Rear Diff Options - Power Oversteer Found Here
#1066
EvoM Guru
iTrader: (1)
Sounds normal
#1067
Evolved Member
iTrader: (10)
I'm not sure about the RTV dissolving in oil, but I'd be more concerned about the oil possibly preventing the RTV from sealing properly. Honestly I'm not sure how much it matters at all, but I was surprised to find my RTV still too wet to touch after 1 hour of dry time on a low-humidity day. It will certainly cure faster in different conditions, but I'd rather play it safe.
#1068
wanted to revisit the fluid aspect of this. Mitsu's gear oil (formerly "Diaqueen") is a oil spec'd at SAE90 - strictly speaking viscosity-wise, SAE90 ranges from 13-24 @ 100c, and 600-700 @ 40c!
synthetics, i.e., amsoil severe gear 75w90, runs ~17 @ 100c, and 109 @ 40c, in other words, in range at 100c, and a lot better at 40c.
their 75w110 is even more of a match, 21 @ 100c, 146 @ 40c. Is there any reason these oils can't be used? Anyone know what the rough temperatures on these rear diffs run? I can take some temperature measurements the next time I run and see how they actually come out.
or, anyone know the exact specifications of Mitsu's SAE90 gear oil?
::
here's a data sheet I found on Motul's 90PA - https://www.motul.com/system/product...pdf?1290086771 -- but the specs make me think it's more of a 75w90, and a relatively light one at that
here is their 300 LS 75w90 https://www.motul.com/system/product...pdf?1290086772
Redline lists their 75w90 as a suitable replacement to Mitsubishi's diaqueen gear oil: http://www.redlineoil.com/product.aspx?pid=133&pcid=4
Here is the BITOG thread on it that I just made http://www.bobistheoilguy.com/forums...11#Post3992611
My off the cuff guess on this is that people are just pushing way too much power than what the t-case and diff have been rated for, and at the same time have been using different fluids when the failure occurred. It may be that the diaqueen sae90 is much thicker than a 75w90 and much more able to handle it.
synthetics, i.e., amsoil severe gear 75w90, runs ~17 @ 100c, and 109 @ 40c, in other words, in range at 100c, and a lot better at 40c.
their 75w110 is even more of a match, 21 @ 100c, 146 @ 40c. Is there any reason these oils can't be used? Anyone know what the rough temperatures on these rear diffs run? I can take some temperature measurements the next time I run and see how they actually come out.
or, anyone know the exact specifications of Mitsu's SAE90 gear oil?
::
here's a data sheet I found on Motul's 90PA - https://www.motul.com/system/product...pdf?1290086771 -- but the specs make me think it's more of a 75w90, and a relatively light one at that
here is their 300 LS 75w90 https://www.motul.com/system/product...pdf?1290086772
Redline lists their 75w90 as a suitable replacement to Mitsubishi's diaqueen gear oil: http://www.redlineoil.com/product.aspx?pid=133&pcid=4
Here is the BITOG thread on it that I just made http://www.bobistheoilguy.com/forums...11#Post3992611
My off the cuff guess on this is that people are just pushing way too much power than what the t-case and diff have been rated for, and at the same time have been using different fluids when the failure occurred. It may be that the diaqueen sae90 is much thicker than a 75w90 and much more able to handle it.
Last edited by kyoo; Jan 28, 2016 at 09:50 AM.
#1069
Newbie
iTrader: (4)
I got about 15 pages into this thread and hadn't seen anything mentioned about Rallycross so I thought i would just post. I this mod recommended for RallyXing as well? I want to get the car setup for rallyx but havent had it in the dirt so I can't speak on driving characteristics yet? Any input is appreciated.
#1070
EvoM Guru
iTrader: (1)
This mod is recommended for anyone. It's how the car is supposed to be setup.
#1071
I got about 15 pages into this thread and hadn't seen anything mentioned about Rallycross so I thought i would just post. I this mod recommended for RallyXing as well? I want to get the car setup for rallyx but havent had it in the dirt so I can't speak on driving characteristics yet? Any input is appreciated.
#1072
Newbie
Join Date: Nov 2012
Location: Safety Beach, Australia
Posts: 15
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Hey guys, I live in Australia and I'm wondering if this mod is equally beneficial for cars that do feature the AYC and SAYC?
Im new to evo's but the enthusiasm for this mod is interesting
Matt
Im new to evo's but the enthusiasm for this mod is interesting
Matt
#1073
EvoM Guru
iTrader: (1)
Your car has a properly setup diff. No need for this mod.
#1075
EvoM Guru
iTrader: (1)
Agreed, for the average car a proper 8plate setup should be great. Its the guys who autoX or track with heavily unloaded inside tires and big power that need the extra clamping to get power to the outside wheel.
It will induce lots of oversteer compared to the factory plates, enough so that we run significant toe-in to manage exit rotation. The goal is to use full throttle at exit without spinning inside rear.
It will induce lots of oversteer compared to the factory plates, enough so that we run significant toe-in to manage exit rotation. The goal is to use full throttle at exit without spinning inside rear.
#1076
Evolved Member
iTrader: (22)
Agreed, for the average car a proper 8plate setup should be great. Its the guys who autoX or track with heavily unloaded inside tires and big power that need the extra clamping to get power to the outside wheel.
It will induce lots of oversteer compared to the factory plates, enough so that we run significant toe-in to manage exit rotation. The goal is to use full throttle at exit without spinning inside rear.
It will induce lots of oversteer compared to the factory plates, enough so that we run significant toe-in to manage exit rotation. The goal is to use full throttle at exit without spinning inside rear.
Out of curiosity, how much toe in did you have to run after this mod?
#1077
Agreed, for the average car a proper 8plate setup should be great. Its the guys who autoX or track with heavily unloaded inside tires and big power that need the extra clamping to get power to the outside wheel.
It will induce lots of oversteer compared to the factory plates, enough so that we run significant toe-in to manage exit rotation. The goal is to use full throttle at exit without spinning inside rear.
It will induce lots of oversteer compared to the factory plates, enough so that we run significant toe-in to manage exit rotation. The goal is to use full throttle at exit without spinning inside rear.
#1078
Evolved Member
I have measured the front toe and camber curves but not the rear one.. however, it is highly unlikely that stock car will toe out in bump in the rear... The reason for toe out in bump in front is the same.. safety.. people deal better with understeer..
#1079
Evolved Member
#1080
Evolved Member
iTrader: (15)
wanted to revisit the fluid aspect of this. Mitsu's gear oil (formerly "Diaqueen") is a oil spec'd at SAE90 - strictly speaking viscosity-wise, SAE90 ranges from 13-24 @ 100c, and 600-700 @ 40c!
synthetics, i.e., amsoil severe gear 75w90, runs ~17 @ 100c, and 109 @ 40c, in other words, in range at 100c, and a lot better at 40c.
their 75w110 is even more of a match, 21 @ 100c, 146 @ 40c. Is there any reason these oils can't be used? Anyone know what the rough temperatures on these rear diffs run? I can take some temperature measurements the next time I run and see how they actually come out.
or, anyone know the exact specifications of Mitsu's SAE90 gear oil?
::
here's a data sheet I found on Motul's 90PA - https://www.motul.com/system/product...pdf?1290086771 -- but the specs make me think it's more of a 75w90, and a relatively light one at that
here is their 300 LS 75w90 https://www.motul.com/system/product...pdf?1290086772
Redline lists their 75w90 as a suitable replacement to Mitsubishi's diaqueen gear oil: http://www.redlineoil.com/product.aspx?pid=133&pcid=4
Here is the BITOG thread on it that I just made http://www.bobistheoilguy.com/forums...11#Post3992611
My off the cuff guess on this is that people are just pushing way too much power than what the t-case and diff have been rated for, and at the same time have been using different fluids when the failure occurred. It may be that the diaqueen sae90 is much thicker than a 75w90 and much more able to handle it.
synthetics, i.e., amsoil severe gear 75w90, runs ~17 @ 100c, and 109 @ 40c, in other words, in range at 100c, and a lot better at 40c.
their 75w110 is even more of a match, 21 @ 100c, 146 @ 40c. Is there any reason these oils can't be used? Anyone know what the rough temperatures on these rear diffs run? I can take some temperature measurements the next time I run and see how they actually come out.
or, anyone know the exact specifications of Mitsu's SAE90 gear oil?
::
here's a data sheet I found on Motul's 90PA - https://www.motul.com/system/product...pdf?1290086771 -- but the specs make me think it's more of a 75w90, and a relatively light one at that
here is their 300 LS 75w90 https://www.motul.com/system/product...pdf?1290086772
Redline lists their 75w90 as a suitable replacement to Mitsubishi's diaqueen gear oil: http://www.redlineoil.com/product.aspx?pid=133&pcid=4
Here is the BITOG thread on it that I just made http://www.bobistheoilguy.com/forums...11#Post3992611
My off the cuff guess on this is that people are just pushing way too much power than what the t-case and diff have been rated for, and at the same time have been using different fluids when the failure occurred. It may be that the diaqueen sae90 is much thicker than a 75w90 and much more able to handle it.