Turbo Spec Comparison Table

[downforce22]

This is a resource that I think is pretty helpful for people looking for information on what turbo size people have used on their application and how it may relate to a similar turbo. I found this originally posted on NASIOC forum and wanted a link incase that went down for some reason. I also did some hunting and found specifications for Holset turbos. There are so many it is tough to know what is right, but this information should get you pretty close if you are looking at a holset.

Original post quoted from here with some information taken from here and here for the holset info.

Turbo Spec Comparison Table (Wheel Sizes, Max Airflow, Bearings, Etc.)



This list has been created to help compare turbo's more easily. As I looked at different turbo options it became clear that it was not a straightforward task, mainly due to inconsistent methods of listing turbo specifications by different manufacturers. Because of this it was difficult to even compare the physical wheel sizes of different turbo's.

I began compiling the information that I could find by looking online and in the product catalog's of various manufacturers. Along the way I asked manitou for help and he did a lot of the work calling around to try and fill in the blanks that I could not easily find, and also adding info for other brands and models. Thanks to him we have a pretty good list together at this time.

We chose common turbo's on the Subaru platform. Both stock location and rotated turbo's are included.We decided to keep this table as simple as possible and only include some of the most basic specifications. This includes the inducer and exducer measurements for both the compressor and turbine, and also the max flow rate of the turbo.

This post is NOT meant to be a lesson on turbo basics. If you need that there are many resources on this site and elsewhere online. Here are a few links to get you started.

http://forums.nasioc.com/forums/show....php?t=1218459

http://www.turbobygarrett.com/turbob...rbo_tech_basic

http://www.turbobygarrett.com/turbob..._tech_advanced

http://www.turbobygarrett.com/turbob...bo_tech_expert

Here is the list that we have compiled so far. Please let me know if there are any errors. All of this information should have come straight from the manufacturer, but there could still be errors, and I would be happy to correct any that are found. We are open to suggestions for more turbo's to be added to the list. If you have the specifications available that would make it much easier to get it added.

CmpInd	Compressor Inducer [mm]
CmpExd	Compressor Exducer [mm]
TrbInd	Turbine Inducer [mm]
TrbExd	Turbine Exducer [mm]
Flow	Max Air Flow Rate [lb/min]

