• Welcome to SVTPerformance!
ATTENTION!
You may experience intermittent issues while accessing the site over the next 60-90 minutes, as we perform maintenance and upgrades.

Boss 302 Manifold Issues

Discussion in 'Engine/Tuning' started by 121AK, May 24, 2018.

  1. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    Last month I installed a used Boss 302 manifold. I used the previous owner's injectors and fuel rails as his had less miles than mine. I also installed a new Steeda intake tube, JLT catch can and new spark plugs (NGK 6510).

    IMG_8581.jpg

    I had Lund tune the car. Interested to see new HP numbers, I had the car dyno'd at 2 different shops. Here's the second shops dyno graph:

    IMG_7285.jpg

    As you can see, I'm leaving 100+ horsepower somewhere. This just doesn't make sense. I'm not sure where to look. I emailed Lund but they haven't responded to my last email in a couple days.
     

    Attached Files:

  2. Recon

    Recon Well-Known Member Established Member

    Messages:
    3,041
    Joined:
    Jul 23, 2016
    Location:
    In the 427R
    295rwhp for a Boss manifold Coyote? There’s something seriously wrong. Is there a CEL?


    Pick your poison.
     
  3. 13COBRA

    13COBRA Resident Ford Dealer Premium Member Established Member

    Messages:
    17,460
    Joined:
    Jun 4, 2012
    Location:
    Missouri
    When you drive it, does it feel like a Prius?

    If it feels ok on the street, I'd say you're having traction issues.
     
    96gt02 likes this.
  4. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    There's no CEL. I've tried to see if there are any codes, there are not.

    When I initially got it all setup, my butt dyno said it was quicker. I have some pretty wide tires on the rear. I don't think I have enough power to be slipping.
     
  5. 13COBRA

    13COBRA Resident Ford Dealer Premium Member Established Member

    Messages:
    17,460
    Joined:
    Jun 4, 2012
    Location:
    Missouri
    Your butt dyno would know if you were down 100hp.
     
    Swine likes this.
  6. bottle fed 14

    bottle fed 14 Member Established Member

    Messages:
    261
    Joined:
    Jan 13, 2015
    Location:
    El pasotexas
    My boss manifold stock throttle body Cook's 1 and 7/8 inch headers 3 inch off road X lethal 4C converter made 426hpto the tires 376 torque
     
  7. bottle fed 14

    bottle fed 14 Member Established Member

    Messages:
    261
    Joined:
    Jan 13, 2015
    Location:
    El pasotexas
    Aed tune
     
    96gt02 likes this.
  8. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    That's the bad thing, I'm second guessing it now that 2 different dynos have both read around 250-300hp.

    We are having issues with my knock sensors on the nitrous tunes by that's different. I'm running Lund's NA Boss 302 tune right now.
     
  9. basspro302

    basspro302 Active Member Established Member

    Messages:
    357
    Joined:
    Apr 22, 2015
    Location:
    Ohio
    The torque curve looks messed up. And why would you only pull a boos mani car to 6k? Thats when they start to pick up power. Are you filling up with 87 lol
     
    KushBandit likes this.
  10. KushBandit

    KushBandit Member Established Member

    Messages:
    560
    Joined:
    Aug 10, 2014
    Location:
    California
  11. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    I've been filling up at the local Shell station. Buddy said he's had issues with their gas so I swapped stations and filled up tonight. Hopefully that helps. I had no hand in the dyno'ing of the car. The guys revved the car that high.

    The dyno guys didn't for some reason but if you rev past 7100, the car just falls on it's face.
     
  12. mnewxcv

    mnewxcv Well-Known Member Established Member

    Messages:
    2,537
    Joined:
    Sep 19, 2005
    Location:
    Mashpee, MA
    You definitely need to data log and get those logs to Lund.
     
    13COBRA and 121AK like this.
  13. 96gt02

    96gt02 Well-Known Member Established Member

    Messages:
    1,446
    Joined:
    Jan 21, 2015
    Location:
    NJ
    None of this sounds right lol, those graphs are wacked, power shouldn't fall off till about 7500, and unless your running 25% water in your fuel, no amount of bad gas would do this
     
    13COBRA likes this.
  14. GNBRETT

    GNBRETT Premium Member Premium Member Established Member Beer Money Bros.

    Messages:
    3,727
    Joined:
    Oct 14, 2010
    Location:
    Middle Earth
    U didn't make a full pull at 6k. Probably another 100+ hp between 6k-7500k
     
  15. 96gt02

    96gt02 Well-Known Member Established Member

    Messages:
    1,446
    Joined:
    Jan 21, 2015
    Location:
    NJ
    ^ This is not true, every boss intake dyno ive ever seen makes at least 370 HP by 6K
     
  16. sur_real1

    sur_real1 I Am The Organizer Established Member

    Messages:
    1,386
    Joined:
    May 10, 2006
    Location:
    Seattle
    Do you have a reputable speed shop in the area? I'd take it there and have them go over the car with a fine tooth comb.
    A. Dyno sheet looks goofy as F*
    B. Unless you're running watered down 87 octane fuel, you shouldn't be down that much power (are you running watered down 87 octane fuel)
    C. Maybe she's hurt bad. Cams not actuating properly? Compression down?

    If Tl;dr, take to professional :)
     
  17. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    Update:

    My tuner at Lund got back to me and had me pull all the plugs to look for cracks in the porcelain. I just replaced all spark plugs last week and they still look pretty good.

    He's thinking it could be a fuel delivery issue now. I have no idea what it could be.
     
  18. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    A friend of mine was having misfires on our local Shell 93 octane. Which I always thought was good. So yesterday I swapped out to a full tank of 93 at a different station.

    I reached out to a local speed shop to see how comfortable they are with coyotes. If they are, I'm going to drop it off while I'm on my next work trip.
     
    sur_real1 likes this.
  19. clinton2003

    clinton2003 Active Member Established Member

    Messages:
    366
    Joined:
    Dec 3, 2012
    Location:
    Colorado
    you may take it to a local track. see if lund can schedule some time to go back and fourth. if he can, make sure you have a wireless hot spot (your smart phone should work), log at the track, and send them to lund. between that and your mph you should know exactly if you are or are not down on power.

    do you have logs to look at? are you seeing knock? + knock is BAD. and if your fuel was a major issue, you would see that. watch load, your at sea level you should be in the 90's. commanded and measured lambda for the car, they should be close to one another. (really close)
     
  20. 121AK

    121AK Member Established Member

    Messages:
    88
    Joined:
    Apr 2, 2018
    Location:
    Central Illinois
    We do have a track about an hour away. I'm about to leave for a work trip here soon for a month. So time is running out for me to figure this out.

    I uploaded a data-log for anyone to look at. Just a little WOT pull.
     

    Attached Files:

Share This Page