Kennebell 2.6L low boost

Discussion in '2005+ Mustang GT 4.6L Tech' started by teeje, Jul 28, 2020.

  1. Racer47

    Racer47 Doesn't have much to say S197 Team Member

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    It's been a very long time ago but I may have stole your intake idea.
     
  2. teeje

    teeje Member

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    Gotcha. I might do that I work on heavy machinery so I can get that tubing all day for the price of free. So the 3.5 pulley will be good you think? I’ll definitely keep you guys posted. So far it’s been great just with that base tune. I got scared at first when I revved it up when I heard that loud whooshing sound. Sent it over to mike at kennebell (the video I posted above) and he said that’s normal. I’m wondering if your guys’ blower does the same type of noise?


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  3. Racer47

    Racer47 Doesn't have much to say S197 Team Member

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    3.5" and stock crank pulley should put you at about 9 psi at 6000 rpm. You just need to make sure you are not maxxing out the fuel pump or going lean for some other reason. If its a stock block, I would not rev more than 6200 rpm. Keep 91 or 93 octane in it and you'll be fine.

    And yes, your video sounds fine to me. 2.6 liters is a fairly big blower for a 4.6 liter motor. Plus the blower is always pumping air and with the motor unloaded most of that air is going thru the bypass valve which is not that big of an area. My point is that there is a lot of air moving around and that makes some noise.The kb is well engineered and seldom has any issues.
     
    Last edited: Jul 30, 2020
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  4. teeje

    teeje Member

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    Thank you. And yeah 93 all the time every time nothing less. Very fortunate to have 93 everywhere here


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  5. teeje

    teeje Member

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    Just wanted to say the 3.5 pulley worked. Saw 8 psi at 4500 rpm. Sent datalog and were good. Revision two onto more logging. Guessing it was boost loss from the intercooler.

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  6. crjackson2134

    crjackson2134 Member

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    Elaborate on that please. How can a normally functioning intercooler cause am”boost loss”?
     
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  7. teeje

    teeje Member

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    I don't know the science behind it but I've heard about it in many places. My only guess is the heat exchanger causes boost loss because it is a slight restriction so after the exchanger the boost pressure in the manifold is lower than it is before the exchanger? Idk. Not saying that for sure but that's my only thought right now.

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  8. Midlife Crises

    Midlife Crises Member

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    If the intercooler cools the air, the air will condense and be at a lower pressure if it occupies the same space.
    The cool “ha,ha,ha” thing is the air ( more dance extra oxygen) is still there at a lower temperature. You can add more (smaller blower pulley) and get back up to Your boost limit.
     
    Last edited: Aug 13, 2020
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  9. Racer47

    Racer47 Doesn't have much to say S197 Team Member

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    There is no significant boost lost from the intercooler. Your pulley sizes and boost numbers for the stated rpms all seem normal. This is just how it works. KB likes to run a lot of timing and lower boost to make power. Pretty much the rest of the world runs less timing and higher boost. So your original stock KB pulley is going to end up with low boost. This is just the way it is.
     
  10. stkjock

    stkjock ---- Madmin ---- Staff Member Administrator Super Moderator S197 Team Member

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    don't equate loss with reduction... they are not the same
     
  11. Racer47

    Racer47 Doesn't have much to say S197 Team Member

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    I'm not trying to split hairs. OP seems to think that there is or was a problem. I'm simply saying that the numbers stated are completely inline with what I've personally seen. I've had the same 2.6L KB for 10 years now including 3 different pulleys and 2 different crank pulleys (stock and +10% IW).
     
  12. stkjock

    stkjock ---- Madmin ---- Staff Member Administrator Super Moderator S197 Team Member

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    My comment above was not directed at you in particular
     
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  13. teeje

    teeje Member

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    Well very bad news. Went on a second datalog. Maybe saw 5000 maybe 5500 rpm and the blower seized...gonna call kb tomorrow

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  14. crjackson2134

    crjackson2134 Member

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    Well that just sucks! I’m sorry to hear that. How many miles on the blower?

    EDIT:
    Looking back to the original post (to refresh my memory) I see this is a fairly recent install. Hopefully KB offers a warranty period and this will be covered.
     
  15. teeje

    teeje Member

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    Maybe what .10? I'm not even joking... I took the head unit off and there was shreds all on top of the heat exchanger. Thank god it didnt go into the engine. The screws are all screwed up too..lol no pun intended

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  16. crjackson2134

    crjackson2134 Member

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    Damnit! I hate that crap. I really feel your pain, I’d be pretty upset myself. I truly hope they will just replace this thing without a bunch of hassles.

    When you get a chance, upload some pics.
     
  17. teeje

    teeje Member

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    Here ya go[​IMG][​IMG][​IMG][​IMG]

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  18. crjackson2134

    crjackson2134 Member

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    That’s pretty severe for no miles. Is there any possibility something got pulled into the intake tube and caused this, or do you think it was a material defect?

    I know that with Whipple and Edelbrock, they require that you package it all up, and ship it to them for disassembly to determine if they will take the hit. They seldom do, and usually blame the installer.

    I had my Roush system installed at an authorized dealer/service center to avoid issues like this. I saved up a long time to go FI, and wanted a safety net since reading horror stories of EXACTLY this type of failure on both Whipple / Edelbrock.

    You just experienced my nightmare. I know you’re a young guy, and a Vet. I really hate to see crap like this. Damned Empathy... Sometimes I just have too much of it for fellow Vets.
     
    Last edited: Aug 17, 2020
  19. teeje

    teeje Member

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    Is there supposed to be something in this hole on the heat exchanger?
    [​IMG]

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    Last edited by a moderator: Aug 17, 2020
  20. teeje

    teeje Member

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    I think material defect because I've done 3 pulls for my datalog and they were all fine..

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