[Mach2]

I'm wondering if the 5.7, 6.2 & 6.4 Hemi's have the 3750 mile ECU restrictions that after that mileage go away? I have a 14 R/T Classic A5 auto trans that had this restriction. It's a good thing if they do because when I test drove a 15 Scat Pack with the 6 speed stick, I got on it real good. I didn't rattle the rev limiter though, but got close. I imagine most, if not all, folks that test drive a R/T with the 5.7, a Scat Pack with the 6.4 and the Hellcat with the huffed 6.2, test the acceleration like I did also.

 

[RWL11]

Only thing I heard of being restricted is launch control. Does not engage until after 500 miles. The 3750 vvt restriction, I do not know. P.S. an article I read said SRT cars are NOT speed limited. Different topic, but very interesting!

 

[mikeychallenger]

I've followed a few threads here on the subject and the consensus seems to be that the 5.7 does have that limitation (VVT won't use the full range) until 3750 miles. The restriction appears in some of the Chrysler scan tools. As for the 6.4, I don't think anyone knows. Some say they feel a difference. Others say not. But it's all conjecture on the 6.4.

Mike

 

[hdwrenchtx]

i never noticed a difference on my last 392 haven't got there on the 15.

i think it's BS

 

[wasp392]

A lot of 5.7 owner report that they feel the difference but very few 6.4 if any. I didn't feel it. IMO it only applies to the 5.7s.


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[MCO_Carter]

I've heard about this magic "3750" deal, but I've never seen any definitive proof of it. I'm at 3200 miles right now on my 6.4, so I'm sure I'll find out in about a week...but I'm not holding my breath.

IMHO - It's more than likely that after about 3750 miles (roughly 3 months of ownership depending on driving habits) one is more comfortable with driving the car, and displays more confidence in their skills behind the wheel of it, so they subconsciously drive it with a bit more "performance gusto" than when it was brand new. Again, just my opinion.

 

[timboo04]

I'm brand new with the challengers. So consider me pretty moronic. I bought my '15 R/T with manual trans monday. Could someone fill me in on these restrictions you are talking about. My R/T has almost 500 miles on it now. Launch control restrictions? Vvt restrictions?

 

[Coaxial Duck]

I test drove the '15 Scat Pack last weekend. They do have the ECU limitation you are speaking of. The SRT Specialist I drove with said they all have a 1500 mile limit that prevents you from redlining so that the engine can go through a break-in period (seating gaskets may be part of it, I'm not sure)

I confirmed this by going 0-50 in first gear, hit 50 just before redlining and the engine forced me to back off (happened very suddenly and difficult to describe). It was a 6.4L manual scat pack.

The scat pack is unbelievable, without that limit, you could very nearly burn someone 0-60 without even changing gears...

 

[Coaxial Duck]

I'm brand new with the challengers. So consider me pretty moronic. I bought my '15 R/T with manual trans monday. Could someone fill me in on these restrictions you are talking about. My R/T has almost 500 miles on it now. Launch control restrictions? Vvt restrictions?

Launch control may also be limited for some time when the car is new (I know it is for the SP but not other trims). I cannot remember the specifics of the conversation I had with the SRT Specialist.

 

[wasp392]

I test drove the '15 Scat Pack last weekend. They do have the ECU limitation you are speaking of. The SRT Specialist I drove with said they all have a 1500 mile limit that prevents you from redlining so that the engine can go through a break-in period (seating gaskets may be part of it, I'm not sure)

I confirmed this by going 0-50 in first gear, hit 50 just before redlining and the engine forced me to back off (happened very suddenly and difficult to describe). It was a 6.4L manual scat pack.

The scat pack is unbelievable, without that limit, you could very nearly burn someone 0-60 without even changing gears...

I think you're confusing the two. What you experienced was hitting the rev limiter. They all have it. Doubt you can you get to 60mph in first gear.


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[brandy16]

i never noticed a difference on my last 392 haven't got there on the 15.

i think it's BS

Your right its BS. I have a 2012 392 and took it to the track with 200 miles on it. It now has 15000 miles on it and when its stock, no tune and no DRs it runs just like it did with 200 miles on it. People want to believe this stuff so its real to them. If you didn't run the 1/4 with it before the magic number then you cant say its faster after reaching the magic number. So if you say its true show us your time slips.

 

[Coaxial Duck]

I test drove the '15 Scat Pack last weekend. They do have the ECU limitation you are speaking of. The SRT Specialist I drove with said they all have a 1500 mile limit that prevents you from redlining so that the engine can go through a break-in period (seating gaskets may be part of it, I'm not sure)

I confirmed this by going 0-50 in first gear, hit 50 just before redlining and the engine forced me to back off (happened very suddenly and difficult to describe). It was a 6.4L manual scat pack.

The scat pack is unbelievable, without that limit, you could very nearly burn someone 0-60 without even changing gears...

I think you're confusing the two. What you experienced was hitting the rev limiter. They all have it. Doubt you can you get to 60mph in first gear.


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Yes, I see now what you are saying. I reread OP's post - I believe you are right. I cannot help with the original question it looks like.

That is still a very impressive 1st gear. Better yet, the SP feels just as incredible cruising around at low speeds. It's simply awesome to drive at any level of speed in any scenario on the road.

 

[JeepXLC]

i've been waiting on 3750 since i got the car. i finally hit it wednesday night.

my "real world testing" is that since about 2,000 miles i've been trying to perfect the launch of this car. the drive by wire makes it finicky compared to what i'm used to. i seem to have finally got the launch figured out, a tiny bit of wheel spin seems to get me the smallest number on my stp timer compared to other tricks i've seen with 2nd gear launches and clutch feathering. but i've been having a hell of a time breaking 5.8 on my 0-60... which could mean i'm a crappy driver. i dunno. i haven't been able to find other people sharing their numbers on their 5.7 m6 so i have no idea how good or bad i am. but it certainly wasn't for a lack of trying.

then i hit 3750 miles. and it wasn't like a light switched on as soon as the odometer turned over. i hit the magic number wednesday night and took a long detour home to see if i could feel where the power was added. i didn't feel much right then but thought maybe i picked up a little mid range? so i wrote it off as a placebo effect. then the next time i started the car i really felt it. it was like the difference between a warm day and then there was cool dry air the next day. it definitely felt like it woke up.

so on friday night, on the same stretch of road i've been doing my 0-60 times on. the same place i set my best of 5.8... there was no traffic, so i stopped, let my timer say it was ready. and then launched it the best i could.

5.6 first attempt right out of the gate. that's a 0.2 second improvement. i had a good launch, sure, but it wasn't any different than my other good launches. the car just pulled harder through the gears.

it's certainly enough to convince me that the 3750 miles thing is legit. i was at almost 3800 when i did my launch.

 

[Radride]

Many people have dyno'd their 2015 392's right when they got them. They were putting down around 430 rwhp. If this elusive 3750 thing did exist, you'd see it on their dyno charts. Nothing out of the ordinary was ever noted.

R.K.

 

[wasp392]

It was never proven the 3750 mile thing on the 392s. But it does exist on the 5.7s. There're also many stock pre 15s that were dynoed around 430.

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