My M62 E85 car will wax the floor vs most TVS cars on gasoline...
10-08-2009, 04:26 PM
#131
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Give credit where it's due, Zooomer knows his stuff here. I found his posts very informative.
10-08-2009, 04:36 PM
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10-08-2009, 05:39 PM
#133
Rent me! per hour
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nothing more, nothing less.
10-08-2009, 07:11 PM
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10-09-2009, 08:55 PM
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I absolutely LOVE reading the posts between these two guys. It really tickles my pickle.
A knowledgeable person vs an Intelligent person. I won't divulge into which is which because that will ruin my fun, but Intelligence beats Knowledge. Every time.
A knowledgeable person vs an Intelligent person. I won't divulge into which is which because that will ruin my fun, but Intelligence beats Knowledge. Every time.
10-12-2009, 07:06 PM
#142
imagine an M62 and a TVS installed on a car with a pulley size that yeilded 100 cfm of air at 1k rpm (would be a larger pulley on the TVS). Since the belt directly ties blower rpm to engine rpm, we would say (for this discussion) that at 2k rpm each blower was putting out 200 cfm (double what it did at 1k, makes sense). At 3000 rpm both blowers put out 300 cfm and the power output of the engine is very similar. What great is that the OP did this for us:
Notice how the power output is identical up to ~3200 rpm? This is because both blowers are putting out more air exactly relative to engine rpm.
But when the M62 hits a certain boost level, it starts dropping off. Now instead of hitting 400cfm at 4000 rpm, it's doing maybe 350 while the TVS with superior ability to operate at higher boost levels is still doing the 1:1 ratio, in other words 400cfm. As the rpms go up, this difference gets worse and it's why peak torque happens lower with the M62. It's also why the M62 doesn't make as much power.
Notice how the power output is identical up to ~3200 rpm? This is because both blowers are putting out more air exactly relative to engine rpm.
But when the M62 hits a certain boost level, it starts dropping off. Now instead of hitting 400cfm at 4000 rpm, it's doing maybe 350 while the TVS with superior ability to operate at higher boost levels is still doing the 1:1 ratio, in other words 400cfm. As the rpms go up, this difference gets worse and it's why peak torque happens lower with the M62. It's also why the M62 doesn't make as much power.
Red - M62 w/ 2.7"
Blue/Green - TVS 2.9"
You can see how the boost levels off on the M62. On the TVS it keeps raising.
10-13-2009, 11:54 AM
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he's talking about the instant grunt of the m62 vs the slower but more powerful increases from the tvs. the tvs packs way more punch, but its mostly upper rpms, where, with the m62, you punch the gas and BAM!
10-13-2009, 01:42 PM
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well what if we went lower pulley size to make up for the difference?
10-13-2009, 03:07 PM
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most poeple that have gotten the tvs (myself included) have only been on the stock pulley. i watch the boost gauge make 15, 16, 17, all the way up to redline where it makes 20. when the only other difference was the m62 w/2.8" pulley, you punch the gas at pretty much any rpm and ~16ish psi was instant
10-13-2009, 03:10 PM
#150
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of course you could. but it will still ramp the boost (although much quicker) instead of making BAM! 16psi like the m62.
most poeple that have gotten the tvs (myself included) have only been on the stock pulley. i watch the boost gauge make 15, 16, 17, all the way up to redline where it makes 20. when the only other difference was the m62 w/2.8" pulley, you punch the gas at pretty much any rpm and ~16ish psi was instant
most poeple that have gotten the tvs (myself included) have only been on the stock pulley. i watch the boost gauge make 15, 16, 17, all the way up to redline where it makes 20. when the only other difference was the m62 w/2.8" pulley, you punch the gas at pretty much any rpm and ~16ish psi was instant