Results 1 to 11 of 11

Thread: Throttle Body Tuning

  1. #1
    Potential Tuner
    Join Date
    Jan 2021
    Posts
    2

    Throttle Body Tuning

    Ok, so I am a bit new to the whole tuning game, but over the past few weeks I?ve gotten a little grip of things. I just had the question of what should I tune if I want to install a CAI and a larger throttle body? Should it be volumetric efficiency and speed density. I don?t have a MAF sensor in my car anyways.

  2. #2
    what vehicle is it on?

  3. #3
    Multiply the throttle body airflow model by the percentage of increase in size of the throttle body. The effectiveness of your result will allow the car to be in closed loop normal and not hang in open loop off pedal or cruising. If you're wrong, part throttle trims long term wont populate. This works well for electronic throttle bodies for cars like challenger 6.1 and very frustrating when done on an srt4.

  4. #4
    Advanced Tuner
    Join Date
    Jan 2021
    Location
    Miami
    Posts
    351
    so raising the numbers will increase the air flow or decrease airflow? if throttle body is 15% larger and multiply the numbers by 15% is raising the numbers so im assuming it raises the airflow by raising the numbers but i want to sure im assuming correctly.
    By the prickle of my thumb something wicked this way comes!2008 Chrysler 300c! 2013 heads/220/230 comp cam/LTheaders/FTI 2600 stall converter.

  5. #5
    Advanced Tuner rays04gtx's Avatar
    Join Date
    Oct 2021
    Location
    Allentown PA
    Posts
    363
    62 Biscayne 425/409 SS/D stock class car 10.60s
    66 Dart 426CIG3 8.60@171 2750lbs Naturally asperated
    04 Ram All Alum , 468Ci G3 10.50s @4800 lbs Naturally asperated
    04 Rumble Bee, built 6.1 ,4000lbs 10.48 @ 129s MPH. Naturally asperated
    05 Rumble Stock 5.7, 3.92s TUNE ONLY 13.94@98mph

  6. #6
    every car is different, i found the best for me was to increase .5v and lower 10%-15%, and everything above .5v lower 10%. then go into the driver demand and make all the tables the same. then you can play with those numbers. just make very small adjustments. like 5% increments. with the trottlebody table, you are tricking the computer into thinking the tb is a different size, and the driver demand tables, you are telling the computer to tell the tb how much to open based on peddle position
    2019 challenger rt
    k&N cold air intake
    92mm hellcat throttlebody
    ported 392 intake manifold
    ported eagle heads
    Cammotion custom 222/234 cam
    stainless works long tube headers and catless mid pipes
    3' catback with h-pipe & pypes violator mufflers
    e-85 tuned

  7. #7
    Advanced Tuner rays04gtx's Avatar
    Join Date
    Oct 2021
    Location
    Allentown PA
    Posts
    363
    Quote Originally Posted by james1595 View Post
    every car is different, i found the best for me was to increase .5v and lower 10%-15%, and everything above .5v lower 10%. then go into the driver demand and make all the tables the same. then you can play with those numbers. just make very small adjustments. like 5% increments. with the trottlebody table, you are tricking the computer into thinking the tb is a different size, and the driver demand tables, you are telling the computer to tell the tb how much to open based on peddle position

    YES ever car is different, sometimes we can't stress that fact enough.
    62 Biscayne 425/409 SS/D stock class car 10.60s
    66 Dart 426CIG3 8.60@171 2750lbs Naturally asperated
    04 Ram All Alum , 468Ci G3 10.50s @4800 lbs Naturally asperated
    04 Rumble Bee, built 6.1 ,4000lbs 10.48 @ 129s MPH. Naturally asperated
    05 Rumble Stock 5.7, 3.92s TUNE ONLY 13.94@98mph

  8. #8
    Advanced Tuner rays04gtx's Avatar
    Join Date
    Oct 2021
    Location
    Allentown PA
    Posts
    363
    Quote Originally Posted by Turbo2gnx View Post
    so raising the numbers will increase the air flow or decrease airflow? if throttle body is 15% larger and multiply the numbers by 15% is raising the numbers Yes , Increasing the #s on the 35035 table will "increase" airflow.


