to 4-5k and 5-6k and that brought me to like 12.5 afr. Then i took -2 degrees from where i had a knock of 6 and it didn't help. So i was told to maybe add a bit more fuel and i bumped it to 10%, which gave me 12.0ish afr but i still have a knock of 6 between 5-6k

If the only info I had was this discription, I'd only be seeing 10% of the issue. Remmember that when a member post something similiar without a log.

Overall GOOD JOB,,,,Well done

You guys are correct.

Whats wrong with the Log?
Missing MAP, BARO are the big ones.

What wrong with the tune?
Probably nothing! Until the TPS is fixed its too hard to tell.

What wrong with the car?
The TPS/wiring is jacked up causing Openloop F/A(commanded A/F) to lean and also add timing. Its the TPS thats causing the knock and LEAN A/F. If the boost was under PCM control the boost would immediately lower once the TPS signal was below ~2.8v

Note: ACT is typical of stock IC/turbo

Kason23 · 11-02-2009, 09:19 AM

I thought about it being on a stock intercooler after I posted lol. I enjoy these duster def keep it up.

mjennings2 · 11-02-2009, 10:17 AM

Def keep em coming. Fun and informing.

Aimois · 11-04-2009, 04:48 PM

Here is the newest log...i believe i added what was missing and i made the log a bit longer.

Deposit Files

Aimois · 11-04-2009, 04:53 PM

And if there is something wrong with my TPS...what are somethings i can do to fix it? I have absolutely no idea...never had to even mess with one before. (sorry im a newb) =P

Aimois · 11-04-2009, 05:09 PM

nevermind, im a dumby lol...ima go get a rewire kit and see if that fixes the problem