Note: This section will be comprehensive in regard to including virtually all turbos and relating them to the rotary engine. Look significant additional content soon. i recommend you view

the comparative hot and cold wheel areas on a laptop rather than a mobile device.


(i do consult and sell turbos) 


exducer inducer trim GT say what?

as i initially approached understanding turbos things became more, not less, confusing... some referenced turbos by inducer size, some by exducer. of course they reverse when you are talking turbine wheel V compressor.

i felt there needed to be a better way of comparing turbos.

as you may know all wheels have a minor diameter size and a major diameter. they are often in inches or millimeters. i wanted something simple to help me with sizing them.

i settled on the following:

take the minor diameter and solve for the area.
take the major diameter and solve for the area.
add together, divide by two.

you now have the average area of the wheel.

do it for the compressor (coldside/intake) , do it for the turbine (hotside/exhaust).

you now have two understandable numbers that help a great deal when you seek to compare turbos. needless to say there is a major correlation between area and airflow.

the cold side area determines the airflow potential, the hotside must deliver the power to actualise the potential.

hot area V cold area is especially valuable w the rotary. the rotary places a premium on large hot V cold wheel relationships. you want something approaching 1 to 1 areawise.

EDIT NOTE: significant flow advances for newer turbos which are bolded 



here's my list in square inches:...............cold.......................h ot....................relationship

GT2860RS (Disco Potato).....................3.549................. ..3.105.................... 87%
FC T2 (OEM).........................................3.57 9....................4.288................... 119
BW EFR "6255".......discontinued..........3.79........... ...........6.758....................178
TDO5H 18G..........................................4.375 ......................3.363....................77
BW EFR "6758"....................................4.498... .................5.229....................86
BW EFR "7064"....................................4.632... .................5.229.....................88
GT3071R........................................... ....4.776....................4.019................ ... 84
GT3071R........................................... ....4.776....................3.683................ .... 77
GT2876............................................ .....5.224.....................3.108.............. ..... 59
RX6 TCW 17..........................................5.29.. .....................4.315....................82
BW K27............................................... ..5.36.......................5.06................. .....94
TO4E 57 Trim........................................5.369. ....................5.408 (Stg 5)......... 100
GT3776............................................ .....5.374.....................5.441.............. ...... 101
BW S200SX...........................................5 .40......................5.24..................... ....97
TO4E 60 Trim.........................................5.476 ....................5.408...................... 98
GT3076R........................................... .....5.511...................4.019................ ....... 73
BW S300SXE 7670..................................5.52........ ............5.27........................95
BW EFR "7670"......................................5.524. ..................5.229.......................95
GTW5857........................................... ....5.59......................4.52................ .......81 
GTX3076R.......................................... .....5.614..................4.019................. ......71.5

RX6 TCW10............................................. 5.63....................4.315..................... ..77
HKS TO4S.............................................. .5.64.....................5.89.................... ....104
Turbonetics 60-1....................................5.647........ ...........5.89....................... 104
Turbonetics T61......................................5.79..... ............... 5.89......................101
TO4B 62-1..............................................5.8 7..................... 5.89...................... 100
FD (OEM)............................................. ....5.972.................5.25.................... ..... 88
RX6 TCW 76.............................................6.0 3....................4.315......................72
Precision 6062.........................................6.27. ...................5.408......................86
RX6 TCW77............................................. .6.356..................4.315..................... .68
Borg Warner S300 60 PN177282 & 80.....6.383..................6.328............... ........99
GT3582R........................................... ........6.386..................5.171.............. ........81
HTA 3582R (Forced Performance)............ 6.386.................5.171....................... 81
GT3574 (A-Spec, Turblown TD61)..............6.386..................5.89.(P) .................92
GT3082R........................................... .........6.386.................smaller than GT35R..?
Precision 6262...........................................6.4 48..................5.408.....................84
Precision 6265........................................... 6.448.................5.885 (P)...............91
GTX3582R.......................................... .........6.519..................5.171............. .......79
BW S362 FMW (billet)................................6.53...... ...............6.35......................97
BW S300 SXE 62-76..............................6.54.............. .......6.31.....................96 (2015) PN 13009097056   my 400-500 hp value pick for 2019
BW S300 SXE 62-80..............................6.54.............. .......7.15..................109 (2015) PN 13009097053

