Can you boost a 6.4? Finally a real answer

[@martinbrian300]

My 392 scat has the Whipple gen 5 3.0 boosted to 5psi ported 88mm throttle body, hellcat air box that’s it. Had tuned and dyno tested 638 whp. Being 6 spd had to put M/T 17R 305 on the rear, with diff brace. I drive it hard on the weekends only one year now. No problems, Low 7 sec car in the 1/8 mile now I’m very satisfied with the performance gain. total cost Car new $38,000, mods $12,000

[@300Lawski]

Is the whine loud at that psi?

[@Infamous_wu13]

im at 7.5 with my NA scat rn, looking to boost it to get under 7

[@raycaraway3230]

Glad you put this up. We have been running at 9 psi with a Procharger for almost 25,000 miles without a hiccup and now we are running at 12 psi for over a year. All stock longblock. We have upgraded the fuel system with FIC 1000cc, Fore dual 274 pumps with -10 feed and -8 return and running e85 along with a Snow performance H2o/meth kit as well. Never dynoed the car. It is tuned by Chris Ward at Saywhentuning. Keep up the work.

[@johnparts3405]

Yeah I have a red eye pump and 1/2 feed coming to support 15 psi soon. It’s fun. I’ll be posting more on this subject soon here so stay tuned!!!

[@johnparts3405]

One thing with the Procharger is it doesn’t make a ton of boost under 2500 rpm. The positive displacement superchargers make 6 psi on the hit so the tunes are very different between the 2

[@raycaraway3230]

@@johnparts3405 yep. I am fully aware of the PD vs Centri. That's what makes yours so damn impressive.

[@johnparts3405]

Yeah it’s that extra low end torque that I personally really enjoy too

[@675daytonarider]

Are you local to Houston? I need a tune shop for the 392 swap I’m doing on my JK. I’d like run twins at 6-7 psi.

[@Alwayz_Angry]

Love to see the correct knowledge put out there! Defier Performance knows what’s up johns been doing hemis for decades

[@lterry21]

This is great to see. Dodge decided to screw all the Scatpack owners after they told us there would be staging kits and then it never happens but instead they decide to have staging kits for the upcoming EV's smh...Great job and thank you sir now I know it can be done. Screw you Dodge!!!

[@3hungesrt]

I run 13.5 psi on gen 5 whipple stock bottom end. Dyno’d 900rwhp. Ran 14,000 miles, 30 passes at the drag strip. Yeah im lying lol. Thanks for the video

[@timbrwolf1121]

How do you not have more subscribers holy shit. I know where I am going when I step into a 6.4. Not planning on doing anything aside from cam and lifters to my 2015 Ram 5.7 1500. Its my daily and has to drive through winter. So I intend to trade out of it for a 2500 4x4 and build my 95 dakota into the street freak. The 95 dakota will be getting a 5.9 magnum and Nv4500 eventually. I'm planning to get it stroked up to 408 with a tremec 6 speed in the end

[@johnparts3405]

Donovan thank you for the kind words. Share and help me build an audience.

[@barnun2525]

I just bought one. So anxious to see what u do so I can follow.

[@tommiller8714]

New Sub here. Nice work, thanks for posting the video. Without question, the 392/6.4L Scat Pack engine are fairly well optimized by the Dodge Powertrain Engineers for normally aspirated performance, emissions and warranty reasons. And fuel economy too (although most of us, myself included, don't purchase Musclecars for fuel economy, although decent mpg for power level is nice). For me though, and I tend to over-engineer my cars (& Harley motorcycles). I would buy a set of "drop-in" upgraded, forged pistons & rods, hand-file rings for boost, perhaps lower the static compression of 10.9:1 (6.4/392) to 10.0:1 (possibly 9.5:1), and then do the wrench time. Possibly change out the Cam for a boost friendly design, Hellcat Oil Pump?, perhaps other upgrades (or obtain a 6.2L H/C shortblock?). I'm just overly concerned concerned about failures (& related expense) and want reliability, specially on a daily street muscle car. Looking forward to more videos. Thanks! Tom M., Hawthorne Ca. '21 Challenger SP/WB, 392/8A.

[@johnparts3405]

This was to show what can be done on the stock parts. I have plenty of well built forged engines I could post.

