Supercharged ls swap drivability.

Discussion in 'G-Body LS Swap' started by Jdigitty88, Feb 6, 2018.

  1. Jdigitty88

    Jdigitty88 Not-quite-so-new-guy

    Joined:
    Jul 4, 2016
    Messages:
    38
    Likes Received:
    32
    Trophy Points:
    18
    Background:

    I have a 4.8 swapped into my regal upgraded the injectors to fic 775's added a vortech supercharger and switched to SD. For the drivetrain, it has the stock th350 (I know won't last) and 8.5 rear diff with stock gears.

    Issue:

    This is my first supercharged car. I started tunning with hp tuners I have part throttle ok. When I go to tune WOT I go in third start at 2500rpm but it falls on its face. I don't have the kick down connected if I downshift it's much better.

    I think I answered my own question after typing this out but will I get the same affect if tune WOT in second?



    Pic for attention:
    20180128_152724.jpg
     
    • Like Like x 3
  2. zdeckich

    zdeckich Master Mechanic

    Joined:
    Jun 23, 2013
    Messages:
    482
    Likes Received:
    230
    Trophy Points:
    43
    Location:
    Fort Worth, TX
    What size is the blower and what pulley with how much boost? and whats the fuel injector duty cycle? pump gas or e85?
     
  3. Turbolq4

    Turbolq4 G-Body Guru

    Joined:
    Sep 25, 2017
    Messages:
    674
    Likes Received:
    565
    Trophy Points:
    93
    Location:
    Boise Idaho
    Do you have a wideband O2 sensor? My guess is that the mixture is way off at low RPM, wot situations.
     
  4. Turbo Zach

    Turbo Zach G-Body Guru

    Joined:
    Sep 8, 2015
    Messages:
    920
    Likes Received:
    855
    Trophy Points:
    93
    Location:
    50130
    Do you have a knock gauge and a wide band? I would be scared to be messing around with out them.
     
    • Agree Agree x 1
  5. Jdigitty88

    Jdigitty88 Not-quite-so-new-guy

    Joined:
    Jul 4, 2016
    Messages:
    38
    Likes Received:
    32
    Trophy Points:
    18
    So for some reason, I didn't save any of logs. As soon as it stops raining I will get a log but from what I can remember I don't think it went over 50% DC.

    It's 93 octane pump gas The charger is V-3 SCi Supercharger with 3.60. I'm working my way up so hasn't seen more than 5 PSI I do have a Wideband logging it through Hp tunners and using the stock Knock sensors also logging that. It hasn't seen Knock.
     
  6. motorheadmike

    motorheadmike Royal Smart Person

    Joined:
    Nov 18, 2009
    Messages:
    2,351
    Likes Received:
    2,138
    Trophy Points:
    113
    Location:
    Ottawa, Ontario Canada
    1. Is your injector data correct?
    2. Is this OL Speed Density? I don't see a MAF.
    3. Is your MAP sensor scaled properly?
    4. Is your IAT scaled properly?
    5. Have you confirmed fuel pressure under load? What is your IDC?
    6. Did you start with someone else's tune? I hope not.

    Tuning a boosted engine is not where a novice should start.
     
    • Informative Informative x 1
  7. 64nailhead

    64nailhead G-Body Guru

    Joined:
    Dec 1, 2014
    Messages:
    592
    Likes Received:
    311
    Trophy Points:
    63
    Location:
    Upstate NY
    If I were you, then I'd unhook the charged pipe and tune it with the new injectors and SD NA. Once it runs, idles hot and cold and accelerates correctly, then it will be as simple as changing the fuel and timing tables when the charged pipe is hooked back up. That is easy info to steal from someone elses tune - just over fuel it and under time it.

    Other than that, I'm with Mike - very demanding to learn HP tuners and work out any bugs when into boost.
     
  8. Jdigitty88

    Jdigitty88 Not-quite-so-new-guy

    Joined:
    Jul 4, 2016
    Messages:
    38
    Likes Received:
    32
    Trophy Points:
    18
    Update time:
    So I took yall's advice and checked everything listed also got Master EFI Tuner Book.

    Injector data is from fuel injector clinic, Map and iat are correct. I started from the stock tune.

    It drives and I think I have the Ve tables situated definitely drivable AFR"s are correct with CMD AFR's. I haven't touched the timing yet because I have two issues right now.

    Exhaust and IAT

    The Exhaust is 2 into one all 2in same routing as stock. I'm pretty sure that is choking the engine.
    The IAT on a cool 60-degree day, start at 104 and at the end of a 1/8 mile run are at 140. Looks high to me IDK

    What do yall think should be next intercooler or exhaust?
     
  9. fleming442

    fleming442 Comic Book Super Hero

    Joined:
    Dec 26, 2013
    Messages:
    2,622
    Likes Received:
    949
    Trophy Points:
    113
    Yes!:D
     
Loading...
Similar Threads - Supercharged swap drivability Forum Date
COMPLETE LS SWAP MPG G-Body LS Swap Jun 12, 2018
El camino 5.3 lm7 swap G-Body LS Swap Jun 5, 2018
Cruise Control LS Swap DBC G-Body LS Swap May 16, 2018
A/c with Ls Swap G-Body LS Swap May 2, 2018
El Camino LS swap fuel tank G-Body LS Swap Apr 19, 2018

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice