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Any tips or suggestions on installing DT LT headers on 4.0L 09?

Discussion in 'Performance and Tuning' started by Bobo_1, Oct 6, 2010.

  1. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    Going to install Doug Thorley long tube headers this weekend on an 09 4.0L. I have installed headers on a couple of cars where the space to install them was insanely small and it was like a ring puzzle - got to get it just right before they will finally slip in.

    Looks like doing this on a truck is way easier since there is more room. With only 12K miles I assume the rusted bolts won't be an issue. Doesn't look like there is any EGR to worry about either.

    I think I read somewhere that it is easier to remove the exhaust header studs from the block when doing this. Is that true?

    Anything else I should know about before starting?
     
  2. roxspin72

    roxspin72 Enjoying my addiction

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    The install is easy. Getting the stock manifolds off is a bitch, but the DTLT's are cake. should take no more than couple hours all together. Install the O2 sim and enjoy:D
     
  3. RADTACO68

    RADTACO68 Member

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    Two stage age cold air intake,duel exhaust, doug thorley ceramic headers, 6" pro comp lift
    Just had same headers installed! Cost about 300 worth it! Kickass headers
     
  4. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    Nice to know I am saving $300 :D
     
  5. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    I got the passenger side in last night. Yeah, what a bitch getting the stock ones out! And the instructions didn't mention it but I had to disconnect the y-pipe at the exhaust to move the y-pipe back. That gave the stock exhaust manifold more room to come off the studs.

    My forearms are too big to reach the O2 sensor plug on the drivers side. I think I have talked my wife it to giving it a try - I told her I would bath her if she got dirty:rolleyes:

    Just got the driver's side done. It took my wife and I both to get the O2 sensor unplogged. She got cut/scratched doing this. My forearms and hands look pretty cut up. Even with the truck the space is too small but still better than my Trans Am but still not like working on a bike. In that concept Tacoma where they stuck in a v8 theres got to be zero room.

    Driver side header takes more work to get it to slide it. Still not bad at all. And after the headers are in things are much more accessible and I was able to reconnect the O2 sensor myself. Removing the bracket that mounts to the end of the header and to the bell housing makes getting the header in much easier.

    I also did not use electrical O2 SIMS but used mechanical sims that cost about $6. No codes so far.
     
  6. chilidogrc

    chilidogrc Skewpage

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    How are those mechanical sims working out?
     
  7. woody6047

    woody6047 McGrubber

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    Good job on doing it yourself. Everyone around austin wanted up around 400-500 to do it so i did it myself. Where do you connect the o2 sims? mine didnt come with directions.
     
  8. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    If you have the eletronic 02 Sims you will have to splice the wires into the ECU. Unless you have the new plug and play 02 sims from URD - this one does not require splicing wires. What do you have?

    I tried the mechanical ones, and even double them up to move the sensor further away and I still throw codes. Going to have to get the eletronic ones. URD only has the new plug and play harness. I now realize I would prefer the older model that splices into the ECU.

    For the older model: http://www.tacomaterritory.com/forum/showthread.php?t=32966

    For the new plug and play it should be just that. Unplug the O2 sensor, plug that into the SIMS, plug the SIM into the 02 sensor.
     
  9. kagmyster00

    kagmyster00 Well-Known Member

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    i installed mine last week seemed to be pretty easy except for some rusted bolts. I also got the O2 sim and it hooks up to the rear O2 sensors it is real easy to install when i started mine up no codes but now after a week i can hear it leaking on the passenger side head and both flanges
     
  10. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    Install recommends retorgueing all bolts after a 20 minute warm up.

    I snapped off one rusted bolt trying to get it off.
     
  11. wiscdave

    wiscdave Lets Do It!

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    How are the gains?
     
  12. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    I can only give you a seat of the pants assessment. The gains are there. Maybe 10-15 hp. The sound is much better too. I added the MAF Calibrator with a custom map from URD and the gains are even more - again, seat of the pants only.

    I always put headers on my vechiles (not my wife's :)) as the gains are always there. The headers for the Tacoma are allot cheaper than any other vechile I have put them on.
     
  13. kagmyster00

    kagmyster00 Well-Known Member

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    Bobo was the MAF calibrator worth it and how was that install was it plug n play or did you have to do some splicing cus i was thinking on getting that in the future but didnt know if it was worth it
     
  14. Bobo_1

    Bobo_1 [OP] Well-Known Member

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    Without a dyno there is no true way to know if it was worth it. I just know with the K&N CAI, headers, and exhaust the the computer need to be tuned for those changes. And I was not prepare to buy the X-One ECU programmer for just those changes. So, I got the next best thing. Seat of the pants says it was worth it.

    It was not plug and play but it was simple and took less than 30 minutes. You splice into all but one wire. For those I used a wire tap from autozone. For the one sensor wire I did cut and solder.
     
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