Question about hpop???
#31
#32
PMR means powdered metal rods- Basically the PMR rods are constructed like an asprin- they dump powdered metal (graphite??) into a mold, then under intense pressure it's compacted, an then run through a furnace to sorta weld it all together. That's why they are more prone to cracking- they were never "solid" in the first place.
#34
#35
I hear ya on the $. If only the Marines paid you what you are worth.....
My wish is a H2E turbo & Pulse big oil. But that is about 4K I do not have!
#36
Rich, I guess were I was going with this was like Tenn you can push the limits of PMRs with just an upgraded turbo and sticks.
#37
#38
#39
Tony Wildman (www.totaldieselperformance.com) or DP can make the tunes for you. I run Tony's tunes. Plus he doesn't charge for reburns.
#40
I believe Tenn is running dp again, his 400 hp was after live tuning with Jody. The jumbo shrimp might give the stock turbo some egt issues, but then I'm still learning, I'll refer to those who are more knowledgable.
#41
Hey Rich, you mentioned the stock turbo won't last long with bigger injectors, and Kris said the same thing. Why is that? Is it a heat thing, or a higher revving thing?? I'm pretty sure my compressor wheel ate something, and was not due to the new injectors.... Man I do want more air though- maybe I can sell a kid or something....
#42
#43
Hey Rich, you mentioned the stock turbo won't last long with bigger injectors, and Kris said the same thing. Why is that? Is it a heat thing, or a higher revving thing?? I'm pretty sure my compressor wheel ate something, and was not due to the new injectors.... Man I do want more air though- maybe I can sell a kid or something....
However the reason the stock turbo won't last long is because it will put too much pressure on the center section of the turbo, mainly the thrust bearing. With a backpressure:boost ratio of essentially 2:1, at 25 psi of boost you'll have 50 psi of backpressure. That much pressure pushing on the exhaust side will prematurely wear the bearing in the turbo.
When you switch to a larger exhaust housing, like a 1.15 with a van or a 1.0 from Beans, you reduce the backpressure. The 1.15 housing has a backpressure:boost ratio of essentially 1:1 up to about 35 psi of boost. As you can easily see, then if you're running 25 psi of boost, you'll only have 25 psi of backpressure, which is much easier on the turbo and it's bearing. The 1.0 housing is somewhere in the middle with a guestimated ratio of 1.5:1.
That reduction in backpressure also allows the turbo to work more efficiently. So, you'll lose actual boost numbers, but be gaining power because the turbo is actually flowing more air. Example: when I switched to a van turbo, I was pushing 34 psi through my stock turbo. After the van went on, I was only pushing 26 psi through it, with no other changes. Although my boost numbers dropped, the truck was making more power because the van turbo was more efficient at moving air.
Hope that helps.