[@derekwinters3213]

This is dope I’m definitely gonna do business with you guys!

[@robertburns2917]

I learned this on the “cruise the coast” cruise we just did to maine this past Saturday with over 50 cars, and a guy had a 14” SRT8 procharged challenger and told me it make 600 to the wheel and by the way his tires looked, I believed him because they were his own drag radials 😂 he made from so many burnouts, 20k miles in with no problems he said, so yeah it can

[@darylduffy4911]

Thanks for the video. I have a 70 Cuda with a stock 6.4 and a Mopar Performance plug and play ecu set up. I would like to ad a supercharger but am also worried about the pistons. Looks like you found a safe way of accomplishing this task. The questions I have are: 1. Should you run a meth/water injection to keep temps down? 2. If I plan on only running 6lbs of boost, is there anything else I should be doing to protect the pistons/engine? 3. What type of tune would you recommend running to stay safe? Something more fat? What kind of timing? Seems like the timing and fuel ratio are the most important aspects of the tune to keep things from blowing up. I appreciate your time and the information you have shared.

[@OBIfrmMEM]

i think i might have found my build guy .....

[@johnparts3405]

This car is for sale

[@sassyquin707]

I’ve often thought of nitrous for its cooling effects.

[@bigk5746]

Wouldnt a centrifugal blower also be safer? Im really considering getting a 1320 or a Widebody Scat and doing a procharger. I have a procharged 2020 Mustang GT, makes 730 to the tire, but really want a challenger

[@milaperegon2787]

What size noozle you are using for water injection kit? Nice ride

[@sub_zerotv3877]

6.4 pistóns are made of glass 😂😂😂

[@plap.]

it's a pain but it is simple, ring gap, ring gap, ring gap. Tuned low boost and short runs, the motors are stout and will last. up it some add boost and poor tune abuse will break shit and it's not the motors fault. Every one blames a weak motor components diagnoses. The truth is rings touch when hot and break the piston. Don't even have to buy parts but once inside the engine every one decides to beef up components. Doesn't save time but it does money. Every one gap your rings. Only cost is a file.

[@plap.]

@Jason Davis doesn't have to be a new car with warranty someone doesn't want to pull apart. They could have picked up a junkyard motor and it's getting tossed into something or an old ride that someone wants to hammer on for fun on it's last horah. No it's not ideal but lots of people don't have the money to do it right and want it bad. The difference between survival or destruction check the gap and lower compression. In a perfect world do everything perfectly, but it's not a perfect world and neither are people. It is the most common damage from stock motor with boost adders. Broken pistons that take out everything else. If you don't want to worry about longevity leave it stock

[@marvintiscareno7966]

Also in stock scat pack you can run e85 whit out tune i just started 25% e85 then 75%91 then 50%e85 then 50% 91 last 100%e85 since 2016 to 2024 no check engine light I make more hp I race other scat pack I gap them like 1 and 1/2 car whit out tune

[@johnparts3405]

@@marvintiscareno7966 you’re making power because your running it lean. It won’t last long without a tune and larger injectors.

[@SheepDog0714]

Thanks for the information. Here is a little information for you. You are displaying your American Flag incorrectly. it should be hung where the stars are in the top left corner. They are always in the top left. Unless you are displaying it in a window for others outside to view it, then it will be hung where it has the stars in the top left for the viewers in the street to see correctly.

[@johnparts3405]

Was hung in the building when we moved in.

[@ReidPerformance]

Great info here I have been following Defier since they started with the hellcat swap and making it all possible and actually doing it successfully more than once. I have some questions .. is there a way to contact you?

[@Ian-xw1ge]

Dude where do you work at with your team? I have a 392 Hemi . Looking to do the same thing but need help? Nevermind. I are in my neck of the woods. I work in Alsip ILLINOIS

[@johnparts3405]

Cary Illinois

[@brandonUwanawich954]

If I was gonna go this route I might as well put it forge piston and rods I don’t wanna only stay at 6-7psi and only make hellcat numbers to be honest I don’t know why everyone installing boost but stock rods n pistons

[@johnparts3405]

Because everyone doesn’t always have the extra $ to build the bottom end right away but want to enjoy the extra power.

[@plap.]

