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NissanTaylor
X-TRAIL ENTHUSIAST
Date Registered: 06-2008
Location: Canberra, ACT
TOTAL POSTS: 244
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Crank Pulleys
Has anyone fitted light weight or underdrive crank pulleys to their xtrails? less load/drag on the engine has to be a good thing.
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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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19/Jun/2008, 5:41 pm
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NissanTaylor
X-TRAIL ENTHUSIAST
Date Registered: 06-2008
Location: Canberra, ACT
TOTAL POSTS: 244
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Re: Crank Pulleys
read em, not really much help. they get mentioned but not discussed. was after any info on charge problems etc with the underdrive pulleys etc.
Taylor
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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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19/Jun/2008, 6:20 pm
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Eggins
X-TRAIL ENTHUSIAST
Date Registered: 08-2004
Location: Brisbane
TOTAL POSTS: 184
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Re: Crank Pulleys
I think the real use for "Undersized" pulleys is where you have a high reving motor, and use high revs a LOT (racing etc). The alternator has a rev range where it works best. In fact if it's spinning too fast, it's fan doesn't work properly and nor does it's electricty generating ability (brushes don't touch slip ringsproperly). So ordinary pulleys are not appropriate for constant high revs.
In a high revving car the problem would be that at high speed the alternator is not working properly, or may even fail, while electrical requirements are highest - fuel injection and ignition coils drawing their highest current.
The biggest problem with ordinary cars and underdrive pulleys is that, the alternator is not in its operating range while the car is idling (and maybe not even at low driving revs), and so the battery voltage starts to slowly fall, just a bit. With a lot of idling and slow driving (stop-start traffic) you could end up with a flat battery! Also all this "charge/not charging" cycling will be putting a lot of extra strain on electricals:
1. Alternator and battery (obvious suspects)
2. ECU and Injectors (the ECU has to adjust injector duty cycle to compensate for voltage, especially at idle)
--- Shawn and Belinda Eggins
2003 STR, K&N, Strut brace, Ground wires, Dunlop LM702's, Tint, Mud flaps, Tow, Nudge, Spots, Mats, Rear scuff plate
http://eggins.synthasite.com/
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21/Jun/2008, 7:05 am
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NissanTaylor
X-TRAIL ENTHUSIAST
Date Registered: 06-2008
Location: Canberra, ACT
TOTAL POSTS: 244
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Re: Crank Pulleys
yeah by "charge problems" i ment with the power steering pump and alternator turning a considerable speed lower than engine rpm, have people had charge lights on the dash come on at idle or light being dim or headlights "strobing". i guess their for people with high power outputs and very little electrical consumables aka stereos and spotlights. cheers for the input
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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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22/Jun/2008, 8:17 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Crank Pulleys
Hi Taylor,
Search ebay for "QR25DE" and you will see the OBX Power Crank Pulley.
It is only 1pound instead of the stock 5pounds so it should give better responsiveness due to less rotational mass.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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8/Aug/2009, 7:18 pm
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he22wa
Date Registered: 08-2010
TOTAL POSTS: 34
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Re: Crank Pulleys
I just installed OBX power crank pulley yesterday and oh boy did it make a difference. when I started the car it just sprang into life really quickly lol. It is definitely more responsive and i feel more in gear acceleration. I think its worth every penny.
--- My Mods: CAI with 3A Filter, Pivot Volt Stabiliser, Audio System, OBX Power Crank Puley, Kansai Headers, Iridium Spark Plugs, UniChip Piggyback ECU, Red Calipers, Twin Tip Muffler, Alutec Strut Bar.
To Do: Under body Brace
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17/Sep/2010, 5:29 pm
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