New upgraded avnt 37 charger??????
- Thread starter Dan@PPE
- Start date
I just put one of these on an a 04 lly tonight, I havent had a chance to drive it yet, so I will report back tomorrow. I am sure I will have to make some tuning changes, so we will see what comes about. By the way I dont have a dyno nearby, so I cant give any hp numbers.
I know larry I would have taken some, but the last time I had the camera in the garage, it kind of broke
Looks very close to a 4088R. Little higher pressure ratio but seem to mave almost the same amount of air
Yes, I am curious to see some dyno numbers on one of these units. The only one of them I have touched ended up in a twin setup so it still doesn't tell us anything about it in a single application. It definitely has potention and also room for improvement as well.
Basics:
Pressure Ratio - 1:1 is no boost. 2:1 is 15psi boost. 3:1 is 29lb boost. 4:1 is 44lb boost. Numbers rounded.
Lb/Min of air - How much weight of air is pumped into the engine. A normal hair on fire "tune only" truck will use about 75lb of air at 3200rpm at 32psi boost if my data is right. We routinely run turbos WAY off their maps, so take the limits with a grain of salt.
Dashed line on the left: Surge line. If you try to operate the turbo to the left, it will choke on the air and "pulse" sharply. Turbo bark is a form of surging. It destroys turbo bearings.
Islands: Efficiency levels. The more efficient, the less heat is developed boosting the air, and the less drive pressure it takes.
RPM Lines: Diagonal lines for turbo RPM. Overspeeding is the #2 cause of diesel turbo death when racing (EGT's are #1). But you can overspeed quite a bit before failure.
Pressure Ratio - 1:1 is no boost. 2:1 is 15psi boost. 3:1 is 29lb boost. 4:1 is 44lb boost. Numbers rounded.
Lb/Min of air - How much weight of air is pumped into the engine. A normal hair on fire "tune only" truck will use about 75lb of air at 3200rpm at 32psi boost if my data is right. We routinely run turbos WAY off their maps, so take the limits with a grain of salt.
Dashed line on the left: Surge line. If you try to operate the turbo to the left, it will choke on the air and "pulse" sharply. Turbo bark is a form of surging. It destroys turbo bearings.
Islands: Efficiency levels. The more efficient, the less heat is developed boosting the air, and the less drive pressure it takes.
RPM Lines: Diagonal lines for turbo RPM. Overspeeding is the #2 cause of diesel turbo death when racing (EGT's are #1). But you can overspeed quite a bit before failure.
Thanks. Where are the RPM lines on this map?? I'm not seeing them.
I take it the small island is the most turbo at its most efficient level??
I get the surge line (I think) ... Trying to run more lbs/air per minute at a lower boost pressure is what results in surging. Turbo bark I get.... Learned what that was day after I got the truck
Is there a formula for figuring out "boost pressure-turbo speed-lbs of air per minute"???? I understand it is based on turbo size, but is there any simple way to figure out how much air it moves??
Turbos are kinda foreign to me, so please bear with me.
The rpm lines are curved lines, this one has a intended limit of 109969 rpm.
These maps are only accurate to the extent that you take actual measurements, pre and post compressor, for the calculation of PR. Actual PR is always larger that that calculated from "perfect conditions" assumptions. Thus rpm is also always greater than we think. Like Pat said we run WAY off these maps with assumed risk. I would not be surprised to see this one run to 160,000 rpm, easily accomplished with some intake restriction, and some elevation. Eff goes in the toilet also, 50% or thereabouts.
These maps are only accurate to the extent that you take actual measurements, pre and post compressor, for the calculation of PR. Actual PR is always larger that that calculated from "perfect conditions" assumptions. Thus rpm is also always greater than we think. Like Pat said we run WAY off these maps with assumed risk. I would not be surprised to see this one run to 160,000 rpm, easily accomplished with some intake restriction, and some elevation. Eff goes in the toilet also, 50% or thereabouts.
Dan, can you PM me a price when you get a chance? How hard are these turbos to spool compared to stock? Do these turbos have the same water cooling and sensors etc as the stock turbo? Thanks.
Is there a formula for figuring out "boost pressure-turbo speed-lbs of air per minute"????
simple, no, but here is a project I did on the LLY.
I would like to understand these statements better. Can you elaborate?
Factually only please, how does this differ from a Cheetah?