Redw20855amg

Anyone know if i had a custom pulley made for the HPS Gen 1 how it would affect the supercharger they say the pulley on it almost maxes the little guy out what if i went with a pulley that was between 1-5mm in diameter smaller than than the pulley hps supplys I am trying to get 7-9psi

suicidal4life

Have you searched all the posts by E55cent here and on benzworld as well? He seems to be one of the few, if not only, people who were able to make the Gen1 work well with the 55 engine. I think he ended up running a 2" pulley to get the boost up to a level he was happy with but he also ran water injection to cool it off since it was spinning the blower above max efficiency. The little MP90 blower seems to fill the 43's a lot easier then the 55's

Redw20855amg

Will be running Devils Own Water Methanol, have not but will search him out now..thanks

EDIt:
I think ive read and found every post he made here and there and nada

suicidal4life

Admittedly there is not a ton of info to be gained in his posts but he is one of the only people on this forum who got decent results with the Gen1 on a 55 after doing some custom tweaks. So his posts are a good place to start. It looks like he only got to about 5.5-6 pounds with a 2" pulley and claims he has the SC spinning as fast as it can. Notice he still doesn't make much more HP then nitros 43. Here are a couple of quick links.

https://mbworld.org/forums/2435485-post16.html

https://mbworld.org/forums/1700475-post12.html

https://mbworld.org/forums/1712216-post27.html

http://www.benzworld.org/forums/w210...ml#post1996457

You may be able to get more boost out of the Gen1 then E55cent did but I'm guessing you will be pioneering the way as not many other 55 owners have ventured there.

BTW I saw in another thread where you mentioned getting a hell of a price on your Gen1. I'm curious as to what you paid.

Redw20855amg

PM'ed what i paid i will look through that thank you

EDIt:
Yep missed all of those lol! Looks ike he was running 2.25 I might go for 2.00 and see what happens worst case i overwork and destroy the little blower in which case i can upgrade to a larger one, as I will allready have 99% of the componets to be properly supercharged!

suicidal4life

He was running 2.0" if you re-read the end of his post closely. He was talking about turning the 2.65 down to 2.25 on a 430 engine.

Redw20855amg

Damnit Attention to detail maybe ill get a 2" made and a 1.75" and go from there...HPS supposely runs rich anyways so adding boost will lean out there factory tune wont know until i get it on a wideband I will post up with pics when its done....

Redw20855amg

If you use this http://www.boost.xu1.net/

2.0 for pulley size as said above 5.5-6psi (supposedly tested)
the crank pulley is 151mm right? =to 5.95"

that calculates 9psi boost which is 33% off from supposed real world results
so 1.75" pulley would = 12.6psi minus 33% so roughly 4.2 = 8.4psi

Does this make sense? and the real question if it does will 1.75 spin to fast? that would make a ratio of 151mm/1.75=
Since- 151mm crank pulley, 1.75"=44.5mm 151/44.5=3.39
Ratio- 3.39

blackbenzz

You need to get an efficiency map of the mp112 and go from there. There is a limit to how fast you spin it before losing power. You don't just keep gaining as you spin it faster. Good luck.

Redw20855amg

Thank you