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Tracking / Autocross / HPDE / Drifting What these cars were built for!


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Old 12-10-2021, 08:56 AM   #43
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This is what has been discussed elsewhere https://www.dcemotorsport.com/Home/EPAS

The units look very similar to what I ran in my Miata, which is a Koyo from a Saturn Vue (and other cars). The Pro Street ECU looks the same as my control unit and also has the same harness w/ rheostat to control assist.

I would be kind of curious to see what failsafe mode is like on the units we have. Normal assist or turns off completely?
Thanks. I didn't realize we were talking about a stand alone system. With the CAN-bus system in our cars I would be surprised if it would still drive and not go into some limp mode or have other serious issues.
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Old 12-10-2021, 11:11 AM   #44
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I would be kind of curious to see what failsafe mode is like on the units we have. Normal assist or turns off completely?
For what its worth, I run the EPS with its control module as a "standalone" on my LS swap. I just give it power and nothing else and its working at 100% strength all the time. After a year of testing the car at the track I've had many issues, but none of them are related to power steering. That thing stays strong and constant thru the whole session, regardless of loads. So the failsafe that gets triggered is probably not needed and if it could be disable I highly doubt any actual damage would happen to the unit.

Good luck on your problem, it was my problem as well until I swapped engines
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Old 12-14-2021, 10:34 AM   #45
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I would be kind of curious to see what failsafe mode is like on the units we have. Normal assist or turns off completely?[/QUOTE]

If you are referring to the stock 86 EPS unit, i can tell you exactly what it is like. The electric assist suddenly turns off. It does this at very high load moments, so the steering effort instantly becomes MUCH harder. Its not a good feeling, and can make it difficult to maintain a smooth line as it turns off and then back on. I am use to it now, but still hate it.
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Old 12-24-2021, 04:59 AM   #46
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I experience almost the exact same thing on my 2013 when switching to higher grip tires, in high g corners. Almost stock ride height w/ 7k/8k springs. It feels like the electric assist just stops completely during heavy trail braking or cornering.
No sign of rubbing inside the fender well.


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Originally Posted by ROADRACER View Post
I would be kind of curious to see what failsafe mode is like on the units we have. Normal assist or turns off completely?

If you are referring to the stock 86 EPS unit, i can tell you exactly what it is like. The electric assist suddenly turns off. It does this at very high load moments, so the steering effort instantly becomes MUCH harder. Its not a good feeling, and can make it difficult to maintain a smooth line as it turns off and then back on. I am use to it now, but still hate it.
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Old 01-13-2022, 01:48 PM   #47
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I experience almost the exact same thing on my 2013 when switching to higher grip tires, in high g corners. Almost stock ride height w/ 7k/8k springs. It feels like the electric assist just stops completely during heavy trail braking or cornering.
No sign of rubbing inside the fender well.
yea, Its a fairly common problem for track cars that are pushed. Reducing castor helps, but not a lot. It could probably be fixed with a software/firmware update, but I think it is buried so deep in the programming that it would require Subaru engineers/programmers to fix it, and I don't think they really care about our problems.
The steering issue and rear wheel hop when power sliding in the rain are the two things that bother me the most with my car. I have been unsuccessful fixing either of those issues.
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