Gtr 4wd Torque Split Controller

[MountainRunner]

Hi Guys,

I have been developing a 4WD torque split Controller for the GTR. We have been testing it at track day in the White R32 GTR "Cut" and in Michael's Blue R32 GTR. The feedback has been very positive with both these drivers impressed with the results.

As several guys have taken an interest in the project at track day, I thought I would post up the operating manual so you can get the full picture of how it works and what it does.

I have also attached another picture showing the size installed in a R33 GTST. The picture is of another project I am working on, but the case is the same size and gives a good idea of how good it looks. The case is anodised aluminium with laser engraved wording.

Please have a read of the manual (the pdf below the pictures) and let me know what you think.

Paul

4WD_Controller.pdf

Edited July 19, 2006 by MountainRunner

[N1GTR]

Wow, very impressed at the proffesionalism of it all!

Well done!

[hrd-hr30]

quite sophisticated in the tuning of the system and handling with the adjustable gain, and I really like the ability to toggle between maps on the fly. Looks like you've put alot of thought into the design. excellent work Paul! If you ever want another test driver/vehicle let me know! but it looks close to production stage...

[Beer Baron]

that looks excellent. very nice indeed. I will be watching out for when these are released.

[MountainRunner]

Hey guys, thanks for the positve feedback.

I designed it around three ideas. First was the Julian Edgar unit, so Map 1 emulates what it does, changing the gain is the same as turning the dial he had. Setting the device to Map 1, Gain 0 is like running stock.

The second idea was that the GTR turns in really well, but suffers from oversteer on corner exit. The more power you have the worse it gets. So the curves of maps 2, 3, 4 allow the car to handle as stock on corner entry but bring in the front torque harder on exit. Using the gain you can bend those curves to bring it in slightly more / less on corner entry and also on exit. Allowing fine tuning. I think this would also be great for the R33, R34 which drive the front wheels a lot more than the R32. Thus not increasing the load during normal driving. Of course if need to increase the front torque on corner entry you can adjust the gain positive.

The third idea was that on a race track any setup for one set of corners is a compromise on the other set. At QLD raceway, turns 1 and 2 are high speed sweepers, whereas the next few turns (if running Clubman or Sprint) are off camber, tight and a slower speed. So I added the ability to switch between two full setups while driving. You just choose your spot on the track to toggle the switch. Less compromise = quicker laps.

I also put the ability to datalog the lateral and longitudinal G force for handling analysis. Then added a channel for the 4WD Split Gauge on the dash so you can 'see' in the data what effect your setups are having. Allowing post run analysis.

hrd-hr30, you are correct. This device is ready to go. I am making 4 at the moment and 3 have already been ear marked by track day guys.

Paul

Edited July 19, 2006 by MountainRunner

[Col-GTSX]

Good to see there Mountain Runner...

I have closed the old thread and directed any attendion this way...

[Swiper the Fox]

Any future adaptation for a drag module along the lines of HKS's ETC-EDA unit ?. We need to be able to alter front to rear split and to be able to control 4wd drop out at certain rates at different speeds in a straight line accelleration situation.

Well done on the unit....excellent product. Price per unit??

Edited July 19, 2006 by DiRTgarage

[Ska]

Can the gain be set to negative, holding the split to the rears, and rendering it basically to rwd?

[MountainRunner]

Ska, yes the gain can be set to negative. The range is +80% to -80% of the selected Map.

DiRTgarage - I am looking at building a dedicated drag racing version. We have had a few preliminary brain storming sessions about it. What I need is a few guys who want to help with the R&D and testing. If anyone is interested, and does drag their GTR, PM me and I will organise a meeting between us. A few in the group would be ideal. We can keep the skyline community posted on our progress/ideas and get suggestions through another thread.

If anyone has any comments about the manual etc, please post them up or PM me. I want to try and make it the best I can.

Paul

[Swiper the Fox]

Ska, yes the gain can be set to negative. The range is +80% to -80% of the selected Map.

DiRTgarage - I am looking at building a dedicated drag racing version. We have had a few preliminary brain storming sessions about it. What I need is a few guys who want to help with the R&D and testing. If anyone is interested, and does drag their GTR, PM me and I will organise a meeting between us. A few in the group would be ideal. We can keep the skyline community posted on our progress/ideas and get suggestions through another thread.

If anyone has any comments about the manual etc, please post them up or PM me. I want to try and make it the best I can.

Paul

PM sent

[IMACUL8]

I take it these are for R32 GTR's only ??????

Dan

[MountainRunner]

Hey Dan, why do you say that? All GTR's use the ATTESA system to control when the torque goes to the front wheels. They do have different algorithms between models to determine when the torque is distributed. But the theory on adjusting the lateral accelerometer is the same. The way the controller works is to trick the ATTESA into thinking that the car is either cornering harder or softer than it really is. Thus having it determine it needs more or less torque to the front wheels.