Brand		Turbo		CmpInd	CmpExd	TrbInd	TrbExd	Flow	CHRA Bearings	Mounting
Blouch		16G XT		48.30	64.30	55.50	49.00	41.0	Journal Bearing	Stock
Blouch		18G XT		49.80	68.00	55.50	49.00	43.0	Journal Bearing	Stock
Blouch		20G XT		52.00	68.00	63.00	54.00	47.0	Journal Bearing	Stock
Blouch		16G XT-R	48.30	64.30	54.00	49.40	38.0	Ball Bearing	Stock
Blouch		18G XT-R	49.80	68.00	56.50	51.70	43.0	Ball Bearing	Stock
Blouch		20G XT-R	52.00	68.00	56.50	51.70	47.0	Ball Bearing	Stock
Blouch		Dom 1.5 XT-R	53.00	71.00	56.50	51.70	49.0	Ball Bearing	Stock
Blouch		Dom 2.5 XT-R	53.00	71.00	60.00	54.90	49.0	Ball Bearing	Stock
Blouch		Dom 3.0 XT-R	57.00	76.00	60.00	54.90	55.0	Ball Bearing	Stock
Blouch		Dom 3.5 XT-R	57.00	76.00	64.00	58.60	58.0	Ball Bearing	Stock
Blouch		Dom 4.0 XT-R	60.00	82.00	64.00	58.60	60.0	Ball Bearing	Stock
Blouch		Dom 5.0 XT-R	62.00	84.00	68.00	62.20	65.0	Ball Bearing	Stock
BorgWarner	BW 7670-S256	56.00	76.00	70.00	61.00	58.0	Journal Bearing	Rotated
BorgWarner	BW 8375-S360	60.00	83.00	75.90	68.00	68.0	Journal Bearing	Rotated
BorgWarner	BW 8875-S363	63.00	88.00	75.90	68.00	75.0	Journal Bearing	Rotated
BorgWarner	BW 9180-S366	66.00	91.00	80.00	73.00	82.0	Journal Bearing	Rotated
BorgWarner	S251SX		51.00	70.00	70.00	61.00	50??	Journal Bearing
BorgWarner	S252SXE		52.17	69.50	70.00	61.00	55.0	Journal Bearing
BorgWarner	S257SXE		57.15	76.20	70.00	61.00	65.0	Journal Bearing
BorgWarner	S262SXE		61.44	83.47	76.00	68.00	76.0	Journal Bearing
BorgWarner	S363SXE		62.99	87.37	76.00	68.00	78.0	Journal Bearing
BorgWarner	S363SXE		62.99	87.37	80.00	73.00	78.0	Journal Bearing
BorgWarner	S364.5SXE	64.50	87.37	76.00	68.00	80.0	Journal Bearing
BorgWarner	S364.5SXE	64.50	87.37	80.00	73.00	80.0	Journal Bearing
BorgWarner	S366SXE		66.11	91.44	80.00	73.00	87.0	Journal Bearing
BorgWarner	S369SXE		69.00	91.44	80.00	73.00	95.0	Journal Bearing
BorgWarner	EFR 6258	49.60	62.00	58.00	51.00	44.0	Ball Bearing	Rotated
BorgWarner	EFR 6758	53.90	67.00	58.00	51.00	49.0	Ball Bearing	Rotated
BorgWarner	EFR 7064	52.20	70.00	64.00	56.00	56.0	Ball Bearing	Rotated
BorgWarner	EFR 7163	57.00	71.00	63.00	N/A	60.0	Ball Bearing	Rotated
BorgWarner	EFR 7670	57.20	76.00	70.00	62.00	64.0	Ball Bearing	Rotated
BorgWarner	EFR 8374	62.60	83.00	74.00	64.00	79.0	Ball Bearing	Rotated
BorgWarner	EFR 9180	67.70	91.00	80.00	74.00	94.0	Ball Bearing	Rotated
Forced Perf	FP 68HTA		68.00	65.00		47.0	Journal Bearing	Stock
Forced Perf	FP 71HTA	51.20	71.00	65.00	55.00	51.0	Journal Bearing	Stock
Forced Perf	FP Green HTA	54.80	76.00	67.00	59.00	59.0	Journal Bearing	Stock
Forced Perf	FP Red 		61.21	81.79	67.00	59.00	65.0	Journal Bearing	Stock
Forced Perf	FP Red 76HTA	58.00	76.00	60.00	54.90	60.0	Ball Bearing	Stock
Forced Perf	FP Black HTA	59.10	82.00	67.30	58.80	68.0	Journal Bearing	Stock
Forced Perf	FP Black 82HTA	62.00	82.00	68.00	62.23	68.0	Ball Bearing	Stock
Forced Perf	FP HTA 3076R	54.80	76.00	60.00	54.90	59.0	Ball Bearing	Rotated
Forced Perf	FP HTA 3582R	62.00	82.00	68.00	62.20	68.0	Ball Bearing	Rotated
Forced Perf	FP HTA 3586R	62.10	86.20	68.00	62.20	75.0	Ball Bearing	Rotated
Forced Perf	FP HTA 3786R	62.10	86.20	72.50	66.50	78.0	Ball Bearing	Rotated
