Effects of varying turbo AR
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Launching!
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Effects of varying turbo AR I'm looking for information on the effects of varying the AR on a Turbo.
Example of a high-rev'ing 6.0L LSx.
T76 with .86AR
vs.
T76 with 1.15AR
Post up or point me to some internet info on this.
Jay Johnson
Example of a high-rev'ing 6.0L LSx.
T76 with .86AR
vs.
T76 with 1.15AR
Post up or point me to some internet info on this.
Jay Johnson
Launching!
Joined: Feb 2007
Posts: 297
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From: Tucson
you know I have noticed that a majority folks in this forum know how to get a high horespower car, but dont have the really really technical info like your ?. I asked a similiar ? about A/R and didn't get alot of respose (aside from superman and jake@epp). anyway I personal think that
A/r has alot more to do with power than the mm of the turbine and compressor wheel. but to try to help with your ? the first turbo with a 6.0 will probaly boost early like 2000 to 2500 rpm but will choke the high rpm, this turbo will make great torque number down low, this turbo will feel awsome " by the seat of your pants" however probaly will not be the fastest in the 1/4 mile. the second turbo will boost later maybe 3500 ( this all depends on front or rear mount) but when it does boost it will not have the area resriction that the smaller a/r has and will in the 1/4 probaly be faster. you stated that the motor was a high rever if you go with the bigger turbo I think in th 1/4 youll be happer but on the street the smaller will seem more fun as boost will be alot more and earlier.
just my .02
A/r has alot more to do with power than the mm of the turbine and compressor wheel. but to try to help with your ? the first turbo with a 6.0 will probaly boost early like 2000 to 2500 rpm but will choke the high rpm, this turbo will make great torque number down low, this turbo will feel awsome " by the seat of your pants" however probaly will not be the fastest in the 1/4 mile. the second turbo will boost later maybe 3500 ( this all depends on front or rear mount) but when it does boost it will not have the area resriction that the smaller a/r has and will in the 1/4 probaly be faster. you stated that the motor was a high rever if you go with the bigger turbo I think in th 1/4 youll be happer but on the street the smaller will seem more fun as boost will be alot more and earlier.
just my .02
Originally Posted by BigJls1
you know I have noticed that a majority folks in this forum know how to get a high horespower car, but dont have the really really technical info like your ?. I asked a similiar ? about A/R and didn't get alot of respose (aside from superman and jake@epp). anyway I personal think that
A/r has alot more to do with power than the mm of the turbine and compressor wheel. but to try to help with your ? the first turbo with a 6.0 will probaly boost early like 2000 to 2500 rpm but will choke the high rpm, this turbo will make great torque number down low, this turbo will feel awsome " by the seat of your pants" however probaly will not be the fastest in the 1/4 mile. the second turbo will boost later maybe 3500 ( this all depends on front or rear mount) but when it does boost it will not have the area resriction that the smaller a/r has and will in the 1/4 probaly be faster. you stated that the motor was a high rever if you go with the bigger turbo I think in th 1/4 youll be happer but on the street the smaller will seem more fun as boost will be alot more and earlier.
just my .02
A/r has alot more to do with power than the mm of the turbine and compressor wheel. but to try to help with your ? the first turbo with a 6.0 will probaly boost early like 2000 to 2500 rpm but will choke the high rpm, this turbo will make great torque number down low, this turbo will feel awsome " by the seat of your pants" however probaly will not be the fastest in the 1/4 mile. the second turbo will boost later maybe 3500 ( this all depends on front or rear mount) but when it does boost it will not have the area resriction that the smaller a/r has and will in the 1/4 probaly be faster. you stated that the motor was a high rever if you go with the bigger turbo I think in th 1/4 youll be happer but on the street the smaller will seem more fun as boost will be alot more and earlier.
just my .02
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Originally Posted by BigJls1
anyway I personal think that
A/r has alot more to do with power than the mm of the turbine and compressor wheel.
A/r has alot more to do with power than the mm of the turbine and compressor wheel.
Mike
Originally Posted by BigJls1
dude the compressor size is the A/R
area of the compressor housing diveded by the distance to the center of the compressor wheel.
area of the compressor housing diveded by the distance to the center of the compressor wheel.
Ryan K.
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Launching!
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From: Tucson
It is true you can gain alot from a more aggesive wheel trim on the compessor side. 100 hp sound a bit much, but the a/r of the turbine ultimatly controls the boost threshold or (form when boost starts till when you basicly cant flow enuff through the housing any more) the housing the guy ?ed are obviously exhaust housing based on the sizes indicated so my respone was based on the tubine housing. also true is a more ageesive wheel in a larger housing will make big hp numbers but will take more flow to get moving ie a drag car that wants alot of boost at high rpm. Anybody that gains 100 hp from a wheel is going to give up some down low boost where as a properly flowed housing A/R will still boost early and not choke the high rpm. yes the wheel changes alot. I presonal think the housing has more to offer but will agee this could start a whole new thread, so Ill 1/2 agree with the post above me.
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Originally Posted by Ryan K
Uh, wrong end. While Compressor AR is important, it is rarely advertised. .96 & 1.15 ARs are a reference to the Turbine housing.
Ryan K.
Ryan K.
Im running a 1.10 A/R here and with 370 cubes, I feel it will be right where I want it. Anything smaller and it will become a bottle neck.
Launching!
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From: Tucson
Great link
If you notice they dont spend alot of time explaining the wheel they say some times a differnt wheel can flow more and some time not
however they spend alot of info on the effects of the a/r hhmm........
one may conclude the a/r has alot to do with turbo selection I will now shutup on this topic. Im not trying to
If you notice they dont spend alot of time explaining the wheel they say some times a differnt wheel can flow more and some time not
however they spend alot of info on the effects of the a/r hhmm........
one may conclude the a/r has alot to do with turbo selection I will now shutup on this topic. Im not trying to
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From: Westampton, NJ
i agree with bigj it all comes down to how fast you want the turbo to spool...there will also be a small difference in power (lower AR = less Hp) but i dont think were talkin a huge difference...on an 346ci or bigger id go with the bigger AR unless you want instaboost with a wider power curve...i wouldnt say that the bigger AR is gonna get better ET's every time its based off of power under the curve as well...if your doin alot of highway racing sometimes a faster spooling turbo will make the difference in a race
Originally Posted by BigJls1
Great link
If you notice they dont spend alot of time explaining the wheel they say some times a differnt wheel can flow more and some time not
however they spend alot of info on the effects of the a/r hhmm........
one may conclude the a/r has alot to do with turbo selection I will now shutup on this topic. Im not trying to
If you notice they dont spend alot of time explaining the wheel they say some times a differnt wheel can flow more and some time not
however they spend alot of info on the effects of the a/r hhmm........
one may conclude the a/r has alot to do with turbo selection I will now shutup on this topic. Im not trying to
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Joined: Jul 2005
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Originally Posted by BigJls1
It is true you can gain alot from a more aggesive wheel trim on the compessor side. 100 hp sound a bit much, but the a/r of the turbine ultimatly controls the boost threshold or (form when boost starts till when you basicly cant flow enuff through the housing any more) the housing the guy ?ed are obviously exhaust housing based on the sizes indicated so my respone was based on the tubine housing. . .
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Originally Posted by SS4Matt
very little talk is made about A/R's around here
Mike