Not glass, it's ring gap. Stock components do fine if rings are gaped pistons won't break. No piston can withstand the closed gap with nowhere to go

[@IhateYoutube]

6-7 PSI on a 392 is fun.... I know there's way more I can get out of my engine but honestly I've not been real inclined to yank the block out and go for more boost... :)

[@blackskimasklife9778]

Just a question... If my 3.6 can handle boost, why wouldn't a 6.4 be able to?

[@johnparts3405]

The 6.4 is a very different animal than the 3.6. Dodge tried to max out the 6.4 for N/A performance and emissions friendly tail pipe emissions. Because of that they moved the top piston ring very high up the piston and it makes the area right above the ring very thin so if you get a tiny bit of detonation or run super high cylinder temps it can bind the top ring in the cylinder and it breaks off the top of the piston right where the fly cuts are for valve relief.

[@bradlybaldwin9564]

F body and corveguys 24 years ago were already boosting factory long block engines

[@bossstrick]

I have an idea here how about the only people that can comment on super charging a scat are the ones who actually have it done !! Really don’t need anymore opinions on this one just facts

[@JarrodCarchio]

Have you been running the snow performance injection kit from the beginning even on the 2.4L? Looking at adding a Magnuson 2.3L supercharger with 6 lbs boot max. Thoughts with a mild tune?

[@IhateYoutube]

2011 SRT8 owner here, been running a 2.3L Magnuson for six years and 40 thousand miles at 6lbs. Just a few months back I shocked the living heck out of a bone stock widebody Hellcat when I was beside him in mexico. Tuned by AJ HemiFever with a safe street tune. I don't even think it's the slugs that are the problem. Yes I know the top ring land is "thin" on the 6.4 slugs and that they're Hyperutectic. But from everything I've seen and read over the years the problem is the stock ring gaps are too tight for the high cylinder temps and when you bottom out the rings then the tops of the slugs come off. Problem is no one with a stock bottom end wants to yank it apart to loosen up the ring gaps. Because "well if you're in there" might as well throw some Mahale billet pistons in the holes right? I have kicked around adding a Snow Meth setup before.

[@crowkangi]

any more info you'd add?

[@IhateYoutube]

@crowkangi like??? Added more in your other post. Wasn't sure what info you was looking for.

[@Sonny1989]

I’m at 12lb boost just hit 150k miles

[@juanrocha6156]

Longevity? And would you be able to buy the kit get it sent and send remote tunes to see ideal numbers stock block just jlt Cai, Last question and would i need to purchase intercooling system to keep 6.4 cool like you've done

[@johnparts3405]

We have kits that have shipped around the country. Www.defierperformance.com for more information

[@johnparts3405]

As far as longevity I have 39,000 miles on the car featured in this video and I beat it daily. I put about 700 miles on it a week and I do some street play too. Hellcats don’t know what the hell happened when I leave them sitting

[@raycaraway3230]

@@johnparts3405 the Hellcat owners don't take kindly to a lowly Scat pack walking away from them. Seen it many times.

[@martin1234512345]

Ill never understand why people are scared of drop in pistons and rods.... not that big of a deal.

[@H3LLHWK-LOAI]

I have dodge charger scat pack,how much you will charge me to supercharge it and where is your location? Thanks for your video

[@johnparts3405]

Our packages start at $12,500 installed and tuned we are located in Cary Illinois. Visit defierperformance.com for more information

[@bradlybaldwin9564]

And those were aluminum blocks not iron

[@marshalllapenta7656]

They don't want people tuning the 392.....

[@srtfreeza3277]

Where do I sign up💯

[@johnparts3405]

Www.defierperformance.com

[@mikew6135]

Add ring gap. No problem with some boost

[@Gdesign959]

Might as well put pistons in it if your going in.

[@johnparts3405]

I added ring gap to my car I’ll have the results on stock pistons with 14 psi once my fuel system upgrades arrive.

[@Gdesign959]

Sweet let us know.

[@partainbanner]

What octane gas? This is what I've been debating about all week. I have gotten a quote from national speed for 24,000 for the built motor with the gen5 3.0 wipple, or just the wipple for 12000. Im not wanting to be the fastest car so I would be thrilled with 650 whp!