Forced Perf	FP HTA 3794R	67.50	94.00	72.50	66.50	93.0	Ball Bearing	Rotated
Forced Perf	FP HTA 4294R	67.70	94.00	82.00	77.00	96.0	Ball Bearing	Rotated
Forced Perf	6466TZ		64.00	88.00	72.60	66.30	92.5	Ball Bearing	Rotated
Forced Perf	HTZ Super 94	67.70	94.00	76.00	67.00	95.0	Ball Bearing	Rotated
Forced Perf	HTZ Super 99	72.00	99.00	76.00	67.00	103.0	Ball Bearing	Rotated
Garrett		GT 2871R	51.20	71.00	54.00	49.40	46.0	Journal		Both
Garrett		GT 3071R	53.10	71.00	60.00	54.90	46.0	Journal		Both
Garrett		GT 3076R	57.00	76.20	60.00	54.90	52.5	Journal		Both
Garrett		GT 3582R	61.40	82.00	68.00	62.20	60.0	Journal		Both
Garrett		GT 4088R	63.50	88.00	77.00	70.40	67.5	Journal		Both
Garrett		GT 4294R	70.30	94.00	82.00	77.00	85.0	Journal		Both
Garrett		GTX 3071R	54.10	71.40	60.00	54.90	56.0	Ball Bearing	Both
Garrett		GTX 3076R	58.00	76.60	60.00	54.90	64.0	Ball Bearing	Both
Garrett		GTX 3576R	58.00	76.60	68.00	62.20	65.0	Ball Bearing	Both
Garrett		GTX 3582R	62.50	82.50	68.00	62.20	75.0	Ball Bearing	Both
Garrett		GTX 4294R	70.30	94.00	82.00	77.00	95.0	Ball Bearing	Both
Holset		HX30 - 6cm	44.00	73.00	65.50	52.00	44.0	Journal
Holset		HX35 - 7 blade	54.00	78.00	70.00	58.00	58.0	Journal	
Holset		HX35 - 8 blade	56.00	83.00	70.00	58.00	52.0	Journal		
Holset		HY35 - 7 blade	54.00	78.00	65.00	58.00	58.0	Journal		
Holset		HX35/40 Hybrid	60.00	86.00	70.00	58.00	60.0	Journal
Holset		HE351CW	9cm	60.00	82.00	68.00	60.00	67.0	Journal
Holset		H1C - 8 blade	56.00	83.00	70.00	60.00	52.0	Journal
Holset		HX40 - 8 blade	60.00	83.00	76.00	65.00	62.0	Journal
Holset		HX40 - 7 blade	60.00	86.00	76.00	65.00	62.0	Journal
Holset		HX40 - 6 blade	56.00	86.00	76.00	65.00	60.0	Journal
IHI		VF39/48/52	46.50	60.00	52.80	47.88	34.0	Journal Bearing	Stock
MHI		TD04L 13T-6	40.70	56.00	47.00	41.30	26.7	Journal Bearing	Stock
MHI		TD05H 16G	48.30	68.00	56.00	49.10	37.9	Journal Bearing	Stock
MHI		TD05H 18G	50.50	68.00	56.00	49.10	43.7	Journal Bearing	Stock
MHI		TD05H 20G	52.50	68.00	56.00	49.10	47.4	Journal Bearing	Stock
MHI		TD06SL2 20G	52.50	68.00	61.00	54.00	47.4	Journal Bearing	Stock
MHI		TD06H 20G	52.50	68.00	67.00	58.80	47.4	Journal Bearing	Stock
MHI		TD06H 60-1	59.50	76.00	67.00	58.80	61.0	Journal Bearing	Stock
Precision	Subaru 5530	54.90	76.20	56.50	51.78	52.5	Ball Bearing	Stock
Precision	PTE 5558	54.90	76.20	64.90	57.91	59.0	Either		Rotated
Precision	PTE 5858	58.00	76.20	64.90	57.91	62.0	Either		Rotated
Precision	PTE 5862	58.00	76.20	71.00	61.90	64.0	Either		Rotated
Precision	PTE 6262	62.23	81.99	71.00	61.90	70.5	Either		Rotated
Precision	PTE 6266	62.00	81.99	74.17	66.00	73.5	Either		Rotated
Precision	PTE 6266 G2	62.00	81.99	74.17	66.00	80.0	Ball Bearing	Rotated
Precision	PTE 6466 G2	64.39	86.61	74.17	66.00	90.0	Ball Bearing	Rotated
Precision	PTE 6766	67.44	88.32	74.17	66.00	93.5	Either		Rotated
Precision	PTE 6870 G2	68.02	92.46	78.74	70.21	110.0	Ball Bearing	Rotated
Precision	PTE 7175	70.99	93.98	82.00	75.08	98.5	Either		Rotated
Precision	PTE 7275	72.40	91.00	82.00	75.08	101.5	Either		Rotated
Steam		STX 67		49.70	67.40	55.80	49.10	48.0	Journal Bearing	Stock
Steam		STX 71		54.10	71.40	61.00	54.10	59.0	Journal Bearing	Stock
Steam		STX 20G-R	52.50	68.00	60.00	54.90	47.4	Ball Bearing