BW EFR "8374"..........................................6. 626..................6.23....................94
BW, R85, TEC300...................................... 6.667...................6.93...................... 104
GTW6262........................................... ........6.69......................5.38............ .......80 (2015 Garrett)
GTW6265........................................... .........6.69....................5.88............. .......88 (2015 Garrett)

BW Bullseye S362.......................................6.69... .................6.31.....................94
GTX3582r GEN II........................................6.73.... ..................5.15....................76..(201 8 Garrett)
HTA 3586 (Forced Performance).................6.839................ ...5.171....................76
GTW6465........................................... ........6.84......................5.88............ ........86 (2015 Garrett)
Precision GEN2 6266..................................6.91........ .............6.........................87 (2015)

Borg W S300s 61/87(2010 catalog)...........6.946..................6.928... ..................100
Precision 6765............................................6. 997.................. 5.885 (P).............. 84
Precision 6768............................................6. 997..................6.652 (GTQ)........... 95
TO4Z, A Spec GT500 PT67...........................7.002.............. ....5.885 (P)...............87
GTX3584RS......................................... .........7.02.....................5.13............ .......73 (2016 Garrett)
BW S300 SXE 63..........................................7.06.. ..................7.15.....................101 (2015)

Borg Warner S300 63 PN177283................ 7.06....................6.31....................89
Precision GEN2 6466.....................................7.07..... ..............6.........................85 (2015)
GTW6765........................................... ............7.09....................5.88.......... .......83 (2015 Garrett)
BW EFR 8474.............................................. ..7.10....................5.91..................83 (2019)
GT3788R........................................... ........... 7.155................. 5.694...................80
GT4088R........................................... ........... 7.167................. 6.423...................90
GTX4088R.......................................................7.167.. ................6.423.................90
Borg Warner S364 FMW...............................7.17............ ........6.31....................88
BW S300 SXE 64...........................................7.17. ...................7.15...................99 (2015)

GT4088............................................ ............ 7.26.................... 6.633..................91
Precision 6766...........................................7.5 1......................6......................80 (2016)
T78............................................... ............... 7.584................... 5.903................. 78
T88 33D............................................... ........ 7.58..................... 7.577................. 100
T66............................................... ............... 7.657.................. 5.894.................77
Borg Warner S300X 9179............................ 7.691................... 5.885 (P)........... 77
BW S300 SXE 66..........................................7.74.. .....................7.15...................92 (2015)  My 2019 pick for 600 rotary rwhp at a value price. Love the small trim and big top end contact me
Borg W S300sx 66/91(2010 catalog)............7.743....................7.151 .................92
Garrett G42-1200...........................................7.7 5.....................7.52..................97 (2018)
BW EFR 9180.............................................. ....7.84....................7.189................. 92  i own and will be further testing this turbo in 2019. i may run it at Texas Mile
Borg Warner S366......................................... 7.88.....................7.15................... 91
BW S300 SXE 69...........................................7.99. ......................7.15..................89 (2015)
Precision GEN2 6870.....................................8.01..... .................6.77..................85 (2015)
Xona/Tial 6894 "XR 95-68 X3C"......................8.17.................... 6.34...................78 (2019)  i will be taking a close look at this cutting edge turbo
GT4094R........................................... ........... 8.175................... 6.423..................79
BW S300 SXE 72..........................................8.18.. ................. 7.15......................87 (2019)
BW EFR 9274.............................................. ..8.18...................7.15..................... ..87 (2019)
BW EFR 9280.............................................. ..8.36....................7.15.................... .85 (2019)

