If you change a major part on your engine, you better check your tune!!!
11-21-2010, 09:54 AM
#1
Le Mans Master
Thread Starter
If you change a major part on your engine, you better check your tune!!!
As most here know I have been having Mick Stevens (mseven) doing my tune on my new 383 for the last few months. Things have been going great, every new chip I would get improving the performance noticable. About 2 weeks ago I had to replace the MAF sensor with a rebuilt unit, then a few days ago I did another datalog and sent it to Mick so he could burn me a new chip..Yesterday morning I get a call from Mick saying the datalog I sent him showed my car running very,very, lean and I shouldn't drive it until this problem was corrected..Come to find out replacing the MAF sensor with a different (rebuilt) unit changed my blm from 128,(which is perfect), all the way up to 145 to 148 which is very lean . Thank goodness Mick saw this and let me know quickly or I could have done serious damage to my engine..This post is just to let you guys know that changing a major part on your engine may also change your tune enough to do damage to it. Im just glad that Mick was there watching my back.. My suggestion is anytime you change a major part on your engine, do a scan to make sure you haven't changed your tune to the point that it could do damage..Thanks Mick, good job....
...Wayne.
...Wayne.
Last edited by WW7; 11-21-2010 at 11:18 AM.
11-21-2010, 10:21 AM
#3
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
"Its fine", "Runs fine so..."No you dont know til ya log youd be surprised.
Good to hear the problem was caught!
11-21-2010, 10:39 AM
#4
Le Mans Master
no problem Wayne.
Typically going that lean from a known good blm/fueling would indicate vac leaks or possible fuel delivery issues. Because I had him check for the latter, I think in Waynes case the aftermarket maf is calibrated differently. I have tuned others cars who had to replace the MAF (with a gm version), but I would only see a couple of point deviation and nothing of any huge significance. Bottom line in this case is that it's going to lean/edgy for my taste, and I don't want to see anyones motor get hurt.
And for those who don't look at data with modded cars...well it's anyones guess as to what maybe truly going on.
Typically going that lean from a known good blm/fueling would indicate vac leaks or possible fuel delivery issues. Because I had him check for the latter, I think in Waynes case the aftermarket maf is calibrated differently. I have tuned others cars who had to replace the MAF (with a gm version), but I would only see a couple of point deviation and nothing of any huge significance. Bottom line in this case is that it's going to lean/edgy for my taste, and I don't want to see anyones motor get hurt.
And for those who don't look at data with modded cars...well it's anyones guess as to what maybe truly going on.
