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Retired American Fighting Man
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The Hellcat Supercharger is made by IHI Turbo America. IHI builds superchargers for Mercedes AMG engines. The supercharger produces 11.6 pounds of boost and I am sure it can push at least 14 pounds of boost. I heard people talk about Diablo Trinity tuning the Hellcat, but if you want more horsepower don't you have to change out the supercharger pulleys to produce more horsepower? Just throwing this out there for discussion.

BKuz
 

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Left Shark
Challenger SRT Hellcat
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Seems like I've heard it's 'boost limited' to 11.6. I'm not sure if they are doing that via the pulley size or if there is a blow-off valve somewhere? If there is some type of blow-off valve, that could probably be modified (stiffer spring(s)) or replaced...but until you can alter fuel/spark in the ECU I wouldn't touch it. Outside of that, yes a smaller pulley for any measurable performance increase...which again will require tuning. Beyond that, someday Whipple and/or Kenne Bell may make some larger superchargers for these cars.

And when you start getting smaller and smaller pulleys, then you have problems with belt slippage because there just isn't enough surface area for the belt to grip.
 
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Yep, its got a HEMI
Challenger SRT Hellcat
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belt slip will be a huge problem!
also it takes hp to spin the pulley. My theory is the small the pulley the more hp it takes to spin it.
This comes from my playing with my GT500 and the upgrades over the course of a couple years. Seems like I lost a bit of low end power on the Shelby with the smaller pulley but got a ton more on the mid and big end.

Probably not a bad thing, tires don't hook up as it is.
 

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Left Shark
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belt slip will be a huge problem!
also it takes hp to spin the pulley. My theory is the small the pulley the more hp it takes to spin it.
This comes from my playing with my GT500 and the upgrades over the course of a couple years. Seems like I lost a bit of low end power on the Shelby with the smaller pulley but got a ton more on the mid and big end.

Probably not a bad thing, tires don't hook up as it is.
True, might actually help on launch. They make those pulleys with those very rough textures, but then the belt doesn't last as long. Also seen people go to a wider belt and pulleys with more ribs.
 

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True, might actually help on launch. They make those pulleys with those very rough textures, but then the belt doesn't last as long. Also seen people go to a wider belt and pulleys with more ribs.
Isnt the belt on the pulley already pretty big, comparatively speaking? What does it look like compared to your mustang? I have heard a lot of comments on the width of the belt being pretty big. I am just curious because I was planning on messing with the pulley diameter when I get mine. Thanks for any insight.
 

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Left Shark
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I had forgot the Hellcats already had a 10-rib belt. Would be hard to find a wider belt.
 

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The hellcat has a very wide belt already.. plus there is a blow off valve and im sure that can be controlled to hold boost longer.. but the bigger problem we will have is the is a spring loaded pulley that fits inside the supercharger pulley and its used to keep the the supercharger from running when not needed,and from turning backwards... the is write up about it in this forum..They hint around at things that can be tweeked
 

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Also need to know what the max flow rate is on injectors. If you run out of injector pulse width due to more airflow the throttle will close a liitle so that engine will not run lean. Running lean on this engine will ruin pistons and wreak havoc.

Can't do this without changing cal.
 

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I don't think anything is going to work until you can remap/ rewrite the ecm...But there has to be room to make more power, there all write ups everywhere saying the built the car to handle more power, and rumors that it was making better to 800 hp at the motor
 

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I don't think anything is going to work until you can remap/ rewrite the ecm...But there has to be room to make more power, there all write ups everywhere saying the built the car to handle more power, and rumors that it was making better to 800 hp at the motor
Yeah I heard it has been tuned down as well. Emissions problems and what not.
 

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I agree.

The key is whether or not the 800+ was accomplished on an engine dyno or the actual vehicle. I'm sure you could do it on the dyno but whether there is enough infrastructure to support the extra horsepower in the car is another thing.
 

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Left Shark
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They make the superchargers in Indiana, I googled it...
Link please...because IHI is a Japanese company...and this is such a low production run...I find it hard to believe that IHI, the supercharger manufacturer of Mercedes AMG has a plant in Indiana...
 

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I think the car is built for the power, and can withstand it with little problems, but I think the issue cam down to emissions,, some states are very tough on getting cars pasted , so why not detune them all and they can go anywhere and pass.. but for those of us that live in states with relaxed emissions, I for one want more power,
 

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I think the car is built for the power, and can withstand it with little problems, but I think the issue cam down to emissions,, some states are very tough on getting cars pasted , so why not detune them all and they can go anywhere and pass.. but for those of us that live in states with relaxed emissions, I for one want more power,
Yep...I live in one of those don't-give-a-$hit-about-emissions-states. Yay me!
 

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There is power on the table without swapping pulleys, a tune will absolutely make more power.

But tunes won't be out soon...I think there's going to be a long wait for tuning options to surface.
 

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Not if the ECM is locked up like the diesel trucks are they won't....and word is they are locked up tight.
 
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