2.4L LE5 supercharged - Cobalt SS Network



2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque
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Old 03-18-2017, 09:09 PM   #1
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2.4L LE5 supercharged

I have a few questions about supercharging a N/A 2.4 SS. To anyone that has done it, is it worth it? Will I have engine problems? My SS has 145k miles on it so I know I risk blowing the engine, but obviously don't want that to happen. How much am I going to end up spending? Thanks in advance.
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Old 03-19-2017, 09:09 AM   #2
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If you read the threads in the forum you posted in you will find all of your answers.

https://www.cobaltss.net/forums/how-...through-80620/
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Old 03-19-2017, 01:47 PM   #3
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Ya it's worth it
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Old 03-21-2017, 09:29 AM   #4
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Ya it's worth it
I think boost on any engine is worth it, if you value acceleration g-forces that is
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Old 04-13-2017, 12:19 PM   #5
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I think boost on any engine is worth it, if you value acceleration g-forces that is
hey steelmesh, did you have to drop the compression ratio on your LE5?
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Old 04-13-2017, 12:30 PM   #6
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I say go for it! It's a simple and straight forward swap. And affordable, low mileage LE5s are allover the place.

The parts are cheap, readily available, and if your motor does pop, you have the advantage of getting a new one very cheap.
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Old 04-13-2017, 01:34 PM   #7
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hey steelmesh, did you have to drop the compression ratio on your LE5?
no
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Old 04-13-2017, 02:08 PM   #8
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hey steelmesh, did you have to drop the compression ratio on your LE5?
Stock is fine
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Old 04-13-2017, 03:05 PM   #9
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Stock is fine
Even at 16.5 lbs of boost???

Granted being the 06-07 LE5's with forged internals.... but that just seems cray cray.
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Old 04-13-2017, 03:06 PM   #10
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AHelm3, you still got a 'balt and whereabouts in the Pitt area?!
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Old 04-13-2017, 03:07 PM   #11
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Even at 16.5 lbs of boost???
Long story short, yes.
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Old 04-13-2017, 03:09 PM   #12
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Long story short, yes.
lol, cool story bro.

Better yet, at what point of boost would you have to drop compression ratio?
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Old 04-13-2017, 03:11 PM   #13
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for all realistic intents and purposes, never
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Old 04-13-2017, 03:19 PM   #14
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AHelm3, you still got a 'balt and whereabouts in the Pitt area?!
I sold mine about a year and a half ago. But I'm currently working on an Ecotec swap so I still hang around.

I'm in the Carnegie/Mt.Lebanon area.
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Old 04-13-2017, 03:20 PM   #15
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for all realistic intents and purposes, never
Man, im prodding at this one.. there has to be a point to when you would drop. i mean, at what point do you have too much air and fuel in a small compressed state. Unless youre implying that it would be unrealistic to go over a certain point of boost on these cars??

If you can explain in the least amount of words, that would be a challenge because im sure it has a long winded explanation...

Last edited by Cobalt_noob; 04-13-2017 at 03:25 PM. Reason: Spelling error
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Old 04-13-2017, 03:25 PM   #16
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I sold mine about a year and a half ago. But I'm currently working on an Ecotec swap so I still hang around.

I'm in the Carnegie/Mt.Lebanon area.
Nice man! I work right at the airport and live just past Elizabeth.

If ever in a pickle, do you know how to tune at all? Ive got the general concept down. Just never could find anyone in the area...
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Old 04-13-2017, 03:29 PM   #17
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I personally don't, but I can give you some local leads.

That sounds like a pretty shitty commute you have there lol.
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Old 04-13-2017, 03:34 PM   #18
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I personally don't, but I can give you some local leads.

That sounds like a pretty shitty commute you have there lol.
lol it is in every sense of the word shitty.

But yeah man, thatd be cool.

So are you doin a personal ECOtec swap or for someone???
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Old 04-13-2017, 03:44 PM   #19
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Man, im prodding at this one.. there has to be a point to when you would drop. i mean, at what point do you have too much air and fuel in a small compressed state. Unless youre implying that it would be unrealistic to go over a certain point of boost on these cars??

If you can explain in the least amount of words, that would be a challenge because im sure it has a long winded explanation...
Boost pressure does not determine horsepower, airflow, or what compression ratio you should run.
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Old 04-13-2017, 03:56 PM   #20
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Boost pressure does not determine horsepower, airflow, or what compression ratio you should run.
Well, i figured as much for HP and Airflow, what i cant figure out is what affects compression ratio???

So, at what point can there be too much air for a cylinder to hold before it is no longer efficient??? Or am i way off track in my questioning?
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Old 04-13-2017, 05:30 PM   #21
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Higher compression ratios are more efficient by the laws of thermodynamics. Lowering the compression ratio is just going to net you less power. Unless youre going for 700+hp, dont even worry about it.
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Old 04-18-2017, 10:06 AM   #22
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Well, i figured as much for HP and Airflow, what i cant figure out is what affects compression ratio???

So, at what point can there be too much air for a cylinder to hold before it is no longer efficient??? Or am i way off track in my questioning?

The general issue is higher compression leads to higher cylinder pressures and more heat which requires extra cooling and higher octane to prevent detonation or per-igntition. So the compression ratio you want to run really depends on what cooling mods, fuel, and how close to the edge you want to run it.
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Old 04-18-2017, 10:12 AM   #23
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^^exactly. Basically if you have good e85 you can run pretty high CR and be fine, but if youre limited to pump 93, 10:1 or lower is probably best.
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Old 04-19-2017, 12:27 PM   #24
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Good explanation!

There has to be posts out there, but for just a quick reference... how much boost is permissible on 93, for an LE5 before detonation or pre-ignition occurs?

Would a dual-pass help with combating this???

Good reference to come back to ill say
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Old 04-19-2017, 01:00 PM   #25
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Good explanation!

There has to be posts out there, but for just a quick reference... how much boost is permissible on 93, for an LE5 before detonation or pre-ignition occurs?

Would a dual-pass help with combating this???

Good reference to come back to ill say

That's not how it works. It's not about boost. It's the timing. Higher compression tends to knock on lower octane gas with little timing. When I was on 93 we could only run 10 degrees of timingbefore it would knock. Now on e85 I'm at 23 degrees.
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