2.3L vs 2.4L

[niterydr]

there is a kid down here with a built 2.4L in a fwd 2g with the friggin t25 on it, haha. BOOST AT IDLE FTW!!
Are you serious?

WTF....

[Super Bleeder!!]

i am, sadly. the kid is a genius.

[TheBlizzard]

I have heard of a few people doing that for breaking a motor in before but not for normal operation.

[sleepydsm]

No. The larger motor will consume more fuel. Your turbocharger will also hate life.

Well let's add: 550s. Why would the turbo hate life? Just because there is more exhaust (volume and energy) that it might, in a sense, overwhelm the turbo?

[Shotgun!]

Think of putting a T18 on a 4G63. It will hate life. Just trust us, hate life. I have always wondered about the "bigger block" folks that have the stock turbo or turbos. I had a domestic guy asking about how far you can take a DSM, so 2.3s and 2.4 came up. He got super excited about the easiness of it all. He then starts talking about how much power a 2.4 should make with a stock turbo. I explained that the engine is an accessory of the power source, which is the turbo. He turned red. There is a 3.5L 9b Stealth too.

[Shane@DBPerformance]

There is some wrong info in this thread.

The 4G63 bore is 85mm, while the 4G64 bore is 86.5mm, not 87mm.

The rod ratio of the 2.3l is not better than the 2.4l, it is the same. They use the same rod length and same stroke. The 2.3l just uses a condensed piston.

You should actually be able to run a 2.4l block on a stock car. The stock DSM air metering system is not based on volumetric efficiency, like a Honda or speed density car. It uses a MAS, which measures actual airflow into the motor. The MAS would read more airflow for the bigger displacement and the ECU would add more fuel on it's own.

[niterydr]

There is some wrong info in this thread.

The 4G63 bore is 85mm, while the 4G64 bore is 86.5mm, not 87mm.

The rod ratio of the 2.3l is not better than the 2.4l, it is the same. They use the same rod length and same stroke. The 2.3l just uses a condensed piston.

You should actually be able to run a 2.4l block on a stock car. The stock DSM air metering system is not based on volumetric efficiency, like a Honda or speed density car. It uses a MAS, which measures actual airflow into the motor. The MAS would read more airflow for the bigger displacement and the ECU would add more fuel on it's own.
Whoops, 86.5mm that's right. I'll go fix that :o . I just always order atleast 87mm pistons, thats what I get for not looking it up and "remembering it".
You COULD run a 2.4L block in a stock car, and your right it would work just fine. That is the beauty of a MAS sensor.
But with the average dsmer, odds are they'll be doing "cheap/free mods" at the same time. The exhaust would probably be opened up, the intake would be opened up, and the boost would be bumped. Since all these "mods" tax the fuel system on a 2.0 car, it would be highly recommended to upgrade something in the system to handle the extra demand that the 2.4 requires.
Lets not get into how much that 14b will like life with the extra exhaust volume from the larger motor....

[Goat Blower]

And besides that, a stock turbo will make 11, 15, 18 or whatever psi with either engine, it's only the wastegate that bleeds off more air with a bigger engine. As long as that's not restricted or over-run, the turbo could care less what engine is pushing it.

A few years back, a friend of mine made the infamous 2.7L DSM engine and ran it around with a 14b. He said it had no issues and went like a bat out of hell. I didn't see it personally, so it might or might have not been true. :p

[niterydr]

And besides that, a stock turbo will make 11, 15, 18 or whatever psi with either engine, it's only the wastegate that bleeds off more air with a bigger engine. As long as that's not restricted or over-run, the turbo could care less what engine is pushing it.

A few years back, a friend of mine made the infamous 2.7L DSM engine and ran it around with a 14b. He said it had no issues and went like a bat out of hell. I didn't see it personally, so it might or might have not been true. :p

Yeah it will just bleed off the extra boost, but remember this is a stock car. Honestly, I've never tested a oem car with a 4g64 shortblock on it. I would imagine the factory system might not keep up with the boost control.
I know alot of the smaller MHI turbo's seem to spin apart when you start upgrading flow. A few members on here have lost a variety of turbo's after switching motors, heads, cams, etc.

[TheBlizzard]

I also can't see how the engine size is going to affect the turbos life. 11psi is 11psi no matter what engine its bolting to. The only way I could see it faily is from a lubrication standpoint. If it had way to much oil pressure or something else. I guess it could spool so fast it could surge and eventually fuck shit up as well.