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NissanTaylor Profile
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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
19/Jun/2008, 6:41 pm Link to this post Send Email PM   Send Private Message
 
basshead Profile
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: Crank Pulleys


Taylor,

Check these threads out:

http://www.runboard.com/baustralianxtrail.f17.t123690

http://www.runboard.com/baustralianxtrail.f15.t123813



Last edited by jalalski, 19/Jun/2008, 7:16 pm


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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.
19/Jun/2008, 7:01 pm Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
NissanTaylor Profile
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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
19/Jun/2008, 7:20 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: Crank Pulleys


I almost bought a set of underdrive pulleys for my previous car; after browsing a couple of different related forums, came to the conclusion that it would not be detrimental to the engine (that is purely my opinion from experience of others that had installed them). One of the main concerns I had was alternator output (is that what you implied by "charge problems"?) due to running a substantial stereo system, and my research showed that the output of the alternator would only slightly affected by the underdrive pulleys; once you got up to speed (and therefore revs) it was no longer an issue.

I wouldn't expect our engine to be any different to any other engine with the use of the pulleys.

I was going to provide some other links for you to read in other forums but the search came up with too many results for me to try and narrow them down to a suitable number. I expect you've probably already read up on it considerably anyway.



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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.
20/Jun/2008, 9:24 am Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
Eggins Profile
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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)



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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/
21/Jun/2008, 8:05 am Link to this post Send Email PM   Send Private Message
 
NissanTaylor Profile
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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
22/Jun/2008, 9:17 pm Link to this post Send Email PM   Send Private Message
 
Robbo0001 Profile
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Date Registered: 07-2008
Location: Brisvegas, Australia
TOTAL POSTS: 1063
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Re: Crank Pulleys


There is a new pulley available from the States that doesnt reduce the OD, purely reduces the weight.
Brings it down to 80-90 percent of the stock pulley weight.
No charging or accessory faults reported, as apart from the weight there is no change to the vehicle setup.
Manufactured by DBM, pulley listed as "Unorthodox Racing Ultra S Stock Diameter Crank Pulley."

I want one when time and funds permit..... emoticon been looking at these for a few months
Dreaming has its limits, heres hoping
cheers

edit....spelling

Last edited by Robbo0001, 8/Aug/2009, 3:03 pm


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Dave
99 GU Patrol 2.8TD
Ex-2002 T30 TI Xtrail
8/Aug/2009, 3:02 pm Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5406
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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.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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8/Aug/2009, 8:18 pm Link to this post Send Email PM   Send Private Message Blog
 
he22wa Profile
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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. emoticon

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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
17/Sep/2010, 6:29 pm Link to this post Send Email PM   Send Private Message Blog
 
Robbo0001 Profile
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Date Registered: 07-2008
Location: Brisvegas, Australia
TOTAL POSTS: 1063
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Re: Crank Pulleys


Gpoing off memory here ( emoticon ) but if you remove 2-4 kgs of the crank...it has to spool up better emoticon

Nice work mate...any info or photos on the install?
Where from?
Did the pulley match up perfectly and was it balanced?

Is this the same size pulley as stock, but reduced weight? Or a smaller pulley?

Cheers
Edit...new question on underdrive or orthodox

Last edited by Robbo0001, 18/Sep/2010, 12:18 am


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Dave
99 GU Patrol 2.8TD
Ex-2002 T30 TI Xtrail
18/Sep/2010, 12:14 am Link to this post Send Email PM   Send Private Message
 


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