Turbo choices
03-01-2005, 12:31 PM
#31
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Hi Pauerman,
Are you sure those points are correct ?
What rpm range did you base your plots on ?
Are you sure those points are correct ?
What rpm range did you base your plots on ?
85% Ve
Pr 2.0, 2.2, 2.4, 2.6, 2.8
Above the pics, I've listed the different airflow values for the corresponding boost levels. I'm pretty sure those lbs/min flow #'s are accurate to the 2.5L
03-01-2005, 12:58 PM
#32
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Hi Pauerman,
If your calculation are accurate & base on a pressure
ratio of 2.4 bar, I would think my GT2540R would be
an even better choice when you take into consideration
of much earlier boost threshold.
If your calculation are accurate & base on a pressure
ratio of 2.4 bar, I would think my GT2540R would be
an even better choice when you take into consideration
of much earlier boost threshold.
03-01-2005, 07:31 PM
#33
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Originally Posted by J Chen
Hi Pauerman,
If your calculation are accurate & base on a pressure
ratio of 2.4 bar, I would think my GT2540R would be
an even better choice when you take into consideration
of much earlier boost threshold.
If your calculation are accurate & base on a pressure
ratio of 2.4 bar, I would think my GT2540R would be
an even better choice when you take into consideration
of much earlier boost threshold.
03-01-2005, 08:08 PM
#34
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Hi Pauerman,
Why the need to change the TPS ? You refering to the water
temp. switch right ? No need to change. Because of the fact
that the TO4S housing is so huge, I actually had to cut the
original turbo mount real low to get it fitted.
Why the need to change the TPS ? You refering to the water
temp. switch right ? No need to change. Because of the fact
that the TO4S housing is so huge, I actually had to cut the
original turbo mount real low to get it fitted.
03-01-2005, 08:11 PM
#35
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I mentioned the TPS switch cause I thought Rage was using a TO4S on his 2.8L setup and I think he mentioned that he had to use a different TPS switch.
03-01-2005, 08:28 PM
#37
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I thought Rage had to change over cause of clearance issues with the T04S - I could be wrong.
Here is the GT2540R mapped with the same lb/min load points as the previous maps. I still think the points land on higher areas of efficiency on the GT30R map.
Here is the GT2540R mapped with the same lb/min load points as the previous maps. I still think the points land on higher areas of efficiency on the GT30R map.
03-01-2005, 08:38 PM
#38
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Does Rage run a TO4S now ? Do you run your car at
such high boost ? For me, I set my goals at 2.4 pressure
ratio. But do remember that you're looking at one end
of the plot & let's not forget the importance of flow
through the rest of the map.
such high boost ? For me, I set my goals at 2.4 pressure
ratio. But do remember that you're looking at one end
of the plot & let's not forget the importance of flow
through the rest of the map.
03-01-2005, 09:35 PM
#39
Pauerman,
Like JChen said Using max rpm as the only reference point is not good.
You have to map out the rpm's at which you will be making boost.
Like 3000rpm to 6500rpm. Because if you are on the left of the surge line until (example 4500 rpm). You will not make boost before 4500 rpm.
Plus you will weir out the turbo really fast.
For example check out this video of a 240SX on the dyno with a really big turbo. At the end of the video they take the car for a street. Look at the tach to see at what RPM the car starts too pull. Sure the car spins but what a wast....
Right click and save as
http://www.centralfloridaturbo.com/v...sans13dyno.wmv
Like JChen said Using max rpm as the only reference point is not good.
You have to map out the rpm's at which you will be making boost.
Like 3000rpm to 6500rpm. Because if you are on the left of the surge line until (example 4500 rpm). You will not make boost before 4500 rpm.
Plus you will weir out the turbo really fast.
For example check out this video of a 240SX on the dyno with a really big turbo. At the end of the video they take the car for a street. Look at the tach to see at what RPM the car starts too pull. Sure the car spins but what a wast....
Right click and save as
http://www.centralfloridaturbo.com/v...sans13dyno.wmv
03-01-2005, 11:18 PM
#42
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Originally Posted by Edman951
Pauerman,
Like JChen said Using max rpm as the only reference point is not good.
You have to map out the rpm's at which you will be making boost.
Like 3000rpm to 6500rpm. Because if you are on the left of the surge line until (example 4500 rpm). You will not make boost before 4500 rpm.
Plus you will weir out the turbo really fast.
Like JChen said Using max rpm as the only reference point is not good.
You have to map out the rpm's at which you will be making boost.
Like 3000rpm to 6500rpm. Because if you are on the left of the surge line until (example 4500 rpm). You will not make boost before 4500 rpm.
Plus you will weir out the turbo really fast.
Considering a 90% Ve for the 2.5L @ 3000 RPM I've come up with:
The other points are the 6500 RPM, 85% Ve values I listed earlier
Pr 2.0 = 16.77 lbs/min
Pr 2.2 = 18.45 lbs/min
03-02-2005, 12:38 AM
#43
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Aaaah Pauerman,
There you go, look at the 2 plots. Which one starts to
move air sooner ? BTW, the 2 V does not have better
VE at lower rpm over the 16V head rather it has better
port velocity at lower rpm over the 16V head.
There you go, look at the 2 plots. Which one starts to
move air sooner ? BTW, the 2 V does not have better
VE at lower rpm over the 16V head rather it has better
port velocity at lower rpm over the 16V head.
