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Doug Thorley header install question

Discussion in '4 Cylinder' started by Tacoyota, May 20, 2013.

  1. May 20, 2013 at 8:59 PM
    #1
    Tacoyota

    Tacoyota [OP] senile member

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    North of Cali, South of Canada
    Vehicle:
    08 4wd
    4.56 gears, rear trutrac,DT header, 235/85r16 Duratracs, 2nd filter pulled, inter.wipers, Cruise control, Factory alum. whls/winter tires(2nd set), Afe pro Dry-S , Dumbo eared flaps cut down.
    I got my DT headers in tonight, no codes, all looks good. Just one thing on the tone of the headers.

    Are they fairly throaty from under the hood? I'm wondering if I might have a bolt or 2 too loose. I haven't done headers since a 95 v8 and I don't recall them being that loud on acceleration.:confused:
     
  2. May 20, 2013 at 9:22 PM
    #2
    Rich91710

    Rich91710 Well-Known Member

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    Los Angeles
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    08 Base
    Satoshi with FJ badge, factory cruise, factory intermittent wipers, Redline Tuning hood-lift struts, Hellwig Swaybar, Rosen DVD-Nav
    If something is loose, it's going to sound like a .22 firing.
    Pop pop pop pop....
    Headers are louder and tend to "ping" because of the thinner wall compared to the cast manifold.
    Didn't notice it on the V8 because it was probably louder overall, or the car had better sound insulation (Tacoma has very little).
     
  3. May 20, 2013 at 9:28 PM
    #3
    Tacoyota

    Tacoyota [OP] senile member

    Joined:
    Jul 22, 2009
    Member:
    #20028
    Messages:
    2,969
    Gender:
    Male
    North of Cali, South of Canada
    Vehicle:
    08 4wd
    4.56 gears, rear trutrac,DT header, 235/85r16 Duratracs, 2nd filter pulled, inter.wipers, Cruise control, Factory alum. whls/winter tires(2nd set), Afe pro Dry-S , Dumbo eared flaps cut down.
    It doesn't sound like a .22 at least, just louder than I expected and quite throaty under the hood under moderate throttle and higher.
    I couldn't find/feel any leaks, but stopped since it was getting dark.
    One thing that baffled me was there wasn't a gasket on the truck for the flange where the header meets the pipe to the cat.
     
  4. May 21, 2013 at 4:11 PM
    #4
    Tacoyota

    Tacoyota [OP] senile member

    Joined:
    Jul 22, 2009
    Member:
    #20028
    Messages:
    2,969
    Gender:
    Male
    North of Cali, South of Canada
    Vehicle:
    08 4wd
    4.56 gears, rear trutrac,DT header, 235/85r16 Duratracs, 2nd filter pulled, inter.wipers, Cruise control, Factory alum. whls/winter tires(2nd set), Afe pro Dry-S , Dumbo eared flaps cut down.
    Solved it today, the gasket for the header/midpipe flange wasn't where I thought it was when I put it on in the dark. I couldn't find it so I was sure it was on, yet the sound said otherwise.:eek:

    It now sounds like stock, tone isn't any real difference, but it feels freed up over 3000 rpm, feels a bit smoother and quicker going up through the rpm's. FWIW if I had a v-6 I'd do headers there too so the "why not just buy a v-6" camp is invalid.:p

    ........need another mod now reg cab/short box/v6 mod getting closer.
     
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