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Cai And Sai Question!

Discussion in 'Engine Building' started by ovcrash, Apr 16, 2003.

  1. ovcrash

    ovcrash Senior Member

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    Is it true that if you put a CAI or SAI on a stock motor, it can make you loose some power? because the compression is not has good, has with the stock intake? Is it true, and it fucking does not do nothing?
     
  2. BigJ

    BigJ I'm just about that action Boss. VIP

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    Ok first off, what is a sai? And a CAI is a great first mod because it helps restore lost horsepower and stuff and makes a good increase in throttle response.
     
  3. ovcrash

    ovcrash Senior Member

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    SAI = Short air intake.
    not as long as a CAI.

    Ok! Good for the throlle response. But is the compression of the motor affected?
     
  4. NoJokE

    NoJokE Senior Member

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    its Short Ram Air Intake. More bottom end torque then a CAI but a CAI has more mid to high end horsies. Compression of the motor is affected internally i.e. pistons, headgasket and other variables. NO it does not affect compression
     
  5. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    the way you lose power with a short intake is you suck up HOT air from the engine compartment
    you get more air faster but its HOT air
    for every 11* you can cool the air entering the combustion chamber you gain 1hp
    the same is true in reverse for hotter air

    so while you are revving faster from getting a larger amount of air it is a weaker "rev"

    some short intakes are designed better than others and put the filter in a better location and will not have a power loss... others just suck ass and do nothing but make noise
     
  6. rsaeini

    rsaeini Senior Member

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    you got it mixed up. a cai is for low to mid and a short ram is for the mid to high.

    here's an explanation:
    -at lower rpm's your motor needs a longer runner to create the velocity in the air. a short ram does that because the piping has a smaller diameter and it's longer in lenght.
    -at high rpm's the motor wants as much air as you can give it. a short ram having a shorter lenght but bigger diameter can do that.

    -a perfect example of this is the intake manifold on a GS-R and if some of you are aware, the Taurus SHO.
     
  7. sohcslammer

    sohcslammer Senior Member

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    :blink: The logic is sound, but........ I had a short-ram akimoto noise-maker when I bought my car as well as 2 piece headers. I switched to AEM CAI and 4-1 one piece headers. It made a HUGE difference. Goodbye torque, hello top-end. My car is still pulling at 7500 RPM'S. It's a dog under 4 grand tho. So if i switched the headers and kept the intake it would have made MORE top end power? No way, I'm pretty sure it's CAI - top end SRI - midrange. Don't beat me, It's just an observation... ;)
     
  8. rsaeini

    rsaeini Senior Member

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    read this post. it might answer your question as to why you got better top end power...one word for you...4-1 header...
     
  9. sohcslammer

    sohcslammer Senior Member

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    :huh: Did you even read my post? I said, if I left the 4-1 and left the SHORT-RAM, would I have more top end than my CAI? What you guys are saying is that unless you have done head work and are revving up to 9g, then a short ram is better? (more useable power) ;)
     
  10. Havok

    Havok Senior Member

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    I've had both, and the AEM short ram was horrible, I felt a slight pull at like 40-50. With the AEM CAI, it is a noticable difference. With a 4-2-1 2 piece stainless steel header, I don't see much improvement, however I don't have any "lag/bogging" throughout the rpm range. Get an AEM CAI and a 4-1 header if you want top end power. Get an AEM CAI and a 4-2-1 if you want more power at about 3000-5000 rpms.
     
  11. sohcslammer

    sohcslammer Senior Member

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    :blink: So, what your saying is, CAI - Top End / SRI - Midrange? Wait a minute.... :wtf:
     
  12. NoJokE

    NoJokE Senior Member

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    umm, so the short ram is BOTH long in length and short in length and is good at BOTH low rpms and high rpms :unsure:. You should clean up what you were trying to say
     
  13. Havok

    Havok Senior Member

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    CAI = all around pwer, SRI = NOTHING
     
  14. sohcslammer

    sohcslammer Senior Member

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    :werd: I'll buy that for a dollar... B)
     
  15. rsaeini

    rsaeini Senior Member

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    read it again. i said the SRI is shorter in lenght but bigger in diameter, there is a difference.
     
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