1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Throttle Body Improvement

Discussion in '80-Series Tech' started by GhostCruiser, Sep 12, 2003.

  1. GhostCruiser

    GhostCruiser

    Messages:
    55
    Likes Received:
    0
    Joined:
    Mar 28, 2003
    Considering upgrading the throttle body. It sounds like it would be about a 400 dollar investment. Is there enough value in this upgrade in relation to performance?
     
  2. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    whatchu upgrading to?

    details man! we need details!
     
  3. GhostCruiser

    GhostCruiser

    Messages:
    55
    Likes Received:
    0
    Joined:
    Mar 28, 2003
    larger bore and new butterfly
     
  4. Landpimp

    Landpimp GOLD Star

    Messages:
    14,682
    Likes Received:
    869
    Joined:
    Mar 14, 2003
    Location:
    PNW
    where are you finding this larger TB stuff for a 3fe?

    John H
     
  5. GhostCruiser

    GhostCruiser

    Messages:
    55
    Likes Received:
    0
    Joined:
    Mar 28, 2003
    i've got this info from a local performance company. You have to send the throttle body off to be bored out. They want to couple that with a high flow exhaust system.
     
  6. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    I have an intake/hi flow (cat back) and it makes a difference.

    Not sure on how much more a throttle body would do...if you do it let me know!
     
  7. GhostCruiser

    GhostCruiser

    Messages:
    55
    Likes Received:
    0
    Joined:
    Mar 28, 2003
    wouldn't a catback just affect the exhaust side?
     
  8. 92Cruiser

    92Cruiser

    Messages:
    121
    Likes Received:
    0
    Joined:
    Mar 28, 2003
    Dan,

    Where did you find a cat-back system for your 91?


    Brian
     
  9. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    PO did my cat back setup...welded a flange on behind the cat and went 2.5 all the way back (flowmaster muffler).

    It has an intake (3 or 3.5") under the hood with the biggest damn K&N I could find that would fit. Ordering the dust cover for the filter soon too.

    Doing one without the other is not a good idea....FYI
     
  10. Gumby

    Gumby Supamod Staff Member s-Moderator

    Messages:
    11,778
    Likes Received:
    307
    Joined:
    Dec 13, 2002
    Location:
    Knee deep in hookers and gin
    So is your big K&N open under the hood with no airbox?
     
  11. bjowett

    bjowett Supporting Vendor

    Messages:
    3,051
    Likes Received:
    544
    Joined:
    Oct 28, 2002
    Location:
    Western Massachusetts
    Not trying to rain on your parade, but I doubt (and I could be wrong, so just tell me to shut the f#$% up) the 3FE would benefit any real gains by going to a larger t-body. It already has a fairly large unit for the RPM range it operates in... Toyota did an excellent job taking the old F engine and placing EFI with beutiful manifolds (the intake side is great) on it. I know the stock t-body on my 4-Runner 22RTE is good for 500cfm in a normally aspirated condition. The 3FE unit, which is quite a bit larger than the 22RE unit, is is probably good for 650 - 750, that is just a guestimate. What you will get is a perceived increase in power due to more air entering the engine at less throttle opening. Save that $400 and put it towards the exhaust. The exhaust manifolds are look pretty good. The down pipe to the cat looks terrible, replace those with a nice mandrel bent sections of 2" or maybe 2 1/8" stainless, and do the 2.5" exhaust with a free flow muffler like Borla or Magnaflow. Any more real gains will be with head work.
     
  12. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    No airbox for now. I am working on that part (read: fun with plastics) :D

    I removed the fender intake assembly along with the rest of the air box, etc.

    I honestly don't think I NEED and airbox, but I do want one to make everything a little more organized.

    For what I do with it I don't think I will have issues as long as I run the K&N Dust cover for the filter.

    I have noticed no improvement in fuel economy but a drastic improvement in power off the line and at top speeds (highway).

    This is with the K&N and the cat back in combo.
     
