RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : )

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RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : )

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Monte Carlo Forums >> Racing / Recreational >> Street and Strip >> RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : )

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RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 3/19/2007 11:38:53 PM

76MonteMan

Posts: 224
Joined: 9/8/2005
Status: offline

quote:

ORIGINAL: SpaceRider
Dustin, you have some great ET's with your 76Monte.
It would be great if you could post a video of your Monte going down the track : )
Thanks for your post & contributions to the forum.
Peace, `Space

Here's one...
http://www.youtube.com/watch?v=C41ns9lQG8M

_____________________________

Dustin Denner
1976 Chevrolet Monte Carlo
1/4 Mile ET: 14.45 seconds @ 94.37 mph
0-60 MPH: 5.71 seconds

(in reply to SpaceRider)

Post #: 11

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 6:15:24 AM

SpaceRider

Posts: 7850
Status: offline

Source Car Guys Website

2006 Chevrolet Monte Carlo LT 3.9L Specifications
Performance

Original MSRP Base +
$23,430

Engine
3.9L 242 hp V6

Horsepower (@rpm)
242 @ 6000

Torque (@rpm)
242 @ 4400

4-Speed Automatic Overdrive
Std.

City MPG
20

Highway MPG
28

Seating
5

0-60 (sec)

6.5 sec

1/4 mile

14.56 (sec)

94.1 mph

< Message edited by SpaceRider -- 6/18/2007 6:23:19 AM >

(in reply to 76MonteMan)

Post #: 12

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 7:25:06 AM

wiz kidd

Posts: 4940
Joined: 4/24/2006
Status: offline

i should have my pulley installed soon :) so it should be pretty fun to have a go with a 3.9 l monte now :)

_____________________________

MY 2005 TONY STEWART MONTE CARLO---CLICK FOR PICS

(in reply to SpaceRider)

Post #: 13

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 11:28:58 AM

SolaraSlayer

Posts: 3795
Joined: 8/11/2006
From: Born in East LA
Status: offline

quote:

ORIGINAL: SpaceRider

Source Car Guys Website

2006 Chevrolet Monte Carlo LT 3.9L Specifications
Performance

Original MSRP Base +
$23,430

Engine
3.9L 242 hp V6

Horsepower (@rpm)
242 @ 6000

Torque (@rpm)
242 @ 4400

4-Speed Automatic Overdrive
Std.

City MPG
20

Highway MPG
28

Seating
5

0-60 (sec)

6.5 sec

1/4 mile

14.56 (sec)

94.1 mph

Space, Here is a pic of the 3900 without the engine cover for you!!

The largest of GM's expanding family of 60° V-6 engines, the 3900 achieves larger displacement via an increase in bore size to 99 mm from the 3500 V-6’s 94 mm — requiring the bore centers to be ofset by 1.5 mm. Michalski said the 3900’s increased displacement fits glove-in-hand with Displacement on Demand: "A bigger engine is better when you want to maximize the amount of time the engine spends in three-cylinder operation," he explained.
The LZ8 3900 will be the first GM overhead valve engine to use variable valve timing, and it will be GM’s first V-6 to use DOD. The 3900's variable valve timing is coupled with another important new feature: a dual-path, active intake manifold.

"The variable intake manifold is a significant low-speed torque 'enhancer' for the 3900. It gives the 3900 a broader torque curve that retains higher specific torque output across the engine speed range."

**** Michalski, chief engineer for 60-degree OHV V-6 engines.

The new 3900 V-6 (LZ8) is a 3.9 liter, two-valves-per-cylinder OHV V-6 that is most closely related to the 3500 V-6 (LX9) launched for the 2004 model year Chevrolet Malibu. Its first application without DOD will be on the 2005 Pontiac G6 in late 2004. A version of the 3900 V6 featuring the DOD system will debut in 2005.
The 3900 is estimated to develop 240 hp at 5900 rpm and 245 lb-ft of torque at just 2800 rpm. Moreover, thanks to the 3900's torque-enhancing technologies, 90% of peak torque is available from 1800 rpm to 5800 rpm, enhancing the engine's driveability and performance "feel." According to Alan Hayman, manager-advanced concept group in GM Powertrain's Advanced Powertrain unit, a new 3-valve cylinder-head developed for GM's OHV engines could boost output to 270 hp.

