Attention: TDR Forum Junkies About 2 months ago a friend of mine came to me asking me questions about the P7100 injection pump. I thought that this was odd since he has a 2002 Cummins - Auto. I answered his questions and then asked why he was asking me the questions. He tells me that his VP44 is on its way out. Then he tells me that his uncle will give him a 175 HP P7100 pump if he wanted it because it could never make any worthy horsepower. Next he tells me that he wants to put the P-pump on his truck. Though his knowledge about the Cummins is minimal he is very mechanically oriented and I thought that he was capable of handling the project.
First the VP44 and all associated parts were removed. It turns out that his uncle had all of the parts of a 12 valve engine minus the block and head. So the 12V timing cover and Pump were installed. Next a Piers custom cam with a mechanical fuel pump lobe was installed. All other associated 12V fuel system parts were installed. He rebent the fuel lines to work with the P-pump. They aren't the prettiest but they work.
After he had the truck running he complained about low power even after he slid the plate forward and it was defueling at 2200 RPM's before it shifted. I told him don't worry we will get it right. So his cousin and I proceeded to tune the pump. We took out the 131 DV's and installed some 181 DV's left over from another project. The gov springs were tightened 2 clicks, the cam plate was ground to resemble a 10 and the arenoid was adjusted.
After the everything was reassembled he took it out for a test drive again. As he stomped the accelerator his first words were HOLY S4!T. He couldn't believe that it was the same pump. He had also said before we tuned the pump he was beginning to think that his uncle was correct and that the 175 HP pump just wasn't able to make much horsepower. I was glad to prove him wrong and put a huge smile on my friends face. By the Seat-Of-The-Pants Dyno it feels like it is about 290 Rear-Wheel HP. It could be more but he still has the tiny HY-35 turbo and he needs to have it run cool enough to pull his camper. All in all it was a success.
Phill
First the VP44 and all associated parts were removed. It turns out that his uncle had all of the parts of a 12 valve engine minus the block and head. So the 12V timing cover and Pump were installed. Next a Piers custom cam with a mechanical fuel pump lobe was installed. All other associated 12V fuel system parts were installed. He rebent the fuel lines to work with the P-pump. They aren't the prettiest but they work.
After he had the truck running he complained about low power even after he slid the plate forward and it was defueling at 2200 RPM's before it shifted. I told him don't worry we will get it right. So his cousin and I proceeded to tune the pump. We took out the 131 DV's and installed some 181 DV's left over from another project. The gov springs were tightened 2 clicks, the cam plate was ground to resemble a 10 and the arenoid was adjusted.
After the everything was reassembled he took it out for a test drive again. As he stomped the accelerator his first words were HOLY S4!T. He couldn't believe that it was the same pump. He had also said before we tuned the pump he was beginning to think that his uncle was correct and that the 175 HP pump just wasn't able to make much horsepower. I was glad to prove him wrong and put a huge smile on my friends face. By the Seat-Of-The-Pants Dyno it feels like it is about 290 Rear-Wheel HP. It could be more but he still has the tiny HY-35 turbo and he needs to have it run cool enough to pull his camper. All in all it was a success.
Phill
Last edited:
