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Re: Interesting idea for a mod
Interesting information and much as I suspected - that we should be able to measure voltage (or at least current) to determine just what the $WD is doing. Still, I'd really really like and up to date electrical schematic of the wiring before I poke around too much. But good to confirm that the one module does the 4WD and ABS - makes sense to me since (as stated before) both functions need to know about wheel rotation.
Has no-one got a service manual with schematics? I seem to remember one guy posted a diagram showing the rear power plug wiring - anyone remember who that was? Maybe they have the manuals.
Greg Smith, WA.
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3/Jun/2006, 6:14 pm
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Re: Interesting idea for a mod
Hi Greg,
There is about 126 pages in the electronic service manual under the (BRC) Brake Control System, which appears to have the info you are after.
I'll host some of the pages here that may be of some use to you. I do recommend that you go and purchase the electronic service manual from Ebay if further info is required.
 
  
  
Last edited by NPC73, 4/Jun/2006, 12:51 am
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4/Jun/2006, 12:46 am
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Re: Interesting idea for a mod
Fantastic stuff. Gimme a few days to digest this info and I'll post an update on my idea. Thanks,
Greg Smith, WA
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4/Jun/2006, 12:54 am
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Re: Interesting idea for a mod
Choppa did state that he managed to cause ABS/4WD to fail, and induce an error code onto the ECU which needed resetting while he was playing around with his multimeter, so be careful 
--- Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_BFG_TBS_home-made-bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory. |
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4/Jun/2006, 2:17 pm
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Re: Interesting idea for a mod
Gents,
I’m going to pose another question to you guys here. Is the drive/power to the rear wheels identical or independent? Meaning if the RHS rear ABS sensor determines slippage at the RHS rear wheel, will the LHS rear wheel engage?
I don’t know enough about the drive train of the rear wheels to be able to comment, however I would expect all four wheel to be totally independent of each other. If it’s independent then I can see this mod to be a fruitless exercise, unless your monitoring all 4 wheels with 4 separate gauges.
Last edited by NPC73, 4/Jun/2006, 2:58 pm
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4/Jun/2006, 2:56 pm
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Re: Interesting idea for a mod
Hi Noel,
The Exy isnt that smart it puts drive to the rear and thats as far as it goes it can tell if one wheel at the rear is going quicker or slower than the other but it cant do anything about it if did we would have one capable 4wd this is the reason people would like to put a LSD in the rear.
Dave
--- (Dave Newcastle 2004 ST
ID: X211
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4/Jun/2006, 4:12 pm
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Re: Interesting idea for a mod
I also believe if it could detect the left rear spinning faster than the right rear wheel, then it wouldn't be that much more difficult for them to include a form of traction control to re-direct drive to the rear wheel which isn't spinning (or spinning slower), which would mean that the faster spinning wheel has less traction than the one spinning slower. I think this also requires what is known as electronic brake force distribution - and applies braking to the wheel that is spinning faster to allow more drive to be given to the slower spinning wheel.
Correct me if I'm wrong
--- Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_BFG_TBS_home-made-bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory. |
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4/Jun/2006, 5:02 pm
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Re: Interesting idea for a mod
Hey guys!
A major development has been carried out by Choppa... Read on and enjoy...
(quoted email below - the bits in bold are my comments)
I've been motivated to look at the circuit for measuring the power to the electronic clutch and devoted some time to it this week.
Here is the circuit I used
The original design measures -25 to +25 amps but is easily converted to + only operation by deleting two components. Further calibrating to measure 0-3amps is done by changing some resistor values. Unfortunately Jaycar/DSE no longer carry the kit so I had to have the PCB made by RCS (who make all the PCB's for those "kits") and of course buy the components. I've had it all sitting there for 6months..just been slack!
Anyway, have been mucking around with it this week and believe I have the proper calibration sorted. Easy to hook up - one wire clips in with the relay 4wd actuator relay on pin 3 and another wire goes to the earth point for the realy (behind the headlights, on the inner guard). The circuit measures the voltage drop between those two points.
A few things I've noted so far about the 4wd system by using this circuit:
* in 2wd mode, there is up to 50% power to the rear wheels under duress situations, i.e. WOT (wide open throttle) with revs. If I start off in wheel spin at half throttle there is no power to the rear but when I follow through to WOT, power is sent to the rear wheels and wheel spin stops. Confirms my earlier thoughts all along. Various documents state there is the possibility of drive going to rear wheels even in 2WD mode, and this confirms it. Previous attempts have been unsuccessful, but I will hopefully try this out at WOT this weekend while we're away at Oberon (I guess it can't get much more slippery than snow on dirt roads - apart from black ice!)
* in AUTO/Lock modes there is no power to the rear wheels unless there is throttle movement. for LOCK, even the smallest throttle movement down will push 100% power to the rear. AUTO seems proportionate to throttle setting and engine load
* in LOCK mode power drops back from 100% after 40km/h (as we already know).
* in all modes there is no power after 80km/h - none at all. in AUTO/LOCK modes it was interesting to watch the power to the rear roll back as I approach 80km/h, even at WOT, I wonder if this proves that dyno runs in 2WD (or any mode for that matter) would be unaffected by the 4WD system (as it's now been proven that it is completely disabled after 80k's). This doesn't however explain the irregularities evident in the peak of the dyno curves on several dyno charts (see performance thread & perhaps twins thread).
* in AUTO mode, power rolls back (but not completely) as you go around a corner and then comes back on again.
* potholes in road "blips" the display..perhaps the g-sensor? I still have to check by tapping it
(end quoted email)
He's going away this weekend and will be testing it extensively.
Last edited by basshead, 9/Jun/2006, 1:52 am
--- Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_BFG_TBS_home-made-bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory. |
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9/Jun/2006, 1:45 am
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Re: Interesting idea for a mod
quote:
* in 2wd mode, there is up to 50% power to the rear wheels under duress situations, i.e. WOT (wide open throttle) with revs. If I start off in wheel spin at half throttle there is no power to the rear but when I follow through to WOT, power is sent to the rear wheels and wheel spin stops.
I do believe part of this if your equipment is showing this however I'm not sure weather the wheel spins stops because of the rear wheels engaging or the fact that the vehicle has alreay started moving as you can see in my last 0-100 speed test in 2WD on dry bitumen:
0-100 Speed Test, Manual exy with the Hi-Tech system
Last edited by NPC73, 17/Feb/2007, 12:41 pm
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9/Jun/2006, 1:49 pm
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