And sorted by flow

Brand		Turbo		CmpInd	CmpExd	TrbInd	TrbExd	Flow	CHRA Bearings	Mounting
MHI		TD04L 13T-6	40.7	56	47	41.3	26.7	Journal Bearing	Stock
IHI		VF39/48/52	46.5	60	52.8	47.88	34	Journal Bearing	Stock
MHI		TD05H 16G	48.3	68	56	49.1	37.9	Journal Bearing	Stock
Blouch	        16G XT-R	48.3	64.3	54	49.4	38	Ball Bearing	Stock
Blouch		16G XT	          48.3	64.3	55.5	49	41	Journal Bearing	Stock
Blouch		18G XT	          49.8	68	55.5	49	43	Journal Bearing	Stock
Blouch		18G XT-R	49.8	68	56.5	51.7	43	Ball Bearing	Stock
MHI		TD05H 18G	50.5	68	56	49.1	43.7	Journal Bearing	Stock
BorgWarner	EFR 6258	49.6	62	58	51	44	Ball Bearing	Rotated
Holset		HX30 - 6cm	44	73	65.5	52	44	Journal	
Garrett		GT 2871R	51.2	71	54	49.4	46	Journal		Both
Garrett		GT 3071R	53.1	71	60	54.9	46	Journal		Both
Blouch		20G XT		52	68	63	54	47	Journal Bearing	Stock
Blouch		20G XT-R	52	68	56.5	51.7	47	Ball Bearing	Stock
Forced Perf	FP 68HTA		68	65		47	Journal Bearing	Stock
MHI		TD05H 20G	52.5	68	56	49.1	47.4	Journal Bearing	Stock
MHI		TD06SL2 20G	52.5	68	61	54	47.4	Journal Bearing	Stock
MHI		TD06H 20G	52.5	68	67	58.8	47.4	Journal Bearing	Stock
Steam		STX 20G-R	52.5	68	60	54.9	47.4	Ball Bearing	
Steam		STX 67		49.7	67.4	55.8	49.1	48	Journal Bearing	Stock
Blouch		Dom 1.5 XT-R	53	71	56.5	51.7	49	Ball Bearing	Stock
Blouch		Dom 2.5 XT-R	53	71	60	54.9	49	Ball Bearing	Stock
BorgWarner	EFR 6758	53.9	67	58	51	49	Ball Bearing	Rotated
BorgWarner	S251SX		51.00	70.00	70.00	61.00	50??	Journal Bearing
Forced Perf	FP 71HTA	51.2	71	65	55	51	Journal Bearing	Stock
Holset		HX35 - 8 blade	56	83	70	58	52	Journal	
Holset		H1C - 8 blade	56	83	70	60	52	Journal	
Garrett		GT 3076R	57	76.2	60	54.9	52.5	Journal		Both
Precision	Subaru 5530	54.9	76.2	56.5	51.78	52.5	Ball Bearing	Stock
Blouch		Dom 3.0 XT-R	57	76	60	54.9	55	Ball Bearing	Stock
BorgWarner	S252SXE		52.17	69.50	70.00	61.00	55	Journal Bearing
BorgWarner	EFR 7064	52.2	70	64	56	56	Ball Bearing	Rotated
Garrett		GTX 3071R	54.1	71.4	60	54.9	56	Ball Bearing	Both
Blouch		Dom 3.5 XT-R	57	76	64	58.6	58	Ball Bearing	Stock
BorgWarner	BW 7670-S256	56	76	70	61	58	Journal Bearing	Rotated
Holset		HX35 - 7 blade	54	78	70	58	58	Journal	
Holset		HY35 - 7 blade	54	78	65	58	58	Journal	
Forced Perf	FP Green HTA	54.8	76	67	59	59	Journal Bearing	Stock
Forced Perf	FP HTA 3076R	54.8	76	60	54.9	59	Ball Bearing	Rotated
Precision	PTE 5558	54.9	76.2	64.9	57.91	59	Either	Rotated
Steam		STX 71		54.1	71.4	61	54.1	59	Journal Bearing	Stock
Blouch		Dom 4.0 XT-R	60	82	64	58.6	60	Ball Bearing	Stock
BorgWarner	EFR 7163	57	71	63	N/A	60	Ball Bearing	Rotated
Forced Perf	FP Red 76HTA	58	76	60	54.9	60	Ball Bearing	Stock
Garrett		GT 3582R	61.4	82	68	62.2	60	Journal		Both
Holset		HX35/40 Hybrid	60	86	70	58	60	Journal	
Holset		HX40 - 6 blade	56	86	76	65	60	Journal	
MHI		TD06H 60-1	59.5	76	67	58.8	61	Journal Bearing	Stock
