Blow off valve on CVT
#1
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Blow off valve on CVT
I just have a quick question. If you have a CVT tranny and you get a turbo, is a BOV needed? From my understanding, a BOV is only used in between gear shifts to release air to reset itself, but since the cvt never shifts gears (unless your using sports mode) that means the turbo could keep spinning right? But what if your using sports mode, how will you engage the BOV when you shift since its not really shifting, just a different tension in the cvt belt? (sorry if this doesnt make since, i only have a basic understanding of turbos)
Lol title is missing an F.
Lol title is missing an F.
Last edited by Bladed; Jan 2, 2008 at 03:36 PM.
#3
thanx for explaining that, it kinda had me baffled to. so will the continuous use being on the cvt tranny couse the turbo to ware faster or dammage the turbine??? or am i just thinking to hard
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Yes, I'm 99% sure that it has a throttle plate.
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no I think your still not fully getting it, there really is no gears at all, the transmission is run by two pulleys that have the ability to shift in sizes. These changes in sizes are what gives you an unlimited range of gear ratios. Mitsu Development team has choosing certain 6 Gear ratios.
Lets take a look, below are the 5 speed MANUAL transmission and following behind it are the CVT Ratios,
5 speed gear ratios
1 3.538
2 1.913
3 1.333
4 1.028
5 0.820
Final Drive
4.235
CVT Sportronic Ratios
1 2.349
2 1.397
3 1.074
4 0.832
5 0.631
6 0.518
Final Drive
6.120
Now remember since they are arbitrarly selected ratios, in theory if i didnt like gear ratio number 6 i could change it to .49 or .55 If i wanted to i could copy the 5 speed ratios if i wanted to. Of course i would need a CVT ECU override controller to do so. but in theory anything is possible for the CVT.
Getting backto its operation, the shifts on the CVT happen almost instantly, and even in that fraction of a moment of flux, the throttle of the engine remains at 100%. Its beautiful
Lets take a look, below are the 5 speed MANUAL transmission and following behind it are the CVT Ratios,
5 speed gear ratios
1 3.538
2 1.913
3 1.333
4 1.028
5 0.820
Final Drive
4.235
CVT Sportronic Ratios
1 2.349
2 1.397
3 1.074
4 0.832
5 0.631
6 0.518
Final Drive
6.120
Now remember since they are arbitrarly selected ratios, in theory if i didnt like gear ratio number 6 i could change it to .49 or .55 If i wanted to i could copy the 5 speed ratios if i wanted to. Of course i would need a CVT ECU override controller to do so. but in theory anything is possible for the CVT.
Getting backto its operation, the shifts on the CVT happen almost instantly, and even in that fraction of a moment of flux, the throttle of the engine remains at 100%. Its beautiful
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ok but you would still need a bov, am i right or wrong? i understand how cvt works, i just didnt feel like going into detail, but what im sayin is under normal driving you wouldnt floor it and when you let off the gas it would release the built up boost from the rpms?
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ok but you would still need a bov, am i right or wrong? i understand how cvt works, i just didnt feel like going into detail, but what im sayin is under normal driving you wouldnt floor it and when you let off the gas it would release the built up boost from the rpms?