[@johnparts3405]

For 650hp I’ve done it on 93 octane pump with a hellcat stage 2 snow performance water methanol injection kit

[@americanassassin001]

Here is the sad part my dude for that 24000 you could have a 6.4l Gen4 BGE Apache based engine from A company called Late Model Engines that's built for up to 1800hp and it's built for boost same build was done for.the SGT Smash charger built by speed Society's give away of a 1200hp daily driver.

[@cantcme1243]

I just boosted my '18 Challenger Scat Pack earlier this year P1SC1 Procharger she's got 6 pounds I'm running, so far so good..I did go up against some of the high cars on the roads and they were shocked when I handed their ass to 'em!

[@johnparts3405]

I love sneaking up on hellcats

[@gabrielomalley6266]

What else besides procharger did you add to motor? Or procharger on stock motor?

[@cantcme1243]

@@gabrielomalley6266 Kooks long tube headers, 87 mm TB, Borla Atak exhaust, Diablo tuned,20inch Demon black gloss rims, 9.5 front and 11inch rear & Continental sport tires 275 front and 305 rear

[@truedetailz1468]

Update ?? Did you do anything with motor ??

[@patrickciarcia4100]

Very cool 😎

[@richardjones990]

Are hypereutectic piston's installed in the 6.4?

[@johnparts3405]

Yes from the factory. We use to throw 15 psi at hyper pistons. You just gotta keep ‘em cool

[@Gdesign959]

Pretty much every car has them. The 6.4 has other problems though. The ring gap is not only tight but the rings are very high on the pistons. The rings heat up and expand until the ends are forced together. They can be forced together so hard and with so little of piston above them it pops the piston and takes a big chunk out of it and that’s all she wrote.

[@392_leo_4life]

Wanna work with you on my challenger scatpack. how can I contact you. I live in Florida

[@SantosMorin]

@johnparts3405, if you had to chose a Supercharger for the 6.4 which one would you pick? Procharger, Whipple, or Magnuson?

[@johnparts3405]

Great question. I prefer Whipple out of these 3 choices

[@williamhartwell9160]

So you’re telling me if I want to get a jeep srt grand Cherokee with a 6.4 put a blower on it and have the equivalent to a track hawk

[@johnparts3405]

Actually yes

[@Castor1989]

What do you think about running a hellcat supercharger on a 5.7 converted to a 396 stroker with forged internals? Also how much boost would be safe of this application?

[@johnparts3405]

Already done that. I have a 5.7 that makes 823 to the tires at 14 psi

[@md_ready]

6.4 pistons made of glass LMBO!!! Yeah mopar could have made those pistons a little stronger!

[@johnparts3405]

Agree

[@bossstrick]

Then you’d of been able to make a hellcat for a lot less money than buying one. Dodge wasn’t stupid $$$$$

[@md_ready]

@@bossstrick you have a point lol!

[@johnparts3405]

Exactly my friend. I’ve got another video coming that’s a second part for this about a few things I’ve been finding on my 6.4 tear downs be sure to subscribe and it’ll be posted soon. Should blow some minds and make some people really salty about their skills lol.

[@md_ready]

@@johnparts3405 lol sounds good!

[@sifudan9244]

just purchased a 6.4 2500 ram i believe they have different internals ?what can i do safely to upgrade my motor

[@SRTBOAT]

What kind of psi limits did you see on the 6.1 when you tested those cars? Mine is at 7psi right now and I'm not sure where the breaking point is.

[@johnparts3405]

6-8 on the 6.1 but others have pushed it higher with E85 or race fuels

[@SRTBOAT]

@@johnparts3405 Is there a certain power level where I should be forging the pistons/rods? I'm making a little over 500 wheel right now.

[@LuisVasquez-pl9wx]

Can this be done to my 6.4 Ram 2500?

[@johnparts3405]

The ram has a egr cooler under the intake that needs to be deleted so it would need to be for off-road use only at that point.

[@sssideshows9712]

Does anyone know a good tuner in California? Preferably in norcal

[@224jukke6]

5.7 pistons are better then 6.4 pistons ?

