Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - 89 6.2 Diesel is geared to smoke point, need smoke detector :)

rmay635703 · 08-14-2012, 07:14 PM

My truck being pollution controlled (C-code) and being a NON-turbo diesel was tuned from the factory (with a regular transmission and RPMs) to never smoke significantly. This meant loosing about 20% of the max power but also better FE and much better emissions.

However because I have opened the intake and now can take off at much lower than normal RPMs the IP does not quite compensate correctly and allows it to smoke which a non-turbo diesel should not do if you want the best MPGs.
The manual IP is capable of keeping proper tune over the entire operating range but near the extremes it is not very accurate which is why now that I can drive in the extremes it lets a little smoke out when it shouldn't.

Also as a driver my throttle is sloppy and chunky (hard to control) The throttle was always that way but after the transplant has become much more so. This makes it hard for me to add a small amount of throttle without racing, not sure how to fix this.

In my case I need an aide so I can learn how to drive the truck all over again so I keep it burning clean and efficient. I am tempted to alter the IP pressure but then my top end will suffer significantly (I can't make it smoke above 1500rpms) so it is a matter of me becoming aware of what the truck can and can't do efficiently, my best solution is to downshift but the trouble is that the motor is very efficient (surprizingly so over a large RPM band) but only right near the point that it smokes which is hard to find.

Cheers
Ryan

08-14-2012, 07:14 PM	#3 (permalink)
rmay635703 home of the odd vehicles Join Date: Jun 2008 Location: Somewhere in WI Posts: 3,891 Silver - '10 Chevy Cobalt XFE Thanks: 506 Thanked 867 Times in 654 Posts	My truck being pollution controlled (C-code) and being a NON-turbo diesel was tuned from the factory (with a regular transmission and RPMs) to never smoke significantly. This meant loosing about 20% of the max power but also better FE and much better emissions. However because I have opened the intake and now can take off at much lower than normal RPMs the IP does not quite compensate correctly and allows it to smoke which a non-turbo diesel should not do if you want the best MPGs. The manual IP is capable of keeping proper tune over the entire operating range but near the extremes it is not very accurate which is why now that I can drive in the extremes it lets a little smoke out when it shouldn't. Also as a driver my throttle is sloppy and chunky (hard to control) The throttle was always that way but after the transplant has become much more so. This makes it hard for me to add a small amount of throttle without racing, not sure how to fix this. In my case I need an aide so I can learn how to drive the truck all over again so I keep it burning clean and efficient. I am tempted to alter the IP pressure but then my top end will suffer significantly (I can't make it smoke above 1500rpms) so it is a matter of me becoming aware of what the truck can and can't do efficiently, my best solution is to downshift but the trouble is that the motor is very efficient (surprizingly so over a large RPM band) but only right near the point that it smokes which is hard to find. Cheers Ryan