there you go..! i take a basic observation that i have made and apply it to a related automotive sittuation.. post an oppinion and BAAMM..! in chimes an expert with the info to back me up or set me straight...! this site is really good guys..! one question for you cookie... when you are superheating that air charge, are you actually LOOSING power production from your engine at that point..?

 

I'm curious as to that one too. I mean, your're getting more air in, so you can burn more fuel and theoretically make more power. But, that air is hotter, which hurts power. So I don't know that one, but I'd like too!!

 

i have heard coflicting info on this also... obviously our mules have intercoolers so cooler air in is important, but i have also read that HOTTER air actually makes a diesel run more effeciently.... i'm sure there are limits to how hot that incoming air can be, and once you get past that temp i'm sure you are loosing power... does anyone have some solid info on this..?

 

That's difficuly to quantify without a load dyno capable producing max boost. You really aren't going to make any more power pushing a stock turbo to 32 psi then you would at 27, but adding that extra little bit isn't going to make it fall on it's face either. There are too many variables involved for there to be a difinitive answer, but basically if you can easily make 30+ you need a bigger turbo.

As far as the efficiency standpoint. Cooler and denser will always make more power for a given volume. Where you want the higher temp is in the core....the metal around the combustion chamber. More heat here makes compression combustion easier, but the cooler intake charge means there is more oxygen available for the actual combustion process.

 

Not exactly what my pocketbooks wanted to hear, especially since I hit 30+ psi easily. Bigger turbos can get pricey. Man, this hobby can get expensive.

 

Take it with a grain of salt. Like I said, there are lots of variables. I say need, but what I mean is "could benefit from". If you are happy with it's performance then it doesn't need anything.

 

that all makes perfect sense to me... it also backs up lots of other things that i have heard... one notable statement was that a bigger turbo helps you make more power by flowing MORE air at LOWER PSI of boost... more volume of air at lower pressure helps you to make more power without blowing the heads off... this is also supposed to help keep the egts low also... i don't know if this is true, but i think it matches up to what you are saying...

 

To me, "could benefit from" almost = "needs" Apparently I like salt.

 

VERY good point... i am happy with the power my mule is making.... plenty of boost... plenty of power... i just need to get a turbo back exhaust so i can run some lower egts when towing... i also want to add a switch to manually lock up the t/c to help keep tranny heat down when towing in the mountains...

 

Johnny, the following is quoted from a site talking about the H2E turbo upgrade. Maybe a little insightful:

Exhaust backpressures or "drive pressures" as they are called in the turbocharger business plays a huge role in how much boost an engine can produce before stress on engine components fail. Drive pressure is the amount of pressure required to "drive" a certain amount of boost with a particular turbo. These numbers can usually be derived into a mathematical equation. For instance, a stock 7.3L turbo has a drive pressure approximately of a 2/1 ratio. This means for every 1 lb of boost, it takes 2 lbs of drive pressure to produce this. So, a stock turbo producing 35 lbs of boost can easily produce 70 lbs of drive pressure. The ballbearing turbos on the market estimate about a 1.75/1 ratio. That same truck with 35 lbs of boost will generate about 61.25 lbs of drive pressure.
Now, this turbo kit has a drive pressure close to 1/1. That means the same boost levels of 35lbs only produce approximately 35lbs of drive pressure. Your head gaskets and rods are greatly relieved of excess pressure. So, for high boost levels and high HP applications, this turbo is a must for long life of engine components.

--JT

 

i think you just like having emptywalletitis..!

 

Heh guys, I went ahead and shortened the wastegate rod about 1/4" last night and left the red line connected. I can now hit 19psi before the wastegate opens, 16psi previously. I was surprised how soft that spring was, I could un-seat it by hand, after adjusting I could not move it by hand.

One notable observation: before this cruiseing at 70mph I was running 3psi, now I get consistently 4 psi, same road, same speed, etc. I only gained 3 psi but what a difference!

Bowedup