  13. Hltoppr

    Hltoppr SILVER Star

    Messages:
    2,020
    Media:
    4
    Likes Received:
    3
    Joined:
    Aug 29, 2002
    Location:
    Port of Indecision...otherwise Northern Arizona
    I'm expecting fantastic performance gains from my 3FE when I install this! One on the rear and one on the hood, 'cuz it's full time 4wd, right!

    -H-
     
  14. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    Ordered my K&N pre-charger last night to fit my filter.

    I am running an 8 inch long tapered filter (5.5" in back, 4" in front, 3.5" inside flange)

    I plan on running the pre-charger all the time as I am not very trusting of the default filtering habits of the K&N.
     
  15. Gumby

    Gumby Supamod Staff Member s-Moderator

    Messages:
    11,778
    Likes Received:
    307
    Joined:
    Dec 13, 2002
    Location:
    Knee deep in hookers and gin
    [quote author=DanKunz link=board=2;threadid=5207;start=msg41186#msg41186 date=1063584572]
    No airbox for now. I am working on that part (read: fun with plastics) :D

    I removed the fender intake assembly along with the rest of the air box, etc.

    I honestly don't think I NEED and airbox, but I do want one to make everything a little more organized.

    For what I do with it I don't think I will have issues as long as I run the K&N Dust cover for the filter.

    I have noticed no improvement in fuel economy but a drastic improvement in power off the line and at top speeds (highway).

    This is with the K&N and the cat back in combo.
    [/quote]

    You might not have issues with dirt, but you are pulling underhood (hot) air into your intake. Cool air is more dense and will give you more hp. You need an airbox that pulls air in from outside the engine compartment like the safari snorkel or the stock airbox. Many of my students run K&N filters with no airbox. They think it's getting more power because you can hear more intake roar, but really it's just making more noise. K&N makes a factory replacement filter that allows you to run the stock airbox.
     
  16. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

    Messages:
    20,603
    Likes Received:
    2,981
    Joined:
    Mar 27, 2003
    Location:
    Surrounded by Cruisers from all over the world
    The Gummer has an excelent point. A couple weeks ago I was messing around under the hood and had my Bluepoint thermometer stuck down between the RH fender and the hood, just behind the headlamp. Hood closed, engine idling at operating temp, it read 179 degrees :eek: . Ambient was about 90 degrees +/-.
     
  17. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    I have the snoot of the filter in the fender (I have it all braced so it is quite neat-o).


    I wonder...any ideas on a box material?

    I wonder if I couldn't make a K&N airbox work for me....

    off to research!

    edit...

    I just found an old file cabinet that will sacrificing itself for the cause at lunchtime.

    I just need to find my tin snips :D
     
  18. DanKunz

    DanKunz

    Messages:
    8,855
    Media:
    2
    Likes Received:
    521
    Joined:
    Feb 7, 2002
    Location:
    Woodstock, GA
    Just wanted to update this thread (FROM THIS MORNING!!!)

    You all made me think and get all worked up.

    I am home from work so I took an old file cabinet, some tin snips, some fuel line, and some pliers and made me a air box.

    I have done more work on my truck in the past 14 days due to this board than I have in the past year!!
     
  19. landtank

    landtank SILVER Star

    Messages:
    18,423
    Likes Received:
    596
    Joined:
    Mar 27, 2003
    Location:
    Groveland MA
    I broke out my Downey catalogue. They offer 3mm oversizing. You send them your T-Body and they mill or have it milled and return it. This was out of a 2001 catalogue so things might have changed.
     
  20. landtoy80

    landtoy80

    Messages:
    5,668
    Likes Received:
    241
    Joined:
    Mar 13, 2003
    Location:
    North Front Range, CO
    [quote author=cruiserdan link=board=2;threadid=5207;start=msg41489#msg41489 date=1063661551]
    The Gummer has an excelent point. A couple weeks ago I was messing around under the hood and had my Bluepoint thermometer stuck down between the RH fender and the hood, just behind the headlamp. Hood closed, engine idling at operating temp, it read 179 degrees :eek: . Ambient was about 90 degrees +/-.
    [/quote]

    Time for a snorkle, that will cool it down.