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      08-15-2013, 07:37 PM   #969
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Anyone know if a larger diameter pulley on the air con will hurt it? Maybe shorten its life?
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      08-15-2013, 11:29 PM   #970
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Quote:
Originally Posted by ZStig View Post
Anyone know if a larger diameter pulley on the air con will hurt it? Maybe shorten its life?
I have never heard of this. If the parasitic drag is a concern, remove it.
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      08-16-2013, 08:35 AM   #971
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Larger pulley is just like riding lower revs for the compressor.
Also the aircon pulley is straight foreward I think. No mass dampers etc. Just the clutch.
I didn't know you could buy aircon compressor pulley's seperately and in different sizes. (it usually is set to the clutch coil inside)

Larger crank pulley will spin the aircon compressor faster and that can maybe do damage/cause extra wear on high revs.
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      08-16-2013, 02:03 PM   #972
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Quote:
Originally Posted by GuidoK View Post
Larger pulley is just like riding lower revs for the compressor.
Also the aircon pulley is straight foreward I think. No mass dampers etc. Just the clutch.
I didn't know you could buy aircon compressor pulley's seperately and in different sizes. (it usually is set to the clutch coil inside)

Larger crank pulley will spin the aircon compressor faster and that can maybe do damage/cause extra wear on high revs.
Slower. It would spin it slower. The crank pull being larger is the only thing that I know of that spin everything faster. Agree with the point though.

Just remove the AC.
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      08-16-2013, 07:27 PM   #973
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still, why mount a larger pulley on the aircon compressor?!?

Losing the aircon all toghether may be a point if you want to lighten your car (you can maybe save 10kg), but lowering the speed of the aircon compressor... I don't see the point.
If you think it takes too much power when you think you need it, just turn it off. Then there is almost zero drag (it has a clutch, so you're just rotating a loose pulley)
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      08-16-2013, 07:37 PM   #974
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Quote:
Originally Posted by GuidoK View Post
still, why mount a larger pulley on the aircon compressor?!?

Losing the aircon all toghether may be a point if you want to lighten your car (you can maybe save 10kg), but lowering the speed of the aircon compressor... I don't see the point.
If you think it takes too much power when you think you need it, just turn it off. Then there is almost zero drag (it has a clutch, so you're just rotating a loose pulley)
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      08-16-2013, 07:48 PM   #975
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Whoa whoa whoa, no aircon removal. Im in south florida. The euro s50? 5.25" crank pulley has a larger aircon pulley built in, hence my apprehension. Indeed it would spin the air compressor slower, hopefully not too slow...
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      08-16-2013, 07:58 PM   #976
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A larger crank pulley would spin it FASTER. The compressor pulley will have to make more rotations for each rotation of the larger crank pulley. The whole reason you're increasing the crank pulley diameter is to spin the supercharger faster, correct? It would spin your accessories faster too.

http://www.engineeringtoolbox.com/pu...ds-d_1620.html

I would think the danger is in overspeeding the compressor. Figure out the max speed of the compressor off a spec sheet, and then use the formula to calculate the max speed it would see based on 8000 rpm and the pulley diameters.
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      08-16-2013, 08:09 PM   #977
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Quote:
Originally Posted by pokeybritches View Post
The whole reason you're increasing the crank pulley diameter is to spin the supercharger faster, correct? It would spin your accessories faster too.
Not necessarily I think?
How is the ESS VT2 system driven?
The aircon pully uses a different belt (and part of the pulley) than the belt that drives the waterpump and alternator. With most systems that's the belt that is also used to drive a supercharger.

The crankpulley has 2 seperate diameters, so obviously you have to change both diameters to change both belt speeds.....
The alternator, waterpump and steeringpump are I think much less sensitive to max rpm as they are very simple mechanically speaking compared to an aircon compressor.
So first you have to get the specs for the new crank pulley if you think of changing it.
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      08-16-2013, 10:13 PM   #978
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Yes, I agree. If the second crank pulley ("air conditioning pulley") diameter is larger, then you will spin those accessories faster. This is what ZStig was suggesting with the Euro S50 pulley, correct?

If it's the same diameter as the current pulley, you'll spin it at the same speed. If it's smaller, you will spin it slower.
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      08-17-2013, 09:28 AM   #979
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Quote:
Originally Posted by pokeybritches View Post
If the second crank pulley ("air conditioning pulley") diameter is larger, then you will spin those accessories faster.
But is it larger? And by how much?