Holset		HX40 - 8 blade	60	83	76	65	62	Journal	
Holset		HX40 - 7 blade	60	86	76	65	62	Journal
BorgWarner	S257SXE		57.15	76.20	70.00	61.00	65.0	Journal Bearing	
Precision	PTE 5858	58	76.2	64.9	57.91	62	Either	Rotated
BorgWarner	EFR 7670	57.2	76	70	62	64	Ball Bearing	Rotated
Garrett		GTX 3076R	58	76.6	60	54.9	64	Ball Bearing	Both
Precision	PTE 5862	58	76.2	71	61.9	64	Either	Rotated
Blouch		Dom 5.0 XT-R	62	84	68	62.2	65	Ball Bearing	Stock
Forced Perf	FP Red 		61.21	81.79	67	59	65	Journal Bearing	Stock
Garrett		GTX 3576R	58	76.6	68	62.2	65	Ball Bearing	Both
BorgWarner	S257SXE		57.15	76.20	70.00	61.00	65.0	Journal Bearing
Holset		HE351CW-9cm	60	82	68	60	67	Journal	
Garrett		GT 4088R	63.5	88	77	70.4	67.5	Journal		Both
BorgWarner	BW 8375-S360	60	83	75.9	68	68	Journal Bearing	Rotated
Forced Perf	FP Black HTA	59.1	82	67.3	58.8	68	Journal Bearing	Stock
Forced Perf	FP Black 82HTA	62	82	68	62.23	68	Ball Bearing	Stock
Forced Perf	FP HTA 3582R	62	82	68	62.2	68	Ball Bearing	Rotated
Precision	PTE 6262	62.23	81.99	71	61.9	70.5	Either	Rotated
Precision	PTE 6266	62	81.99	74.17	66	73.5	Either	Rotated
BorgWarner	BW 8875-S363	63	88	75.9	68	75	Journal Bearing	Rotated
Forced Perf	FP HTA 3586R	62.1	86.2	68	62.2	75	Ball Bearing	Rotated
Garrett		GTX 3582R	62.5	82.5	68	62.2	75	Ball Bearing	Both
BorgWarner	S262SXE		61.44	83.47	76.00	68.00	76.0	Journal Bearing
Forced Perf	FP HTA 3786R	62.1	86.2	72.5	66.5	78	Ball Bearing	Rotated
BorgWarner	S363SXE		62.99	87.37	76.00	68.00	78.0	Journal Bearing
BorgWarner	S363SXE		62.99	87.37	80.00	73.00	78.0	Journal Bearing
BorgWarner	EFR 8374	62.6	83	74	64	79	Ball Bearing	Rotated
Precision	PTE 6266 G2	62	81.99	74.17	66	80	Ball Bearing	Rotated
BorgWarner	S364.5SXE	64.50	87.37	76.00	68.00	80.0	Journal Bearing
BorgWarner	S364.5SXE	64.50	87.37	80.00	73.00	80.0	Journal Bearing
BorgWarner	BW 9180-S366	66	91	80	73	82	Journal Bearing	Rotated
Garrett		GT 4294R	70.3	94	82	77	85	Journal		Both
BorgWarner	S366SXE		66.11	91.44	80.00	73.00	87.0	Journal Bearing
Precision	PTE 6466 G2	64.39	86.61	74.17	66	90	Ball Bearing	Rotated
Forced Perf	6466TZ		64	88	72.6	66.3	92.5	Ball Bearing	Rotated
Forced Perf	FP HTA 3794R	67.5	94	72.5	66.5	93	Ball Bearing	Rotated
Precision	PTE 6766	67.44	88.32	74.17	66	93.5	Either	Rotated
BorgWarner	EFR 9180	67.7	91	80	74	94	Ball Bearing	Rotated
Forced Perf	HTZ Super 94	67.7	94	76	67	95	Ball Bearing	Rotated
Garrett		GTX 4294R	70.3	94	82	77	95	Ball Bearing	Both
BorgWarner	S369SXE		69.00	91.44	80.00	73.00	95	Journal Bearing
Forced Perf	FP HTA 4294R	67.7	94	82	77	96	Ball Bearing	Rotated
Precision	PTE 7175	70.99	93.98	82	75.08	98.5	Either	Rotated
Precision	PTE 7275	72.4	91	82	75.08	101.5	Either	Rotated
Forced Perf	HTZ Super 99	72	99	76	67	103	Ball Bearing	Rotated
Precision	PTE 6870 G2	68.02	92.46	78.74	70.21	110	Ball Bearing	Rotated

