My M62 E85 car will wax the floor vs most TVS cars on gasoline...
10-16-2009, 03:48 PM
#187
I'm going to try and make this easy as many may have a problem understanding these pics.
They are in Cubit meters and you guys are used to CFM. The conversion is .5586. That means that CFM is a little over 1/2 of what the bottom numbers say.
so let's say you have a 2.7" pulley on your M62 as posted earlier. At 7k rpm your blower will be spinning 16,333 rpm. It will move (depending on boost) about 550 cfm of air. On the purple charts that would be about 1000 on the lower number. Notice the M62 chart doesn't even go past about 825? That's cause the M62 is crappy at that CFM level. I would guess a 2.7" guy to have ~17.5 psi which on the left #'s of the chart would be 2.2 pressure ratio. The M62 doesn't show past 2.0 because it's crappy up there. This is why the M62 sucks for up top performance.
The TVS using the same CFM and pressure ratio (boost) numbers is at 69% efficiency, which is very good. So you can see why it works well compared to the M62 with a 2.7". But also take note that anyone talking about a TVS at 29psi is talking about a pressure ratio of 3.0 which is way past where the TVS works well. Chart stops at 2.2 or 17.6 psi
But now let's look at those blowers again at 3k engine rpm with the same conditions. YOu're at ~175 CFM or ~300 on the lower graph showing cubic meters. Guessing 12psi? or 1.8 on pressure ratio. M62 is 62% efficient and the TVS is 63%. Notice how the same car with different blowers in Ebristols graph is also making the same power at 3k rpm.
Of course non of this covers the volumetric efficiency of the blowers and the TVS really shines there too under high boost levels.
They are in Cubit meters and you guys are used to CFM. The conversion is .5586. That means that CFM is a little over 1/2 of what the bottom numbers say.
so let's say you have a 2.7" pulley on your M62 as posted earlier. At 7k rpm your blower will be spinning 16,333 rpm. It will move (depending on boost) about 550 cfm of air. On the purple charts that would be about 1000 on the lower number. Notice the M62 chart doesn't even go past about 825? That's cause the M62 is crappy at that CFM level. I would guess a 2.7" guy to have ~17.5 psi which on the left #'s of the chart would be 2.2 pressure ratio. The M62 doesn't show past 2.0 because it's crappy up there. This is why the M62 sucks for up top performance.
The TVS using the same CFM and pressure ratio (boost) numbers is at 69% efficiency, which is very good. So you can see why it works well compared to the M62 with a 2.7". But also take note that anyone talking about a TVS at 29psi is talking about a pressure ratio of 3.0 which is way past where the TVS works well. Chart stops at 2.2 or 17.6 psi
But now let's look at those blowers again at 3k engine rpm with the same conditions. YOu're at ~175 CFM or ~300 on the lower graph showing cubic meters. Guessing 12psi? or 1.8 on pressure ratio. M62 is 62% efficient and the TVS is 63%. Notice how the same car with different blowers in Ebristols graph is also making the same power at 3k rpm.
Of course non of this covers the volumetric efficiency of the blowers and the TVS really shines there too under high boost levels.
Last edited by Zooomer; 10-21-2009 at 02:01 PM.
10-16-2009, 07:23 PM
#191
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You just can't get off Zooomer's tip for whatever reason.
Last edited by SuperchargedSS; 10-16-2009 at 08:37 PM.
10-16-2009, 08:54 PM
#192
Senior Member
10-16-2009, 11:14 PM
#193
But now let's look at those blowers again at 3k engine rpm with the same conditions. YOu're at ~175 CFM or ~300 on the lower graph showing cubic meters. Guessing 12psi? or 1.8 on pressure ratio. M62 is 62% efficient and the TVS is 63%. Notice how the same car with different blowers in Ebristols graph is also making the same power at 3k rpm.
Blue - M62 w/ 2.7"
Red/Green - TVS w/ 2.9"
It will be nice when I can compare a 2.7" M62 vs 2.7" TVS.
10-17-2009, 01:23 PM
#194
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there is a ratio inside the blower on the gears. smaller gears, biggers gears, some gears the size of your head.
oh my!
you have yet to learn why i post the things i do sometimes.
10-17-2009, 01:50 PM
#195
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you are a hot mess, i love reading your post
you always spice things up
10-21-2009, 01:30 PM
#198
10-21-2009, 01:50 PM
#199
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I think what happens is sometimes you get called out, don't want anyone to think you're wrong, because of course everyone thinks your'e a god. So, when you do get called out, you start saying rediculous things to cover it up. Just an observation I've made over the years. There's no shame in being wrong sometimes.
