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Thread: Turbo Discussions (split from Beyond Dyno Day in Spring 2003)

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    Hey , quick question... How do you prevent your self from detonating while on the Dyno ... anything hooked up to help predict it coming ?
    Just because I want to find my highest boost level and what not, so how would I go finding that with out blowing my engine ?

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    just get premium, add octane boost, and retard your timing
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    octane booster's a scam.
    use racegas.
    But then you won't know what your detonation level is.
    The only way to see is to guess and check.

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    steal some toluene from the lab..

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    Originally posted by ConVict
    Hey , quick question... How do you prevent your self from detonating while on the Dyno ... anything hooked up to help predict it coming ?
    Just because I want to find my highest boost level and what not, so how would I go finding that with out blowing my engine ?
    1st step is to jump into reality and realize you will never be able to get near 30PSI with you new engine!

    2nd step is to jump into reality and realize you will never be able to get near 30PSI with you new engine!

    3rd step is with the questions I have seen you ask is hire a mechanic to do your swap, because you have no clue about cars!

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    30PSI on a dsm transmission is not a good idea. After 1 run on that if you shook the tranny, you would hear things moving around

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    DSM transmission ? my transmission is mazda !
    I wont bench talk but we will see how many psi I can get... Just because your Sr20det cant push that much doesnt mean a completly different engine with different compression ratios wont be able too ...

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    Er never saw that you had a probe lmfao. I thought you had a talon I still dont see you being able to put 30psi to the ground (thats a fuck load of power).

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    Originally posted by ConVict
    DSM transmission ? my transmission is mazda !
    I wont bench talk but we will see how many psi I can get... Just because your Sr20det cant push that much doesnt mean a completly different engine with different compression ratios wont be able too ...
    What does compression have to do with it? Most turbo engines are 8(ish):1 compression, I does not differ much from brands. 30 PSI is just tonnes of pressure I don't think you understand what your talking about. To push that much air is stupid, because if you need to push 30PSI your turbo is wayyyyy toooooo small. The engine is still a 4cyl, head flow is a concern at those pressures. Let's take a supraT for example, I have seen some big PSI numbers but generally you don't see 30PSI, why? Because the bottom line is it's not efficient, you can get a bigger turbo and push less PSI and make more power.

    Curiosity, when will this swap be complete?

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    Thats right. It doesnt matter what pressure you are at. When looking at turbos its best to look at the cfm rating, among a few other thigns.

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    Besides the fact this is getting the thread off topic, I have a rather small turbo that is vary capable to hit 30 psi... It is my goal to TRY and hit 30 psi because I know of a fellow friend who hit 26psi on the same motor... And I will admit when it comes to F/I I sure dont know it well enough to throw my own projects together but I am trying to learn.. I know engines well enough, just not the technical stuff when it comes to Turbo's
    The completion day is hard to tell... Most of my work is done by a friend who does it in his spare time when he isnt busy.. Money issues at the moment... Parts need to be shipped...
    so with a combination of all of those its hard to say when it will be done... Sorry

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    uh, i think you need to do some more research about turbos, convict.

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    Hell my stock mazda turbo could hit 30psi. But it starts making so much heat past 18 its not worth it at all. I wouldnt count on a small turbo going that high w/o causing problems.

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    i dont think the turbo's gonna make it to 30psi even if your motor does.
    and if your turbo's too small, you'll have no top end power.

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    the turbo won't be able to push the cfm's at 30psi to make the power your hoping for..... this assumes it can even go up to 30psi...

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    Holy crap, I go away for 2 days, and BOOM

    Quick summary. Yes, we can "predict" detonation before it happens bad enough to hurt anything. The question is can you get your foot off the gas fast enough

    Boost. Boost has nothing to do with power. Boost is just a measure of the restirction your engine poses to airflow.

    Ever wonder why one 4 cylinder can make 200hp with 20 psi, but another only takes 8 psi? Because boost has nothing to do with power

    Thats how you chose a turbo. You need to roughly know your engines airflow potential, and the power you want to make, then you need to figure out how much AIR MASS (lb per minute) of airflow you need to make the power you want, and how much "boost" that will result in ON YOUR MOTOR, then you pick a turbo that will move that air MASS at that boost (pressure ratio). Soooo, what all this means is, a turbo meant to move 30 lb /min air at a pressure ratio of 2.5:1, can be just as efficient as a turbo meant to move 30 lb/min at a pressure ratio of 1.8:1

    It is nothing for "inefficient" 4 cylinder motors to require 18 to 20 psi to make 200hp, and its also nothing for a good efficient, 4 valve per cylinder motor to make the same power at 12 psi, with less displacement no less. These 2 motors woud require 2 different turbos to reach their goals as efficiently as possible. Both turbos in the end would be moving the same MASS of air (all that really counts), one motor would jsut need more boost to jam the same airflow through....

    OK, its late, and this may have been more confusing then helpfull


    Toma

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    Guess I should have asked what turbo you had

    Toma

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    Originally posted by Toma
    Guess I should have asked what turbo you had

    Toma
    does it matter?? The man's gonna have a 600hp car boosting at 30psi!!! Minute Muffler knows what they're doing!

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    What ever gadgetboy... i love pricks like you that think because they got something snappy to say they are cool...
    Toma thanks for the technical turbo talk.. I didnt quite get the ratios you were saying but I understand now that PSI doesnt mean power! SO I learnt SOMETHING hehe
    And earlier hollywood when I said it would clog your exhaust I meant in the long run from carbon deposits and stuff... I may be wrong but flames going in your exhaust does leave deposits does it not ?
    One thing I dont get is, if a small turbo is spinning really fast, and a big one is spinning slow... but displacing the same amount of air woudnt that create the same amout of pounds per square inch of air ?

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    Originally posted by ConVict
    ... Just because your Sr20det cant push that much doesnt mean a completly different engine with different compression ratios wont be able too ...
    SR20DET's don't need to push 30 PSI to make power. It's easily done at much lower PSI.

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