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I have three things I want to do, in order of importance:
1) Reduce steering lock-to-lock turns from 3.0 to 2.46 (or around that figure)
2) Reduce brake pedal travel by around 50%
3) Reduce accelerator pedal travel by around 50%
Will this be hard to do you think? I have no experience of ever mod'ing a car. I assume mods like this won't affect insurance.
My problem is that we've got a great car, great engine, great chassis with a sedan user interface. I can't get used to how far I have to move all of the controls to get a reaction. I'm very happy with the reactions when I get them but it feels I'm making too much effort. Your arms and legs are punching and flailing on a twisty mountain road where I just want to flick the steering and gently push (not stamp on the pedals). I haven't measured but there has to be over 30cm or more of travel. Full throttle is a long way down and so is decent braking power.
If anyone ever hears of people who can do/offering these types of mods then please PM me!
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1) Reduce steering lock-to-lock turns from 3.0 to 2.46 (or around that figure)
Yeah, I normally end up going with power steering on sports car models because they normally offer less turns to lock. The NB Miata is one example. But if Mazda doesn't already make a steering rack with the ratio that you are looking for, it will be very expensive to get a good custom setup made for you. Especially since it isn't a standard design.
Quote:
2) Reduce brake pedal travel by around 50%
The best/easiest way I can think of is to modify the pedal so that the "pivot point" is relocated. This will be awkward to do, but it can be done. Changing out the master cylinder might be a different way, but it would involve alot more to get a balanced system, and would void alot more warrantied items.
Quote:
3) Reduce accelerator pedal travel by around 50%
The only way I can think of effectively doing this with the "fly-by-wire" setup is relocating pivot points and attachment points on the pedal itself. Again, awkward and difficult, but doable.
---jps
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Since the system is "Fly-By-Wire" I would think you could adjust the setting inside the CPU of the car. You would have to have a tech do this of course. Since the system is Fly-By-Wire, it would be like adjusting the settings or calibrating a Joystick on a computer system. You could probably have this done for the Gas and Brake system. But the steering system would be different as far as I know.
This is just theory. But I think it would be possible.
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2004 Mazda RX-8 (Titan Gray w/Black/Red Leather) Grand tour with Nav
ordered 1/9/03
Received 7/26/03
Clear Corners, Exaust Finshers, Rotary Accents, MP3 Player, & Aluminum Door Sils
Thanks for the comments. If it's going to be hard / expensive / void warranties I'm probably not going to do it. But I was hoping there might be a computerised way of doing it as even the steering is electronic.
I think my best bet is to wait until Mazda makes a MazdaSpeed 8 or something similar which has settings similar to this, then buy the parts and move them over.
Originally posted by MaRX8 Since the system is "Fly-By-Wire" I would think you could adjust the setting inside the CPU of the car. You would have to have a tech do this of course. Since the system is Fly-By-Wire, it would be like adjusting the settings or calibrating a Joystick on a computer system. You could probably have this done for the Gas and Brake system. But the steering system would be different as far as I know.
This is just theory. But I think it would be possible.
How would you be able to affect the brake pedal travel by a CPU setting?
---jps
__________________
"The truth is faster than fiction."
Originally posted by Sputnik How would you be able to affect the brake pedal travel by a CPU setting?
---jps
You wouldn't actually effect the brake travel, you would effect the pressure applied based on the amount of travel.
Standard set up would be
100% travel is 100% pressure applied.
Recalibrated would be
50% travel 100% pressure applied.
There would still be travel in the brake pedal, so this would manually have to be adjusted also. As far as feel would go.
__________________
2004 Mazda RX-8 (Titan Gray w/Black/Red Leather) Grand tour with Nav
ordered 1/9/03
Received 7/26/03
Clear Corners, Exaust Finshers, Rotary Accents, MP3 Player, & Aluminum Door Sils
Originally posted by JSG I have three things I want to do, in order of importance:
1) Reduce steering lock-to-lock turns from 3.0 to 2.46 (or around that figure)
2) Reduce brake pedal travel by around 50%
3) Reduce accelerator pedal travel by around 50%
Will this be hard to do you think? I have no experience of ever mod'ing a car. I assume mods like this won't affect insurance.