[@Alwayz_Angry]

Both can be boosted just Fine

[@johnparts3405]

The 5.7 has less static compression than the 6.4 so here is where I’ll drop some free knowledge on the audience. There are 2 schools of thought on boost with pump 93, you can go high boost low compression or low boost high compression. The 5.7 is 10.5:1 compression and the top ring is located lower on the piston because it’s allowed more nox emission compared to the 6.4. The 6.4 has 10.9:1 compression and they moved the ring up the piston to prevent to much nox caused by the extra fuel needed for the higher compression. On a 5.7 to make 600hp it takes 10 psi of boost which is a 270hp bump over the 330 wheel we usually see on the stock 5.7’s On a 6.4 to make 600hp it takes 6 psi of boost which is a 170 hp increase over the 430 we usually see on stock 6.4’s So why did I tell you that. To answer your question the 5.7 piston is better in my personal opinion because it can handle more cylinder pressure than the 6.4 at the same rear wheel horsepower number.

[@amanueldior275]

What pistons and rods do you recommend on 6.4?

[@johnparts3405]

Flyin Ryan Performance has great drop ins for the 6.4!

[@crowkangi]

any thoughts at what psi you could run with forged pistons? and what you you upgrade next to handle it.

[@IhateYoutube]

If you upgrade to Mahle Forged Pistons and Molnar billet rods and assuming your fuel system is upgraded as well. Then you can run 12-14lbs. I would also upgrade to all ARP Studs for the bottom end and head studs and would also add an ATI balancer. While you're in there might as well get the heads CNC ported and get a custom blower cam. Also going to need to custom dyno tune it all.

[@crowkangi]

thank you. great info@@IhateKZbin

[@IhateYoutube]

@@crowkangi You're welcome

[@johnparts3405]

I’ve done that on several and we make well over 800hp on those with upgraded main and head studs with good rods and arp bolt

[@osvman799]

I have a 2018 T/A 6.4 6 speed manual. Going to upgrade the internals but CAN I run everything else stock? Thanks guys

[@idivizionz-4589]

I got a question does a 6.1 take more boost than the 6.4

[@johnparts3405]

Not really. Piston design is very similar. We have just had more time to push the stock 6.1 piston to the edge

[@nickwilliams8133]

How much wld u charge to fix mine like that

[@johnparts3405]

This kit with install is right around $12,500

[@nickwilliams8133]

R u willing to fix mine?

[@shaneonews6791]

The bottom end is not as strong as the 6.2. As well. The 392 was made for n/a .

[@johnparts3405]

How many have you personally supercharged? I’ve got 73 under my belt to date I think I know what I’m doing

[@hemanzman2507]

Man wtf was that goofy ass intro.

[@johnparts3405]

@@hemanzman2507 old business partner was goofy and had it made. He’s gone it’s no longer being used you want it?

[@Jeff-ej4wp]

6.2 supercharger fits on the 6.4 without any mods?

[@johnparts3405]

With the Defier Performance Hellcat supercharger adapter kit it fits!

[@demodemoncrat441]

Do you guys only do superchargers? I'd like to go the twin turbo route because then I'm not putting the extra strain on the motor to compress the air, and having to overcome the initial HP drag on a SC.

[@johnparts3405]

We have built some turbo cars in the past yes. Working on a twin turbo 426 stroker at the shop currently should be ready before the end of the year we hope.

[@demodemoncrat441]

@@johnparts3405 On a completely stock set up, is a Hellion TT set up at 6lbs feasible and safe? Is there any upgrades that would need to be done, like fueling?

[@americanassassin001]

If.you.want.to know why the 6.4 doesn't handle boost well its all because they don't have forged internals. Change the crank and the cam and forged lifters and rods and valves with upgraded valve train. Better heads like the Edlebrock gen3 hemi heads ported and polished is where I would start building if I were building it. Anyways the biggest problem lies.with the pistons themselves and when people dont.u derstand why it's because the stock pistons in that engine are hyperutectic pistons which that type.of.piston doesn't hold up very well especially when it comes to adding boost to you application. You will need better everything all the way down to studs nuts and bolts and the you can make that engine a fucking HP monster that will walk every hellcat and demon out there.

[@johnparts3405]

The 6.4 has a forged crank from the factory. What sir are “forged” lifter May I ask?

[@I9Warefare]

Hey man do you email tunes?

[@johnparts3405]

Email [e-mail]