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Old 04-16-2007, 10:09 PM   #1
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3.8 vs 4.0 mustang

I have a friend that wants to get a V6 mustang. Insurance and costs keep him from a GT or Cobra. He doesn't know whether to get a 99-04 V6 with the 3.8, or a 05-07 with the 4.0. Is there a big difference between the two engines? Does the " four 0" have noticable power over "the edge" 3.8?
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Old 04-16-2007, 10:20 PM   #2
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Re: 3.8 vs 4.0 mustang

i've got a 3.9, its the best of the old body style + a smidge better than the 3.8, and insurance is no that bad at all, and i'm 18 = /. i would base it off the body style he likes personally.
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Old 04-17-2007, 12:19 AM   #3
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Re: 3.8 vs 4.0 mustang

A 3.9 is a 3.8 with minivan parts. Now that that is out of the way....

The 4.0 is a stronger engine, with just a few supporting mods you will be running with 99-04 GT's.

The downside to a 4.0 V6 is that these are the 05+ cars and are more expensive in both price and insurance.
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Old 04-17-2007, 07:22 AM   #4
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Re: 3.8 vs 4.0 mustang

3.9 is a 3.8 with a windstar crank !!! Like Brad said 4.0 is a stronger engine
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Old 04-17-2007, 08:32 AM   #5
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Re: 3.8 vs 4.0 mustang

the 3.8 is the same as the 3.9 in terms of performance~ for price its cheaper and the aftermarket is more advanced for the 3.8. The 4.0 is faster and in the newer style.

The 99-04 run mid 15s stock with a manual tranny (do NOT buy an auto...) with the 05 running a bit better and possibly hitting high 14s stock.
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Old 04-17-2007, 08:37 AM   #6
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Re: 3.8 vs 4.0 mustang

you say do not buy an auto, but don't the tuners benefit an auto more than a manual?
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Old 04-17-2007, 08:37 AM   #7
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Re: 3.8 vs 4.0 mustang

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A 3.9 is a 3.8 with minivan parts. Now that that is out of the way....
Now you are really going to be motivating kyle to pull you down the highway.

However, I was going to say the same thing.
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Old 04-17-2007, 08:38 AM   #8
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Re: 3.8 vs 4.0 mustang

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you say do not buy an auto, but don't the tuners benefit an auto more than a manual?
They only benefit autos because they change the shift characteristics...they don't make them gain more power...just shift harder.

He said do not buy an auto because of the parasitic loss that comes with the auto trans...and the fact that if you want to have any kind of fun, you pretty much require a tuner...where as a manual, the fun comes standard.
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Old 04-17-2007, 08:48 AM   #9
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Re: 3.8 vs 4.0 mustang

damn i need to get a tuner...
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Old 04-17-2007, 01:12 PM   #10
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Re: 3.8 vs 4.0 mustang

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A 3.9 is a 3.8 with minivan parts. Now that that is out of the way....
ouch...
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Old 04-18-2007, 01:45 PM   #11
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Re: 3.8 vs 4.0 mustang

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ouch...
Haha, nothing bad meant by it. The 3.9 actually shows a 1 to 2 hp increase over the 3.8. I've just been in too many arguments about this.
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Old 04-18-2007, 01:55 PM   #12
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Re: 3.8 vs 4.0 mustang

i didn't know i was part astrovan *pulls out the gun* i didn't know! i didn't know!
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Old 04-18-2007, 02:00 PM   #13
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Re: 3.8 vs 4.0 mustang

When I was looking at insurance prices it was cheaper for me to get my 99 cobra then an 05 v6.
All the 05-07 v6 mustangs I've seen cost more then 99-04 GT's. I don't see how it would be cheaper to get the newer body style unless it has lots of miles on it.
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Old 04-18-2007, 08:41 PM   #14
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Re: 3.8 vs 4.0 mustang

dont listen to the hype............a 3.9 is the best engine created



and hell, with my mods and an 05 auto w/ the same mods (- the udp) only pulls about a car on me from 0-90

and my car can keep up decently with a 99-04 auto GT..........ask rob oh and rob, we need to run from a dig
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Old 04-18-2007, 08:43 PM   #15
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Re: 3.8 vs 4.0 mustang

a 4.0 is stronger stock in terms of power and responds better to basic boltons.......but in the long run, the 3.8/3.9 is a stronger motor as far as reliability
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Old 04-18-2007, 08:49 PM   #16
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Re: 3.8 vs 4.0 mustang

just make sure you put oil in it
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Old 04-18-2007, 08:54 PM   #17
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Re: 3.8 vs 4.0 mustang

I have to disagree with Kyle. The 4.0 is a proven engine.

If I had the choice, I wouldn't choose 04 or 05 based on the engine. I would base my decision on which body style you like better.