I have only been testing on R32 GTR's as they are the guys I know.

Paul

[IMACUL8]

Thanks for the clarification Paul.

I would definately be interested in one for my 34 V Spec II when they are available.

Dan

[fergo308]

so,in short,this unit puts more torque to the front,essentially increasing the car's understeer bias,making a car that has an oversteer tendency on accel more neutral right?

what if the car behaves the opposite way? as in to much understeer on accel? can this work in the reverse to correct that?

Justin...

[MountainRunner]

Yes you can use the gain control to bend the curves in the direction of more torque to the front or less.

Curve 1 will be symetrically more or less based on gain. Curves 2,3,4 can be adjusted to give more or less, but do increasingly apply the signal as the lateral acceleration increases.

Any quesitons or comments on the manual ?

Paul

[jetman]

MANUAL

WHAT MANUAL?

I JUST LOVE THE MANUAL.

My wife also loves the manual!!!!! It is so easy to understand that my wife, who hates cars and anything to do with them, read it and understood it!!!!!!

This is my testimony on the 4WD controller, (seeing that I am one of the lucky few in the world to have one) is, “IT WORKS 100%".

I have had Paul’s 4WD controller and Thermo Controller in my car for some time now and have not been able to fault them. My GT-R is my transport to work, where it sits in the sun all day and also shows up to the occasional Track Day. The Controllers are compact and robust enough to fit anywhere you want them to in the cabin. I have one mounted above the ctr gauges and the other in the ctr console. They are easy to read at night when I’m travelling home from work at 02:00 and don't distract you from the road.

The testing that “I” have done, has mainly been at Track Days where I started using Map 1 with a zero scale factor. My car would be extremely secptable to over steer on most cnrs. Switching then to Map 3 using the toggle switch, with 80 percent scale factor, I would incredibly be able to apply acceleration earlier out of the cnr and not have any problems with oversteer, just a nice 4wd power slide. Glancing quickly mid cnr at the torque indicator, I do remember seeing the needle moving up around the 30 to 50% position at times. The indication lines are close together if you know what I mean. Hard to pinpoint accurately the amount of torque to the front wheels. Waiting for a Data logger cable to arrive to plug into my PDA, so I can log everything it is reading.

Now my car set up is not the greatest for any Track at this stage by my standards, it is good on the road, but on a track, (different kettle of fish), so to make my tail happy car very close to neutral, and giving me better control on fast and slow cnrs, is fantastic.

I know that Paul has spent many, many hours on this project, probably nearly adding up to two years R&D trying to make a product that is user friendly, extremely accurate, sturdy yet robust with an easy to read large backlit LCD display, and dam well perfect.

This 4WD controller is fantastic and a blessing for anyone out there that is having problems with over/ under steering on a GT-R, GTS-4 and/ or anyone who just wants to fine tune there ride for road or track.

Conclusion

I LOVE IT. Just like the Manual.

It is 100% reliable, looks the goods, works, comes in heaps of different colours, and made in Australia.

Can’t get anymore patriotic then that.!!!!

TOP JOB Paully

[MountainRunner]

I would like to thank Michael (jetman) and his lovely wife for the hours they spent with me on the Manual. I also love it. lol.

Seriously though, its guys like Michael, Pierce, Mick and Rajon who make this sort of project possible. They have spent countless hours giving me feedback and performing testing. Giving their time and cars to help out. We wanted to make sure these units were solid.

I want to also thank the guys who have PM'd me and bought the first units. I know this is a new product, and having guys willing to give them a try means a lot.

And thanks also to the guys who took the time to download the manual, have a read and give feedback. This is a great forum, with people happy to give their honest feedback. I think Sam would agree with me, with the launch of his VING website !!

Paul

PS: There are three units in this family, so I eagerly await your feedback on the other two as I get the manuals finalised!!!

[MountainRunner]

Hey Guys,

Thanks for all the comments coming in. If there are any more questions please shoot them through.

I am putting togther a batch now, they are all sold. I will be starting a new batch shortly. If you want to reserve one please PM me.

The price is $659.

Paul

[fritter]

you can get the same thing on ebay for less than $300, is totally variable, not just switchable betwenn 4 or 5 settings and can go between 100% 2wd through to a torque split between the front and the rear of whatever you require. 1-100%, 100%-1.

[Mud]

you can get the same thing on ebay for less than $300, is totally variable, not just switchable betwenn 4 or 5 settings and can go between 100% 2wd through to a torque split between the front and the rear of whatever you require. 1-100%, 100%-1.

you can buy rubber dog shit on ebay too, only 99c.

Cause it's cheap doesn't mean its any good or you're not gonna get ripped off

http://cgi.ebay.com/Lot-of-2-Rubber-Dog-Po...1QQcmdZViewItem