Underdrive Crank Pulley?
08-15-2008, 04:42 AM
#121
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Originally Posted by A.H
So anyone believe or have insight info if these are going to ship Tomatrow like the website says?
no word as of yet, and we have the first 10 reserved
08-15-2008, 12:58 PM
#124
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Yep mine is coming on Tuesday and im installing it on Wednesday. As for dyno results i talked to shawn and let him know that i am going to be doing a before and after dyno for these and he told me he is seeing a problem with the results showing on the dyno. He told me taht even though the car feels different something abut nissans ECU doesnt allow it to show gains on teh dyno unless the car has like 2-4K miles on it with the pulley. He told me for the 03-06 pulleys they dynoed the car every 3 months and after each session teh gains increased. Wierd but can't wait for my results
EDIT: ANd i think the pulley has a 6 pound reduction
EDIT: ANd i think the pulley has a 6 pound reduction
08-15-2008, 01:05 PM
#125
Originally Posted by A.H
Yep mine is coming on Tuesday and im installing it on Wednesday. As for dyno results i talked to shawn and let him know that i am going to be doing a before and after dyno for these and he told me he is seeing a problem with the results showing on the dyno. He told me taht even though the car feels different something abut nissans ECU doesnt allow it to show gains on teh dyno unless the car has like 2-4K miles on it with the pulley. He told me for the 03-06 pulleys they dynoed the car every 3 months and after each session teh gains increased. Wierd but can't wait for my results
EDIT: ANd i think the pulley has a 6 pound reduction
EDIT: ANd i think the pulley has a 6 pound reduction
08-15-2008, 01:09 PM
#126
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Like Shawn said they take a while to kick in with the factory ECU so im installing mine on the 20th and dynoing on the 25th. IF you waited 5 days too i think that woudl be a good idea. He told me the harder you drive it in those 5 days the better results you would see on a dyno. Idk why its like that but we'll soon find out if it shows any gains on the dyno.
08-15-2008, 03:32 PM
#128
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The stock ECU needs to recalibrate for the lightened rotational mass. That's not something you can reflash or tune for. Lightened pulleys have no effect on A/F.
08-18-2008, 12:06 PM
#129
Originally Posted by A.H
Yep mine is coming on Tuesday and im installing it on Wednesday. As for dyno results i talked to shawn and let him know that i am going to be doing a before and after dyno for these and he told me he is seeing a problem with the results showing on the dyno. He told me taht even though the car feels different something abut nissans ECU doesnt allow it to show gains on teh dyno unless the car has like 2-4K miles on it with the pulley. He told me for the 03-06 pulleys they dynoed the car every 3 months and after each session teh gains increased. Wierd but can't wait for my results
EDIT: ANd i think the pulley has a 6 pound reduction
EDIT: ANd i think the pulley has a 6 pound reduction
08-18-2008, 12:53 PM
#130
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Originally Posted by A.H
Yep mine is coming on Tuesday and im installing it on Wednesday. As for dyno results i talked to shawn and let him know that i am going to be doing a before and after dyno for these and he told me he is seeing a problem with the results showing on the dyno. He told me taht even though the car feels different something abut nissans ECU doesnt allow it to show gains on teh dyno unless the car has like 2-4K miles on it with the pulley. He told me for the 03-06 pulleys they dynoed the car every 3 months and after each session teh gains increased. Wierd but can't wait for my results
EDIT: ANd i think the pulley has a 6 pound reduction
EDIT: ANd i think the pulley has a 6 pound reduction
The reason why the UDP won't show gains on the dyno is because removing 6lbs of rotational weight straight off 7" diameter crank pulley hub doesn't make a big impact in terms of power or acceleration. The only things you'll notice is quicker revving engine in nuetral, a slightly boggier launch, and some increased NVH through the pedals and shifter because you've removed the dampening characteristics of the OEM pulley which is actually two peices sandwiched with an elastomer ring.
I've got $20 saying none of you are going to see more than 1-3whp with these pullies and no changes in 1/4 mile performance.
08-18-2008, 03:56 PM
#131
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Originally Posted by 350Zimo
hey write a review of the pulley. Unfortunately, mine will be here on Friday. 5 long days away. I cant wait to see if there is going to be any substantial difference.
08-18-2008, 07:29 PM
#132
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I just called and asked for shawn to track it for me. I got 2nd day shiping cause i have to install it on wednesday when im at technosquare and regular ground would get here on thursday.
P.S= DAVE B i never said that it would gain 10-12WHP. ALl i did was quote UR and im going to test the claim and if it only gains 2WHP so be it...
P.S= DAVE B i never said that it would gain 10-12WHP. ALl i did was quote UR and im going to test the claim and if it only gains 2WHP so be it...
08-18-2008, 08:41 PM
#133
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Originally Posted by A.H
P.S= DAVE B i never said that it would gain 10-12WHP. ALl i did was quote UR and im going to test the claim and if it only gains 2WHP so be it...
08-18-2008, 10:21 PM
#136
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Originally Posted by Phenom
Why is it that every single performance mod for our car sparks a huge debate on whether it will be useful or a complete waste of $$$ ?
That simply means that the only option left is save for boooooost
That simply means that the only option left is save for boooooost
I however am very happy with the power and performance with my NA Z and it is enough for me
08-19-2008, 04:18 PM
#137
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Just got my pulley in mail!!!Looked at it and it seems very well manufactured. Im hoping to install it this thursday and my dyno for these has changed to August 26 which is fine by me. I will write a review but i think i'll wait a few days after i install it to give a proper review. Updates to come....
-Arsh
-Arsh
08-19-2008, 05:28 PM
#138
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Originally Posted by Phenom
Why is it that every single performance mod for our car sparks a huge debate on whether it will be useful or a complete waste of $$$ ?
That simply means that the only option left is save for boooooost
That simply means that the only option left is save for boooooost