The difference in redline between s50b32 and s54b32 is significant (400rpm), but they also have a different aircon compressor. So they could have matched the revs just as easily in the pulley from the aircon compressor. Who knows. Measuring the diameters between both crank pulleys (the ac part that is) is the only way to know. I haven't seen that data here... (or have I overlooked that?)
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      08-17-2013, 10:13 AM   #980
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Quote:
Originally Posted by GuidoK View Post
But is it larger?
Quote:
Originally Posted by ZStig View Post
The euro s50? 5.25" crank pulley has a larger aircon pulley built in
.
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      08-17-2013, 11:03 AM   #981
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And by how much?
How did he get that information? If he has measured it he also knows what the effects will be and he wouldn't have asked his questions in the way he did.
I've seen lots of information on this forum which turned out to be wrong or not accurate. (you know, read of 'some forum' written by 'some guy')

That's why I wrote
Quote:
Measuring the diameters between both crank pulleys (the ac part that is) is the only way to know. I haven't seen that data here...
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      08-17-2013, 12:05 PM   #982
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Quote:
Originally Posted by ZStig View Post
Anyone know if a larger diameter pulley on the air con will hurt it? Maybe shorten its life?
This was the original question.

Quote:
Originally Posted by pokeybritches View Post
http://www.engineeringtoolbox.com/pu...ds-d_1620.html

I would think the danger is in overspeeding the compressor. Figure out the max speed of the compressor off a spec sheet, and then use the formula to calculate the max speed it would see based on 8000 rpm and the pulley diameters.
And here was the answer.
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      08-17-2013, 12:26 PM   #983
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No, a larger diameter pulley on the aircon wil slow down the aircon compressor.....

There will be no overspeeding....

That only happens if you put a larger diameter pulley on the crank.
So the answer you're displaying is wrong
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      08-17-2013, 12:33 PM   #984
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If you're talking about the air conditioner compressor itself, then yes, a larger pulley on it will slow it down. If the diameter of the crank pulley that drives the air conditioner is increased, it will speed up the compressor.

It doesn't really matter, because I think we're saying the same thing. You need the diameters and plug them in the formula. r1*n1 = r2*n2
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      08-17-2013, 09:46 PM   #985
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Ugh. No. Im not changing the pulley on the aircon compressor. I want to upgrade the CRANK pulley to 5.25" oem euro, and from just pictures i've seen, the second (aircon belt connected) pulley also looks bigger then stock. I will dig up pics, i dont have the measurements of the second pulley on the crank euro pulley
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      08-25-2013, 01:06 PM   #986
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I'm seriously considering staying with my original 5.11" crank pulley, and just getting a 2.87" supercharged pulley which I'll get coated so it won't slip. I'm worried that at 51,278rpm impeller speed, I might make over 11psi of boost, and push the stock engine too far even after a re-tune

plus, the max impeller speed on a vortech v3si is 52k RPM, and ESS used 16psi to get to 600rwhp on a low compression engine. Which is what is scary to me, considering that I'd be near max impeller speed on stock internals

Also, I realized that going catless in section one DECREASED my peak boost. After some research, it appears that the more efficient your engine is at breathing, the less boost you'll read on your gauge because your engine will be using that up, versus being backed up in the gauge. If that makes sense..http://www.928motorsports.com/servic...tingpulley.php
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      08-25-2013, 03:40 PM   #987
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Quote:
Originally Posted by ZStig View Post
I'm seriously considering staying with my original 5.11" crank pulley, and just getting a 2.87" supercharged pulley which I'll get coated so it won't slip. I'm worried that at 51,278rpm impeller speed, I might make over 11psi of boost, and push the stock engine too far even after a re-tune

plus, the max impeller speed on a vortech v3si is 52k RPM, and ESS used 16psi to get to 600rwhp on a low compression engine. Which is what is scary to me, considering that I'd be near max impeller speed on stock internals

Also, I realized that going catless in section one DECREASED my peak boost. After some research, it appears that the more efficient your engine is at breathing, the less boost you'll read on your gauge because your engine will be using that up, versus being backed up in the gauge. If that makes sense..http://www.928motorsports.com/servic...tingpulley.php
What cranks are you comparing?

Also, since its more efficient, you should be able to safely run more boost.
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      08-25-2013, 09:17 PM   #988
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Quote:
Originally Posted by seank View Post
What cranks are you comparing?

Also, since its more efficient, you should be able to safely run more boost.
well I could run a 5.25" crank with a 3.125" for 48,617rpm

or 5.11" crank with a 2.87" crank for 51,278rpm

I have no idea what combo ESS used for their VT3 prototype
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      08-25-2013, 10:06 PM   #989
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Quote:
Originally Posted by Rated M Roadster View Post
4.5 crank and 2.5 SC
Vortech doesn't make a 2.5" pulley for the V3, in 6 rib...
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      08-25-2013, 10:23 PM   #990
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Quote:
Originally Posted by ZStig View Post
Vortech doesn't make a 2.5" pulley for the V3, in 6 rib...
Just ordered a second one from here; this time coated:

http://www.928motorsports.com/parts/6ribpulley.php
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