Drivetrain TRUE Light Weight Vibration Damper Replacement Crank Pulley
#1
TRUE Light Weight Vibration Damper Replacement Crank Pulley
Pilo Racing now has the first ever Replacement Vibration Damper for the Mini Cooper S. This is not like the other crank pulley replacements, that are a solid piece of aluminum that transfer all vibrations through, but a This Vibration Dampner is .30" oversized for the Mini Cooper S to increase boost to the supercharger. The new Damper wieghts only 4.56 lbs, where the stock pulley weights 7.1lbs. That is a 2.54 lb reduction in rotating mass, with out any loss in safety of the operation of your engine.
I will be using this thread to report to you the install procedure, as well as the performance gains with this pulley.
With this pulley, we do not recomend using Supercharger pulley reduction of larger then 19%, as the crank pulley will cause the belt to spin faster. This will give those on a track an advantage, because they can run the larger crank pulley, and a 15% pulley safer then just a 19% pulley because of a larger belt to supercharger contact area. Reducing slipage of the belt. I will have all the HP measurements for 19%, 15%, and 15% with the new Vibration Dampner in the upcoming weeks.
In the mean time, please let me know if you have questions pertaining to the great new item!
Price is not set at this time.
I will be using this thread to report to you the install procedure, as well as the performance gains with this pulley.
With this pulley, we do not recomend using Supercharger pulley reduction of larger then 19%, as the crank pulley will cause the belt to spin faster. This will give those on a track an advantage, because they can run the larger crank pulley, and a 15% pulley safer then just a 19% pulley because of a larger belt to supercharger contact area. Reducing slipage of the belt. I will have all the HP measurements for 19%, 15%, and 15% with the new Vibration Dampner in the upcoming weeks.
In the mean time, please let me know if you have questions pertaining to the great new item!
Price is not set at this time.
Last edited by MiniPilo; 03-02-2005 at 06:00 PM.
#3
Originally Posted by JeffS
So what does that work out to in percentage?
The new Vibration Damper is an overall 5.76" vs. the Stock size of 5.46" This is a 5.5% increase in the size of the crank pulley, or it will turn the belt approx .95" more per turn of the crank.
In the end, I will be listing each combination not in percentages, but in Max Boost achievable.
#5
i've done a few calculations using these numbers:
stock crank: 5.46"
oversize crank: 5.76"
stock pulley: 2.59"
15% pulley: 2.2"
19% pulley: 2.1"
adding to a stock supercharger pulley set up is like a 5% reduction:
5.46(2.59)/5.76=2.46" so 2.46/2.59=0.95
adding this crank pulley to a 15% set up will make it the same a 19%:
5.76/2.2=2.62 and 5.46/2.1=2.60
adding to 19% set up:
5.76/2.1=2.74
2.74(7000rpm)=19180 superchrger rpm @ 7000rpm
and
5.46(2.1)/5.76=1.99 so 1.99/2.59=0.77, which is like a 23% reduction!
eek
stock crank: 5.46"
oversize crank: 5.76"
stock pulley: 2.59"
15% pulley: 2.2"
19% pulley: 2.1"
adding to a stock supercharger pulley set up is like a 5% reduction:
5.46(2.59)/5.76=2.46" so 2.46/2.59=0.95
adding this crank pulley to a 15% set up will make it the same a 19%:
5.76/2.2=2.62 and 5.46/2.1=2.60
adding to 19% set up:
5.76/2.1=2.74
2.74(7000rpm)=19180 superchrger rpm @ 7000rpm
and
5.46(2.1)/5.76=1.99 so 1.99/2.59=0.77, which is like a 23% reduction!
eek
#7
Originally Posted by sonichris
i've done a few calculations using these numbers:
stock crank: 5.46"
oversize crank: 5.76"
stock pulley: 2.59"
15% pulley: 2.2"
19% pulley: 2.1"
adding to a stock supercharger pulley set up is like a 5% reduction:
5.46(2.59)/5.76=2.46" so 2.46/2.59=0.95
adding this crank pulley to a 15% set up will make it the same a 19%:
5.76/2.2=2.62 and 5.46/2.1=2.60
adding to 19% set up:
5.76/2.1=2.74
2.74(7000rpm)=19180 superchrger rpm @ 7000rpm
and
5.46(2.1)/5.76=1.99 so 1.99/2.59=0.77, which is like a 23% reduction!
eek
stock crank: 5.46"
oversize crank: 5.76"
stock pulley: 2.59"
15% pulley: 2.2"
19% pulley: 2.1"
adding to a stock supercharger pulley set up is like a 5% reduction:
5.46(2.59)/5.76=2.46" so 2.46/2.59=0.95
adding this crank pulley to a 15% set up will make it the same a 19%:
5.76/2.2=2.62 and 5.46/2.1=2.60
adding to 19% set up:
5.76/2.1=2.74
2.74(7000rpm)=19180 superchrger rpm @ 7000rpm
and
5.46(2.1)/5.76=1.99 so 1.99/2.59=0.77, which is like a 23% reduction!
eek
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#9
Originally Posted by macncheese
I thought we all agreed that ratios were determined by pitch diameter, not pulley diameter?
Pilo,
Can you explain more about this "boost rating" ?
Pilo,
Can you explain more about this "boost rating" ?
#11
Originally Posted by CustomAV
Dan,
All I wanto to know is how hard is the install and when can I get one?
All I wanto to know is how hard is the install and when can I get one?
