G40 Manual Setup
#26
Rotary Motoring
iTrader: (9)
In racing, turbo compressors wheel sizes are typically referred to by their minor diameter (the smallest diameter of the fins) as that largely dictates the maximum power the compressor can make.
Manufacturers themselves dont follow any naming rules.
Borg Warner EFR turbos are named after the major diameter of the compressor wheel followerd by the major diameter of the exhaust wheel. Example EFR 9180.
Garret GT turbos were named by the frame size/family of exhaust wheel followed by their compressor major diameter ending with an R if it was ball bearing. Example GT3582R
G series turbos use the frame size/family of exhaust wheel followed by max piston HP they recommend running on it. Example G35-900.
Manufacturers themselves dont follow any naming rules.
Borg Warner EFR turbos are named after the major diameter of the compressor wheel followerd by the major diameter of the exhaust wheel. Example EFR 9180.
Garret GT turbos were named by the frame size/family of exhaust wheel followed by their compressor major diameter ending with an R if it was ball bearing. Example GT3582R
G series turbos use the frame size/family of exhaust wheel followed by max piston HP they recommend running on it. Example G35-900.
#27
Rotary Motoring
iTrader: (9)
I'm getting confused here....explain the above like I'm a 5 year old...haha
so a G35 is a 68mm comp / 62mm turbine ...would drag racers call this a 68mm turbo?
the G40 1150 is a 71mm comp / 70mm turbine? so this is a 71mm turbo?
the G40 1150 is a 71mm comp / 70mm turbine? so this is a 71mm turbo?
#28
Racing Rotary Since 1983
iTrader: (6)
turbo nomenclature has always been confusing as been referenced above. this is partially because there hasn't been a constancy as to referencing the dimensions.
each wheel, compressor and turbine, has two different diameters. the compressor has a smaller diameter on the intake side and a larger diameter on the outflow side. the turbine also has differing diameters, also having the smaller diameter facing the inflow from the motor and the larger diameter handling the outflow.
it has not been settled as to which of the dimensions should be referenced when referring to a particular turbo and this has caused lots of initial confusion. lousy marketing. i had a lengthy discussion w Dan Sussna, at the time CEO of Garrett, about this. IMO a need to simplify nomenclature so the market could sort thru all the GT3582 morass.
Garrett got it done w the group tag, say G40, and then the flow, say 1150. the market, which is of course piston, knows you take the 1150 and divide it by ten to get max power. easy. Borg Warner hasn't yet put on it's marketing hat. EFR8374 huh?
attempting to find an understandable means of comparison i have taken the diameter of each wheel, solved for the area. since there is a smaller and larger diameter on each wheel i add them and divide by two. we now have an average area for each wheel.
while other factors enter, such as wheel height and shape, these numbers provide a worthwhile starting point to compare turbo options.
while size matters, another often overlooked factor is Trim. trim is expressed as, a number such as 54 or 64. it is the relationship between the areas of the inflow diameter to the outflow. if trim is in the low 50s the wheel favors early spool. if it is the 60s it favors top end.
for all the turbos numbers see my thread: Turbo Comparisons
https://www.rx7club.com/single-turbo...st-one-869614/
each wheel, compressor and turbine, has two different diameters. the compressor has a smaller diameter on the intake side and a larger diameter on the outflow side. the turbine also has differing diameters, also having the smaller diameter facing the inflow from the motor and the larger diameter handling the outflow.
it has not been settled as to which of the dimensions should be referenced when referring to a particular turbo and this has caused lots of initial confusion. lousy marketing. i had a lengthy discussion w Dan Sussna, at the time CEO of Garrett, about this. IMO a need to simplify nomenclature so the market could sort thru all the GT3582 morass.
Garrett got it done w the group tag, say G40, and then the flow, say 1150. the market, which is of course piston, knows you take the 1150 and divide it by ten to get max power. easy. Borg Warner hasn't yet put on it's marketing hat. EFR8374 huh?
attempting to find an understandable means of comparison i have taken the diameter of each wheel, solved for the area. since there is a smaller and larger diameter on each wheel i add them and divide by two. we now have an average area for each wheel.
while other factors enter, such as wheel height and shape, these numbers provide a worthwhile starting point to compare turbo options.
while size matters, another often overlooked factor is Trim. trim is expressed as, a number such as 54 or 64. it is the relationship between the areas of the inflow diameter to the outflow. if trim is in the low 50s the wheel favors early spool. if it is the 60s it favors top end.
for all the turbos numbers see my thread: Turbo Comparisons
https://www.rx7club.com/single-turbo...st-one-869614/
#30
Senior Member
Join Date: Jun 2010
Location: U.K - Instagram - copyninja_fd
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turbo nomenclature has always been confusing as been referenced above. this is partially because there hasn't been a constancy as to referencing the dimensions.
each wheel, compressor and turbine, has two different diameters. the compressor has a smaller diameter on the intake side and a larger diameter on the outflow side. the turbine also has differing diameters, also having the smaller diameter facing the inflow from the motor and the larger diameter handling the outflow.
it has not been settled as to which of the dimensions should be referenced when referring to a particular turbo and this has caused lots of initial confusion. lousy marketing. i had a lengthy discussion w Dan Sussna, at the time CEO of Garrett, about this. IMO a need to simplify nomenclature so the market could sort thru all the GT3582 morass.