    Yes Increasing the #s will "Increase Airflow"

    When we were trying to break in to the 13's with the 05 Bee , my daughter had that thing knocking on the door , 14.10,14.05 a pair of back to back 14.01@ 96mph, we had the MPH to get it a 13.9X...................
    TB airflow table.......it was one of the few things we hadn't played with yet.
    1st thing I did was rescale the "row Axis" table , dropped the top from 3.90 to 3.80 and smooth it out , I decreased everything under .051V,(X.70) and everything above .51v lowered it also (X.85) her 60ft dropped from 1.98 to 1.89 on the next pass and BAM 13.94@98 then backed that up with a 13.94@ 97.5MPH

    So like James1595 said , each car(truck) reacts differently, we picked up 2mph by lowing the top of the table, and dropped our 60 ft time .1. at 1st I thought I had the AFR to rich, but looking at the logs from those runs the O2s were at the same voltage as the stock Airflow table, but the interesting thing was the stock airflow tables the truck Never Hit 100KAP during the runs after changing the tables it hit 100kpa on both 13.9X runs, ..., keep in mind this Bee was 95% as delivered from DCX in 2005, truck had 45k original miles on it, still runs the factory air box, (K&N filter) Cast iron manifolds, only deviations from stock was a cat back system split into duals, M&H drag radials on Forge Star wheels, fronts are Forge star also, M&H tire I forget the size but its a narrow tire, race weight was 4790.
    When we switched the Intake manifold over from the Truck style(03-08) to the LX style(05-08), it ran like crap with that modified table, I switched the airflow table up similar to James1595 set up, increased .51 and under to 10%(X1.10) and kept the top #s the same(lowered from stock table 15% X.85) and the Bee loved it.so im assuming it raises the airflow by raising the numbers but i want to sure im assuming correctly.
    Attached Images Attached Images
    62 Biscayne 425/409 SS/D stock class car 10.60s
    66 Dart 426CIG3 8.60@171 2750lbs Naturally asperated
    04 Ram All Alum , 468Ci G3 10.50s @4800 lbs Naturally asperated
    04 Rumble Bee, built 6.1 ,4000lbs 10.48 @ 129s MPH. Naturally asperated
    05 Rumble Stock 5.7, 3.92s TUNE ONLY 13.94@98mph

  9. #9
    Advanced Tuner
    Join Date
    Jan 2021
    Location
    Miami
    Posts
    351
    thanks for the reply, its appreciated! my throttle body is a 08 but the intake and injectors are from a 2013+ with the eagle heads, how would you recommend on how to tune that, how do i manage the airflow with that setup, dont know what to set the max airflow limits and dynamic airflow.
    By the prickle of my thumb something wicked this way comes!2008 Chrysler 300c! 2013 heads/220/230 comp cam/LTheaders/FTI 2600 stall converter.

  10. #10
    Advanced Tuner
    Join Date
    Jan 2021
    Location
    Miami
    Posts
    351
    and having fun(not) with getting the injector scaled correctly, im sure with all those areas off, it would explain my misfires at stratup and while driving and poor performance or lack there of! im getting too old for the tuning, im trying but after 10 mins, im thinking about 99 things but the tune! the first few mins of looking and reading the tune and its logs, it gets confusing and i get fustrated and give up. its been an eye opener on getting old with autism and ADD. i will try the info you gave about scaling the airflow area for throttle and see if any changes, thanks again,greatly appreciated!
    By the prickle of my thumb something wicked this way comes!2008 Chrysler 300c! 2013 heads/220/230 comp cam/LTheaders/FTI 2600 stall converter.

  11. #11
    Advanced Tuner
    Join Date
    Jan 2021
    Location
    Miami
    Posts
    351
    ok i just opened the tune and i have it set the same way you have your final tune for the throttle body.
    By the prickle of my thumb something wicked this way comes!2008 Chrysler 300c! 2013 heads/220/230 comp cam/LTheaders/FTI 2600 stall converter.