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Discussion Starter · #1 · (Edited)
This is the Powertrain Technical Reference Thread.

A Technical Reference is a document, link or thread containing factual information such as diagrams, specifications, procedures, etc.

This thread contains technical reference documents, links to threads useful as technical reference, as well as links to outside reference sources.

Please do not post comments here. Instead PM me or post a new thread commenting on a particular post in this thread.

Please do feel free to post your own technical references, but please insure that they are authoritative - I want to try to avoid mis-information in this thread!

Thanks,

Chris
 

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Gear-Oil Threads

Gear oil threads
http://www.clubwrx.net/forums/showthread.php?s=&threadid=5584&highlight=diff+oil
http://www.cobbtuning.com/tech/gearoil/index.html

Factory Service Manual Transmission General Information section that describes the function of various systems in the car without going into detailed proceedural level discussions. Sort of a "how it works" section. The PDF excerpt at the link below describes the operation of the WRX Manual Transmission and, more interestingly, the Center Diff.
MT and Center Diff PDF

Complete PM section of the service manual including transmission and rear diff oil change instructions and specifications.
Periodic Maintenance PDF

How manual transmissions work (howstuffworks.com)
That's very good reading with several animations.
How a manual transmission works IN DETAIL

Clutch pedal adjustment
http://www.clubwrx.net/forums/showt...4550&perpage=20&highlight=clutch&pagenumber=2

AWD theory thread
Learn about your AWD system here.

Converting to RWD
http://www.clubwrx.net/forums/showthread.php?s=&threadid=27532

Short shifters composed by KurleeDaddeeWRX
-Kartboy Short Throw Shifter Discussion
http://www.clubwrx.net/forums/showthread.php?s=&threadid=12603
-STI Short Throw Shifter Discussion:
http://www.clubwrx.net/forums/showthread.php?s=&threadid=17814
-Kartboy VS. STI short shifter
http://www.clubwrx.net/forums/showthread.php?s=&threadid=16332&highlight
-Short Throw Shifter Discussion (Various Brands)
http://www.clubwrx.net/forums/showthread.php?s=&threadid=13606
-Best short throw shifter for the buck?
http://www.clubwrx.net/forums/showthread.php?s=&threadid=2586&highlight
-Short Throw Shifters and Their Effect on Syncros
http://www.clubwrx.net/forums/showthread.php?s=&threadid=19751&highlight

STi Parts Install Instructions
http://www.subaru.com/microsites/spt/technical_information.sptmain
 

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Discussion Starter · #3 · (Edited)
STI Group N Bushing Schematic

Thanks to Big_Sky_WRX.

Items in RED are the STI bits.

 

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Speed vs rpm in each gear...

Stock tires:
Code:
RPM--1--2--3--4--5
1000 6 10 14 20 26  
1500 8 15 21 30 39  
2000 11 20 28 39 52  
2500 14 25 35 49 65  
3000 17 30 42 59 78  
3500 19 34 49 69 91 
4000 22 39 56 79 104  
4500 25 44 63 89 117  
5000 28 49 70 98 130  
5500 30 54 77 108 143  
6000 33 59 84 118 156  
6500 36 64 91 128 169  
7000 39 69 98 138 182  
7500 42 74 105 148 195  
8000 44 79 112 158 208
Kumho 712 215/45R17
Code:
RPM--1--2--3--4--5
1000 5 10 14 19 25  
1500 8 14 21 29 38  
2000 11 19 27 39 51  
2500 14 24 34 48 64  
3000 16 29 41 58 76  
3500 19 34 48 68 89 
4000 22 39 55 77 102  
4500 24 43 62 87 114  
5000 27 48 69 97 127  
5500 30 53 76 106 140  
6000 33 58 82 116 153  
6500 35 63 89 125 165  
7000 38 67 96 135 178  
7500 41 72 103 145 191  
8000 43 77 110 154 203
Kumho 712 225/45R17
Code:
RPM--1--2--3--4--5
1000 5 10 14 20 26  
1500 8 15 21 29 39  
2000 11 20 28 39 51  
2500 14 24 35 49 64  
3000 16 29 42 59 77  
3500 19 34 49 68 90  
4000 22 39 56 78 103  
4500 25 44 63 88 116  
5000 27 49 70 98 129  
5500 30 54 76 107 142  
6000 33 59 83 117 154  
6500 36 63 90 127 167  
7000 38 68 97 137 180 
7500 41 73 104 147 193 
8000 44 78 111 156 206
From: http://www.smokemup.com/auto_math/mph_range.php
 