Garrett got it done w the group tag, say G40, and then the flow, say 1150. the market, which is of course piston, knows you take the 1150 and divide it by ten to get max power. easy. Borg Warner hasn't yet put on it's marketing hat. EFR8374 huh?
attempting to find an understandable means of comparison i have taken the diameter of each wheel, solved for the area. since there is a smaller and larger diameter on each wheel i add them and divide by two. we now have an average area for each wheel.
while other factors enter, such as wheel height and shape, these numbers provide a worthwhile starting point to compare turbo options.
while size matters, another often overlooked factor is Trim. trim is expressed as, a number such as 54 or 64. it is the relationship between the areas of the inflow diameter to the outflow. if trim is in the low 50s the wheel favors early spool. if it is the 60s it favors top end.
for all the turbos numbers see my thread: Turbo Comparisons
https://www.rx7club.com/single-turbo...st-one-869614/
each wheel, compressor and turbine, has two different diameters. the compressor has a smaller diameter on the intake side and a larger diameter on the outflow side. the turbine also has differing diameters, also having the smaller diameter facing the inflow from the motor and the larger diameter handling the outflow.
it has not been settled as to which of the dimensions should be referenced when referring to a particular turbo and this has caused lots of initial confusion. lousy marketing. i had a lengthy discussion w Dan Sussna, at the time CEO of Garrett, about this. IMO a need to simplify nomenclature so the market could sort thru all the GT3582 morass.
Garrett got it done w the group tag, say G40, and then the flow, say 1150. the market, which is of course piston, knows you take the 1150 and divide it by ten to get max power. easy. Borg Warner hasn't yet put on it's marketing hat. EFR8374 huh?
attempting to find an understandable means of comparison i have taken the diameter of each wheel, solved for the area. since there is a smaller and larger diameter on each wheel i add them and divide by two. we now have an average area for each wheel.
while other factors enter, such as wheel height and shape, these numbers provide a worthwhile starting point to compare turbo options.
while size matters, another often overlooked factor is Trim. trim is expressed as, a number such as 54 or 64. it is the relationship between the areas of the inflow diameter to the outflow. if trim is in the low 50s the wheel favors early spool. if it is the 60s it favors top end.
for all the turbos numbers see my thread: Turbo Comparisons
https://www.rx7club.com/single-turbo...st-one-869614/
I should have clarified earlier, I do like how precision turbos address their turbo sizing which makes complex turbo nomenclature clear for a turbo noob like me. Correct me if I'm wrong here but the 6870, means they are referring to the compressor as 68mm and the turbine is 70mm? That's what I was trying to get at earlier but got confusing real quick as you've mentioned above as the compressor & turbine have two sizes.
#31
Arrogant Wankeler
Thanks Howard, I've found your turbo thread very helpful to compare the compressor and turbine side.
I should have clarified earlier, I do like how precision turbos address their turbo sizing which makes complex turbo nomenclature clear for a turbo noob like me. Correct me if I'm wrong here but the 6870, means they are referring to the compressor as 68mm and the turbine is 70mm? That's what I was trying to get at earlier but got confusing real quick as you've mentioned above as the compressor & turbine have two sizes.
I should have clarified earlier, I do like how precision turbos address their turbo sizing which makes complex turbo nomenclature clear for a turbo noob like me. Correct me if I'm wrong here but the 6870, means they are referring to the compressor as 68mm and the turbine is 70mm? That's what I was trying to get at earlier but got confusing real quick as you've mentioned above as the compressor & turbine have two sizes.
Physical packaging is a bit different, frame size kind of gets there but it's not like any of them are based on a square or I guess golden ratio w/l box in inches which might be beneficial.
Last edited by Slides; 05-30-23 at 12:41 AM.
#32
Junior Member
Thread Starter
Will keep you updated on the progress.
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rx7srbad (06-01-23)
#33
10000 RPM Lane
iTrader: (2)
it’s a safe choice if your engine configuration is similar, but honestly there’s so much incorrect or bad information in this thread it’s a miracle anyone asking the question can figure anything out
his result posted at the beginning of the thread is closer to 725 - 750 whp here on USA dynos. Which is not really a fair comparison to make against the G42-1450 it was paired with on the dyno sheet. That’s a 850 - 1000 whp range compressor on a rotary engine with the appropriate turbine housing choice. The G42-1200 or -1200C might have fared better.
He likely also mistakenly stated 1.06 A/R as well since moving past face value of the posting, there isn’t one offered anywhere for a G42 that I can find. It most likely was the 1.01 A/R (1.15 & 1.28 are the others offered) which would put it about equal on turbine flow potential to the G40 1.19 AR.
So the appropriate comparison or consideration would be the G40-1150 1.19 vs the G42-1200 1.01.
.
his result posted at the beginning of the thread is closer to 725 - 750 whp here on USA dynos. Which is not really a fair comparison to make against the G42-1450 it was paired with on the dyno sheet. That’s a 850 - 1000 whp range compressor on a rotary engine with the appropriate turbine housing choice. The G42-1200 or -1200C might have fared better.
He likely also mistakenly stated 1.06 A/R as well since moving past face value of the posting, there isn’t one offered anywhere for a G42 that I can find. It most likely was the 1.01 A/R (1.15 & 1.28 are the others offered) which would put it about equal on turbine flow potential to the G40 1.19 AR.
So the appropriate comparison or consideration would be the G40-1150 1.19 vs the G42-1200 1.01.
.
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rx7srbad (06-20-23)
#35
Junior Member
Thread Starter
Who knew it would be so hard to find a workshop in Sydney to do the work though!
If anyone has any Rotary specialists in Sydney they can recommend that'd be great.
If anyone has any Rotary specialists in Sydney they can recommend that'd be great.
#36
So what would you guys recommend for a halfbridged engine with bigger exhaust ports aiming for 500-550 hp? using it for the track (grip) mostly. was thinking about g40 or g42 compact but can't decide on the trims
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