Kenne Bell 2.8 Installed, Runs Really Rough

Discussion in 'Forced Induction - 5.0L V8 Engine' started by racingmason, Jan 16, 2018.

  1. racingmason

    racingmason Well-Known Member

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    #1 racingmason, Jan 16, 2018
    Last edited: Jan 16, 2018
    Got the 2.8 KB installed. After putting the startup tune in it I have some issues. Car idles fine at 750rpm. As soon as I rev the car there is noticeable hesitation. Putting the car in gear and loading it up gives the same result. Runs rough, hesitates, and won't go past 3000 rpm, and letting off the throttle i get some exhaust popping. At idle I see 20 inhg on the vac gauge, but it doesnt move up like it did stock. What i mean by that as i increase load the gauge goes to around 10 inhg and fluctuates. I did notice the the passenger pcv line to the back of the intake was sucking itself in, so I replaced it with a reinforced line.

    I data logged idle and a slow rev so hopefully someone can put my mind at ease about an install issue as I'm freaking out somethings really messed up.

    https://datazap.me/u/racingmason23/kenne-bell?log=0&data=2-3-11-12-13
     
  2. SoCalTim

    SoCalTim Member

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    Goes without saying but go over every single hose and double check wiring, sensors etc to rule out any installer error.
     
  3. Shamlan

    Shamlan Well-Known Member

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    What TB? and who is tuning your car?

    I did experienced some of these habits and all are gone once I moved to a respected tuner.
     
  4. Obsol3te

    Obsol3te Well-Known Member

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    I had something as simple as counting the wires off the maf wrong during my install. You could start there and just double check the correct wire was used for IAT
     
  5. markmurfie

    markmurfie Well-Known Member

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    You can see the hesitation in the log. The throttle body is not opening and RPMs are raising from spark advance(between flag 1 and 2)note the orange and purple lines. When it does start to open it is choppy and RPMs drop a bit(between flag 2 and 3) note the MAF. Then it steadies out and RPM raise normal.

    I don't see any large fuel error so probably not MAF related. I am guessing you have an issue with your TB or the tune has the wrong TB data in it. hesitation.PNG
     
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    racingmason

    racingmason Well-Known Member

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    KB 168mm TB. Tuner is very respected unfortunately he is su per busy so it'll be a few days.
     
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    racingmason

    racingmason Well-Known Member

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    I pulled some data out of the log file when I tried to drive it around the block. This is a sample from 3000 to 4800 rpm. Is there a way to test the TB and make sure its opening all the way? After the install I verified free movement.

    Here is the data from driving around the block. https://datazap.me/u/racingmason23/kb-rev?log=0&data=4-10-13-16-17-18&mark=1429-2511

    And a snipet:
    VZAzRpn.png
     
  8. Tommy V

    Tommy V Well-Known Member

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    Yes u look at pedal portion % and throttle %actual,this will tell u what the throttle pedal is at and the actual throttle blade itself.
     
  9. OP
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    racingmason

    racingmason Well-Known Member

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    It looks good. I also pulled the intake off and visually checked to see if it opens and it follows the pedal input all the way open. The car runs ok other than the massive hesitation at 2 to 3k. Then the boost hits and it seems fine until you let off the throttle and the exhaust pops non stop. Hard let offs from 1.4 to 3.8 throttle yield a loud backfire.

    Plugs are new NGK 6510s gapped to .022.
     
  10. keltymd

    keltymd Well-Known Member

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    ok I will say it... Vacuum leak maybe? Have you smoked the install?
     
  11. Tommy V

    Tommy V Well-Known Member

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    Who.told u to gap the plugs to .22 that's too tight,you need to put them.at .28.
     
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  12. venumous

    venumous Well-Known Member

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    Maybe he meant 0.032? 0.022 is no good for sure.
     
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    racingmason

    racingmason Well-Known Member

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    I'll try that haven't ran .022 since my kb terminator days so it didn't seem to far fetched for me. Sucks I got to pull the blower to change the drivers side. At 1/4 throttle highway speed it hits hard at 3k and that's from 1500 roll on. It doesn't feel like a pd blower more like a turbo and then it take off. The hesitation comes in

    I checked for vacuum leaks with smoke and there were none.
     
  14. Tommy V

    Tommy V Well-Known Member

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    Yea if u meant,32 I would go to 28,and i.usually use feeler gauges to set my plugs,those silver dollar tapered gappers are not wort a fu!!!!!.I wouldn't think u would have hesation at 3k rpm with a 32 gap though.
     
  15. Tommy V

    Tommy V Well-Known Member

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    If u did mean .22 though,that is definitely your problem!!!
     
  16. OP
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    racingmason

    racingmason Well-Known Member

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    They are gapped at .022. Kb says .035. Ill up it to. 032 it could have been a typo on his part.
     
  17. cobra99dave

    cobra99dave Well-Known Member

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    I had the same problem with my car after swapping to an Aluminator so I think this may help you. I see you have a '17. Apparently Ford made some changes to the electronics in the TB's sometime during '17. 15-16 cars are not affected. Whipple has a documented process that explains how to adjust their throttle bodies for this very same issue however the KB TB's are not adjustable. In my case my car ran fine with the electronics from the original TB but once I used the new electronics from the '17 throttle body that came on the crate motor I had this issue. I swapped them and wala it ran perfect. Do you happen to know anyone with a 15-16 car that you can try using their electronics in your TB? That's the easiest thing to do.

    Below is the link to the Whipple TB page. On the attachments tab are instructions and it tells you the values to look for in terms of TB voltages. If you are outside this range then this is likely your issue.

    https://whipplesuperchargers.com/index.php?dispatch=products.view&product_id=468
     
  18. OP
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    racingmason

    racingmason Well-Known Member

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    I can check it but KB said there shouldn't be an issue when I called them. My AC isn't working now either.
     
  19. venumous

    venumous Well-Known Member

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    You should be fine at 0.032.
     
  20. OP
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    racingmason

    racingmason Well-Known Member

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    So I got a tune revision, ran better than before but still getting shitty mileage and alot of backfiring and popping. I went back and checked all the lines and everything is good. I pulled the pcv out of the passenger side and it is stuck shut..... this car was one of the last 2017s built and has 3k on it. I'm going to replace that and see if it helps out.
     
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