I posted a few weeks ago about what is the true HP of the lz9 motor. There was not much information given on this. other members that have race or time there cars are coming up with pretty good numbers. Some that have given there numbers are around 6.6 , 6.9, 0 to 60 and 14.83, 14.91 at around 94 mph in the quater mile. Like chevy posted 242 HP, again i ask did chevy tell a little white lie on theses numbers to help keep INS. rates down.The car does pull pretty dam strong, i let my buddy drive my 3lt and ask me what size v8 the car has. When i told him the motor size he was taken back a bit. He owns a 1996 trans am with the lt1 motor rated at 275 HP.He thinks if we race it could be neck and neck. Like i said, buick lie about the 86 GN saying it had 220 HP when the real HP was 280. Could the 2006 ltz be more like 260 HP?

 

I wonder if anyone ever dyno'd one.

 

I have the 3.9 and that car is fast as hell I love it

 

I have the same, can't say there is anything that it has that makes it out of the norm...It's a good runner, but I doubt there are any hidden #'s on hp with it........

 

With the LZ9 its the torque and how fast it creeps up in the RPM's that makes it the mean V6 it is IMO.

 

yes, this motor being a v6 is one bad ***. i had my friend time me from 0 to 60 this baby rip off a 6.7 to 60 not bad at all.Like i said before, one member on this site use a g-tech device and got 6.6 to 60.

 

Go read my reply on your other thread. I've driven a 3.9L and I've also driven both the Series II and Series III supercharged 3800s and I gave you a good comparison. Reason I compared is because I've seen many stock L67s and L32s dynoed and I know that those numbers are pretty close to accurate.

 

I honestly believe that the numbers are just about spot on for the 3900 Monte's. Think about it this way. The Monte with a 3900 weighs roughly 3400lbs (give or take) and is claimed to make 240hp. A 97-03 Grand Prix GTP with an L67 weighs about the same and is claimed to make the same hp. The GTP on average will run about 2 to 3 tenths of a second faster in the 1/4 mile (roughly a 14.6 give or take). This demonstrates the L67 superior torque over the 3900's (280 ft lbs compared with the 242 ft lbs from the 3900).

As far as the TA with the LT1, they typically ran low to mid 14's in the 1/4 mile, so again it's about spot on hp wise. Don't take a lot of stock in 0-60 times either. Someone can accelerate to 60 fast, but they might not cover much ground therefore the car could be slower. 1/4 mile times are the most accurate way of finding out how "fast" a car is because it shows how fast a car would cover a certain amount of ground.

I did do a quick search to see if I could find anyone who has dynoed a 3900 car, but came out empty handed. Where are you located Bob? You should see if there's a dyno shop near you. If you dyno around 190-200whp, then GM's 240hp is right on. Without a dyno, you have no case for the 3900 v6 being underrated, especially since they are running predictable times. A second slower in the 1/4 mile is a LOT slower, nothing abnormal there at all.

I will say this though, the 3900 is a cool engine, and I would be proud if I owned one. I wish there was a larger aftermarket for that engine because I believe that it has a lot of potential.

 

I pretty much just drive my car, nothing serious, but how do you dyno a car and how much would it cost? I'll ask a few guys at work tomorrow and see if there are any places around, I might look into getting it done......

 

Basically what happens is you make an appointment at a shop for a dyno pull. Prices vary GREATLY from shop to shop, so it all depends on where you go for prices. I've found that ZZP is one of the cheapest places to go to. Everytime I've gone there, they've charged me less then $150 a session (3 pulls), and that's with PCM tuning as well.

Anyways, once you get to the shop they drive your car onto the dyno and strap it down. Then they hook up a few wires to it to check the afr and rpms (maybe a couple other things too, can't remember right off the top of my head). They then hook up a computer to your car via the OBD-II port, warm up the car and then start with the dyno pulls.

Here is an example of a dyno from when my Monte was NA video's:

222WHP 1998 Monte Carlo Z34 - YouTube