Forced induction for 392's. a thread to end them all. - Dodge Challenger Forum: Challenger & SRT8 Forums
Forced Induction From Blowers to Turbos

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post #1 of 24 (permalink) Old 05-25-2019, 12:16 PM Thread Starter
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Exclamation Forced induction for 392's. a thread to end them all.

Greeting to you all

This subject has probably been discussed many time and in numerous threads throughout all challenger forums.

But the reason I am opening it again is to once and for all have a clear vision on how to safely super/turbo charge the infamous 6.4 392 engine without tearing it apart.

Now I know the majority simply would advise not to waste money and brain cells due to the weakness of the engines internals. In fact all of you probably would advise trading it for a hellcat. Now if that was easy and accessible to everyone. this discussion wouldn't be opened over and over.

So, yes I regret not buying a hellcat. not just because its more powerful. but I was a rookie and did not realize the politics behind it. Dodge probably realized that everyone would go to the cheaper alternative and buy a 6.4 and modify it and it would leave the hellcat with a handful of buyer, thus maybe intentionally giving the 392 weak internals that do not handle boost. So by modifying your 6.4 would probably empty your pockets and you would have saved a lot of money by simply buying the 6.2 supercharged Hemi.


Now all that aside (regret, Money wasting and headache). I cannot replace my 6.4. it is not that simple in counties outside of the U.S.

I am left with an ultimatum. Boost my 2016 srt 392 challenger :')


Now, Other than forged pistons, rods, Fuel system and gaskets. What other parts/internals do I need to take in consideration to make my 392 engine withstand at least hellcat power. I'm not talking 1000+ HP. something within the 650-700 Whp.

And if it helps. how could you even improve it to 1000+ HP I am guessing of course changing more internals.


I would really appreciate help from you guys who have had experience with such matters.

And if you cant be bothered to help out, I am pretty sure there are threads that are clear as crystal on the steps and parts needed.

Last edited by Huss; 05-25-2019 at 12:19 PM.
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post #2 of 24 (permalink) Old 05-25-2019, 05:18 PM
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So, yes I regret not buying a hellcat. not just because its more powerful. but I was a rookie and did not realize the politics behind it. Dodge probably realized that everyone would go to the cheaper alternative and buy a 6.4 and modify it and it would leave the hellcat with a handful of buyer, thus maybe intentionally giving the 392 weak internals that do not handle boost. So by modifying your 6.4 would probably empty your pockets and you would have saved a lot of money by simply buying the 6.2 supercharged Hemi.

Wow I didn't realize dodge put that much thought into their designs, intentionally building a weak link in the 2011 Apache engine to help with sales on the 2015 Hellcat platform.


On a serious note, Luke at Steve White is a forum vendor and does exceptional work, reach out to him.
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post #3 of 24 (permalink) Old 05-25-2019, 06:37 PM
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The 392 does not have weak internals but rather a piston design not ideal for forced induction. As noted, Luke at Steve White Motors is a good source (I used). There are others such as high horse performance with a good reputation.

HellCat power levels require internals to the same standard as a hellcat.

I don’t know what year SRT you have you must also have all the externals that can support the power levels; half shafts, differential, drive shaft, etc.

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post #4 of 24 (permalink) Old 05-26-2019, 12:40 PM
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Problem is that when you boost you are adding more power and heat. The 6.4 ring gaps are meant for NA so when things get too hot (tune is not conservative on fuel) the ring expands until the gap closes. You can bust a ring landing on a 5.7 just as on a 6.4.

I doubt the engineers would purposely put in weaker components...otherwise why go through the trouble of adding squirters and forged crank?


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post #5 of 24 (permalink) Old 05-26-2019, 04:48 PM
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Problem is that when you boost you are adding more power and heat. The 6.4 ring gaps are meant for NA so when things get too hot (tune is not conservative on fuel) the ring expands until the gap closes.
Wouldn't a 180° thermostat help with the heat? Wouldn't water/meth injection help. What about E85 or something we have, 93 octane that has 30% ethanol. Doesn't that run cooler than gas? With all 3 of those things maybe the heat is lowered enough that the ring gap is no longer an issue?

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post #6 of 24 (permalink) Old 05-26-2019, 06:39 PM
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post #7 of 24 (permalink) Old 05-26-2019, 06:47 PM
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Wouldn't a 180° thermostat help with the heat? Wouldn't water/meth injection help. What about E85 or something we have, 93 octane that has 30% ethanol. Doesn't that run cooler than gas? With all 3 of those things maybe the heat is lowered enough that the ring gap is no longer an issue?
180F thermostat does not help as much as running water/meth and 93 exclusively. Don't forget the SC heats the air as well. Intercoolers help but you will still see about +30F above ambient IATs. I have a coworker running a procharger on his BMW without an intercooler and his IATs are north of 150F...the air charge is hot.
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post #8 of 24 (permalink) Old 05-26-2019, 10:42 PM
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Get a custom cam. Pushrods. New valve springs retainers ect. Also new timing chain arp studs for the main caps and arp head bolts or arp studs for heads


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post #9 of 24 (permalink) Old 05-26-2019, 11:18 PM
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So what is your goal of having a 700hp car? Racing (road or drag)? Weekend car or daily driver? 700hp is going to take a build, time and money. There are numerous ways to achieve the goal and the method you choose will impact how the car behaves.
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Wouldn't a 180° thermostat help with the heat? Wouldn't water/meth injection help. What about E85 or something we have, 93 octane that has 30% ethanol. Doesn't that run cooler than gas? With all 3 of those things maybe the heat is lowered enough that the ring gap is no longer an issue?
A thermostat only regulates the minimum operating temperature. Just like a house without an air conditioner, you can set your home thermostat to 68 but if it's 105 outside, you can bet the temp in your house is still going to get hotter than 68.
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