Modify the EPS is it possible?
#1
Modify the EPS is it possible?
Hi,
After my first race in a spec series (with no steering aid) I need to admit that I don't like the feeling of the steering wheel of the rx8.
In fact I think it is not so communicative and I would like to change it a little (less aid) also because I use the car mainly for track events.
Searching on the forum nothing raised and I would like to know if it is possible to change it and how.
Thanking you in advance
Best Regards
Davide
After my first race in a spec series (with no steering aid) I need to admit that I don't like the feeling of the steering wheel of the rx8.
In fact I think it is not so communicative and I would like to change it a little (less aid) also because I use the car mainly for track events.
Searching on the forum nothing raised and I would like to know if it is possible to change it and how.
Thanking you in advance
Best Regards
Davide
#3
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Short answer: Yes it is possible. But I don't know how.
Longer answer:
From my discussions with another forum member that I met in person, I know that modifying the amount of electrical assist on the steering rack is a matter of simple numbers. This other member (as a hobby) hacked and decoded his 2004's ECU, and one of the things he listed as 'exposed' was a table for the electronic steering assist levels. Since a table exists, modifying that table should be possible. In theory, this should be a table that could be modified with the AccessPORT, however, I've never even heard a peep of anyone attempting to or even discussing it on the forum itself.
From discussions relating to power steering failure, I believe it should also be possible to completely kill all steering assist, possibly through disconnecting the sensor harness? I personally wouldn't play around with that, but just tossing it out there as an option or thought. I'm guessing that this would be overkill for what you are trying to do however.
Hopefully this helps you in the right direction.
Longer answer:
From my discussions with another forum member that I met in person, I know that modifying the amount of electrical assist on the steering rack is a matter of simple numbers. This other member (as a hobby) hacked and decoded his 2004's ECU, and one of the things he listed as 'exposed' was a table for the electronic steering assist levels. Since a table exists, modifying that table should be possible. In theory, this should be a table that could be modified with the AccessPORT, however, I've never even heard a peep of anyone attempting to or even discussing it on the forum itself.
From discussions relating to power steering failure, I believe it should also be possible to completely kill all steering assist, possibly through disconnecting the sensor harness? I personally wouldn't play around with that, but just tossing it out there as an option or thought. I'm guessing that this would be overkill for what you are trying to do however.
Hopefully this helps you in the right direction.
#4
Sorry to raise this from the dead. BSE, have you done this successfully on the '8? Does it affect the dsc operation?
Does anyone know what tuning software can access/modify the EPS tables?
relevant:
AutoSpeed - Modifying Electric Power Steering
Does anyone know what tuning software can access/modify the EPS tables?
relevant:
AutoSpeed - Modifying Electric Power Steering
#8
Sorry to raise this from the dead. BSE, have you done this successfully on the '8? Does it affect the dsc operation?
Does anyone know what tuning software can access/modify the EPS tables?
relevant:
AutoSpeed - Modifying Electric Power Steering
Does anyone know what tuning software can access/modify the EPS tables?
relevant:
AutoSpeed - Modifying Electric Power Steering
#9
#10
Weird things as it started working intermittently like it does with loose\oxidised connections.
We linked the potentiometer to the wires that actually power the unit just to play with the idea. Since it didn't work too well we decided to keep it stock.
We linked the potentiometer to the wires that actually power the unit just to play with the idea. Since it didn't work too well we decided to keep it stock.
#11
Which unit? I wouldn't think a regular pot could survive the power level going to the actual assist unit. I was thinking of altering the torque signal to the eps pcm. Did you investigate this approach?
#14
Street car -> no cage -> no harness -> keep airbags. Are there any smaller diameter steering wheel options that retain the airbag? Offsetting the wheels outward should help.
Last edited by cwatson; 09-25-2013 at 02:21 PM.
#16
#20
I read that the same link I posted just now was posted before in 2019 (but is not working). After this there was no answer, so I do not think the question if anyone actually tried this on the RX-8 is so absurd that it can be explained with insufficient english comprehension only...
Post 10 tells me the author installed a potentiometer to the actual power unit which is not the method described in the link I posted.
Many comments I read by you do not contain any useful information but a grumpy and offensive undertone. I guess no one needs that, I don't for sure...
Post 10 tells me the author installed a potentiometer to the actual power unit which is not the method described in the link I posted.
Many comments I read by you do not contain any useful information but a grumpy and offensive undertone. I guess no one needs that, I don't for sure...
#21
No respecter of malarkey
iTrader: (25)
ok I see
it’s the same thing that was discussed and tried in 2013; the link address just changed, which is not unusual over that amount of time.
imo you’ll just be tinkering with something that isn’t going to result in anything meaningful. I have no issue at all with the steering; light in low speed parking and suitably stiff, but not unreasonably so, at speed.
there’s a thread on here about eliminating the power unit by gutting it. Imo this has the most potential for a track car. The issue is that you do need gut the electronics fully in both the rack and the pinion, yet also provide support the rack in the main body with either bushings or bearings. If the electronics aren’t removed from both then there is way too much drag/stiffness. The question is how stiff is it in fully modified form. There hasn’t been much on it, but supposedly somewhere in between the two. The benefit is that it’s both lighter and reduces the alternator load on the engine output.
I was trying to get my hands on a failed rack to experiment with gutting it fully, but nobody ever came through on one for me. I don’t really want to gut a good rack.
.
it’s the same thing that was discussed and tried in 2013; the link address just changed, which is not unusual over that amount of time.
imo you’ll just be tinkering with something that isn’t going to result in anything meaningful. I have no issue at all with the steering; light in low speed parking and suitably stiff, but not unreasonably so, at speed.
there’s a thread on here about eliminating the power unit by gutting it. Imo this has the most potential for a track car. The issue is that you do need gut the electronics fully in both the rack and the pinion, yet also provide support the rack in the main body with either bushings or bearings. If the electronics aren’t removed from both then there is way too much drag/stiffness. The question is how stiff is it in fully modified form. There hasn’t been much on it, but supposedly somewhere in between the two. The benefit is that it’s both lighter and reduces the alternator load on the engine output.
I was trying to get my hands on a failed rack to experiment with gutting it fully, but nobody ever came through on one for me. I don’t really want to gut a good rack.
.
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