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Thread: LS3 transplant / conversion

  1. #1
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    Default LS3 transplant / conversion

    Hey people, an interesting job has fallen into my lap today.....A LS3 engine turned up on a pallet today at work....as they do..... and its going into a VT II GTS Holden. No lollipops to guess what happened to the old engine

    Any way, has anyone here been involved in such a swap? We're sticking with the LS1 ECU of course and the customer has supplied all the other parts for the swap such as the crank decoder box, knk sensor extension leads , manual throttle body etc etc . So we're just fitting and tuning.
    Resitting the injector calibration files for the different LS3 injectors, cylinder head volume in VE tables, is there anything else I need to do other than start with a good base tune that I need to know or change in the LS1 5.7L ECU calibration??
    Has anyone got a LS3 tune they can post up, I spose they would be very simlar to an E38 VE 6L tune?
    Cheers,
    Mike
    "Just a tune > yeah right !!!! "

  2. #2

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    the only one i have got is a stock LS3 corvette tune if this helps
    Attached Files Attached Files
    330 rwkw EFILIVE OS 01290005 SD Cam / Head Tuned 6 speed VY SS Commodore
    10/71 Blown 572 Big Block Chev HQ 2 Door Monaro

    GM Performance Centre
    Busselton WA
    AUSTRALIA
    Phone: 0447 003050

  3. #3
    Lifetime Member Biggsy's Avatar
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    Here is a manual 6.2 HSV maloo
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    Dave.

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    thanks guys....
    "Just a tune > yeah right !!!! "

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    any other pointers people?????
    "Just a tune > yeah right !!!! "

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    interestingly enough I've opened both those maps expecting the spark maps to be very similar. Not the case....

    The corvette tune has a nearly "perfect " map shape that would only need adjusting to suit octane and any bolt on air flow mods. I'm impressed. Why on earth didn't they run that in the HSV tune???????
    "Just a tune > yeah right !!!! "

  7. #7
    EFILive Reseller ringram's Avatar
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    I thought they detuned the HSV because of the trans!?
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

  8. #8
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by The Alchemist View Post
    Why on earth didn't they run that in the HSV tune???????
    Modified for Australian conditions
    I no longer monitor the forum, please either post your question or create a support ticket.

  9. #9
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    Quote Originally Posted by GMPX View Post
    Modified for Australian conditions
    mmm I wonder how it would go in our tropical kiwi conditions
    If I had enough money to by one I would find out !!!
    Last edited by The Alchemist; March 8th, 2009 at 05:40 PM.
    "Just a tune > yeah right !!!! "

  10. #10
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    Not sure what category this should be in, ls1? General? Ls3? Anyways heres the update.....
    The physical conversion on the engine went smoothly with only the bearing in the back of the crank having to be changed to fit the gear box input shaft. The crank and cam triggers were taken care of by a decoder box supplied by the customer. A simple plug in intercept box. Knock sensors relocated and map sensor relocated with extension looms.
    The engine externals all swapped over ok with no problems.
    The engine was fitted with 3inch outlet 4 into 1 pacemakers and a twin 3 inch X-force stainless exhuast system with stainless "cat removal" pipes.
    Intake was mafless OTR .
    The engine was a standard LS3 with standard camshaft.
    Mapping was fairly straight foward . I started with a standard LS1 map for a GTS. Swapped over the MAP scalar from an LS3 map, injector Flow rate table recalculated for the LS3 42 lb injectors and cylinder head volume settings from a LS3.
    I did a full VE tune from 25 kpa to 100kpa up to 5000 rpm then the full load runs. Having done many SSV's with the L92 heads I used similar timing to a L92 as a base then did a full tractive effort timing on the dyno.
    Rafig, T/Cracker/follower, base timing map, parked airflow all needed minor tweaks nothing major really for a perfect result.
    The end result blew me away.....If any of you have any doubt as to the tractibility of the LS3 and its power potential now is the time to dispell them.
    A good tuned manual LS1 with all bolt on externals like exhuast & cold air intake etc makes about 220kw at the wheels on my Dyno Dynamics dyno.
    A Good tuned 6L LS2 with bolt ons is good for 230 to 235kw at the wheels.
    A good tuned 6L SSV VE (L98 engine) with bolt ons makes about 230kw at the wheels.
    This LS3 made 280 kw at the wheels!!!!! with huge torque to boot. On the road throttle response was instant, torque was there in any gear and when the thing got on song over 4000rpm all hell broke loose
    Once the warranty is out in 6 months time we'll be doing the camshaft and valve train , probably a nice comp 228/228, 580thou lift jobbie should do the trick. God knows what it will do then .....

    Click image for larger version. 

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    Last edited by The Alchemist; March 11th, 2009 at 03:40 PM.
    "Just a tune > yeah right !!!! "

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