Geoff at Full-Race has been helping develop a replacement ATTESSA ECU. Those in the know will be aware that the R32 GTR is quite slow in reacting to firing up the 4x4.....And most that have driven them will know all about 45% oversteer before the 4x4 kicks in.
Now there are plenty of good 4x4 controllers out there, But all they do is give you an adjustment on how much kicks in, not how FAST.
This by all accounts will be a complete replacement of the 4x4 ECU, to give you an idea of the processing power difference (read: Speed) between the R32 and R33 to R34, The R32's processor is 10Hz, and ATTESA-Pro (the active rear LSD ver) was 100Hz in the R33 and 1Mhz in the R34.
This new unit is looking to be 4Mhz !!! :clap::clap:
To me, this would completely eliminate the need for any forms of traction control, and allow the 4x4 system to keep up with the likes of STI's and EVO's who have much better traction.
Watch this space, Geoff will keep us informed when it is available.:thumbsup:
No it doesn't have to have the Active LSD, It will replace the 4x4 ECU.
Geoff has full R32 GTR running gear in his car (read: no active diff) so it will be built to handle at least that and more than likely the active cars as well.
Interested to know how exactly it works... a good aftermarket ECU (i.e. Motec or Vipec) could do the same using 3D tables using the OEM sensors as inputs. I would think so anyway, plus you would get 10 times the processing speed than this device (40MHz).
Yes I know. I would think an engine ECU could do the same; I am sure the same control is achievable setting up tables with inputs and PWM output using the Vipec V88. Just a thought.
Achievable, yes.
But someone would have to guinea pig the setup, pay for labour and development and then at the end of the day all they have is some maps to suit one type of ecu and a wiring diagram... if they wanted to share it.
You would also lose most of your additional ecu input/outputs which would likely otherwise be used for more engine specific parameters.
sounds really interesting. will this be suitable for a R33 as well?
how much are they going to sell for?
sure an engine ecu could do the same, but how long would you need to spend trying to map it... hours, days, on track trying to get it set up right. and you would need a very competent mapper, which leads to ££££`s
a) cost of the right ecu - b) cost of setting it up - against cost of this device???
These are some links to the company that is developing the unit, They make controllers for the STI and EVO centre diffs, This module will differ a lot by the sounds of it, as it is going to be a full replacement of the ATTESSA ecu.
A lot! I've driven all three cars, And the most noticeable difference is between the R32 to the R33. there wasn't as noticeable difference from the R33 to the R34 but the R33 was the only V-Spec one, so had the A-Pro diff.
but this part "It accomplishes this via two hydraulic clutches which can limit torque on individual axles. This system should not be confused with stability control systems which utilize the braking system of a vehicle by individually braking certain wheels to rotate and slow the car (such as Electronic Brakeforce Distribution). AYC is a performance-oriented system which aims to increase cornering speeds"
If its anything like the previous DCCD controllers that manufacturer has made it will incorporate his 2 axis g sensor in the control unit for yaw inputs. R33's already having sensors (at least on the Vspecs, not sure on non V's) use a different system of center diff controls however this should be a programmable replacement for those sensors.
I have to doubt this will be a improvement for any of the active diff r33's or r34's.
The dccd uses a 4mhz processor with a 10bit output vs the 16bit processor in the R33/34's.
It uses a 2 axis sensor as opposed to the 3 axis measurments taken by the stock ecu/sensors. As R32 combat mentioned, it wont make your mechanical side any faster.
All in all i see it being a great upgrade for R32 owners.
I am not sure if this is the correct section, but have you try one of Andy's Skylab controller?
On my R32, it is very noticeable...
It isn't any quicker, but by tracking the ECU and getting more power to the front wheel, you can massively increase the stability of the car.
On the 7 setting, I was getting some power over when I exit the corner...
On the 8 setting, the power over is gone and I can hold the line with the power on at the exit.
Not sure if that is to do with speed, but it does accomplish the same thing and that is to add more stability and traction.
My next project is sitting in the workshop awaiting some time and money to procede. It involves transplanting the drivetrain and suspension, including the ATESSA system, into an older, non Nissan vehicle.
My first question, 'is it possible to get the ATESSA system working in another vehicle', has been answered.
The next one is....., as well as providing performance benefits, will this controller make this type of conversion easier???
I think the standard controller unit reacts quick enough - it deals with very simple amounts of data, it is the latency of the sensors, the hydraulics, the mechanical action (physical transfer of torque), the weight transfer of the chassis, the development of grip from the tyre tread blocks that everyone should consider.
Also no one mentioned driver reaction time.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
GTR Forum
2.4M posts
69.2K members
Since 2001
A forum community dedicated to Nissan Skyline GTR owners and enthusiasts. Come join the discussion about performance, mods, troubleshooting, body kits, classifieds, maintenance, and more!