Fiesta ST Intake - 2JR Dyno Results

Discussion in 'Fiesta ST Engine Upgrades' started by joe@2j-racing, Mar 20, 2014.

  1. joe@2j-racing

    joe@2j-racing Active Member

    After installing our 2JR 3" catback and 2JR catted downpipe, I decided to do a couple runs with an intake. Now I dont think there is a true CAI available as all the ones I have found sit below the battery, behind the fans, in the engine bay. Not in the fender.

    What we uncovered is what I suspected. In front of the car were 2, 1hp fans (floor driers). These move a ton of air and would probably simulate a 30-40mph drive.

    At any rate - here are the results:

    2JR 3" Catback
    2JR Catted Downpipe
    OEM Intake Box, with K&N drop in filter
    RUN 13 - COBB AP, 93 OCT map

    Run 15 - removed OEM Intake Box, added CAI - First Run

    fiesta cai cold (2).jpg

    cai in.jpg

    Notice there was no change in hp or tq. Now, after RUN 15, which was the first run with the CAI. The intake temps shot up to 140deg. This is because of the intense heat that is in the engine bay. Immediately the power started to drop off. Our last run was 189whp. The TQ increase is with the CAI is only right at tip in when the turbo hits. After that, there is no change.

    fiesta cai hot (2).jpg
    cai in1.jpg

    ^^ Check out the intake temps - max of 140deg.

    So then I decided to turn the CAI outside the engine bay and rerun the dyno. The intake temps stayed at 80deg or so and the HP returned to normal.

    fiesta out cai (2).jpg
    cai out1.jpg

    Point being, a K&N Drop In not only makes the EXACT same power as a CAI, but its way more consistent in its power as it doesnt pull air from a hot engine.

    So unless you can run a CAI in the fender, or build a box for it, or think of some other way to run cold air to it (and protect from the elements). The stock box w K&N is the way to go.
    airjor13 and Firesail like this.
  2. Register or Sign in

    Advertisement Sponsor

  3. RodMoe

    RodMoe Well-Known Member

    Interesting and this would be a good reason to make for the CAI as a "mental" hp this as it just sounds cool... lol
    Any thought to the little torque squiggles between 2.5k and 4k. ??
    BTW Thanks
    ronnie karlen likes this.
  4. joe@2j-racing

    joe@2j-racing Active Member

    It sounds really cool - esp the BOV. But honestly, what I do.. I would hate the HP loss. When the turbo hit, the CAI makes a bit of a jump in TQ but it negates any gains down the curve. And esp the very high intake temps.

    I prefer to keep the airbox isolated from the engine
    Kalil and Sekred like this.
  5. mrtn

    mrtn Active Member

    This seems to show why the Mountune intake is designed the way it is.
    Last edited: Mar 21, 2014
    Ken@mountune likes this.
  6. Drifter

    Drifter Member

    Look at Finsports CAI, it's tucked in below the headlight. Proven gains. Do some research before you make bold statements.
  7. peoples1234

    peoples1234 Member

    Pretty much any time someone other than the manufacture put's CAI's to the test, they either perform worse or on par with a high flow filter in the stock air box.
  8. joe@2j-racing

    joe@2j-racing Active Member

    The dyno, IAT temps and data dont lie. Shape it any way that suits you - but until a CAI is fully enclosed, and has access to fresh air, the stock box with free flowing filter would be the better choice.
  9. Drifter

    Drifter Member

    Exactly, they dyno doesnt lie. On avg 8-10 bhp and 15-20NM gains with Finsports CAI.
  10. totusPorcus

    totusPorcus Member

    dont think thats available in the US. would be interesting if it was. biggest issue when you start messing with intakes that access the outside of the car is the possibility of it sucking up water during a very heavy rain or when splashing through a large puddle of water. not saying this one would but if you hang around the various forums long enough you find examples where that happens even when the mounting would appear to avoid the issue.
  11. spangenb

    spangenb Active Member

    Not surprised. I plan to fab up some sort of box/duct for my new Injen intake. Has anybody considered putting a 2" hole next to the left side fog light? I have to see what's behind there, but that seems like a good spot for a cold air duct.
  12. spangenb

    spangenb Active Member

    I wouldn't make something completely enclosed to avoid the puddle/hydrolock problem, but I definitely want to segregate the intake air from the engine bay air.
  13. RodMoe

    RodMoe Well-Known Member

    Yes It has been done Post 14 Here is a Linky
    ronnie karlen, Firesail and spangenb like this.
  14. spangenb

    spangenb Active Member

    Excellent :)
    RodMoe likes this.
  15. djdennehy

    djdennehy Active Member

    Interesting information, thanks for sharing (definitely sticking with my drop in)
  16. ryst

    ryst Active Member

    Here is something I fabbed up, I didn't want to cut next to the fog light, so I went below the front bumper. I spray painted the elbows black for final install, it's barely noticeable from any angle and looks close to oem fit since the IC piping bends right where it goes down.

    Sound is not different at all (disappointing) but it SEEMS like I get a tiny bit quicker spool times, but it could be a placebo effect. In any case at least it's cold air.

  17. ryst

    ryst Active Member

    One more shot, even though it's hard to get pics of it installed.
    spangenb likes this.
  18. was-an-M

    was-an-M Member

    It's placebo effect. Those right angles are horrible for flow.
  19. ryst

    ryst Active Member

    You mean like how the stock intake is designed :) The stock air feed is basically two sharp right angles.

    Anyways, yeah I was testing a little with my air compressor to see how the air flowed through, it's not great but it's not going to create negative pressure the way that it's setup. The pipe that goes under the bumper is actually longer than the one in the pic where it's laying on the engine bay, and I found that the longer that pipe is the better it flowed through the right angles. I'll probably replace the bottom one with a more sweeping pipe, they had them but I was worried about clearance. After fitting it, I think the more gradual bend would work, at least on the bottom (top is too tight)
  20. wash

    wash Active Member

    I would slightly worry about a gopher hole effect, they dig their holes with one entrance higher than the other to flow higher pressure air from the low hole through their tunnel and out the lower pressure high hole, they also use wind velocity to enhance the draft.

    If your snorkel is in a low pressure area, you might wind up flowing air through rather than in...
  21. Sekred

    Sekred Active Member

    Actually that's why I installed the mesh on the inlet to stop my pet gopher climbing into the intake for a nap.

    Attached Files:

Share This Page