R32 Gtr Long Term Love, Now Project

[r32-25t]

Sounds good to me 

[Dose Pipe Sutututu]

1 hour ago, r32-25t said:

Sounds good to me 

Done, whenever you're ready.

Probably will sit in my shelf until I buy a M3 lol.

[MBS206]

3 hours ago, r32-25t said:

Ok so the reason I decided to cancel all Japan day is I was finishing off the last of the wiring and started to look at having to do the relays and fuses for the fuel pumps, thermo fans, trigger for the power steering pump and etc. after looking at the number of wires that were going into the car, I took a step back and thought nah f**k this there’s a better and much neater way to do this!! 

insert pd16 (pdm) here and the problem is solved only issue is I now need to strip the wiring harness, remove the i/o 12 box from it and fit the pd16 instead

I got very lucky and it just happened they came into stock the day after I ordered it, now while this is a set back and will mean having to redo some work, it’ll end up being better for it 

Surprised you didn't go the whole hog on the high-end nexus that's ECU and PDM in one! 😛

 

jealous of that PDM, I'm a poor man playing in a well funded man's sport... I'm stuck with relays and fuses ha ha ha!

[r32-25t]

1 hour ago, MBS206 said:

Surprised you didn't go the whole hog on the high-end nexus that's ECU and PDM in one! 😛

 

jealous of that PDM, I'm a poor man playing in a well funded man's sport... I'm stuck with relays and fuses ha ha ha!

I looked at it and worked out I’d either need to buy a nexus plus a pdm due to the the fact the nexus uses 3 of the 25amp out puts or just the pdm if I kept the elite in there 

[MBS206]

1 hour ago, r32-25t said:

I looked at it and worked out I’d either need to buy a nexus plus a pdm due to the the fact the nexus uses 3 of the 25amp out puts or just the pdm if I kept the elite in there 

No matter how many IO you have, you never have enough... Ha ha ha

[Dose Pipe Sutututu]

Nissan Space Shuttle Program 

[r32-25t]

The only other things I’d want would be more DPI/SPI to measure the 4 wheel speeds and do traction control. not sure my car will make enough power for it to be a real issue though 

[Dose Pipe Sutututu]

You're better off doing a GPS speed sensor vs. the wheel speed as your car would bake all 4x wheels, if the surface isn't optimum.

Having front and rear speed sensors and doing a traction strategy on that only works on FWD or RWD cars.

[MBS206]

10 hours ago, Dose Pipe Sutututu said:

You're better off doing a GPS speed sensor vs. the wheel speed as your car would bake all 4x wheels, if the surface isn't optimum.

Having front and rear speed sensors and doing a traction strategy on that only works on FWD or RWD cars.

From someone in the GPS industry, you'd want it to be a good GPS module, with an actual accurate output (basically doing a lot of sensor fusion with gyros, compass, and accelerometers) or the TCS won't be that great.

[Dose Pipe Sutututu]

2 hours ago, MBS206 said:

From someone in the GPS industry, you'd want it to be a good GPS module, with an actual accurate output (basically doing a lot of sensor fusion with gyros, compass, and accelerometers) or the TCS won't be that great.

For Brett's car the traction strategy would be for straight line attacks, so the Haltech GPS sensor would be sufficient for traction control in his application.

[Duncan]

Fair enough, I can't see it being any where near good enough to compare GPS to wheel speed in most use. Imagine you drove under a tree in a corner, I'm sure we've all had that experience where we were apparently doing 60, then 120, then 30 in the space of a second.

[r32-25t]

I think with most all wheels drive cars you use both the wheels speeds and the gps, I agree the gps will end up useless in some situations and would be interesting to see how the system would react at those times 

[r32-25t]

I also think a lot of these of the huge horsepower roll racing cars are using it and probably most of the drag cars as well 

[TurboTapin]

I was under the impression that Haltech does not allow the use of their GPS speed for traction control. It must be wheel speed sensors.

[r32-25t]

Not sure, I haven’t looked into with the haltech. The motec can definitely use both so that it’s measuring vehicle speed versus wheel speed 

[MBS206]

9 hours ago, Duncan said:

Fair enough, I can't see it being any where near good enough to compare GPS to wheel speed in most use. Imagine you drove under a tree in a corner, I'm sure we've all had that experience where we were apparently doing 60, then 120, then 30 in the space of a second.

Most GPS modules are getting better than that, but still not great unless you're spending big big big dollars.

 

Biggest problem, is it relies on measuring distance, with decente enough error to make it quite difficult to detect did I really move, or just GPS error?

Which means you can have the GPS thinking you've moved when you haven't, and at the same time you've gone to launch and broken into mass wheel spin.

 

This is where you need a heap of sensor fusion from everything else.

 

GNSS and Vehicle Telematics is my niche professional area of work.

 

You would likely have more reliable wheel spin detection on an AWD using steering angle, TPS, and comparing the individual wheel speeds, as well as rate of acceleration, and comparing that with acceptable rate of acceleration at given speeds for given gears, and more so anticipating if it is wheelspin or not, vs using a GNSS sensor compared with wheelspeeds.

[Dose Pipe Sutututu]

21 hours ago, TurboTapin said:

I was under the impression that Haltech does not allow the use of their GPS speed for traction control. It must be wheel speed sensors.

It definitely can, it just comes up as a speed sensor.

[TurboTapin]

25 minutes ago, Dose Pipe Sutututu said:

It definitely can, it just comes up as a speed sensor.

I just gave it a try and it's a no go without an addition wheel sensor. The error states "Traction Control for rear wheel drive requires at least one rear wheel sensor (Or drivetrain sensor) and at least one front wheel speed sensor." 

[SiR_RB]

Motec

[Dose Pipe Sutututu]

On 07/05/2023 at 9:55 AM, TurboTapin said:

I just gave it a try and it's a no go without an addition wheel sensor. The error states "Traction Control for rear wheel drive requires at least one rear wheel sensor (Or drivetrain sensor) and at least one front wheel speed sensor." 

You are correct!

I just played around with it myself and it shows the same error. A workaround is to just create your own Generic and apply ignition correct (as in take timing out) when there's a GPS Speed / Drive Train speed difference.

I'll end up trying this out one day as I want traction control.