Need help interputing datalog file
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Need help interputing datalog file
Is there someone who is good at diagnosing these datamaster files. I would need to e-mail if willing.
I have a 92 LT-1 383c.i. PCMforless chip done couple years ago. I have a stumble around 40-50 mph in O.D. with little throttle input i.e. trying to put a load on motor. runs fine everywhere else but my advanced timing shoots to 46 in one spot for no reason and my knock count goes crazy in another spot at 34 deg. total timing for no apparent reason all under wide open throttle pull. I have an adjustable fuel pressure gauge I can play with if needed. Thanks.
P.S> I have been following Irishpete86 post because I have always had the same issue with laptop cutting out loosing connection every 5-7 seconds for about a second then back on?
I have a 92 LT-1 383c.i. PCMforless chip done couple years ago. I have a stumble around 40-50 mph in O.D. with little throttle input i.e. trying to put a load on motor. runs fine everywhere else but my advanced timing shoots to 46 in one spot for no reason and my knock count goes crazy in another spot at 34 deg. total timing for no apparent reason all under wide open throttle pull. I have an adjustable fuel pressure gauge I can play with if needed. Thanks.
P.S> I have been following Irishpete86 post because I have always had the same issue with laptop cutting out loosing connection every 5-7 seconds for about a second then back on?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I recommend importing the file into Excel and graphing various parameters of interest.
For example, this graph of IAC counts shows startup idle decay and throttle follower mode. It also shows the IAC maxing out at 145 (parameter set in the programming):
For example, this graph of IAC counts shows startup idle decay and throttle follower mode. It also shows the IAC maxing out at 145 (parameter set in the programming):
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Does it graph like that automatically when converted and how do you know what to even look for i.e. my data log file at least goes red when out of the parameter. My wife handles most anything above basic com skills 
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
In Excel you highlight the column and choose Insert/Chart...
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Open Datamaster and chose playback Datamaster file. Next, click view and click histogram. Then click start. As the file runs it is populating the Histogram with BLM averages. You may need to smooth the VE tables out using these averages. Feel free to send it to me for my observation. scottncherylhansen@sbcglobal.net
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Wanted to thank Scott for helping me dial in my LT-1's tune. Awesome customer service and works with you till it's right. Not a one and done shop out for your money. Check out his website if in need 
