Underdrive Pulley
09-19-2008, 12:20 AM
#51
My MRZ order came in this afternoon too...not the pulley though - the seat braces. I'll be posting pics as soon as my camera finds its' way home...
You got the original size, but lighter, pulley right?
You got the original size, but lighter, pulley right?
Last edited by Red07SSNA; 09-19-2008 at 12:20 AM. Reason: Automerged Doublepost
09-19-2008, 01:02 AM
#52
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It's the lightweight but same size as stock
Can't wait to find out how it revs
09-23-2008, 11:08 AM
#54
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Why would you want to get the same size as stock? Your not going to get any power if its the same size right?
I dont see how it would make a bit of difference besides overall car weight. Isn't it going to spin at the same speed regardless of weight?
I dont see how it would make a bit of difference besides overall car weight. Isn't it going to spin at the same speed regardless of weight?
09-23-2008, 12:07 PM
#55
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Rotational mass buddy...think of it like replacing your flywheel with a lightweight one...less rotational mass=less power wasted in turning and more power to you.
09-23-2008, 01:58 PM
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anyone have any kind of surging idle yet with the underdrive pully?
i think i might go ahead and just order it, i have a fairly large system, butttt, it is a pretty decently supported one with larger grounds (BIG 3), yellow top, and cap.
i think i might go ahead and just order it, i have a fairly large system, butttt, it is a pretty decently supported one with larger grounds (BIG 3), yellow top, and cap.
09-23-2008, 02:00 PM
#61
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yeah i havent even gotten it yet. dont know whats going on i ordered it the 9th and even paid more for the faster shipping.not a happy camper what shpuld i do?
09-23-2008, 03:29 PM
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Hey guys check this out ... I dont think i'm going to be getting this anymore. From a very well known name in the cavi / cobalt scene. Name will remain anonymous.
"Would this be a part that would benefit from a tune following install? IMHO I'd at least want to raise the idle up 100 rpm or so to compensate charging system losses."
Hi Ryan,
my experience with underdrive pulleys is: they are a complete waste of time and money, cause nothing but problems and are simply an un-necessary product companies build for the street simply to make money.
I suggest NOT even considering this modification.
That's my personal point of view.
Also, tuning will not compensate for the charging so I doubt there would be any benefit to having Vince re-tune.
I hope this helps.
"Would this be a part that would benefit from a tune following install? IMHO I'd at least want to raise the idle up 100 rpm or so to compensate charging system losses."
Hi Ryan,
my experience with underdrive pulleys is: they are a complete waste of time and money, cause nothing but problems and are simply an un-necessary product companies build for the street simply to make money.
I suggest NOT even considering this modification.
That's my personal point of view.
Also, tuning will not compensate for the charging so I doubt there would be any benefit to having Vince re-tune.
I hope this helps.
Last edited by RyanRacer48; 09-23-2008 at 03:37 PM. Reason: Automerged Doublepost
09-23-2008, 04:09 PM
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From how it was explained to me. The stock pulleys are set to a certain degree of both mass/rotation and dampening. I've been researching from people who I actually know dyno their cars before and after, rather than just read on the site that it gives 20 horsepower so they calculate their car + 20 horse lol.
Nobody yet besides a few 4.6 Mustang guys have even shown the SLIGHTEST horse power gain, or improved times at the track.
The only thing that it will help is your car to rev faster IN NEUTRAL ONLY.
I've even read that light weight flywheels can actually hurt quarter mile time due to having to dump the clutch at a higher rpm. This last comment is still unsubstantiated, but in a way makes sense.
Nobody yet besides a few 4.6 Mustang guys have even shown the SLIGHTEST horse power gain, or improved times at the track.
The only thing that it will help is your car to rev faster IN NEUTRAL ONLY.
I've even read that light weight flywheels can actually hurt quarter mile time due to having to dump the clutch at a higher rpm. This last comment is still unsubstantiated, but in a way makes sense.
09-23-2008, 05:25 PM
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an underdrive pully is just what the l61 needs, it makes no power down low in the rpm range and getting there quicker will definitely make a difference. anyone who launches a modded l61 knows wht im talking about. ill qoute hack "feels like Vtec when my engine gets past 4 k"
09-23-2008, 05:44 PM
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That's just the drivers fault. Just like when you get all this new power but you dont know how to control it, of course you are going to get worst 1/4 mile times.
09-23-2008, 06:23 PM
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09-24-2008, 01:45 AM
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Alright, you guys go ahead and be the ones to buy em. Have dyno b4 and after. I dont see it gaining any hp, it was explained to me as one of those sell it to ya cuz it sounds good kinda parts. Kinda like front strut braces on front wheel drive cars. Always have been spetical about them. I bought into the hype. & wish 65 bucks ago I never did. Similar to an underdrive pulley, the negatives out weigh the positives.
