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Thread: Help with new LS2 403 replacement in C5

  1. #1
    Senior Member ArKay99's Avatar
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    Default Help with new LS2 403 replacement in C5

    I know it's been a while since I've been here. The last post I made here was regarding destroying my h/c LS1 by dropping a washer in the intake port of hole #7 and crushing the piston, etc.

    I now have a brand new LPE 403 in built for NA. I had Tony Mamo from AFR repair and port my 'little' AFR 205's, and I'm running a Comp XER ground to 242/242 .610"/.610" 114lsa + 2. The SCR is right at 11.5:1 and DCR is 8.34:1 with a .040" quench height. I will be running my Jesel SS rockers and will set the wipe pattern etc. I am putting Kooks 1 7/8" headers through a 3" X and midsection into my Z06 Ti catbacks. The intake is a VaraRam B2 into a Nick Williams 90mm TB and a Tony Mamo ported FAST 90. I also pulled the drivetrain while the motor was out and installed a DTE tranny brace and replaced my SPEC 3 with a Textralia 0700 Z-Grip.

    Hopefully I'll have it together and up and running early next week. Since it is a brand new motor I want to get out on the road and put a load on the rings to seat them as quickly as possible.

    I have been using EFILive for ~2.5yrs, my serial number is 12 and had my old motor tuned in very well. I am using a 2002 Z06 OS in my 99 C5 PCM. I also have a PLX M-300 to use for AFR monitoring and tuning.

    Ok, having given the history, the new motor specs, and my intentions, here is my question.

    Since my MAF is tuned in, along with VE table and spark maps, what would I have to do to get me 'in the ballpark' with a conservative 'break-in' tune to get my AFR's in line quickly?

    My first thoughts are:
    1) Leave all fuel and air alone except for B0104 Cylinder Volume. I think I should calculate my new cylinder volume and enter it there. 4.005 bore x 4.0 stroke.

    2) Change B3613 from 15 to 105 - PE MAP threshold.

    3) Pull 2-3 degrees of timing across the board on both the high and low octane spark map. - It currently is 28* @ WOT.

    I want to give the motor a 'window' for AFR range so the fuel trims line up quickly so I can start pulling on hills and vaying rpm's and load quickly.
    I don't have access to a dyno unless I drive 50 miles or so to the nearest one.

    Am I going in the right direction? If not, what should I do?

    Go:LPE 403, VaraRam, Haltech, PowerMax 100mm MAF, Tony Mamo ported FAST90/NW90, 160* stat, Kooks, TI's, DRM cutouts, Ripper, 4:10's, Tex OZ700, QA1's, Tony Mamo ported AFR 205's, 242/242 .610/.610 114LSA+2, Yella Terras, 42lb/hr Green tops, ASP UD pulley, 2 AMW catch cans

    Show: Euro tails & mrkrs, Z06 chromes/Pilots, 300Wx2 Bolt w/12" Sub,
    red calipers & black rear letters, Zaino.
    530 RWHP, 479 RWTQ

  2. #2
    Lifetime Member mr.prick's Avatar
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    there is a big difference from stock displacement to stroker
    in regards to the VE and MAF.
    you will need to completely change both no matter what.
    also you should be careful not to run to rich
    on first start of a new motor.
    here is what my 383 lS1 VE table looks like.
    Click image for larger version. 

Name:	VE {B0101}.jpg 
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ID:	2649

  3. #3
    Lifetime Member limited cv8r's Avatar
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    have you looked at any of the modified tunes at "holden crazy"? Might give you some ideas or somewhere to start.
    It's all good until it goes "Bang"

  4. #4
    Lifetime Member Bruce Melton's Avatar
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    LS2 tb?
    Injectors?
    Can you deal with a 02 Z06 OS?

    Send me an email and I will dummy something up that will get you going. I had a couple of 402s.

    2000 C5 Coupe, 6M, Callies/Mahle stroked LS7 (441), Blackwing, Halltech, LS3 intake, 90mm Shaner TB, ported L92 heads, FAST 50# inj, not too much cam, Kooks 1 7/8" headers , 3" catless mid pipes, Z TIs, track suspension, , 3:90 rear, EFI V2, LM-2, etc.
    PowrMax Performance

    100 mm PowrMAF

    LM-2 EFILIve package with TAQ -sLM2 V-2 serial cable> Package deals

  5. #5
    Senior Member ArKay99's Avatar
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    Email sent.

    Go:LPE 403, VaraRam, Haltech, PowerMax 100mm MAF, Tony Mamo ported FAST90/NW90, 160* stat, Kooks, TI's, DRM cutouts, Ripper, 4:10's, Tex OZ700, QA1's, Tony Mamo ported AFR 205's, 242/242 .610/.610 114LSA+2, Yella Terras, 42lb/hr Green tops, ASP UD pulley, 2 AMW catch cans

    Show: Euro tails & mrkrs, Z06 chromes/Pilots, 300Wx2 Bolt w/12" Sub,
    red calipers & black rear letters, Zaino.
    530 RWHP, 479 RWTQ

  6. #6
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    what does changing the PE map threshold do or how does it have an effect on tuning??

  7. #7
    Senior Member ArKay99's Avatar
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    Quote Originally Posted by BrianC98Z28
    what does changing the PE map threshold do or how does it have an effect on tuning??
    By changing it to 105kPa it keeps the PCM from going into PE mode. On first startup I don't plan on going WOT so I want to make sure it stays out of PE.
    I was asking if that would be something I should do, not something I advocate doing.

    Go:LPE 403, VaraRam, Haltech, PowerMax 100mm MAF, Tony Mamo ported FAST90/NW90, 160* stat, Kooks, TI's, DRM cutouts, Ripper, 4:10's, Tex OZ700, QA1's, Tony Mamo ported AFR 205's, 242/242 .610/.610 114LSA+2, Yella Terras, 42lb/hr Green tops, ASP UD pulley, 2 AMW catch cans

    Show: Euro tails & mrkrs, Z06 chromes/Pilots, 300Wx2 Bolt w/12" Sub,
    red calipers & black rear letters, Zaino.
    530 RWHP, 479 RWTQ

  8. #8
    Lifetime Member 98 tigershark's Avatar
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    On Holden crazy there is a 2003 vette 6.5 liter. It has a nice tune. I think Bruce's offer is a very good one.
    98 tigershark
    L92/427 w/L76 CC'ed heads n upgraded springs
    4.100 stroke, 4.068 bore w/ 11:1 comp
    Cam, 591 int, 613exhst, 232-246dur@.050, 115*
    LG headers, High flow cats,
    RPM level 5 trans, RPM 3.42 gears, 2800 rpm trq convrt. .
    Special Thanx to Joe and Bruce!

  9. #9
    Senior Member ArKay99's Avatar
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    Quote Originally Posted by 98 tigershark
    On Holden crazy there is a 2003 vette 6.5 liter. It has a nice tune. I think Bruce's offer is a very good one.
    I will check that out. I received Bruce's tune and will use that as a starting point. Thanks Bruce.

    Go:LPE 403, VaraRam, Haltech, PowerMax 100mm MAF, Tony Mamo ported FAST90/NW90, 160* stat, Kooks, TI's, DRM cutouts, Ripper, 4:10's, Tex OZ700, QA1's, Tony Mamo ported AFR 205's, 242/242 .610/.610 114LSA+2, Yella Terras, 42lb/hr Green tops, ASP UD pulley, 2 AMW catch cans

    Show: Euro tails & mrkrs, Z06 chromes/Pilots, 300Wx2 Bolt w/12" Sub,
    red calipers & black rear letters, Zaino.
    530 RWHP, 479 RWTQ

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