Those 3.9L V6 sounds impressive... - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-10-2006, 11:34 PM   #11
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Quote:
Originally Posted by Technical Ted
Quote:
Originally Posted by sandrock
I have the 3.5 variant. The new 3.5 and 3.9'* are modernized 3.4'*. Both are drive by wire. I can tell you that my 3.5 is very quick compared to the 3.4 I had in my Monte Carlo, very responsive and feels like it has alot more torque in the low end. But the exhaust crossover pipes are way too small for it, and hopefully I can find an exhaust shop that will remedy that for me when my car goes out of warranty. Other than the size difference, the 3.9 also has a variable intake manifold and has the DOD system, and can be found in the Monte Carlo/Impalas and the Malibu SS (which I hope to be getting at the end of the year).

I thought the 5.3 V8 was the only engine that had Displacement On Demand. Does the 3.9 really have it?
They have yet to find a way to give the V6'* DOD and have them run smooth... But I'm sure if GM wanted to get some more MPG'* out of the 3900, thy could throw the tall 2.83 gears at it... Some of the 3400 impallas even in 00 were rated for 32 Highway... I'll bet if you keep your foot out of a 3400 in an impalla 35 mpg would be easy to comeby

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Old 05-11-2006, 08:33 PM   #12
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Quote:

I thought the 5.3 V8 was the only engine that had Displacement On Demand. Does the 3.9 really have it?
I think only the ones in the Monte Carlo and Impala have that feature, or at least was in the works. They do have the variable intake and rudimentary (compared to Japanese engines) VVT. And yes, the previous motors are HIGHLY bottled up. My Monte Carlo had the 3.4 and when I put dual Flowmasters on it, not only did it sound so much better, it got about 35 mpg on the highway. Gotta love that!
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Old 05-11-2006, 10:03 PM   #13
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I looked at Chevrolet.com & they only show DOD on the 5.3 V8. So just the SS versions of the Impala & Monte would have it.
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Old 05-11-2006, 10:34 PM   #14
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I really don't think that DOD is that practical anyway. It only works (I think) on very flat or downhill roads at certain speeds.

But anyway, the 3.9L is very interesting. Some has driven the SS Malibu, some in the G6 GTP. But what about a Impy? Or a MC? Anyone driven a LTZ version?
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Old 05-11-2006, 11:29 PM   #15
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hah, that is funny, a few days ago i was gonna post about this engine and i guess someone read my mind...it seems impressive, i just gotta go find the time to go test drive it...sounds fun to me! I can't believe it is N/A and puts ou that kinda power...that thing puts our engines to shame. The only think I don't like spec wise is that it does not exactly have the torque it should...maybe that is because it has more than 2 valves per cylinder...or does it? I forgot. I think it has 2 but in most cases that does seem to affect torque. Maybe...
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Old 05-12-2006, 12:48 PM   #16
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Its a Pusrod 3.9 a.k.a. 3900 V6.... Its is a version of the Chevrolet 60* V6... 2 Valves per cylinder

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