Choosing between an 04 or 05 V6 mustang for power is like choosing between a pink or a purple poodle...neither one is really worth it.
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Old 04-18-2007, 09:22 PM   #18
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Re: 3.8 vs 4.0 mustang

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I have to disagree with Kyle. The 4.0 is a proven engine.

from what i heard from mustang forum members that work for ford, youre right. its more effecient, responds better to boltons, and has more power stock. but in the long run, the pushrod is more reliable and can take more stress. when ford tweaked the 4.0 and tested the performance, it was too close to a GT according to the test so they made the intake, stock tune, and exhaust way too restrictive. the previous years werent as restricted.

they dont really have more power, they just have better gearing, especially in the autos.............they make 17 more crank hp and heavier.....that 5-speed auto is what makes it quick
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Old 04-18-2007, 10:06 PM   #19
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Re: 3.8 vs 4.0 mustang

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a 4.0 is stronger stock in terms of power and responds better to basic boltons.......but in the long run, the 3.8/3.9 is a stronger motor as far as reliability
Yes it is, from what I have read it can't handle as much continuous PSI as the 3.8. (the 3.9 can only handle 4 psi however)...
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Old 04-18-2007, 10:09 PM   #20
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Re: 3.8 vs 4.0 mustang

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Yes it is, from what I have read it can't handle as much continuous PSI as the 3.8. (the 3.9 can only handle 4 psi however)...


4?!?!?! i dunno where the hell you heard that
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Old 04-18-2007, 10:18 PM   #21
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Re: 3.8 vs 4.0 mustang

Because the 3.9 blows, sorry, it's the truthyness...
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Old 04-18-2007, 10:32 PM   #22
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Re: 3.8 vs 4.0 mustang

ok buddy.........................
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Old 04-18-2007, 11:07 PM   #23
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Re: 3.8 vs 4.0 mustang

Don't take offense, sometimes we must all face our own inadequacies...
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Old 04-18-2007, 11:16 PM   #24
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Re: 3.8 vs 4.0 mustang

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Don't take offense, sometimes we must all face our own inadequacies...


I can see Kyle now...he is probably about ready to throw his computer.
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Old 04-19-2007, 06:40 AM   #25
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Re: 3.8 vs 4.0 mustang

hahahahahha i can see that to rob. his face is all red. and out of his mouth comes... " Dude............ no way."
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Old 04-19-2007, 11:05 AM   #26
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Re: 3.8 vs 4.0 mustang

the 4.0 is sohc too...i don't think the 3.9 can come close to it
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Old 04-20-2007, 06:47 PM   #27
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Re: 3.8 vs 4.0 mustang

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i've got a 3.9, its the best of the old body style + a smidge better than the 3.8, and insurance is no that bad at all, and i'm 18 = /. i would base it off the body style he likes personally.
3 more rated hp FTW
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Old 04-20-2007, 06:50 PM   #28
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Re: 3.8 vs 4.0 mustang

Did someone say a pushrod is more reliable than an OHC???? We own both and know the answer to that question.

Yeah, that's why vortec advertises 300 and 350 and 400 hp from the 4.0. Wonder why they never did it for the 3.8......
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Old 04-20-2007, 10:14 PM   #29
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Re: 3.8 vs 4.0 mustang

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I can see Kyle now...he is probably about ready to throw his computer.

nah its fine..........i know what it can do, it dont matter what others think. no need for a penis measuring contest........i love my "outdated" mustang



anyway, rob, you've seen some of the people thats seen my taillights.........stock/lightly modded 05s, gabe's bolton and geared 5 speed 98 (from 0-75/80), stock/lightly modded 5.0s, numerous ricers, v6 camaros, etc
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Old 04-20-2007, 10:36 PM   #30
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Re: 3.8 vs 4.0 mustang

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Did someone say a pushrod is more reliable than an OHC???? We own both and know the answer to that question.

Yeah, that's why vortec advertises 300 and 350 and 400 hp from the 4.0. Wonder why they never did it for the 3.8......

i'm just goin by what i read on the forums.........the 4.0 has more power stock and has better gains, i've just heard that the 3.8 is more reliable. if i am misinformed, please let me know..........i dont like misinformation. and also, please let me know why and how the 4.0 is more reliable

and about your power gains, those can be obtained with a 3.8 too........darkshadow has 330rwhp on his turbo'd 3.8. and theres a guy with a s/c'd 4.0 down here puttin down around 350rwhp....before his motor blew, but that was due to a bad tune by some other guy
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Old 04-21-2007, 01:19 AM   #31
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Re: 3.8 vs 4.0 mustang

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i'm just goin by what i read on the forums.........the 4.0 has more power stock and has better gains, i've just heard that the 3.8 is more reliable. if i am misinformed, please let me know..........i dont like misinformation. and also, please let me know why and how the 4.0 is more reliable

and about your power gains, those can be obtained with a 3.8 too........darkshadow has 330rwhp on his turbo'd 3.8. and theres a guy with a s/c'd 4.0 down here puttin down around 350rwhp....before his motor blew, but that was due to a bad tune by some other guy
Yep so often it's due to a bad tune. That's what kills more motors than anything.
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Old 04-22-2007, 09:00 PM   #32
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Re: 3.8 vs 4.0 mustang

Ill run my 3.8 vs 3.9 BUT My 4.0 in the explorer feels better and I would get a 4.0 if I had to stay v6. BUT newer the car, (does not matter as much as the engine) higher the rates will be.
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