GT4294, T51R.............................................. 8.384................... 7.527..................90
Borg W K29 Billet (2010 catalog)..................8.432................... .7.175..................85
T88 34D............................................... ........ 8.449................... 7.577.................. 90
MasterPower "GT42"................................... 8.658................... 6.871................. 79
T70............................................... ................ 8.725.................. 6.648.................. 76
Borg Warner S368.........................................9.1.. ......................7.49....................77
Borg W S400sx (2010 catalog)......................9.174............... .....7.62....................83
Borg Warner S372-80.................................. 9.456................... 7.173................... 76
Borg Warner S372-83.4............................... 9.456................... 7.593................... 80
Borg Warner S372-84.................................. 9.456................... 10.298................. 109
Borg Warner S475....................................... 9.49...................... 10.292.................108
T72............................................... ................. 9.549.................. 6.648 (Q)............. 69
GT4202............................................ ............. 9.726................... 7.527.................... 77
T51R Spl............................................... ......... 9.92..................... 7.194.................... 73
Borg W K29 Billet (2010 catalog)..................8.432................... .7.175..................85
Masterpower GT45................................... 10.082..................... 8.4739.................... 84
T88 34D............................................... ........ 8.449................... 7.577.................. 90
MasterPower "GT42"................................... 8.658................... 6.871................. 79
T70............................................... ................ 8.725.................. 6.648.................. 76
Borg Warner S368.........................................9.1.. ......................7.49....................77
Borg W S400sx (2010 catalog)......................9.174............... .....7.62....................83
Borg Warner S372-80.................................. 9.456................... 7.173................... 76
Borg Warner S372-83.4............................... 9.456................... 7.593................... 80
Borg Warner S372-84.................................. 9.456................... 10.298................. 109
Borg Warner S475....................................... 9.49...................... 10.292.................108
T72............................................... ................. 9.549.................. 6.648 (Q)............. 69
GT4202............................................ ............. 9.726................... 7.527.................... 77
T51R Spl............................................... ......... 9.92..................... 7.194.................... 73
Masterpower GT45................................... 10.082..................... 8.4739.................... 84%


i also have max flow numbers in pounds per minute for each turbo that has a compressor map. take the pounds per minute, multiply by 14.471 to get CFM and divide by 1.92 to get approx max rear wheel rotary hp. or take pounds per minute, multiply by 10 and divide by 1.3 to get to the same general vicinity.

for instance... the GT3582R generates just over 60 pounds per minute between 2.3 and 2.9 pressure ratios. (19-28 psi).

so, 60 X 14.471 = 868 CFM/ 1.92 = 452 max rotary rwhp. if you will notice the compressor map at 60 pounds you will note the RPM lines are very close to vertical which means the compressor is not able to accelerate further... it is very close to stall mode. overdriven.

a turbo acts at this point as a restrictor plate ala NASCAR. no more air. so IF the compressor map is accurate that's about it. you can do the same for any of the turbos.

this thread should be read as a companion to my "Making the case for the (rotary) powered FD.. The Fix"

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/making-case-rotary-powered-fd-fix-806104/


(the essential Fix is Auxiliary Injection)  See the AI Section on this site as well as post one from the above linked thread..

 AI changes how we can fixture our cars. We can run larger turbos because alcohol and water cools the CCP.

Pick your hammer size from the list above. i like 550 as a max target as above that number the engine becomes a bit in need of some reconstruction. also, if you have ever been in a 500 hp FD you will quickly realize it is about all you can hope to hook up without different transmissions and rear driveline components. Above 550 you should also run a double disc clutch to regain comfortable driveability and clutch feather.

Some turbos can be fixtured w different hotside wheels. Most now employ billet compressor wheel which may offer additional flow per diameter due to less hub/more fins.

Trim relationships are important. High trim numbers indication the input diameter is closer to the output diameter favor top end while smaller numbers favor midrange.

Please do visit the System Design Section as to optimally incorporate your turbo.

Lots more to come soon in this Section.




TURBOCHARGER TECHNOLOGY