Page 1 of 11 12345 ... LastLast
Results 1 to 15 of 159

Thread: Kooks headers - blah. FMIC - blah. MP Plenum, not so Blah anymore...

  1. #1
    Join Date
    Apr 2002
    Location
    Madison, Ohio
    Posts
    17,532

    Kooks headers - blah. FMIC - blah. MP Plenum, not so Blah anymore...

    Ok so I have this P O S DD. I got the motor out of a JY XR7 so I don't know much about it other than it more or less runs. Anyway so I'll give you some background on it.

    When it was totally stock it ran about 15.5 or so at the track and put down a measly 185rwhp. Nice. Well anyway, so I ported the 89 blower and slapped a 10% pulley on it. Was rewarded with 204rwhp. My other bone stock XR7 used to make 210rwhp bone stock so this was a little depressing but anyway. It was making 15psi like this (stock exhaust) so I just chalked it up to plugged cats and didn't worry too much.

    Well so later on I came across some parts cheap and decided to try them out. I got an MPII case (but no plenum) so I installed that and ported a stock 94 plenum to match. I took the 10% pulley off because I knew that was a recipe for trouble on the stock IC. I added a 255lph fuel pump and some 50lb injectors I had laying around. I got a home made raised top cheap somewhere so I put that on, and a used PP 75mm TB. I fabbed up a 3" intake tube from some cast off exhaust piping, and slapped an 85mm C&L on the end of it. I figured that as long as I didn't overdrive the blower it would be ok.

    I was wrong. The thing made like 21psi or so and whooped out an amazing 227rwhp. As Ryan Zimmerly is my witness, it was not pretty.

    I knew I had to do something with the exhaust so I scavenged a used (but pretty cool) cat back from Cory Binks' cast offs (sweet Borla's btw), added a resonator of sorts and some 2.0" Magnaflow downtubes with cats. I figured that would flow enough air and it would eliminate bad cats as a possible problem. Then I also ran across a Snow kit for cheap so I figured that might compensate for the crappy IC a little. So away we went. This combo was actually pretty sweet. It made about 250rwhp and about 15-16psi. On the dyno things looked pretty good. At the track it was a different story. This is how the car was set up for the 2011 SC Shootout and low and behold I could not break out of the 14's to save my life. Bogus. 250rwhp should be good for a solid high 13 but I was running 14.2-14.3 even with slicks.

    Well so I figured the exhaust was kind of crappy with those small down tubes and I know the IC sucked (stock) so this past week when Phil was off on spring break I put him to work. We yanked out the exhaust and replaced it with another take-off system I had laying around that is composed of Kooks shorties, 2.5" mandrel downtubes, cats, a Magnaflow resonator, and 3" mid section and some Flow's out back. Looks bad to the bone, sounds worse, and just generally ... well anyway.

    To that we added a genuine FMIC, actually the infamous one from my original 400rwhp build so I knew it would be good, and took the car back to the dyno to reap our rewards. Or weep, as the case may be.

    I think it made 255rwhp. Still makes 16psi boost, so the exhaust wasn't causing any problems before, and frankly the car feels like a pig. I can't stand it.

    It did make about 10rwtq more around 3000rpm, and about 10rwhp at 4800-5000rpm, but it actually lost some power at about 3800. Seems the headers might have some resonate impact at various rpms vs. the stock unported manifolds.

    So there it is. I seem to be an epic fail when it comes to adding power to my junk. If nothing else, hopefully this makes some of you who are struggling to make HP feel better. It happens to everyone.

    So what now? Well, I'm going to add a 10% pulley because it just doesn't have any sack down low. I figure it won't add any HP but if it will at least spin the tires now I'll be happy(er).

    After that I think I'm going to rip the heads off because I suspect a leaking headgasket and put something better on there. I have an old cam laying around that I got somewhere and a set of reject ported heads that need a home. But that's a lot of work and I don't have time right now, so maybe I'll be able to bribe Phil with some cookies or something so he'll "do work" for me.

    Well, that's all folks. I'm going to go back to the track when it's not raining and see if it's really as slow as I think it is..... I'll keep you updated.
    Last edited by XR7 Dave; 05-28-2012 at 11:59 AM.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  2. #2
    Join Date
    Dec 2002
    Location
    Wintersville, OH
    Posts
    4,064
    Put that shat on the squeeze
    Making woosh sounds since 2010!

  3. #3
    Join Date
    Jul 2002
    Location
    Roanoke, Virginia
    Posts
    3,178
    I lost focus after reading "because it just doesn't have any sack down low."


