jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Horsepower @ Stock?? Dyno tests..
quote:
Revhead Kev wrote:
However, Spiro at AutoTech wants Jalal to bring his Xtrail back to do a full 4WD dyno run on it as he is interested to get a comparison himself.
If he can give me a spare rear diff with that, I'll go, otherwise I'll never have my exy on the dyno ever again. hahahaha 
And if Spiro is correct and the 4WD system hasn't been disabled by pulling the relay out, this means my exy was also dynoed in 4WD mode and explains the load on the rear diff too.
The guys who I dynoed my exy with previously at C&V Performance were positive that the 4WD system can be manually disabled by pulling the relay and fuse. They have done it previously.
Last edited by jalalski, 10/Dec/2008, 9:19 pm
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10/Dec/2008, 9:12 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6360
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Re: Horsepower @ Stock?? Dyno tests..
On the proper 4WD dyno the rear wheels turn the second set of rollers so the load on the rear diff is exactly the same as on the road.
Doing a 2WD dyno on a 4wd car would have the rear wheels on a flat fixed surface which leads to the extra load on the rear diff and the damage.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog |
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10/Dec/2008, 9:20 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Horsepower @ Stock?? Dyno tests..
OK, in this case mine was definitely done in 4WD mode then, as it was done on the same dyno as the one you used today and the rear wheels were sitting on a second set of rollers. While this may not explain how my rear diff got fried, it certainly did contribute to it as it happened straight after the dyno run.
I'm very tempted to go back to Spiro and get him to dyno my exy once again, but after the very expensive repair bill, am not sure if I should do that 
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10/Dec/2008, 9:28 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6360
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Re: Horsepower @ Stock?? Dyno tests..
Calling Taylor (or any other Nissan techie) ...
Is there any way you could confirm if pulling the 4WD Actuation Relay completely disables the rear transfer ?
I am thinking that because it is a viscous coupling that there will always be some residual transfer of rotation (maybe not actual torque) since the tailshaft plates are still rotating in the liquid in close proximity to the transfer plates even though the solenoid is not energised.
Possibly the only way to get a true 2WD reading and use a 2WD dyno would be to disconnact and remove the tailshaft between the transmission and rear transfer completely ?
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog |
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11/Dec/2008, 6:21 am
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basshead
X-TRAIL HOLIC
Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: Horsepower @ Stock?? Dyno tests..
quote:
Revhead Kev wrote:
On the proper 4WD dyno the rear wheels turn the second set of rollers so the load on the rear diff is exactly the same as on the road.
I would disagree there, Kev. Are the rollers interlocked in any kind of way? You see, the front wheels driving on the road surface would actually assist the rear wheels to turn as they are eventually attached to the chassis of the car. On the dyno, if the two rollers are completely separate, then the transfer of energy from the front wheels to the rear wheels through the chassis and then to the road to assist in turning the rear wheels does not occur, however the road surface is continuous and relative to the vehicle. I don't know if that makes sense, but I would have difficulty trying to explain it any other way without thinking long and hard about it 
Also Kev, I assume the Torque-split display stopped working when you unplugged the ABS fuse?
Jalal, give it one more go!
Alternatively, you could both meet up sometime and do alternate runs (somewhere safe and "legal" of course!) with my g-tech (I'm assuming it's still in your glovebox, Jalal!)...
--- Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory. |
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12/Dec/2008, 8:40 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6360
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Re: Horsepower @ Stock?? Dyno tests..
I understand you Rich.
quote:
basshead wrote:
Also Kev, I assume the Torque-split display stopped working when you unplugged the ABS fuse?
I actually unplugged the 4WD relay before when I first made the circuit and the torque-split display showed nothing.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog |
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15/Dec/2008, 7:09 pm
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NissanTaylor
X-TRAIL ENTHUSIAST
Date Registered: 06-2008
Location: Canberra, ACT
TOTAL POSTS: 244
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Re: Horsepower @ Stock?? Dyno tests..
quote:
Revhead Kev wrote:
I am thinking that because it is a viscous coupling that there will always be some residual transfer of rotation (maybe not actual torque) since the tailshaft plates are still rotating in the liquid in close proximity to the transfer plates even though the solenoid is not energised
i would have to agree with you 100% on that one Kev, its like some automatic gearboxes that creep forward in 'N', ment to be neutral but gears etc are still turning. thats my guess on why the rear wheels still spin abit in 2WD and why the rear diff gets fried. if all the electronics and viscous coupling were'nt there and it was a full time 4X4 there wouldnt be a problem. even in 4WD mode i imagine on a dyno the diff would get pretty hot pretty quick also. personally i would remove or atleast disconnect the tail shift from the transfer case and completly take the rear diff outta the mix. might show a few more KW's too not having to spin that tailshaft up
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X-897
My Old Platium 07 STS Xtreme - Click Here to check out my mods and pics
Now own a Black C34 Nissan Stagea RS4-S |
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28/Dec/2008, 9:42 pm
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