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STi v6 RA gearset speeds
Calculation done on stock STi wheels and tires 225/45/17
Code:
RPM  1st   2nd 	   3rd 	  4th     5th
500	3	5	6	9	12	 
600	4	6	8	10	14	 
700	5	7	9	12	17	 
800	5	8	10	14	19	 
900	6	9	12	16	22	 
1000	6	10	13	17	24	 
1100	7	11	14	19	27	 
1200	8	12	15	21	29	 
1300	8	13	17	22	31	 
1400	9	14	18	24	34	 
1500	10	14	19	26	36	 
1600	10	15	21	28	39	 
1700	11	16	22	29	41	 
1800	12	17	23	31	43	 
1900	12	18	24	33	46	 
2000	13	19	26	35	48	 
2100	14	20	27	36	51	 
2200	14	21	28	38	53	 
2300	15	22	30	40	56	 
2400	16	23	31	42	58	 
2500	16	24	32	43	60	 
2600	17	25	34	45	63	 
2700	17	26	35	47	65	 
2800	18	27	36	48	68	 
2900	19	28	37	50	70	 
3000	19	29	39	52	72	 
3100	20	30	40	54	75	 
3200	21	31	41	55	77	 
3300	21	32	43	57	80	 
3400	22	33	44	59	82	 
3500	23	34	45	61	84	 
3600	23	35	46	62	87	 
3700	24	36	48	64	89	 
3800	25	37	49	66	92	 
3900	25	38	50	67	94	 
4000	26	39	52	69	97	 
4100	26	40	53	71	99	 
4200	27	41	54	73	101	 
4300	28	42	55	74	104	 
4400	28	42	57	76	106	 
4500	29	43	58	78	109	 
4600	30	44	59	80	111	 
4700	30	45	61	81	113	 
4800	31	46	62	83	116	 
4900	32	47	63	85	118	 
5000	32	48	64	87	121	 
5100	33	49	66	88	123	 
5200	34	50	67	90	126	 
5300	34	51	68	92	128	 
5400	35	52	70	93	130	 
5500	36	53	71	95	133	 
5600	36	54	72	97	135	 
5700	37	55	73	99	138	 
5800	37	56	75	100	140	 
5900	38	57	76	102	142	 
6000	39	58	77	104	145	 
6100	39	59	79	106	147	 
6200	40	60	80	107	150	 
6300	41	61	81	109	152	 
6400	41	62	82	111	154	 
6500	42	63	84	112	157	 
6600	43	64	85	114	159	 
6700	43	65	86	116	162	 
6800	44	66	88	118	164	 
6900	45	67	89	119	167	 
7000	45	68	90	121	169	 
7100	46	69	92	123	171	 
7200	47	70	93	125	174
 

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Hi, everyone. Please help me and my 2012 WRX. I drove on a highway no problem, then just as pulling in to my parking spot, I heard noise and felt vibration from the front, almost like when you get a flat tire, but the tires were all fine. I tested steering all the way left and right at slow speed, same bad noise and vibrations. I checked the belts, and the power steering fluid level which was fine, and the steering do not feel heavy. Maybe Viscous Coupling, Center Diff., Transmission, or something else?
I think it is a Powertrain issue, and should be covered by the 5yr / 60,000Mi Powertrain Warranty. I need some good power of information to avoid getting ripped off by the dealer. Please help me.
 
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