My problem is that we've got a great car, great engine, great chassis with a sedan user interface. I can't get used to how far I have to move all of the controls to get a reaction. I'm very happy with the reactions when I get them but it feels I'm making too much effort. Your arms and legs are punching and flailing on a twisty mountain road where I just want to flick the steering and gently push (not stamp on the pedals). I haven't measured but there has to be over 30cm or more of travel. Full throttle is a long way down and so is decent braking power.
If anyone ever hears of people who can do/offering these types of mods then please PM me!
I know that you can tighten the throttle cable, but the rx8 might be different. this allows faster response in throttle
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Originally posted by JSG I was hoping there might be a computerised way of doing it as even the steering is electronic...
The steering is merely electrically boosted, so changing it would be similar to a normal steering rack (as opposed to the unit BMW is installing in the one car). Depending on how things are setup, you might be able to adjust boost levels, but not the steering ratio.
Quote:
Originally posted by MaRX8 ...You wouldn't actually effect the brake travel, you would effect the pressure applied based on the amount of travel...
And how are you supposed to be able to do that by modifying the CPU?
---jps
__________________
"The truth is faster than fiction."
Originally posted by Sputnik
And how are you supposed to be able to do that by modifying the CPU?
---jps
The CPU would have to connect with a cable interface that would connect to another computer. I'm sure there would be a way to adjust the settings with this computer setup. I don't think you'd be able to do these adjustments on your own. (Fly-By-Wire) means your driving by electrical wire. Or basically a computer is controlling everything. Your Gas and Brake pedals are like game controllers, connected to the CPU. You provide the input through the pedals, the CPU issues out your commands to the other parts of the car. So calibrating these is a possible situation.
__________________
2004 Mazda RX-8 (Titan Gray w/Black/Red Leather) Grand tour with Nav
ordered 1/9/03
Received 7/26/03
Clear Corners, Exaust Finshers, Rotary Accents, MP3 Player, & Aluminum Door Sils
The CPU would have to connect with a cable interface that would connect to another computer. I'm sure there would be a way to adjust the settings with this computer setup. I don't think you'd be able to do these adjustments on your own. (Fly-By-Wire) means your driving by electrical wire. Or basically a computer is controlling everything. Your Gas and Brake pedals are like game controllers, connected to the CPU. You provide the input through the pedals, the CPU issues out your commands to the other parts of the car. So calibrating these is a possible situation.
Yes, it is throttle-by-wire, but is NOT brake-by-wire. The brake pedal is connected to a master cylinder via a brake booster like any other car. The CPU does not control braking force - only the ABS and application of brakes with DSC.
A smaller aftermarket steering wheel would be the easiest way to make the steering more responsive. Not exactly the same but similar.
Changing the pivot point on the pedals like Sputnik mentions probably won't be that difficult and is pretty straightfoward. It is merely a mechanical change; sort of like a short shift kit. If you want to make the pedal travel 50% less, make the lever 50% shorter to the pivot point (mind you the pedal pressure is going to be twice as hard.)
I wouldn't want anyone modifying the code for throttle by wire. That is one area that you don't want a computer bug!
Originally posted by B-Nez Yes, it is throttle-by-wire, but is NOT brake-by-wire. The brake pedal is connected to a master cylinder via a brake booster like any other car. The CPU does not control braking force - only the ABS and application of brakes with DSC.
That's where I was heading. And even if you can change the throttle input in the CPU, that won't change the pedal travel, which is what we are trying to do in the first place.
---jps
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"The truth is faster than fiction."
i can't help you with the steering or throttle question, but as for the brake pedal, here's a suggestion: Replace your rubber brake lines with stainless steel lines, you'll get a much stiffer feel, and better brake response, however you'll want to check the new SS cables about once a year, and possibly replace them, the only drawback to the rubber, it will require more maintainence.
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2005 RX8 Sunlight Silver / Touring - Bone Stock
1993 RX7 Brilliant Black Touring - undergoing LS6 Swap
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