I have been reading alot about how fast the 06 3lt lz9 monte is. 0 to 60 in 6.62 quater mile at 14.83 at 94mph, so my queston is this,back in the day say mid 80s buick put out there 1986 bad *** G N. now buick told every one that the car had 220 hp, after all the testing was done it was more like 280hp. they printed lower hp numbers so you did not have too pay threw the nose on INS.So now i ask you did chevy tell a little white lie on the 3lt 242 hp? Is it possible that the 2006 monte carlo with the lz9 has 260hp not the printed 242hp?That is why the car was made only one year, it was running to close with the 06 & 07 v8.

 

While I'm not too savy with the LTZ, i'm pretty sure they didn't discontinue it for competing with the SS. 242 horse vs. 303 horse in a car that's designed/weighted to be identical isn't even a contest. I did a quick search and a stock LTZ runs around 15.5 while the SS runs low 14's if not high 13's. Also, engine isn't the only difference from an LTZ to an SS -- suspension and transmission are 2 big differences as well.

As far as reason for discontinuing the LTZ, my take is if you look at total Monte Carlo sales for 05 through 07 you'll see that numbers for the 7th gen weren't even half what they were the previous 4 years, thus the reason for discontinuing the monte carlo all together (i don't even think they made it the whole 07 model year).

 

The numbers are about right. 242 hp and 245 tq, that's a high 14-low 15 quarter mile time. Keep in mind a stock L67 car has 240 hp and 280 tq, and they run mid-high 14's all day.

And the only differences between the transmissions of any 6th gen are the differential and probably the gearing. They're all 4t65e.

 

Yeah, the numbers are pretty much right for the LTZ's. You're probably looking at 190-200whp, which is about the same as an L67, but the L67 cars run slightly faster times due to the higher torque. Also, running a high 14 low 15 second car against a very low 14 second car, is not a competition. If it were like a 14.9 to a 14.7 then that could be true, but otherwise they were fairly accurate on these engines.

The best way to know though is to take your engine out of the Monte and place it on an engine dyno and see what it makes, then you could compare that with the engine in the Monte on a chassis dyno. You would know for sure how much hp was lost through the drivetrain (I'd guess around 20-25% loss).

My question is, did you run your Monte at the track and run a 14.83? That's really good for a 3900 powered Monte.

 

This info. was posted by another member who use this info. using a G - TECH. device. If another member has any more info. on this please let us here from you. my 06 lt3 out ran an 03 gt mustang, was not even close, the mustang this gave up tring to keep up. Like i said, this car with a lz9 v6 can pull strong up to red line, has to be the vvt.

 

That's strange. An 03 Mustang GT should run neck and neck with an 06 or 07 SS. It's possible that the driver didn't know how to shift properly. The VVT does help the 3900 for sure though. They're cool engines and if I had a spare 5th gen LS, I would swap one in for fun.

 

that is why i queston the hp of this motor,my buddy time me at 6.7 to 60,another member use a g-tech device and turn i a 6.6 to 60. when you think about it, it is only 1 sec. off the ss to 60.I wanted so bad to buy the ss but the payments were out of my range, got the next best thing the 3lt. with the vvt motor it keeps pulling right up to the red line. To bad gm put in that dum *** speed limiter could only go 117mph, with a lot of pedal to go.

 

My Dale Jr was outrunning 4.6L Mustangs. But then again I was pulling as much torque than the first several years of the 4.6L and my L67 pulled a lot harder through the RPM band than the early 4.6s did. That being said, that 3.9 should have lost off the line due to the lower torque numbers. I chalk that one up to driver error. You may have caught him at higher speeds but there's no way that 3.9L is making almost 300 torque that you'd need to leave the Mustang off the line. Not in stock form.

For what it's worth, I've been in L67 cars, L32 cars, and 3.9L Cars. Both the 3800 motors are stronger overall, especially the L32. I doubt the published hp numbers are all that far off. If they were, it wouldn't be a substantial difference between that and the two high powered 3800s. And I can tell you from experience that both S/C 3800s get better fuel mileage as well.

 

Hi Sarge, you are right about gas mileage if you push the 3.9 a little in the city you only get about 16 mpg. as for the mustang driver i think he puy it in the wrong gear, but it still made me happy.