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+--- Thread: Cm870 low boost (/showthread.php?tid=6384)
Cm870 low boost - Farmer379 - 07-11-2020
It is a 2005 peterbilt cm870 cpl 8519. Was changed to 8518 by previous owner. I just bought a bully dog ecm tuner and put the economy with power tune on and now only getting 25-30 psi boost. {up to 40 previously} I checked for codes and have 2. pid: 251 fmi real time clock
Sid: 103 fmi turbocharger speed #1
Also have not deleted anything
RE: Cm870 low boost - tree98 - 07-11-2020
Take the bully dog out and throw it away. If you want good tuning, it's available from top members on this site but not those garbage bully dog tuners. Who knows what that thing is tricking the ecm into thinking.
RE: Cm870 low boost - Rawze - 07-11-2020
(07-11-2020 )Farmer379 Wrote: ... I just bought a bully dog ecm tuner
...
send that thing back to them and demand your money back!. -- complete garbage!
RE: Cm870 low boost - JimT - 07-11-2020
(07-11-2020 )Farmer379 Wrote: It is a 2005 peterbilt cm870 cpl 8519. Was changed to 8518 by previous owner. I just bought a bully dog ecm tuner and put the economy with power tune on and now only getting 25-30 psi boost. {up to 40 previously} I checked for codes and have 2. pid: 251 fmi real time clock
Sid: 103 fmi turbocharger speed #1
Also have not deleted anything
Not sure what your question actually is. If you are complaining about low boost because of the bully then it's an obvious solution. Best thing to do is get rid of the bully, get an inline 5 or 6 and a laptop with insite 7. Get a hold of the proper ECM file and have it tuned properly. Gotta be careful with the 870's, something about quirks trying to flash new files(?). Anyway, get it tuned properly and disable that EGR. You'll probably find everything working perfectly again. Or you'll be able to diagnose any actual problems that might be hiding behind the currently bad programming.
RE: Cm870 low boost - Rawze - 07-11-2020
PM 'mommaburt' or 'Unilevers' here on the forum for CM870 programming... that or take it to Mr. hags or gearheads shop ... trust no one else!.
Might want to find out why bad programming is screamed about so boldly on here while your at it .. educate yourself...
http://rawze.com/forums/showthread.php?tid=1558&pid=13255#pid13255
and as far as the CM870 goes...
http://rawze.com/forums/showthread.php?tid=6154&pid=53580#pid53580