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Thread: Fuel Ignition Map for modified LSJ

  1. #1
    n00b
    Join Date
    Jan 2017
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    United States

    Fuel Ignition Map for modified LSJ

    I have visited the forum a bunch of times for info on the LSJ engine, as I was planning to install this into a 1986 Lotus Esprit (the original engine had an engine fire and the car sat outside for 10 years in CT with no side windows and no rear hatch and no valve cover (the car was exactly what I was looking for...a real challenge to get it back on the road....but I am not constrained with keeping it original)

    I am completing the build of a LSJ motor going into a 1986 Lotus Esprit

    Upgrades include new POWER BORe Sleeves, Diamond forged 9.5:1 pistons, K1 Technologies forged rods, Total Seal piston rings, Comp Cam stage 2 cams, Supertech upgraded valve springs/retainers/valves, custom headers, larger capacity injectors, TVS, custom intake, LS1
    throttle body
    , ATI Balancer, polished crank and cam journals, return fuel line, aluminum/steel flywheel, all running on MEFI4B controller.

    Note: I am using a mechanical throttle body from an LS1 engine, as the MEFI4B cannot control an electrical
    throttle body

    Not looking for ultimate power, just a nice reliable street machine

    I have access to an engine dyno but would like to have a good starting map, as Total Seal recommends running at 2000 rpm for 20 minutes for the initial break-in. I would prefer not having to start and stop the dyno while trying to set the engine map

    If you have a build similar and would be will to share you map, it would be appreciated.
    you can reach me at
    dlgsmith2@yahoo.com

  2. #2
    Fermion
    Join Date
    Dec 2017
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    56
    Country
    United States
    I have seen a few that have worked on LSJ's on the forum, but its not as popular these days. Eddie did one years back. The Brammo Atom 2's with the Ecotec are 10 years old now. I happen to own one with the LSJ, I believe a stage 2 supercharged 245HP edition. I know there are stage 3 ones too at 300 HP but some of the other members were discussing it years ago that the Brammo 300 HP performs similarly due to a less than optimal intercooler setup. Was never able to figure out exactly what that was.

    Where are you out of?

    Quote Originally Posted by MadMaxAtom View Post
    If you fix the brammo intercooler wiring and plumbing issues, and put at least a decent muffler on the car, you will see an increase in horsepower between a stage 1, 2 and 3 GM tune. I have swapped a stage 2 tune and a stage 3 tune on the same car, same day, same dyno and the stage 3 tune is good for a 30-35whp bump over the stage 2,with NO increase in EGTs,and safe air/fuel ratios. The problem with the brammo Ecotecs from the "factory" was not the hardware..it was how that hardware was installed..which turned out to be incorrect many times. Once you straighten out those issues, there is a benefit to the different stage tunes.
    https://www.arielatomchat.com/forums/thread2017.html

  3. #3
    n00b
    Join Date
    Jan 2017
    Posts
    4
    Country
    United States
    Located in Rochester NY

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