#12
Originally Posted by MiniPilo
Pilo Racing now has the first ever Replacement Vibration Damper for the Mini Cooper S. This is not like the other crank pulley replacements, that are a solid piece of aluminum that transfer all vibrations through, but a This Vibration Dampner is .30" oversized for the Mini Cooper S to increase boost to the supercharger. The new Damper wieghts only 4.56 lbs, where the stock pulley weights 7.1lbs. That is a 2.54 lb reduction in rotating mass, with out any loss in safety of the operation of your engine.
#13
Originally Posted by andy@ross-tech.com
Looks very interesting! Have you done any testing with the solid pulleys compared to this one?
#14
Originally Posted by MiniPilo
I only plan to test this unit in comparison to diffrent setup's of Supercharger pulleys. There would be a bit more HP gained most likely on a solid pulley, but I do feel that having an effective vibration damper with a gain in HP is a better solution for most people then the little bit more they may gain with the solid pulley.
#15
LET me say that this product is really interesting. I was checking out the Alta crank pulley previously, but am apprehensive about it. This product seems to address some of my concerns. However, I have some questions...
LIGHTER: How much approximate sprung weight does the savings equate to?
LARGER: What about chips (like the GIAC) tuned for specific pulley sizes (15%, 17%, 19%)? Will you start throwing error codes if you have a chip tuned for a 15% pulley since the larger crank pulley makes the SC pulley spin even faster?
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
LIGHTER: How much approximate sprung weight does the savings equate to?
LARGER: What about chips (like the GIAC) tuned for specific pulley sizes (15%, 17%, 19%)? Will you start throwing error codes if you have a chip tuned for a 15% pulley since the larger crank pulley makes the SC pulley spin even faster?
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
#16
#17
Hope that this answers your questions.
Lighter. It's not really the same as putting lighter wheels for the analogy of sprung to unspung weight theory, but it has a similar effect as putting a 2.5 lb lighter flywheel on the car.
Larger. Having an ECU tuned for a diffrent pulley would not cause it to throw codes, but the HP gain could be more with a properly tuned pulley. I'd suggest if running a 15% pulley with the crank, to ask for a 19% MAP
Limit. It could benefit from larger injectors, but they are not needed.
Life. It has the same effect as a 19% pulley on the supercharger. But with less effect on the belt then the 19% pulley causes. This will lessen the chance of throwing a belt on the track. I have had a 15% pulley for about 10K miles, and a 19% for about 15K miles, both with out any noticable effect to the supercharger.
Lighter. It's not really the same as putting lighter wheels for the analogy of sprung to unspung weight theory, but it has a similar effect as putting a 2.5 lb lighter flywheel on the car.
Larger. Having an ECU tuned for a diffrent pulley would not cause it to throw codes, but the HP gain could be more with a properly tuned pulley. I'd suggest if running a 15% pulley with the crank, to ask for a 19% MAP
Limit. It could benefit from larger injectors, but they are not needed.
Life. It has the same effect as a 19% pulley on the supercharger. But with less effect on the belt then the 19% pulley causes. This will lessen the chance of throwing a belt on the track. I have had a 15% pulley for about 10K miles, and a 19% for about 15K miles, both with out any noticable effect to the supercharger.
Originally Posted by BelowRadar
LET me say that this product is really interesting. I was checking out the Alta crank pulley previously, but am apprehensive about it. This product seems to address some of my concerns. However, I have some questions...
LIGHTER: How much approximate sprung weight does the savings equate to?
LARGER: What about chips (like the GIAC) tuned for specific pulley sizes (15%, 17%, 19%)? Will you start throwing error codes if you have a chip tuned for a 15% pulley since the larger crank pulley makes the SC pulley spin even faster?
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
LIGHTER: How much approximate sprung weight does the savings equate to?
LARGER: What about chips (like the GIAC) tuned for specific pulley sizes (15%, 17%, 19%)? Will you start throwing error codes if you have a chip tuned for a 15% pulley since the larger crank pulley makes the SC pulley spin even faster?
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
#18
Originally Posted by BelowRadar
LIGHTER: How much approximate sprung weight does the savings equate to?
Originally Posted by BelowRadar
LARGER: What about chips (like the GIAC) tuned for specific pulley sizes (15%, 17%, 19%)? Will you start throwing error codes if you have a chip tuned for a 15% pulley since the larger crank pulley makes the SC pulley spin even faster?
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
#19
#20
#21
Originally Posted by MiniPilo
This is the reason that I am going to not use percentages, but boost levels as descriptions of setups.
The downside to that is that so many people here are so used to speaking in percentages - and using "off-the-shelf" tuning solutions. By not listing a "percent" you'll be constantly fielding questions like the above.
#22
Originally Posted by BelowRadar
LIGHTER: How much approximate sprung weight does the savings equate to?
Originally Posted by BelowRadar
LARGER: What about chips (like the GIAC) tuned for specific pulley sizes (15%, 17%, 19%)? Will you start throwing error codes if you have a chip tuned for a 15% pulley since the larger crank pulley makes the SC pulley spin even faster?
Originally Posted by BelowRadar
LIMIT: Running this crank pulley would mean that even with a 15%, you would need bigger injectors to acheive the full potential of the set-up, right?
Originally Posted by BelowRadar
LIFE: The larger crank pulley has to compromise the longevity of the SC in some way. Have you looked into what that reduced life might be?
#23
#25
Originally Posted by AlexN
What about the people that do not want additional boost (like me)?
Will there be a version with stock diameter in the future?
Alex
Will there be a version with stock diameter in the future?
Alex
Pricing Structure:
Retail pricing will be $409.00
If there is enough interest for a group buy of 7 or more, I can lower the price to $350.00