Attachment (1)

< Message edited by SolaraSlayer -- 6/18/2007 11:37:03 AM >

_____________________________

(in reply to SpaceRider)

Post #: 14

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 1:06:51 PM

Revitupfaster

Posts: 447
Joined: 11/23/2006
Status: offline

I would like to see the results from a run off with these engines. I would hope that both were bone stock. I had a 2004 S/C Monte, and she would (in my opinion) really haul ass up to about 90mph. I felt the power would drop off in around the 85/90mph range. I always thought this would be due to the 6 cyl just not having the cubes to sustain the power. I also had a 2001 3.8 non-supercharged, and the performance difference between these cars was substantial.

I have never driven a 3.9, but being rated at 242hp, it's in the same league as the 3.8 s/c. I don't know if the supercharged 3.8 might be more of an instant power jolt which the 3.9 couldn't catch or not. To me, the supercharger seemed to give you a major hit at low and mid speeds. Good question, I hope someone can answer it. Hopefully as stated, both cars are bone stock, otherwise we still won't know.

_____________________________

Revitupfaster
2007 SS - Black Amythyst/Silverstone
Lite Grey Interior

(in reply to SolaraSlayer)

Post #: 15

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 1:43:09 PM

SpaceRider

Posts: 7850
Status: offline

Hi Bill & Members,

RevItUpFaster - Bill, you've had a great group of Monte Carlo's.

I also think a 3.8 SuperCharged Monte would have a slight advantage

over a 3.9L engine, but I think it would be a close race.

1. Both engine's stock

2. Same skilled driver's

I keep hoping that a member will be able to race their 3.8 SC against a 3.9L

and record the event or have time slips.

One advantage of the 3.9L is that is uses regular fuel & the 3.8 SC needs Prem/HighTest

The weight of both are about the same & I think the gearing is the same also.

I'm sure that someone will be able to find someone to line up. I've been look'in for

a 3.8 SC 2 line up with, but I can't afford another ticket for Street racing & I would set it up to

go to the track... My Insurance now is kill'in me... I have 5 more months 2 go

before I'm off driving probation from Street Rac'in: (

Until then I will keep check'in the forum for a member to post their results : )

Thanks for your post `Bill & members.

Your mission, `if you choose to accept ? = is to find a Monte Carlo & Race it & Report it

on the MCF : )

< Message edited by SpaceRider -- 6/18/2007 1:49:58 PM >

(in reply to Revitupfaster)

Post #: 16

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 2:39:49 PM

SpaceRider

Posts: 7850
Status: offline

The 3.8 SC has greater torque @ a lower RPM then a 3.9L

3800 3.8L V6 Supercharged

Specifications

Displacement: 3791cc

Assembly Site: Flint, Michigan

Configuration: Overhead Valves (2 valves per cylinder)

Horsepower: 260 hp @ 5200-5400 rpm

Torque: 280 lb-ft @ 3600 rpm

Applications: Pontiac Grand Prix

Features: Eaton Supercharger

3900 3.9L V6 (LZ9/LGD)

Specifications

Displacement: 3880cc

Assembly Site: Tonawanda, New York

Configuration: Overhead Valves (2 valves per cylinder).

Horsepower/Application:
227 @ 6000 rpm (G6 Convertible)
240 @ 6000 rpm (G6, Malibu SS, SV6, Uplander, Relay, Terraza)
242 @ 6000 rpm (Impala, Monte Carlo)

Torque:
235 lb-ft @ 3000 (G6 Convertible)
240 lb-ft @ 4600 (G6, Malibu SS)
240 lb-ft @ 4800 (SV6, Uplander, Relay, Terraza)
242 lb-ft @ 4800 (Impala, Monte Carlo)

Features: Dual Variable Valve Timing
Roller Rocker Arms
E85 Ethanol Capable (LGD only)

Did any member catch the mistake of this post ?

