*** VRP Heads Project ***
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Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
So I was right...WE need bigger SC if we want more boost...
Victor have you looked at SLR SC gears for our SCs ???
As far as I know with 175mm pulleys we get about 18psi (1.23) boost in th SC and 14.3 (0.98) to the engine, on this is most efficient level at which our SC works...but then I see MKB and Evotech making thier car run 19.4 Boost (1.34)...so there is space for bigget may be 180mm pulleys with SLR Coolers but fo9r HEAD we still need bigger SC imho...
I am still confused about most efficient boost though
Victor have you looked at SLR SC gears for our SCs ???
As far as I know with 175mm pulleys we get about 18psi (1.23) boost in th SC and 14.3 (0.98) to the engine, on this is most efficient level at which our SC works...but then I see MKB and Evotech making thier car run 19.4 Boost (1.34)...so there is space for bigget may be 180mm pulleys with SLR Coolers but fo9r HEAD we still need bigger SC imho...
I am still confused about most efficient boost though
Stock Pulley - 165mm (14.5 PSI)
ASP Pulley - 178mm (around 17.5 PSI)
Renntech Pulley - 178mm (around 17.5 PSI)
Evosport Pulley - 178mm (around 17.5 PSI)
LET Pulley - 185mm (around 22 PSI)
LET Pulley - 190mm (around ? PSI) - Will install it in a week.
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Joined: Mar 2004
Posts: 5,768
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From: South FL & NYC
Your worst nightmare...
I think that if the SC is spinning within its RPM limits and you have the cooling mods to take the heat out of the extra boost, then you will be OK with a larger pulley. Are the pullies on the E55 the same size as the C32?
Stock Pulley - 165mm (14.5 PSI)
ASP Pulley - 178mm (around 17.5 PSI)
Renntech Pulley - 178mm (around 17.5 PSI)
Evosport Pulley - 178mm (around 17.5 PSI)
LET Pulley - 185mm (around 22 PSI)
LET Pulley - 190mm (around ? PSI) - Will install it in a week.
Stock Pulley - 165mm (14.5 PSI)
ASP Pulley - 178mm (around 17.5 PSI)
Renntech Pulley - 178mm (around 17.5 PSI)
Evosport Pulley - 178mm (around 17.5 PSI)
LET Pulley - 185mm (around 22 PSI)
LET Pulley - 190mm (around ? PSI) - Will install it in a week.
SPONSOR
Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
They are working on an E55 setup now. The pullies are a 3 piece, fluid dampened setup that has a removable hub so you can switch pulley sizes for winter or "low boost" applications. I can change the crank pulley and water pump pulley in ten minutes...including removing / installing the belt.
The C32 pulley is different than the E55, but they can custom build one to your size and specifications for $1500.
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Joined: Jul 2006
Posts: 1,414
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From: Los Angeles, CA
2005 E55
www.letmotorsports.com
They are working on an E55 setup now. The pullies are a 3 piece, fluid dampened setup that has a removable hub so you can switch pulley sizes for winter or "low boost" applications. I can change the crank pulley and water pump pulley in ten minutes...including removing / installing the belt.
The C32 pulley is different than the E55, but they can custom build one to your size and specifications for $1500.
They are working on an E55 setup now. The pullies are a 3 piece, fluid dampened setup that has a removable hub so you can switch pulley sizes for winter or "low boost" applications. I can change the crank pulley and water pump pulley in ten minutes...including removing / installing the belt.
The C32 pulley is different than the E55, but they can custom build one to your size and specifications for $1500.
How much was the already-made C32 one? Not custom build size.
SPONSOR
Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
Sorry Vic...back to the topic.
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Joined: Jun 2004
Posts: 2,596
Likes: 1
From: Moscow, Russia
E55K
Very intresting...but I am not too sure still if bigger then 175mm (inside ring) pulleys will work on E55....I was going to make 183, 187 and 190 pulleys...but thent I was told that the SC become inefficient...
Thread Starter
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Joined: May 2004
Posts: 3,797
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From: Richmond Hill, Ontario
2003 E55 AMG
Well.. we've done quite a few sets of heads on the MB 5.5 motors now. I've basically decided that moving forward all the heads will only be offered with the larger valves.
For the amount of work, labour and costs involved in swapping heads on these cars, paying the extra money up front for the larger valves goes alot further in terms of power potential.
This latest set is going to one of our dealers down in North Carolina. They will be installed on a VR700 S55 that he is building for a client of his. We will get some updated dyno numbers soon.
The heads were flow tested on a Superflow bench along with our custom cams.. I will post the flow numbers a little later once I've had a chance to get the report from the machine shop.
I know pics are worth a 1,000 words so here are a few...
For the amount of work, labour and costs involved in swapping heads on these cars, paying the extra money up front for the larger valves goes alot further in terms of power potential.
This latest set is going to one of our dealers down in North Carolina. They will be installed on a VR700 S55 that he is building for a client of his. We will get some updated dyno numbers soon.
The heads were flow tested on a Superflow bench along with our custom cams.. I will post the flow numbers a little later once I've had a chance to get the report from the machine shop.
I know pics are worth a 1,000 words so here are a few...
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Thread Starter
Banned
Joined: May 2004
Posts: 3,797
Likes: 2
From: Richmond Hill, Ontario
2003 E55 AMG
The machine shop didn't fax over the flowbench results but I will pick them up when I head over there.. I called to get the numbers just so I had something to share in the meantime..
We picked up some nice flow, that's for sure!!
Stock heads flow around 250cfm @ .450lift on the intake side and 153cfm @ .400lift on the exhaust side.
Our latest heads with enlarged valves flowed 322cfm @ .450lift on the intake side and 206cfm @ .400lift on the exhaust side.
Next up is dyno testing and refining the tuning.
-----------------------------------------------
You don't have to get the cams, but, they do compliment the porting on the heads and take advantage of the extra airflow. The bottom line is we need to dyno and test the heads on a stock cam car and see what it makes and then compare it to the VRP cam'd car and see what the differences are.
We picked up some nice flow, that's for sure!!
Stock heads flow around 250cfm @ .450lift on the intake side and 153cfm @ .400lift on the exhaust side.
Our latest heads with enlarged valves flowed 322cfm @ .450lift on the intake side and 206cfm @ .400lift on the exhaust side.
Next up is dyno testing and refining the tuning.
-----------------------------------------------
You don't have to get the cams, but, they do compliment the porting on the heads and take advantage of the extra airflow. The bottom line is we need to dyno and test the heads on a stock cam car and see what it makes and then compare it to the VRP cam'd car and see what the differences are.
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Joined: Dec 2007
Posts: 1,862
Likes: 5
From: Sin City
2005 E55 AMG - - 2005 SL55 AMG - - - - - - 2006 SLK55 AMG - - - - - - 2013 Ducati Diavel AMG -
Well.. we've done quite a few sets of heads on the MB 5.5 motors now. I've basically decided that moving forward all the heads will only be offered with the larger valves.
For the amount of work, labour and costs involved in swapping heads on these cars, paying the extra money up front for the larger valves goes alot further in terms of power potential.
For the amount of work, labour and costs involved in swapping heads on these cars, paying the extra money up front for the larger valves goes alot further in terms of power potential.
These bad boys look great!
