Over spinning a blower
Oct 26, 2018 | 08:18 PM
#1
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 82
Likes: 12
From: Southern CA
Over spinning a blower
I know enough about my supercharger to get by, but when it comes to modifying it, I don't know enough. I have a 2017 Sierra 6.2L 8-speed with a TVS1900 and a 78mm pulley. I live in CA so it's 91 octane. If I put on a grip tec 71.12mm (2.8 inch) pulley, will it be over-spinning the blower? I don't know the simple equation to figure this out, but more importantly, I don't know the threshold which I cannot exceed. Thanks for you help.
Oct 27, 2018 | 08:19 AM
#2
I found TVS 1900 efficiency charts that stop at 18,000 rpm. I couldn't find their maximum recommended rpm. The math is easy. Measure the OD of your crank pulley in inches and divide it by 2.8 (the new pulley diameter). Multiply the answer by the maximum engine rpm and that will give you the blower rpm. For example, 7.5÷2.8=2.678.
2.678x6000 engine rpm=16,071 blower rpm.
2.678x6000 engine rpm=16,071 blower rpm.
Oct 27, 2018 | 10:07 AM
#4
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 82
Likes: 12
From: Southern CA
I found TVS 1900 efficiency charts that stop at 18,000 rpm. I couldn't find their maximum recommended rpm. The math is easy. Measure the OD of your crank pulley in inches and divide it by 2.8 (the new pulley diameter). Multiply the answer by the maximum engine rpm and that will give you the blower rpm. For example, 7.5÷2.8=2.678.
2.678x6000 engine rpm=16,071 blower rpm.
2.678x6000 engine rpm=16,071 blower rpm.
Oct 27, 2018 | 02:22 PM
#7
essentially, if you're throwing more air into the engine by spinning faster, the tuner can compensate by making it a milder tune. conversely, you can have a more aggressive tune when you're spinning slower.
one thing to consider, though, is that the farther above the compressor's efficiency range you go, the more heat you're going to generate... which translates to higher IATs and faster onset of ignition timing being pulled. that is, unless you start adding bits to combat heat (more efficient heat exchanger, a/c chiller, post-blower meth, etc)
one thing to consider, though, is that the farther above the compressor's efficiency range you go, the more heat you're going to generate... which translates to higher IATs and faster onset of ignition timing being pulled. that is, unless you start adding bits to combat heat (more efficient heat exchanger, a/c chiller, post-blower meth, etc)
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Oct 27, 2018 | 08:47 PM
#8
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 82
Likes: 12
From: Southern CA
essentially, if you're throwing more air into the engine by spinning faster, the tuner can compensate by making it a milder tune. conversely, you can have a more aggressive tune when you're spinning slower.
one thing to consider, though, is that the farther above the compressor's efficiency range you go, the more heat you're going to generate... which translates to higher IATs and faster onset of ignition timing being pulled. that is, unless you start adding bits to combat heat (more efficient heat exchanger, a/c chiller, post-blower meth, etc)
one thing to consider, though, is that the farther above the compressor's efficiency range you go, the more heat you're going to generate... which translates to higher IATs and faster onset of ignition timing being pulled. that is, unless you start adding bits to combat heat (more efficient heat exchanger, a/c chiller, post-blower meth, etc)
Oct 28, 2018 | 10:15 AM
#10
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 82
Likes: 12
From: Southern CA