! NEW ! - Comprehensive Upper/Lower Pulley Boost Matrix...
Thread Starter
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,835
Likes: 12
From: The Granite State
.
! NEW ! - Comprehensive Upper/Lower Pulley Boost Matrix...
All,
With the release of the newest fixed supercharger pulleys, it seemed like a good time to go back and rework my old pulley matrix to make it more complete.
My last chart also indicated that the smaller upper "clutch style" pulley was 83mm, when most people agree that it's actually 84mm.... a small difference, but it was worth correcting this time around.
This chart is missing one extra column of data that I'd love to incorporate, which is the actual boost (psi) for a given pulley combination. If someone can help me with the formula to derive those values from the information here, or provide a table of values based on SC RPM, I will update this table and repost it. Please let me know if you see any errors on this table as well... I think I've captured everything accurately, but you never know!
I hope this helps everyone out. There are a LOT of options now for both the upper and lower pulleys so it's not that easy to figure out how to combine them to hit a particular ratio (or boost) target.
Enjoy!
-G
With the release of the newest fixed supercharger pulleys, it seemed like a good time to go back and rework my old pulley matrix to make it more complete.
My last chart also indicated that the smaller upper "clutch style" pulley was 83mm, when most people agree that it's actually 84mm.... a small difference, but it was worth correcting this time around.
This chart is missing one extra column of data that I'd love to incorporate, which is the actual boost (psi) for a given pulley combination. If someone can help me with the formula to derive those values from the information here, or provide a table of values based on SC RPM, I will update this table and repost it. Please let me know if you see any errors on this table as well... I think I've captured everything accurately, but you never know!
I hope this helps everyone out. There are a LOT of options now for both the upper and lower pulleys so it's not that easy to figure out how to combine them to hit a particular ratio (or boost) target.
Enjoy!
-G
Senior Member
Joined: Jun 2013
Posts: 325
Likes: 11
ez-go
Hard to determine the last factor unless the same car was used. With improvements to breathing efficiencies naturally there will be many nuances in actual pressure. Some guys report a drop of 1.5 psi with a good set of headers.
PLATINUM SPONSOR
Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
Nice chart and it will help out with all the questions and combos!
You may need an algorithm to come up with a boost chart
Every mod done to the intake side will increase boost some over the pulley ratio, like larger air intakes, larger Tb and porting the blower, while porting heads and exhaust work will lower boost in general. Then last, blower effeciency drops off a lot, as you speed up the blower ratio and with that comes more heat.
You may need an algorithm to come up with a boost chart
Every mod done to the intake side will increase boost some over the pulley ratio, like larger air intakes, larger Tb and porting the blower, while porting heads and exhaust work will lower boost in general. Then last, blower effeciency drops off a lot, as you speed up the blower ratio and with that comes more heat.
__________________
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Trending Topics
Thread Starter
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,835
Likes: 12
From: The Granite State
.
Nice chart and it will help out with all the questions and combos!
You may need an algorithm to come up with a boost chart Every mod done to the intake side will increase boost some over the pulley ratio, like larger air intakes, larger Tb and porting the blower, while porting heads and exhaust work will lower boost in general. Then last, blower effeciency drops off a lot, as you speed up the blower ratio and with that comes more heat.
You may need an algorithm to come up with a boost chart
Every mod done to the intake side will increase boost some over the pulley ratio, like larger air intakes, larger Tb and porting the blower, while porting heads and exhaust work will lower boost in general. Then last, blower effeciency drops off a lot, as you speed up the blower ratio and with that comes more heat.This thing:
I guess the best I could do it solicit feedback from people who actually do datalogging and get their peak boost (psi) numbers and try to add them to this chart? I'd probably need to put some footnotes to call out other "mods" like headers which would affect total boost...
From the MBWorld Archives: (need to validate)
stock==========154mm=10psi (number depends on gear and rpm)
Rentech/kleeman=168mm=12.8psi=+42rwhp
Various========172mm=13.6psi=+54rwhp
VRP===========175mm=14.2psi=+63rwhp
Various========178mm=14.8psi=+72rwhp
Evosport=======180mm=15.2psi=+78rwhp
-G
Last edited by GregMB; Nov 19, 2013 at 11:33 AM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Thread Starter
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,835
Likes: 12
From: The Granite State
.
Black Friday sales are happening soon..... I am trying to prepare myself when the deals appear!!!!
I figure there are probably a few other guys out there who are ready to spend some $$$ but just aren't 100% sure how all of these new products stack up against each other.....
-G
Senior Member
Joined: Jun 2013
Posts: 325
Likes: 11
ez-go
Interesting, top of that chart says max rpm is 13,500 rpm. I wonder if that's the limit Lysholm imposed to ensure longevity. It's already at 13,000 with just the 180 crank pulley. The numbers associated with the rings usually express efficiency. For instance the inner most ring expresses that the compressor has a pretty narrow peak efficiency window of 66% at just under 9psi while flowing about 15 cubic meters per minute. To me that's odd, most maps I've seen measure pounds per minute. Density is a better indication of potential Hp rather than space.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,835
Likes: 12
From: The Granite State
.
I'm not 100% convinced that the chart I posted is an exact match to the supercharger on the M113K motors....
It was just one that I found in old threads, but the displacement appears to be larger than what is actually on our cars.
-G
It was just one that I found in old threads, but the displacement appears to be larger than what is actually on our cars.
-G
MBWorld Fanatic!
Joined: Dec 2011
Posts: 1,485
Likes: 26
From: new ringgold pa
99 ford lightning
as i posted last week tested a car 2 weeks ago kleemans, and a 172mm pulley split intercooler 03 res like mine 54deg rise in aircharge on the dyno. My car stock pulley 27deg rise in intake temp same split. I started both cars at 63deg on the air charge to keep the test equal. and for my car at the track stock pulley 50deg rise in temp start to finish line.
Last edited by 99lightning; Nov 19, 2013 at 02:10 PM.
i have measured the stock sc pulley many times, it is 91mm not 90mm and it is measured from groove to groove, so also the crank pulley must be measured from groove to groove, outer ring crank pulley is 156mm so from groove to groove is 150-151mm.
i have a question for everyone, when you say ex you have a 180mm pulley, is it from outer ring or groove to groove?,
just my thought to be more specific.
i have a question for everyone, when you say ex you have a 180mm pulley, is it from outer ring or groove to groove?,
just my thought to be more specific.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,835
Likes: 12
From: The Granite State
.
Boost psi based on what assumptions?
It's almost impossible to say what the boost psi is unless you know every other component on the target engine (headers, no headers, ported heads) even a BWK can affect whether you get all the boost you "think" you should be getting.... Otherwise you might just be creating belt dust!!!
-G
It's almost impossible to say what the boost psi is unless you know every other component on the target engine (headers, no headers, ported heads) even a BWK can affect whether you get all the boost you "think" you should be getting.... Otherwise you might just be creating belt dust!!!
-G
MBWorld Fanatic!
Joined: Dec 2014
Posts: 1,236
Likes: 72
From: Indianapolis
2004 E55.98 SS Camaro.Jetta TDI. Expedition
GregMG I agree. It's a chart that's been out here for years. Many vets have posted it. That being said its a general baseline. Helps compare increases with different pulleys. It's like comparing mods/dynnos in different locations. It's not to undermine your chart. It is interesting however.
Senior Member
Joined: Jul 2010
Posts: 420
Likes: 0
2006 cls 55 amg