Post it : )

< Message edited by SpaceRider -- 6/18/2007 2:52:33 PM >

(in reply to SpaceRider)

Post #: 17

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 5:57:55 PM

wiz kidd

Posts: 4940
Joined: 4/24/2006
Status: offline

i think the supercharger obvously helps with acceleration, but it also helps in the top end where a non supercharged car would slow off quicker, the supercharged one just keeps goin and goin

once i get my pulley installed i will definetely post how she move's then, cuz i think she already moves good now, can't wait for that extra 20-25 hp:)

_____________________________

MY 2005 TONY STEWART MONTE CARLO---CLICK FOR PICS

(in reply to SpaceRider)

Post #: 18

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 9:19:17 PM

FlynhghR

Posts: 1108
Joined: 2/24/2007
From: Iowa
Status: offline

Space, the Pontiacs must be over-rated, because I beat a S/C grand prix.

Ok, Imma only say this once. The LZ9, aka 3900 aka 3.9L has over 200 in torque from 2K to 6K (redline). So while overall it falls short in torque production numbers, it's torque curve is more effective in a race. You can really see the effect of the Variable Intake in the torque curve. It's a smoother curve than the S/C's, considering the S/C 3800 torque curve peaks very early, then drops off. Why? Because the stock exhaust of the 3.8 is much more restrictive (U-Bend). The 3.9 eliminated that troublesome U-bend, while also getting the Variable Intake. Look at the numbers, 14.56 seconds to 15.1. The tall 2nd gear of both vehicles really makes those torque numbers shine, and in the latter parts of second gear the 3.9 will easy catch up (to pass later) if not pass the 3800 straight up. The 3.8sc also has its torque earlier, making it harder to get a good start out of the car, without spinning the tires.

Now I honestly haven't seen the gm-made dyno of the 3.8sc, to compare it to the GM one I have of the 3.9, but I'm sure if you look at the torque curves you'll easily see what I'm talking about. In my car, taking off on dry pavement, it's nearly impossible to really spin the tires for a good amount of time. I don't know if the traction control is always there or what, but even with the TC off the engine backs off if the tires are spinning substantially-which, coincidentally, is very easy when taking off while turning.

Now, I'm no genious, but I've done a fair amount of research, so I am fairly confident in saying that a Dead-stock 05 SC 3800 versus the 2006 Monte (bone stock) will be a VERY good race, but one I believe will end with the 3.9 in the lead. If anyone here in Iowa has a S/C 3.8 monte, bone stock, I will gladly replace my K&N with a stock paper replacement to make it a fair race. But, loser pays for the paper filter, and the track time

The nearest track has a Test and tune day Early next month, and it's 20$ per entry, but not sure of any other fees.

Anyone interested, PM me.

_____________________________

2006 Monte Carlo 3LT with a 3.9L engine.
K&N Stock replacement air filter.
Dual 10" JL's with a 800 Watt Rockford Fosgate

Quote of the year: "Don't be like Fink"

(in reply to wiz kidd)

Post #: 19

RE: 3.8 SC vs. 3.9 LZ9 1/4 miles Race : ) - 6/18/2007 9:30:32 PM

FlynhghR

Posts: 1108
Joined: 2/24/2007
From: Iowa
Status: offline

Here's the 3.9's stock GM reported Dyno map

Thumbnail Image

Attachment (1)

_____________________________

2006 Monte Carlo 3LT with a 3.9L engine.
K&N Stock replacement air filter.
Dual 10" JL's with a 800 Watt Rockford Fosgate

Quote of the year: "Don't be like Fink"

(in reply to FlynhghR)

Post #: 20