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post #811 of 820 (permalink) Old 02-11-2013, 07:38 AM
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Lowering the CR on the engine does NOT allow you to run more boost for more power. Lowering the CR on the engine DOES however allow you to run more boost WITHOUT knock on pump gas. More boost does not always mean more power. There are a LOT of factors involved in building engines that determine the power outputs you are going to have.

For example. My turbo on my evo doesn't "wake-up" until 30psi+. If I were to run anything bigger than 9.5:1 CR pistons I would have to add some sort of alcohol/higher ethanol based fuel (e85 or race gas or meth injection), just for the simple fact of with that much boost, you are adding higher temps with the extra compresson and you will get detonation without adding a type of "cooler" additive into the fuel to help keep it from detonating pre-maturely. You CAN run the stock 10.4:1 CR pistons in your turbo'd 2.4, HOWEVER, this does NOT mean you can't push more boost or the same boost out of it as a 2.2. However, this does mean that you are going to need to add something to your setup to run more boost, and the TUNE has a lot to do with it too. If you can tune for the extra fuel needed for the more boost, as well as the cooler additives, but if you can't tune the car yourself or have someone help you tune it and you start getting knock, REGARDLESS of the CR you have, you will blow it up.

Adding CR to an engine does actually give you more power. So if you can find that medium of CR and boost, you will maximize the amount of power you are going to be able to push out of the engine. So yes, you can raise the CR, and the boost, you just have to make sure you're not doing anything to over push it without the proper safety steps taken to make the engine more "bullet proof" as some of us refer to it as.

In cobalts you have a 3 degree tolerance of KR that you can "safely" get out of these engines. Anything more than that, and you're actually damaging the engine. Obviously with more boost, you have to have a more spot on tune to keep you from getting the KR, so you won't blow up your engine. Just do a little more research before fully deciding on what you want to do. Just don't be discouraged by some, but also, try to keep in mind a lot of us on here have a LOT of experience doing these things with not just these cars, but others as well, and we have a lot of information to give to someone that wants to know. Don't take the information given as a threat or harassment or anything negative, just use it as helpful knowledge that you can use to help further your knowledge on the stuff you're trying to do.

WITH THAT SAID, keep this stuff civil. I read what seemed to me to be a little hostility. I don't want to have to start deleting posts in a sticky.

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post #812 of 820 (permalink) Old 02-11-2013, 07:08 PM
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Quote:
Originally Posted by Leveecius View Post
Lowering the CR on the engine does NOT allow you to run more boost for more power. Lowering the CR on the engine DOES however allow you to run more boost WITHOUT knock on pump gas. More boost does not always mean more power. There are a LOT of factors involved in building engines that determine the power outputs you are going to have.

For example. My turbo on my evo doesn't "wake-up" until 30psi+. If I were to run anything bigger than 9.5:1 CR pistons I would have to add some sort of alcohol/higher ethanol based fuel (e85 or race gas or meth injection), just for the simple fact of with that much boost, you are adding higher temps with the extra compresson and you will get detonation without adding a type of "cooler" additive into the fuel to help keep it from detonating pre-maturely. You CAN run the stock 10.4:1 CR pistons in your turbo'd 2.4, HOWEVER, this does NOT mean you can't push more boost or the same boost out of it as a 2.2. However, this does mean that you are going to need to add something to your setup to run more boost, and the TUNE has a lot to do with it too. If you can tune for the extra fuel needed for the more boost, as well as the cooler additives, but if you can't tune the car yourself or have someone help you tune it and you start getting knock, REGARDLESS of the CR you have, you will blow it up.

Adding CR to an engine does actually give you more power. So if you can find that medium of CR and boost, you will maximize the amount of power you are going to be able to push out of the engine. So yes, you can raise the CR, and the boost, you just have to make sure you're not doing anything to over push it without the proper safety steps taken to make the engine more "bullet proof" as some of us refer to it as.

In cobalts you have a 3 degree tolerance of KR that you can "safely" get out of these engines. Anything more than that, and you're actually damaging the engine. Obviously with more boost, you have to have a more spot on tune to keep you from getting the KR, so you won't blow up your engine. Just do a little more research before fully deciding on what you want to do. Just don't be discouraged by some, but also, try to keep in mind a lot of us on here have a LOT of experience doing these things with not just these cars, but others as well, and we have a lot of information to give to someone that wants to know. Don't take the information given as a threat or harassment or anything negative, just use it as helpful knowledge that you can use to help further your knowledge on the stuff you're trying to do.

WITH THAT SAID, keep this stuff civil. I read what seemed to me to be a little hostility. I don't want to have to start deleting posts in a sticky.

thats all im saying. people take things personal for no reason. its all very simple. i just think people should take a look at what others have done with similar setups before going for that "low comp high boost" stuff. 2.4s are awesome motors. i picked it for that specific reason.

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post #813 of 820 (permalink) Old 02-25-2014, 05:37 PM
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Hey guys i just got the zzp stage 3 turbo kit. I know the stock rods and pistons are recommended to only handle like 250 hp. Should i get better ones and where can i get them?


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post #814 of 820 (permalink) Old 02-25-2014, 09:11 PM
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Yes. Do you know what youre doing? Ebay has a set of eagle rods and wiseco pistons. Gonna need more than that though

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post #815 of 820 (permalink) Old 02-26-2014, 06:16 AM
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Turbos can be frightening things if you aren't adequately prepared/don't understand them.

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post #816 of 820 (permalink) Old 02-26-2014, 06:39 AM
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Exhaust spins turbine, witchcraft happens, you go faster. Thats all you need to know about a turbo.

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post #817 of 820 (permalink) Old 02-26-2014, 06:59 AM
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Lol, it's the witchcraft part you need to keep your eye on.

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post #818 of 820 (permalink) Old 02-26-2014, 07:30 AM
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I know how they work but i know making more power can make the engine more unreliable if you don't build it to be able to handle it


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post #819 of 820 (permalink) Old 02-12-2017, 03:06 AM
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So anyone got any parts they'd sell?. I have everything i need for my turbo kit for my 2.4L cobalt except for a few things.
BOV(preferably tial)
Oil feed and return lines (for a s252et turbo)
Turbo oil pan ( or instructions on how to tap my current one)
And a turbo manifold
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post #820 of 820 (permalink) Old 02-12-2017, 03:18 AM
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Also a DIY guide of some sort would help because its my first turbo and i know the parts i need and theoretically where they need to go but im having trouble finding detailed instructions. Wouldnt it be nice if zzp just sold a how to for dummies book lol
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