Welcome to Mustang Evolution.
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02-28-2005, 08:11 PM
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#1
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3.9 liter or 3.8?
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Registered User
Join Date: Jan 2004
City: Columbus
State: Ohio
Posts: 188
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My friend claims that his stock 2004 mustang is much faster than mine with his 3.9 liter engine even though my 2003 has a MAC cold air intake, BBK throttle body, and a Motorvator throttle body spacer. Is his faster or is he full of Sh*t. I read online that the only reason its a little bigger is that Ford redesigned the intake manifold or something like that but they weren't sure how much HP that makes. Do you guys know anything about this?
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Stupid Neons....Always pulling out infront of me
Can't they see I'm hauling ass right now!?
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02-28-2005, 08:12 PM
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#2
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postarama
Join Date: Aug 2003
City: Southaven
State: Mississippi
Posts: 24,424
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He's full of crap. The differences aren't enough to make the 04 any faster with it's 3.9
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"I'm not driving too fast...just flying too low"
Mine:
-87 ranger- broke
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project
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02-28-2005, 08:14 PM
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#3
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Elite member
Join Date: Dec 2004
City: Hesperia, California
State: California
Posts: 1,092
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I thought the 3.9's were one of the finest tuned engines for the 6 cylinder mustangs but it still doesn't matter. As long as you're both manual, considering equal driving skill you should pull away because you're modded. Why don't you just race to find out though? |
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02-28-2005, 08:16 PM
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#4
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sʞɔns ʇuǝɹq
Join Date: May 2003
City: Macon
State: Georgia
Posts: 10,774
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same motors, just rounded the size differently
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-Jimmy I drive a station wagon.
GO BRAVES
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02-28-2005, 08:20 PM
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#5
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I need bolts
Join Date: Oct 2004
City: Dallas PA
State: Pennsylvania
Posts: 3,527
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Actually he might get beat by the stock cause of his throttlebody. I heard that you can actually lose HP from putting a new one on too soon on 99-04's. 
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02-28-2005, 08:23 PM
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#6
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Elite member
Join Date: Dec 2004
City: Hesperia, California
State: California
Posts: 1,092
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maybe it causes turbulence? |
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02-28-2005, 08:30 PM
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#7
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WTF^^...
Join Date: May 2003
City: Hoover / Florence
State: Alabama
Posts: 27,324
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the motors are identical minus a little crank rework... I belive they just yanked parts from the windstar to save money.... so there is no difference in performance, if he dont like that then we could agree with him if we both wanted to be wrong.
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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02-28-2005, 10:43 PM
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#8
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what is this bat you speak of?
Join Date: Aug 2003
City: San Angelo
State: Texas
Posts: 1,382
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The only thing that could affect the size of an engine (displacement) is a change in the bore or the stroke or both. The intake has nothing to do with either, nor does a cam, throttle body, spark plug, type of oil or any other thing anyone can think of.
Steve
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1996 Mustang
1965 Barracuda
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02-28-2005, 11:21 PM
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#9
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Mustang Freak
Join Date: Jun 2003
City: Davenport, IA
State: Iowa
Posts: 473
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SpectorV has it exactly right. They are just saving money by using the same crank that another production car uses. There is only a few CI difference. I believe it's less than 10 cubic inches difference so they rounded up rather than down. No performance gain, just a different number on the sale sticker.
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T-loc, Custom CAI, Half-shafted throttle body, Steeda Quick Release Clutch Quadrant w/ Firewall adjuster and adjustable clutch cable, ASP-underdrive pulley, GT rear swaybar, GT Quad Shocks, Full MM Coilover conversion w/ "aggressive springs," 17" Grey Torque Thrust wheels, FMS Aluminum driveshaft & Tri-Ax Shorthrow shifter. SSM ported intakes and a FLEX 1/2 spacer, RPM ported heads and a 207 cam. SCT chip. 
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03-01-2005, 12:16 AM
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#10
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God
Join Date: Jun 2003
City: DFW, TX
Posts: 3,189
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The engine comes from the new Freestar minivan where as the 3.8 came from the Windstar. They did away with the Windstar and brought in the Freestar. Ford decided to up the displacement just a minute amount to market it different, and the v6 had the same engine as that for 1/2 model year. The 2004 1/2s are the first with the 3.9L
The reason larger throttle bodies can lose HP (supposedly) on 99+s is because the split port manifolds already have a 60mm throttle body which is more than enough for 190bhp. Going larger increases volume but decreases velocity. (due to pressure rules) Decreasing the velocity in an N/A motor loses HP. Furthermore, the mouth of the intake plenum is matched for a 60mm throttle body. Increasing the TB and not the plenum causes there to be a couple mm difference. This is a wall for the air. You still have a 60mm opening at the manifold side, but a larger diameter for the TB. So you lose the velocity thru the TB and then hit a wall and lose the volume you increased with the larger TB. NOT TO MENTION a wall disrupts air flow and causes turbulance which also can make you lose HP. This is all speculation as I have not seen any dynos of 99+ with just a TB difference.
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