sl55per

Just picked up an 03' SL55 for my weekend warrior. Car looks like it came off the showroom floor, only 26K miles.

I am really interested in the EC supercharger pulley, ECU tune, and belt wrap kit to give a little extra boost to this beast. Outside of that I plan on keeping the motor stock. My question is if the second heat exchanger is required?

I preemptively ordered a PLM H/E and a Bosch 010 pump thinking I would need better cooling but I am wondering if the SL has a big enough H/E to handle a supercharger pulley upgrade and tune. I am installing the Bosch 010 regardless.

Future warning to anyone purchasing the PLM H/E, it DOES NOT bolt right up to the SL55 like it does the E55. Not even close, modifications are required. The brackets to the hold the oil cooler will also need tweaking in a SL55 setup as well. I have my car on jacks stands in the garage with the front end off and am disgruntled that I am forced to modify the H/E to get it installed.

I have read about people who separate the cooling, wired the IC pump to always be on with the key, and to turn the fan on 10 degrees early.

My eyes are going cross-eyed spending countless hours searching for anything related to upgrading Mercedes H/E. My question is can I actually get buy with the stock H/E with the new Bosch 010 pump and EC supercharger pulley with tune?

carguyshu

which sized supercharger pulley did you get?

sl55per

I have not made a purchase yet however I am leaning towards the Eurocharged clutch pulley with tune.

carguyshu

there is now more than one size available. There is one that is equivalent to a 168mm crank pulley and one that is equivalent to a 180mm pulley. Eurocharged I believe carries both.

sl55per

Really? Odd, when I am on their site it only shows one size for the clutch version:
http://www.eurocharged.com/products/...2-46-16-detail

They have the fixed pulley that comes in 4 different sizes:
http://www.eurocharged.com/products/...-pulley-detail

Would there be an unsafe safe size when you run the stock H/E with upgraded IC pump?

carguyshu

If you're going supercharger pulley you'll want a belt wrap kit now matter which you choose. I'd stay clear on the fixed ones as there is no safety mechanism to turn the supercharger off in the event things get too hot & you'll pretty much be required to do cooling mods.

The other clutched pulley just came out last month, so I'm guessing they haven't updated their site. Shardul here on the board is the one that makes them for eurocharged i believe. Here's the post announcing the new size:

https://mbworld.org/forums/e55-amg-w...available.html

You could use the 168mm equivalent without upgrading the HE, but even a stock motor would benefit from adding another HE. You could also in theory run the other one without upgrading, but your results would be less than optimal and it wouldn't be recommended. It more depends on how you drive the car as to if you need to upgrade. Once you get a tune from Eurocharged it comes with software that you can real time monitor stuff like air intake temp (I believe you can do this with just your phone too using the torque app and an obd2 connector plugged in). Once IATs start rising above 120 then engine power will start being lost as timing will start getting reduced above and beyond the sheer loss of power created by the higher temps. Logging stuff to see how your car responds is really the only way to know if the cost/benefit of adding an aux HE would be worth it to you and your unique situation and driving style.

Adding longtube headers would be another way to reduce heat that would also have the side benefit of adding another 40+ hp.