2.4 to 3.4 [Archive] - GrandAmGT.com Forum

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aaron89
12-02-2007, 05:27 PM
iv searchd but all i found was the swap to 3800, if i was to put a 3.4 in my car what would i need, will my trans work? will the wiring work? and ar the mounts the same? thanks btw its a 2000

AaronGTR
12-02-2007, 05:40 PM
First we need to know which trans you have, manual or auto?

aaron89
12-02-2007, 05:45 PM
auto sory lol

stewartfn18
12-02-2007, 06:02 PM
i beleive the 2.4 and the 3.4 have the same auto trans. as for the wiring harness, the 2.4 will not work. you will need a new pcm and harness. idk about the mounts. anyway if your gonna do a swap, dont even bother with the 3.4. just go straight to the 3.8 s/c with the Heavy duty trans. it has much more potential and gets the same gas mileage. anyone correct me if im wrong.

aaron89
12-02-2007, 06:09 PM
yah i thought about the 3800 but read that there is alot of shaging around haveing to make new mounts and tie all the wiring togather, but if anyone could point me in the direction of a swap with detail would be helpful.

Bryan
12-02-2007, 06:18 PM
If you're doing it just for the performance or whatever, IMO you're better off selling your car and buying a GT or SE with a 3400.

williamGT
12-02-2007, 07:38 PM
I hear it's alot of work. wiring and PCM work

AaronGTR
12-02-2007, 10:06 PM
If you have a 2.4 auto, the trans is not "exactly" the same as the 3.4 auto but they use the same case and the same mounts, axles etc. The V6 auto has a few different internal parts and a better final drive ratio. You could swap the engine directly onto your trans, but if you are looking to build up the power later you'd be better off with the trans from a GT. Of course that may also need modification depending on your power goal. You'd need to make some modifications to the wire harness to use the 3.4 and reprogram the pcm. A bit of work, but not impossible.

Of course, the 2.4 is also a capable engine, but you'd be better off with the manual trans if wanting to go that route. Also a bit of work and some parts needed to swap in that trans, but again not impossible. Either way, I wouldn't bother with a 3800 swap. They aren't bad engines but they are somewhat over rated IMO, and the 3.4 has lots of potential too. You'd do a lot more work and spend a lot more money swapping in a 3800 and 4T65 trans too, and still have to use two pcm's for the gauges to work. Not worth it. (oh, and no they don't get the same gas milage either. Bigger engine=more fuel)

aaron89
12-03-2007, 04:00 AM
yeah wehen the time comes to do something with it im gona swap in the 3.4 i think, do anyone have diagrams on what id have to do do with the wiring

silvergtjrad
12-03-2007, 05:17 AM
Honestly, I would stick with the 2.4. You cant get some pretty good performance out of it, and there is a supercharger kit available from gm as well for a little over $1400, which is somewhere around what you would end up spending to swap motors. http://www.gmpartsdirect.com/results.cfm?perfPackages=1&pkgid=147

aaron89
12-03-2007, 05:50 AM
well the reason i was thinkin on doing the swap is because the motors not the best, burns a good drop of oil, theres 203*** on it so wen the times up for replacement instead of getting hte 2.4 i was thinkin on the 3.4, but the 2.4 with the supercharger seams would proboly have a bit power then the stock 3.4.

stewartfn18
12-03-2007, 09:09 AM
(oh, and no they don't get the same gas milage either. Bigger engine=more fuel)

Not to pick any fights, but what kind of mileage do you get with your s/c. My buddy has a GTP with a 3.2 s/c pulley and he gets about 19 to 22 on any given day. idk if its just my car and how i drive, but i get about 18.

Falke401
12-03-2007, 09:28 AM
My mom has a 2.4 grand am and i have the 3.4. I get almost the same fuel economy if not a little better than she does. In the city i get about 19 mpg, she gets about 18. Highway im not sure because neither of us do much of any highway.

lone_wolf025
12-03-2007, 09:58 AM
well the reason i was thinkin on doing the swap is because the motors not the best, burns a good drop of oil, theres 203*** on it so wen the times up for replacement instead of getting hte 2.4 i was thinkin on the 3.4, but the 2.4 with the supercharger seams would proboly have a bit power then the stock 3.4.

Another thing to keep in mind is that the current fastest GA around is a guy running the 4 cylinder. If your motor is running old and tired and its not your daily driver, pop out the engine and have it rebuilt. It'd probably cost about the same as a 3.4 swap, and on top of that you could set up the rebuilt engine for boost.

sk8rjess
12-03-2007, 03:00 PM
^mhm

gaowners32
12-03-2007, 04:32 PM
stick with the 2.4 and go turbo if its an ecotec get the turbo off a solstice slap it on and your already running faster then a 3.4 at 220hp.

nascarnate326
12-03-2007, 05:49 PM
I (oh, and no they don't get the same gas milage either. Bigger engine=more fuel)


I think I know where your coming from, but a larger motor uses less fuel on the HWY.
Look at the Camaro, TA, GTO, Vette, CTS-V, ect. Granted they run less then 2k at 70, they all get close to 30mpg hwy.

I would stick with the 2.4 as other said. You can get those motors for a decent price, throw some 2.3 or supercharger stuff on that thing and be hella fast. Stay with the auto though, 2.4 manual trannys are crazy hard to find.

williamGT
12-03-2007, 08:21 PM
stick with the 2.4 and go turbo if its an ecotec get the turbo off a solstice slap it on and your already running faster then a 3.4 at 220hp.
I would do the same thing, but he has the 2.4L twin cam

AaronGTR
12-03-2007, 11:14 PM
Not to pick any fights, but what kind of mileage do you get with your s/c. My buddy has a GTP with a 3.2 s/c pulley and he gets about 19 to 22 on any given day. idk if its just my car and how i drive, but i get about 18.

We aren't comparing modded to modded engines. We are comparing a stock 3400 to a stock 3800. I have both. My daily driver is a 97 GPGT w/3800 and my SC'd 3400 still got better milage before I switched cam and injectors. I still get well over 20mpg hwy too. City driving is a little less. When I'm not in boost it's not bad.


I think I know where your coming from, but a larger motor uses less fuel on the HWY.
Look at the Camaro, TA, GTO, Vette, CTS-V, ect. Granted they run less then 2k at 70, they all get close to 30mpg hwy.

That depends purely on one thing. Gearing and transmission. At a given rpm, a larger motor will always use more fuel than a smaller motor of similar design (both pushrod V's) at the same rpm. The reason the bigger motors get good hwy milage is 1) they have more torque so they can cruise on the hwy at lower rpm and still maintain speed, and 2) they have more gears and a much lower gear ratio in 6th than we have in 4th which enables them to cruise at low rpm.

My car is typically over 1400 rpm cruising at 75mph. My parents C5 'vette is under 1000. ;)

Cliff8928
12-04-2007, 12:43 AM
Oh, and the CTS-V doesn't really get that good of mileage.

nascarnate326
12-04-2007, 05:40 AM
Oh, and the CTS-V doesn't really get that good of mileage.

If it has the same LS2 drive train as all the other vehicle's, and a T-56...why wouldn't it?
Im sure if you drove it crazy fast or actually had fun with it you would see single digit mpg, but just hwy cruising it should be near 30.

Cliff8928
12-04-2007, 10:54 AM
Well.... For 2005, these are the rated MPGs for the LS2 6-speed cars.

CTS-V - 13-21
C6 - 16-26
GTO -15-23
SSR -12-19

AaronGTR
12-04-2007, 08:33 PM
Well.... For 2005, these are the rated MPGs for the LS2 6-speed cars.

CTS-V - 13-21
C6 - 16-26
GTO -15-23
SSR -12-19


Yeah, cliff is right. There are two other things to consider when comparing the same drivetrain in different cars. Weight and wind resistance. The car with the best milage numbers on that list (the C6 corvette) is also the lightest and most aerodynamic of the group.


It's something else to think about too when comparing the 3800 powered GP to the 3400 powered GA. The GA is about 300lbs lighter and has smaller frontal area than the GP.

stewartfn18
12-04-2007, 10:42 PM
It's something else to think about too when comparing the 3800 powered GP to the 3400 powered GA. The GA is about 300lbs lighter and has smaller frontal area than the GP.

yea. i forgot about wind resistance.