422 LSX w/ Twin PT76's on KYTP kit
05-05-2011, 04:01 PM
#41
I was shocked to hear it also. He said it came up REAL fast! With the CO2 set the same at the launch.
Going down track, he used to put 44 psi on the gate to make 28#'s of boost. He lowered it to 18 psi on the gate last night and made 24#'s of boost. At that setting, the car ran 172 MPH.
Going down track, he used to put 44 psi on the gate to make 28#'s of boost. He lowered it to 18 psi on the gate last night and made 24#'s of boost. At that setting, the car ran 172 MPH.
05-05-2011, 06:54 PM
#42
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I was shocked to hear it also. He said it came up REAL fast! With the CO2 set the same at the launch.
Going down track, he used to put 44 psi on the gate to make 28#'s of boost. He lowered it to 18 psi on the gate last night and made 24#'s of boost. At that setting, the car ran 172 MPH.
Going down track, he used to put 44 psi on the gate to make 28#'s of boost. He lowered it to 18 psi on the gate last night and made 24#'s of boost. At that setting, the car ran 172 MPH.
From 44 to get 28
to 18 to get 24
Sounds like a gate leak on the TC's that somehow was fixed R&Ring the PT's.....would also make sense that it is now spooling quicker with the bigger turbines....
How much mph out of the TC's at 24psi?
05-06-2011, 07:21 AM
#45
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That sounds strange also. What psi did it make with the TC's and zero co2? Reason I ask is I've seen data on a similar combo with TC76's that only took 28psi co2 to get 26psi boost with 10psi springs in the gate.
From 44 to get 28
to 18 to get 24
Sounds like a gate leak on the TC's that somehow was fixed R&Ring the PT's.....would also make sense that it is now spooling quicker with the bigger turbines....
How much mph out of the TC's at 24psi?
From 44 to get 28
to 18 to get 24
Sounds like a gate leak on the TC's that somehow was fixed R&Ring the PT's.....would also make sense that it is now spooling quicker with the bigger turbines....
How much mph out of the TC's at 24psi?
Think of it as a lever. or see-saw. The TC78s are like a 2 kids on a crooked see-saw. One side if longer than the other. The shorter side being the turbine, is harder to get going.
With the TCs you are trying to push a 78mm wheel with a 68mm wheel. Yes it is a smaller wheel, but that smaller wheel is directly attached to a bigger wheel.
Wheres as with the PT7675, you are are almost 1:1 ratio.
05-06-2011, 09:43 AM
#48
That sounds strange also. What psi did it make with the TC's and zero co2? Reason I ask is I've seen data on a similar combo with TC76's that only took 28psi co2 to get 26psi boost with 10psi springs in the gate.
From 44 to get 28
to 18 to get 24
Sounds like a gate leak on the TC's that somehow was fixed R&Ring the PT's.....would also make sense that it is now spooling quicker with the bigger turbines....
How much mph out of the TC's at 24psi?
From 44 to get 28
to 18 to get 24
Sounds like a gate leak on the TC's that somehow was fixed R&Ring the PT's.....would also make sense that it is now spooling quicker with the bigger turbines....
How much mph out of the TC's at 24psi?
While it is possible that something was leaking before, it's doubtful as he had taken it apart a couple of times before and it always required the same pressure on the back of the gates for max effort. Sadly, I've been telling him that he needs to keep a log of the different settings for the AMS but he but he never does so everytime we go to the track we start from scratch.
While I take care of the tune, it's up to him to do the boost controller so i have no idea how to operate it. Once Holley gets the boost control module of the EFI done, then I'll take over and have all the logs for data points.
05-06-2011, 09:51 AM
#49
18PSI of Co2 + 10 # spring sounds right in my mind for that setup. So you need 28# of pressure to get 24# of boost. I can't recall exactly but our combo needed 25# of Co2 + a 4psi spring to make 25# of boost. So it took 29# of pressure to make 25# of boost.
05-06-2011, 11:37 AM
#51
1) Launch data vs actual down to the tenth
2) Total PSI vs actual down to the tenth
Once you have the data it doesn't change or at least shouldn't unless you make a change to the system or your WG is sticking/hung. What I am somewhat curious about is why it makes more boost with just a turbo change with the same settings, leaves me to believe that the AMS was infront of the motor and now its mechanically making more boost.
- PT
05-06-2011, 05:15 PM
#54
The TC78's combo worked well. I don't think "optimized" is the right word though. I think that the TC78's would rather be on a slightly smaller motor. Last I heard was that BonnarLS1 was going to be trying them on his 380ci LS3 setup. I think they will like that much better. He currently has the MPT70's on his car. We likely wont ever see them go max effort on his car because he's
05-06-2011, 08:13 PM
#56
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I have the same turbos as him. With a 2.5 lb spring and 17 psi on the gate I make 19 lbs of boost. I want to say at 24 or 25 lbs I went 185 but my car weighs less.
05-06-2011, 08:18 PM
#57
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I believe that before it would make 8 psi on the spring and now it makes 10 psi on the spring.
While it is possible that something was leaking before, it's doubtful as he had taken it apart a couple of times before and it always required the same pressure on the back of the gates for max effort. Sadly, I've been telling him that he needs to keep a log of the different settings for the AMS but he but he never does so everytime we go to the track we start from scratch.
While I take care of the tune, it's up to him to do the boost controller so i have no idea how to operate it. Once Holley gets the boost control module of the EFI done, then I'll take over and have all the logs for data points.
While it is possible that something was leaking before, it's doubtful as he had taken it apart a couple of times before and it always required the same pressure on the back of the gates for max effort. Sadly, I've been telling him that he needs to keep a log of the different settings for the AMS but he but he never does so everytime we go to the track we start from scratch.
While I take care of the tune, it's up to him to do the boost controller so i have no idea how to operate it. Once Holley gets the boost control module of the EFI done, then I'll take over and have all the logs for data points.
05-07-2011, 09:58 AM
#60
19# of boost on your motor its 1.03# of Co2/Spring per # of boost at 19#
25# of boost on this motor is 1.17# of Co2/Spring per # of boost at 25#
25# of boost on my motor is 1.14# of Co2/Spring per # of boost at 25#
As boost increases the # of Co2/Spring is going to increase to fight the pressure on the face of the valve(backpressure)