Hey there Mr Moto…there is a thread under ‘tractor operation’ about cool downs….lots of topic in there regarding diesel / turbos maybe you could help us out?Hey Guys new to this forum. I own a performance shop and I build turbo kits. I started in the diesel world with a 4bt swapped 47 Chevy currently making 600whp 950 tq on 70 psi. I also build custom turbo kits for bmw platforms. I purchased 5 acres of property and jumped on buying an l2501 HST. Reason being is I knew this engine was de tuned from all my research and not having a dpf was a big plus. I am also a huge fan of mechanically controlled Diesel engines. I started off doing a basic rpm increase to 2600rpms. It helped with running my PTO chipper but I eventually found out I needed more fuel. I made a very slight fuel adjustment and it did increase the power. Only issue was of course slightly more smoke. After reading about the D1703 I figured out Kubota retarded the timing to 5 degrees btdc for emissions and to help it get under 25hp and also the air box they are using is a major restriction. The 1703 can run up to 14 degrees btdc. I bumped the timing up to 9 btdc and installed a higher flowing air box and all I can say is wow this thing pulls up my driveway which is a 15% grade like no problem in mid range gear at 2300rpms. Before it would bog down below 1800. I am guessing it’s in the mid 30hp range. Just wanted to share this info. And I will be also installing an oem rhf3 Kubota turbocharger. I’ll be running low boost probably around 5-7 psi. Since I am at 3,000 feet elevation it will help a ton. I’ll post pictures and progress hoping for a solid 40hp out of this tractor
You’re EGT’s appear to be inline with both mine and NetMagi’s findings. Very good!
To confirm, you’ve advanced the injection timing and increased the fuel a 1/4 turn, and left the RPM limit stock, correct?
I believe most guys willing to perform this modification are going to want to keep the stock RPM limit.all correct,
my bro n law and i decide to leave the throttle limit stock. the D1703 M DI E2B model is 36.7 HP @ 2800 rpm with max torque @ ~1700 rpm.
the D1703 in the stock l2501 is 24.8 HP @ 2200 rpm and max torque @ ~1500 rpm.
what are the benefits of adding x300 rpms.... just speed and HP right?
1 more question.... do you think the temps recorded (1070*) going up the ridge are good or should i try to push that # up to the ~1200* tweaking the fuel?
i work the tractor hardest moving dirt.... BB on back with rippers set aggressive and bucket in float scooping up dirt at the same time. this is the temps/data i need.
prolly gonna be summer before i can do heavy dirt work... its gonna be a wet spring says the farmers almanac.
thanks mike!I believe most guys willing to perform this modification are going to want to keep the stock RPM limit.
I personally wouldn't mess with anything or add more fuel until you've had a chance to operate the tractor a bit longer. I think your EGT's are right where you want them. Adding more fuel will increase the EGT's. If you're getting the desired performance now, there's no need.