[Northern]

I'm too lazy to help, but that list is missing some newer stuff, like PT6062(and probably whatever else came out when that did) as well as a lot of the Borg AirWerks stuff (S200/S300 probably most applicable. I see a few but the "BW ####" numbering scheme doesn't seem as popular as "s###" or "s###sx" etc.) most of which are good M20/m5x sizes. I'll try to find some time to gather some of this later.

[Northern]

After looking at this more closely, The entire Borg Warner Airwerks SXE line seems to be missing.

If we want to switch the Airwerks BW stuff over to more common names, here's what they convert to (could drop the sx/sxe off the end to shorten the name)
Borg Warner 7670 - S256sx
Borg Warner 8375 - S360sx
Borg Warner 8875 - S363sx
Borg Warner 9180 - S366sx


Other stuff. Mostly new(er) SXE line (Billet wheel, 360deg thrust bearing, compressor speed sensor port) Only caring about S200/S300, since they seem to be of appropriate size. (These are all JB)

Turbo     CmpInd      CmpExd      TrbInd     TrbExd    Flow 
----------------------------------------------------------------------------
S251sx     51          70          70         61        ??
S252sxe    52.17       69.50       70.00      61.00     55
S257sxe    57.15       76.20       70.00      61.00     65
S362sxe    61.44       83.47       76.00      68.00     76
S363sxe    62.99       87.37       76.00      68.00     78
S363sxe    62.99       87.37       80.00      73.00     78
S364.5sxe  64.50       87.37       76.00      68.00     80
S364.5sxe  64.50       87.37       80.00      73.00     80
S366sxe    66.11       91.44       80.00      73.00     87
S369sxe    69.00       91.44       80.00      73.00     95

Random nitpicks:
The table sorted by flow seems to be misaligned.
All the Holsets are journal bearing
All the Garret GT(non-GTX) are journal bearing
I think 50%+ of the ball bearing listings on there aren't ball bearing.

[downforce22]

After looking at this more closely, The entire Borg Warner Airwerks SXE line seems to be missing.