    -Tim
    Current Collection
    1994 Thunderbird SC - Auto converted to 5spd

    1995 Thunderbird SC - Auto

    1994 Thunderbird SC - 5spd
    1989 Thunderbird SC - 5spd - Daily Driver
    1990 Thunder/Cougar XR7 - 5spd
    1994 Thunderbird SC - 3v Project

  4. #4
    Join Date
    Apr 2002
    Location
    Madison, Ohio
    Posts
    17,532
    Quote Originally Posted by neverfastenough View Post
    Put that shat on the squeeze
    We were talking about that. I do have a kit here and about 1/2 bottle of nitrous. Probably just enough to blow it up.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  5. #5
    Join Date
    Jan 2005
    Location
    Long Island, NY
    Posts
    2,925
    cmon dave! your supposed to be number one! step up your game. the shop car cant be a clunker

  6. #6
    Join Date
    Dec 2002
    Location
    Wintersville, OH
    Posts
    4,064
    Shop car runs 8's I believe
    Making woosh sounds since 2010!

  7. #7
    Join Date
    Sep 2004
    Location
    Indy
    Posts
    5,621
    Spark, air, fuel, compression......Whenever these phenomena happen to me, it's always something to do with ring seal. Compression tests are somewhat futile because cylinder pressure at WOT is higher than compressing air while cranking.

    Just a guess!
    1994 SC
    4.5L Twin Turbo SVO
    Project GTFD

  8. #8
    Join Date
    Apr 2002
    Location
    Madison, Ohio
    Posts
    17,532
    Quote Originally Posted by CMac89 View Post
    Spark, air, fuel, compression......Whenever these phenomena happen to me, it's always something to do with ring seal. Compression tests are somewhat futile because cylinder pressure at WOT is higher than compressing air while cranking.

    Just a guess!
    Was thinking the same thing which means heads won't fix the problem. I SOOO don't want to build a motor for this junk.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  9. #9
    Join Date
    Mar 2010
    Location
    kansas city
    Posts
    1,400
    go big or go home

  10. #10
    Join Date
    Dec 2002
    Location
    Wintersville, OH
    Posts
    4,064
    Why build a motor, its a DD, run it till it dies. Get that swb going.
    Making woosh sounds since 2010!

  11. #11
    Join Date
    Mar 2009
    Location
    chesapeake va
    Posts
    195
    that sounds like me. i made 230 off the bottle with ported heads,blower 10%pully and cam. i spray it and run it as is, and enjoy the hell out of it

  12. #12
    Join Date
    Sep 2004
    Location
    Indy
    Posts
    5,621
    I spy something on an engine stand that's painted stupid Ford blue. Black paint, meth carb, slicks, track time.....
    1994 SC
    4.5L Twin Turbo SVO
    Project GTFD

  13. #13
    Join Date
    May 2004
    Location
    Va. Beach,Va.
    Posts
    6,930
    Quote Originally Posted by XR7 Dave View Post
    We were talking about that. I do have a kit here and about 1/2 bottle of nitrous. Probably just enough to blow it up.
    Hold on Nelly................I'm the only one around here that uses the juice.......
    SCCOA Member #2406
    '94 SC AUTO - $$$$ Pit
    http://www.sccoa.com/forums/garage_v..._vehicle&id=19

  14. #14
    Join Date
    Aug 2002
    Posts
    3,659
    You can have first dibs on my stuff when I part it out.

    Glad to see you'll be running something at the shootout though.

  15. #15
    Join Date
    Feb 2004
    Location
    IA
    Posts
    4,252
    I have tons of Girl Scout cookies if that will help get Phil motivated.
    Honor, Grace and Dignity......Remember these

Similar Threads

  1. Used Modified Kook's Mid-Length Headers SOLD
    By Duffy Floyd in forum Parts for Sale
    Replies: 10
    Last Post: 06-24-2010, 07:31 PM
  2. For Sale: KOOKS mid-length headers
    By Ryan A Harris in forum Super Coupe Club of Ontario
    Replies: 0
    Last Post: 04-23-2008, 08:45 PM
  3. Kooks Long Tube Headers
    By Randall Burnett in forum Parts for Sale
    Replies: 4
    Last Post: 02-05-2008, 07:43 PM
  4. problems with kooks headers
    By sd_iconoclast in forum Technical Forum
    Replies: 4
    Last Post: 05-17-2006, 02:04 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •