1500 Lb Hot Rod with a Duramax
Quote:
Originally Posted by
DmaxHawk
You've got the right idea for the tune except for the fuel. You don't want to take fuel away, instead add it. The reasoning for this is that if you take fuel away, it takes more time with your foot on the pedal to get going to speed which in turn takes mileage away...So for your tune...You need to lower boost to nearly 0 psi like you said but only in the cruise area otherwise it will greatly affect driveability. Advance timing, again in the cruise area. And increase fuel... This will result in a high-mileage tune still with enough get-up to pass someone in a hurry if needed. PM me if you would like to see my tune I made for my LBZ
This Duramax motor is going into a 1500 Lb Hot Rod. I don't see the need for the extra oomph to pass someone. It is not like I'll be pulling a horse trailer up the pass.
I do not see how it can possibly be true that for a given RPM, if I increase the fuel, that I can use less fuel at that RPM. It is non-sensicle to me.
My plan is to lower the vehicle weight, only 1500 lbs or so, and decrease my drag and wind resistance as much as possible, tall narrow tires, etc..., and then to work at lowering my fuel useage across the board to save on MPG.
If it accelerates like a snail, that is OKAY, because this profile is about MPG performance, not 0-60 performance. I don't need HP and Torque until I am ready to Rock-and-Roll with the Hot Rod. Then I can select a Hotter profile and turn the fuel screws on...
Fact is, on the DieselMarine website, and even on the Cummins Marine website, you can see the published fuel curves of each motor vs RPM vs HP and Torque. The same displacement motor burns more fuel at RPM to get more HP. The motor may be more efficient in terms of how much less waste it has at that RPM and performance level, but, if I don't need that performance level at tha RPM, then it seems to me that I am still wasting fuel at that RPM.
I'd love to see a fuel curve for the motor that is getting mapped more fuel, but is actually using less fuel per RPM. Somehow, I don't think this fuel curve exists. I'd love some links to a fuel curve showing that the -miracle happens here- is actually possible and happening.
Thanks,
Gene