If we want to switch the Airwerks BW stuff over to more common names, here's what they convert to (could drop the sx/sxe off the end to shorten the name)
Borg Warner 7670 - S256sx
Borg Warner 8375 - S360sx
Borg Warner 8875 - S363sx
Borg Warner 9180 - S366sx


Other stuff. Mostly new(er) SXE line (Billet wheel, 360deg thrust bearing, compressor speed sensor port) Only caring about S200/S300, since they seem to be of appropriate size. (These are all JB)

Turbo     CmpInd      CmpExd      TrbInd     TrbExd    Flow 
----------------------------------------------------------------------------
S251sx     51          70          70         61        ??
S252sxe    52.17       69.50       70.00      61.00     55
S257sxe    57.15       76.20       70.00      61.00     65
S362sxe    61.44       83.47       76.00      68.00     76
S363sxe    62.99       87.37       76.00      68.00     78
S363sxe    62.99       87.37       80.00      73.00     78
S364.5sxe  64.50       87.37       76.00      68.00     80
S364.5sxe  64.50       87.37       80.00      73.00     80
S366sxe    66.11       91.44       80.00      73.00     87
S369sxe    69.00       91.44       80.00      73.00     95

Random nitpicks:
The table sorted by flow seems to be misaligned.
All the Holsets are journal bearing
All the Garret GT(non-GTX) are journal bearing
I think 50%+ of the ball bearing listings on there aren't ball bearing.

Thanks for the feedback, I fixed everything and added what you listed. I assumed the S251 was 50 lbs just to approximate it in the chart. Obviously since this was taken from a subaru site the forced performance, blouch and steam turbos dont really apply but I know we are missing some other popular e30 turbos like the turbonetics, Comp (TCD), and Kinugawa turbos. It would be neat to include the KKK turbos from the 2002 and e23.

It is really surprising when you find the number of smaller companies that build turbos, I wonder how many are just rebranded with a new housing. For example here is a local company (Under Pressure Performance) selling a '58-76R' Turbo Ball Bearing. Maybe its just a Garrett 35R with a different compressor cover?

http://uppturbo.com/parts/upp-5876r-dual-ball-bearing/

[mitchlevy7]

Don't forget the new gen 2 GTX garretts!

[Northern]

For example here is a local company (Under Pressure Performance) selling a '58-76R' Turbo Ball Bearing. Maybe its just a Garrett 35R with a different compressor cover?

http://uppturbo.com/parts/upp-5876r-dual-ball-bearing/

Yeah I think they usually mix and match stuff, or make their own compressor wheels (I believe this is how Precision started out).
I feel like this list could bloat pretty bad if we started listing all the variations that people have come up with, and usually they don't flow or work any better than the original.

[downforce22]

I can't seem to find any exacting info, but it would be interesting to see what turbo the n55 uses. This is the best info I can find so far.

http://www.n54tech.com/forums/showthread.php?t=14974

Secondly, the N55 Turbo is pretty cool. It does use a custom version of the smallest Borg Warner EFR Billet Compressor wheel (62mm). However it has a custom inducer sizing, which is quite abit smaller than the exact wheel that is used in the BW EFR 62mm (45.8mm vs. the EFR's 49.6mm) with the extended tip technology. It also uses the twin seal arrangement as do the EFRs (not sure if this is common across other BW units). The turbine has the backing plate like the EFRs as well, but I do not think its a Ti wheel. The turbine is also quite small, approx. 53mm Inducer and 46.1mm Exducer. It is a Journal Bearing Turbo, unlike the EFR. Both housings seem to be built on the EFR foundation. Overall it seems like a very nice unit OEM unit, just does not have much flow potential.

BorgWarner BMW Custom EFR 62 62.00 45.8 53.0 46.1 Journal

Maybe it flows around 40? No wonder the n55 engines have torque so low, that turbo spins up fast and with only 8.8 psi and dual vanos its no wonder bmw started putting this engine in everything.