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  #1  
Old 06-07-2011, 02:34 AM
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Turbo for Pentastar?

So if you quickly google "pentastar turbo" many results come up. Based upon what I read Chrysler is designing and planning on producing single and dual turbo pentastars. Most of the articles say that it will be done on the 3.0L variant and not our 3.6L, and that they are intended for vehicles such as a new Maserati sedan and a future viper.
I am not a true car guy at my core so I don't know the chances that a turbo could be fitted on the 3.6L. Anybody have any thoughts on this?
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Old 06-07-2011, 02:59 AM
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Re: Turbo for Pentastar?

you can turbocharge any engine...pretty much. It was in the longterm plans when ChryCo was going into/emerging the bailout a couple years ago. Search the early days of the wk2 forum...there is some articles I posted there about FI and the 3.6.
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Old 06-07-2011, 03:17 AM
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Re: Turbo for Pentastar?

2011 Grand Cherokee- V6 single and twin turbos coming
link to said thread for those interested. Sorry for the dupe didn't see that back that far.

However, that is exciting. I would love to TT my 3.6, make it a true sleeper, and dust unsuspecting fools.
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Old 06-07-2011, 03:43 AM
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Re: Turbo for Pentastar?

No hating, but seriously, if you wanted a fast SUV, you'd have been better served buying a Hemi or the upcoming SRT Jeep.

Adding forced induction (esp turbo) is a time consuming and money intensive project to do well and reliably, and choosing a base engine to make a performance engine of doesn't really make much sense, because you have a lot of work to do JUST to catch up to the more performance orientated engine/s you could have bought for just a little more money.
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Old 06-07-2011, 05:07 AM
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Re: Turbo for Pentastar?

I hear what you are saying. I am not looking at this to seriously, just seeing what everyone else knows/thinks about it.
I specifically did not get the Hemi(shudder) or overland(quadralift problems) because of some of the issues I have read so much about on this forum.

Between the twin turbo six(335xi) I have driven, and my old V8(mustang GT) i prefer the six, just my opinion.

My other questions are whether the transmission, transfer case, and other drive line components could handle the increase in HP and TQ. I enjoy truly making my vehicle unique and this seems like something that would make it quite awesome.
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Old 06-07-2011, 08:12 AM
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Re: Turbo for Pentastar?

I'd imagine the driveline could handle the torque. IIRC, the transfer case is the same as in the Hemi, and the transmission's name tells it's rated strength (W5A580... can handle 580 Newton Meters of torque, which is 427 ft-lb... the current Pentastar puts out about 260 ft-lb, so there's clearly more capability than we're using).

Still, while we could turbocharge the thing, the question is as Marlin says; we'd end up going to a lot of expense only to void the powertrain warranty, end up with computer control that is iffy since it wasn't intended for this, and we'd end up with no more power than the Hemi would have provided.

You'd also have to make sure the engine internals could handle the higher pressures in the combustion chamber; this thing is not a super high compression engine, so new connecting rods and head gaskets might be required if you're going to do anything other than a pretty light pressure turbo.
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Old 06-07-2011, 01:01 PM
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Re: Turbo for Pentastar?

They will not simply add a turbocompressor to the Pentastar, they will review the complete engine to let it survive with the higher loads the supercharging implies. This means several new components (pistons, heads, gaskets, etc.. dependind on the weakest areas of the Pentastar). You can add a turbo to any engine, but the result is not always good... so forget to do it on the GC unless you are ready to loose reliability.
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Old 06-07-2011, 01:30 PM
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Re: Turbo for Pentastar?

Quote:
Originally Posted by bart69 View Post
They will not simply add a turbocompressor to the Pentastar, they will review the complete engine to let it survive with the higher loads the supercharging implies. This means several new components (pistons, heads, gaskets, etc.. dependind on the weakest areas of the Pentastar). You can add a turbo to any engine, but the result is not always good... so forget to do it on the GC unless you are ready to loose reliability.
I'm pretty sure from what I've read on the new pentastar engine that it can and will support moderate levels of boost. I would feel confident in putting up to 16-18psi. Stock trans and transfer case would be good for the torque as well.

I'd wait to make any mods until a tuner cracks the new bus and can support engine monitoring and tuning.
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Old 06-07-2011, 01:39 PM
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Re: Turbo for Pentastar?

a tuner is the key; if it cant be tuned you can strap on 10K extra horsepower and go nowhere/
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Old 06-07-2011, 06:27 PM
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Re: Turbo for Pentastar?

great discussion guys.....keep it coming! IMO...coming from turbocharged vehicles....the higher compression 3.6 could handle 5-8 pounds of boost easy. But like others have said...the tuning is the key.
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Old 06-07-2011, 08:05 PM
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Re: Turbo for Pentastar?

Yeah I'd certainly be suprised if the 3.6 could handle any more than 10psi reliably. Certainly not in standard form. You would definately run into issues with piston crown strength, and likely conrod strength too.

There is also likely a reason they're planning to de-stroke and reduce the bore for factory turbo applications, on alloy blocked engines, especially those with open topped blocks like this, can suffer failure of the cylinder walls. Hence, they'll keep them thicker (smaller cubes) to alleviate or minimise this issue.
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Old 06-07-2011, 11:51 PM
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Re: Turbo for Pentastar?

I am admittedly not very knowledgeable about installing a turbo, that's why i posed the question here. Seems like it would be a huge hassle. Better to just save my money and get a second ride, maybe something with a turbo inline 4 and awd. I do enjoy seeing the discussion as the last thread ended before the actual WK2 went on sale.
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