Compressor map
01-23-2009, 11:01 AM
#1
Member
Thread Starter
Compressor map
I found this last night----thought people might really find it useful. Its the compressor map to the Lysholm 2300R supercharger(very similar to our SC).
There's a lot of info there!!! Its a pdf--maybe someone could post it as a pic.
I find the data facinating. At 8-9psi or 1.6 pressure ratio(what most stock cars see at redline) the Supercharger is at its peak efficiency island of 65%. This means that on a 77*F day-- SC discharge temps are 185*F.
Once you put on a Larger pulley (168mm) and boost goes up to 12psi or 1.9 pressure ratio. You see that SC efficiency goes down to 63% and outlet temps rise 40*F to 225*F!!!!
The Huge pulleys (178mm+) that increase boost to 14-16psi or 2-2.2 pressure ratio. These drop SC effeciancy WAAAAAAAAAAAAAY down to 56%!! So the SC is compressing more air at a lower efficiency. Discharge temps are now 105*F above stock at 290*F!!!!!!!!!!!!!!!
---no wonder we need increased cooling.
Even though we are only incresing HP by 25% or so.....we are asking our intercoolers, which were designed to work decently at 185*F, to remove 80% more heat.
There's a lot of info there!!! Its a pdf--maybe someone could post it as a pic.
I find the data facinating. At 8-9psi or 1.6 pressure ratio(what most stock cars see at redline) the Supercharger is at its peak efficiency island of 65%. This means that on a 77*F day-- SC discharge temps are 185*F.
Once you put on a Larger pulley (168mm) and boost goes up to 12psi or 1.9 pressure ratio. You see that SC efficiency goes down to 63% and outlet temps rise 40*F to 225*F!!!!
The Huge pulleys (178mm+) that increase boost to 14-16psi or 2-2.2 pressure ratio. These drop SC effeciancy WAAAAAAAAAAAAAY down to 56%!! So the SC is compressing more air at a lower efficiency. Discharge temps are now 105*F above stock at 290*F!!!!!!!!!!!!!!!
---no wonder we need increased cooling.Even though we are only incresing HP by 25% or so.....we are asking our intercoolers, which were designed to work decently at 185*F, to remove 80% more heat.
01-23-2009, 11:39 AM
#5
Member
Thread Starter
In case you guys were wondering---the X axis is metric air flow.....the conversion is pretty much..
15m/min=355hp
20m/min=470hp
22m/min=518hp
25m/min=588hp
15m/min=355hp
20m/min=470hp
22m/min=518hp
25m/min=588hp
01-23-2009, 11:53 AM
#7
Super Moderator
While they aren’t particularly efficient, each tends to have an airflow and rotational speed range where their losses are minimized. It’s the same characteristics seen from any compressor, be they crankshaft or exhaust driven. Although we’re clearly reaching a point of diminishing returns by spinning the supercharger faster, its advantageous affect on overall performance is undeniable - in many instances.
Should any member still be contemplating increasing his boost, several here can validate its efficacy. It’s prudent to upgrade the system’s heat dissipation capacity concurrently and, of course, ensure that the upgraded hardware is properly installed. IMHO.
from the M112 kompressor:
Should any member still be contemplating increasing his boost, several here can validate its efficacy. It’s prudent to upgrade the system’s heat dissipation capacity concurrently and, of course, ensure that the upgraded hardware is properly installed. IMHO.
from the M112 kompressor:
Last edited by splinter; 10-06-2010 at 07:02 AM.
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01-23-2009, 01:38 PM
#9
Member
Thread Starter
Can someone who knows explain what the stock gear ratios are? In other words with the stock pulleys---6500rpm at the engine is = what SC rpm??
I know the SLR and E55 have different internal gearing in the SC head.
What I really liked about this chart is GREEN line--(Power) which shows the power consumption of the SC. At stock boost ---its eating up about 20kw or 27hp. On the upper end of what our cars see is about 55 kw or 73hp. Not the 100hp that I was lead to believe.
I know the SLR and E55 have different internal gearing in the SC head.
What I really liked about this chart is GREEN line--(Power) which shows the power consumption of the SC. At stock boost ---its eating up about 20kw or 27hp. On the upper end of what our cars see is about 55 kw or 73hp. Not the 100hp that I was lead to believe.
01-23-2009, 03:19 PM
#10
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E-ZGO 53hp., 1999 E 430 sport, 2004 E 55, 2008 Tahoe LTZ on 24"s
Can someone who knows explain what the stock gear ratios are? In other words with the stock pulleys---6500rpm at the engine is = what SC rpm??
I know the SLR and E55 have different internal gearing in the SC head.
What I really liked about this chart is GREEN line--(Power) which shows the power consumption of the SC. At stock boost ---its eating up about 20kw or 27hp. On the upper end of what our cars see is about 55 kw or 73hp. Not the 100hp that I was lead to believe.
I know the SLR and E55 have different internal gearing in the SC head.
What I really liked about this chart is GREEN line--(Power) which shows the power consumption of the SC. At stock boost ---its eating up about 20kw or 27hp. On the upper end of what our cars see is about 55 kw or 73hp. Not the 100hp that I was lead to believe.
01-23-2009, 09:53 PM
#13
MBWorld Fanatic!
Can someone who knows explain what the stock gear ratios are? In other words with the stock pulleys---6500rpm at the engine is = what SC rpm??
I know the SLR and E55 have different internal gearing in the SC head.
What I really liked about this chart is GREEN line--(Power) which shows the power consumption of the SC. At stock boost ---its eating up about 20kw or 27hp. On the upper end of what our cars see is about 55 kw or 73hp. Not the 100hp that I was lead to believe.
I know the SLR and E55 have different internal gearing in the SC head.
What I really liked about this chart is GREEN line--(Power) which shows the power consumption of the SC. At stock boost ---its eating up about 20kw or 27hp. On the upper end of what our cars see is about 55 kw or 73hp. Not the 100hp that I was lead to believe.
I always belived stock ratio is 151mm(crank pulley dia) / 91mm (SC pulley dia) = 1.65
therefore SC rpm @ max engine rpm = 6500 x 1.65 = 10,725 rpm -Stock
therefore if SC pulley ...
.. doesn't the "built in ratio 1.35", in the LYS 2300 spec above, is the internal gearing ?
.. therefore effective max rev allowed is 13,500 x 1.35 = 18225 ?
I think that our model version is closer to LYS 2300 AXhere:
[IMG]
[/IMG]and its Performance graph gets slightly different
[IMG]
[/IMG]
01-24-2009, 10:52 AM
#16
Senior Member
Keep in mind that the Temperature-Curves in the pictures are in Degrees Celsius (not Fahrenheit) and WITHOUT INTERCOOLING, to get a comparable baseline for each SC-Model.
10-23-2012, 01:02 PM
#20
Super Member
I find the data facinating. At 8-9psi or 1.6 pressure ratio(what most stock cars see at redline) the Supercharger is at its peak efficiency island of 65%. This means that on a 77*F day-- SC discharge temps are 185*F.
Once you put on a Larger pulley (168mm) and boost goes up to 12psi or 1.9 pressure ratio. You see that SC efficiency goes down to 63% and outlet temps rise 40*F to 225*F!!!!
Once you put on a Larger pulley (168mm) and boost goes up to 12psi or 1.9 pressure ratio. You see that SC efficiency goes down to 63% and outlet temps rise 40*F to 225*F!!!!
