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  1. #1
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    Challenger gets 6.4 liter 475 hp motor

    Seems this means the new Jeep SRT-8 will be around the 500 hp mark:

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    392s are solid motors, speaking in terms of what the aftermarket has done with them. 426s are too much of a stretch, literally, rod angles are not good and the slugs come too far out of the hole at BDC--they wear quickly and simply won't last if mileage is a concern. Race only you're ok.

    Anyway the new 6.4L is simply a stroked version of the 6.1L (22CI larger) bore remains the same. The Mopar crate and aftermarket 392 motors were using the same intake manifolds the 6.1Ls used which proved to be the greatest restriction even in a 6.1L app--too much runner length.

    I haven't checked with my local parts dept but I don't think they changed the heads/manifold, but they may have gone with a slightly larger yet still very mild cam.

    More inches from the factory from a N/A platform is always a good thing, especially when rpm isn't compromised. Good stuff for the new Hemi guys.

    Historically speaking the Jeep SRT8 model has always put out less power than the other SRT8s simply because of a more restrictive exhaust for the SUV. The 6.1Ls had 3 into 1 manifolds (sad but true) as the last two cylinders were merged in the cast iron manifolds.

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    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    Historically speaking the Jeep SRT8 model has always put out less power than the other SRT8s simply because of a more restrictive exhaust for the SUV. The 6.1Ls had 3 into 1 manifolds (sad but true) as the last two cylinders were merged in the cast iron manifolds.
    This is true, but the AWD makes them an interesting platform. There have been rumors that the new one would get over 500 hp however, so it may get more development in that application.

    I would like for the SRT-8 to be able to tow this time around.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    This is true, but the AWD makes them an interesting platform. There have been rumors that the new one would get over 500 hp however, so it may get more development in that application.

    I would like for the SRT-8 to be able to tow this time around.
    The rumors I heard were that the 6.4s would be over 500hp initially which dropped to the 475 level we see published now. If they can fit an exhaust at least as good as the LX/LY platforms in the former ML chassis it's possible.

    Lack of ability to tow mainly due to the center mounted exhaust was a HUGE issue for Jeep SRT8 owners, even though they were rated at 3500lbs you couldn't tow squat without a custom hitch. I expect that issue to be addressed in the new model.

    I miss my M5 the most but the Jeep wasn't far behind, it was a great all around vehicle and from stoplight to stoplight it was a monster. For the $ the last model was a great buy and the new one seems to be all that and more. Very fun and inexpensive daily driver--less the horrid fuel economy that numerically high gearing, AWD, 4800lbs, and brick like shape provide Click here to enlarge Jeep SRT8s reclaim the carbon footprint that Prius owners proclaim they save.

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    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    Lack of ability to tow mainly due to the center mounted exhaust was a HUGE issue for Jeep SRT8 owners, even though they were rated at 3500lbs you couldn't tow squat without a custom hitch. I expect that issue to be addressed in the new model.
    This has to be, it limits it as the do everything car. If they fix this, I'll be interested. The perfect tow vehicle for me.

    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    The rumors I heard were that the 6.4s would be over 500hp initially which dropped to the 475 level we see published now. If they can fit an exhaust at least as good as the LX/LY platforms in the former ML chassis it's possible.
    Is it really just the former ML Chassis? If so, that is really disappointing. That car never had good driving dynamics.

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge

    Is it really just the former ML Chassis? If so, that is really disappointing. That car never had good driving dynamics.
    It's changed (ML Chassis) in the same ways the W210 E class was modified to suit the LX and eventually LY platform SRT8s. There are changes for the better but no question no ML ever approached what an X5 felt like handling wise. Jeeps Gen I SRT8s handled fairly well, actually it stuck like glue, due to fat meats and AWD but rolled too much in corners for me. I had one for about 24k miles and also had the chance to drive the infield at Daytona with them along with the '08 Viper at a press release (for the then new viper) event held at the track. Compared to a ML63 the Jeep had a better suspension setup (Bilsteins all around with SLA front and 5 link in back) and once the run flats were gone it felt better all around than a ML63--at least IMHO.

    I believe the new SRT8 Jeep will handle very well considering what Chrysler did with the WK platform versions, kind of like what Ford did with the new Mustang GT--the platform isn't world class (S197 is a huge step up from the SN95 however) but they made the best of what they had. The new chassis is a huge improvement over the WK so I expect it to handle much better than it's predecessor, they really spent time dialing the old platform in and will again I think.

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    Other complaint was the interior, while the seats were actually very good for a SUV the interior was spartan and plasticky to say the least. The newer version will address that as well I believe. If they keep it around $50k nicely optioned I will also most definitely consider picking one up for a DD.

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    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    Other complaint was the interior, while the seats were actually very good for a SUV the interior was spartan and plasticky to say the least. The newer version will address that as well I believe. If they keep it around $50k nicely optioned I will also most definitely consider picking one up for a DD.
    I was thinking more in the 40's? Is that not right?

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    I was accounting for a price bump due to the nicer interior and a new model, but mid 40s used to be sticker on a loaded one. I believe they got up to $48K ish with the later models which had more options (factory HIDs, heated rear seats, etc).

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    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    I was accounting for a price bump due to the nicer interior and a new model, but mid 40s used to be sticker on a loaded one. I believe they got up to $48K ish with the later models which had more options (factory HIDs, heated rear seats, etc).
    I see, well I hope they can keep it in the 40's.

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