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Thread: What are your MAP readings?

  1. #1
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    Default What are your MAP readings?

    Looking for MAP values at idle for both STOCK AND AFTERMARKET cams.
    If your cam is not stock, please state the specs if known.

    For example, my stock cam was around 45kpa, my aftermarket (in sig)
    72kpa. Stock 03Z cam in a 12:1 416, 29kpa.
    07 Silverado DMax Classic
    02 Z06 LS3 416, 805rwhp, TFS245, Wiseco, Callies Crank/Rods, Iskendarian Lifters, Crower Rockers, FAST102/90, ATI Damper, 1-7/8 Kook's LT, QkTime Shield,Tolle-Fab 8pt
    Old Engine: 1/4mile = 9.6/146 New Engine:?

    EFI Live Tune/Scan v7.5.27, EFI Live Scan and Tune v8.2.23, build 276, BootBlock 2.07.06, FirmWare 2.07.52, 512K RoadRunner (12.14.R), Innovate Serial LC2x2


    COS5/12212156 For 2002 Z06 Manual Vette

  2. #2
    Lifetime Member mr.prick's Avatar
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    I don't know what my cam specs are in my 383 but MAP @ idle averages 45.6 kPa and
    85 kPa max @ mile high altitude.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  3. #3
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Stock: ? ..To long ago..

    Aftermarket Cam: 228/232 110+2 (10 degrees of overlap): ~ 48 kPa at 5400'..equates to ~ 66 kPa at sea-level.

    Idle: 800 RPM's (M6)..24 degrees base timing..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  4. #4
    Lifetime Member swingtan's Avatar
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    MAP readings will vary widely with the chosen idle spark settings. For example...

    220/224 @ 114

    Code:
    Base Spark     MAP kPa
    
       22'         39
       20'         45
       16'         46
       15'         47
       13'         48
       12'         50
    Simon.

    Compared to the stock cam

  5. #5

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    here's mine

    224/228 598 thou lift 112 lobe
    14 deg base idle timing
    60 kpa at 800 rpm idle (operate temp)
    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

  6. #6
    Joe (Moderator) joecar's Avatar
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    2001 stock LS1 (196/207 116):
    36 kPa
    564 rpm
    Timing 26°
    ECT 194°F
    MAF 6g/s
    thru stock exhaust manifold

    I can look thru some logs to see what difference LT headers make... or I can put them back on soon (I also got LS6 heads/cam I can put on).

  7. #7
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    ZO6:

    Nice sound clip!!!

    Quote Originally Posted by swingtan View Post
    MAP readings will vary widely with the chosen idle spark settings. For example...

    220/224 @ 114

    Code:
    Base Spark     MAP kPa
    
       22'         39
       20'         45
       16'         46
       15'         47
       13'         48
       12'         50
    Simon.

    Compared to the stock cam
    Swingtan thats an interesting association you show with Base Spark and MAp kPa. I probably did not realize it was that dependent on base spark. I ended up with the 20-24 base spark at Idle, but your chart does make a lot of sense.
    Quote Originally Posted by joecar View Post

    I can look thru some logs to see what difference LT headers make... or I can put them back on soon (I also got LS6 heads/cam I can put on).
    Joecar, it might be interesting to see how your car may do with some additional mods. There are times I wish I had the bucks to have one LS1 modded, and one completely stock. Sometimes I forget how nice these cars are just totally stock. Though I must say I would have a hard time without an aftermarket exhaust and headers.

    I know being in California it probably is not easy. But even a 'milder' cam and a little head work can add to the driving experience. I ran a 'smog' cam 220/220 114 for awhile. I actually liked that cam. Mod fever is hard to break though!

    OP, sorry to divert. Thats a nice 1/4 mile time you have. Is this your 'street-car', or just track?
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  8. #8
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    Quote Originally Posted by WeathermanShawn View Post
    ZO6:
    ...
    OP, sorry to divert. Thats a nice 1/4 mile time you have. Is this your 'street-car', or just track?
    I recently yanked the license plates off of it, then later changed my mind when reality set in that I couldn't drive it this summer. I guess that defines it as a mostly strip, some street.

    I'm adding a 255/263 cam and turn downs soon. (to experience a June race that is coming up; it will get trailored for that). I'll post up a WMV when available.

    Thanks for the data guys. I am just interested in how diff cams and LSAs affect vacuum.

  9. #9
    Senior Member
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    2000 LS1
    Thunder Road TR230 Cam 230/224 111)
    57 kPa
    826 rpm
    Timing 21°
    ECT 85°C
    MAF 9g/s
    Tubular manifold, 2.5" Duals

    Rgds

    Jim
    2000 LS1 M6, No EGR/Air/PS/CATs. TR230 Cam, COS3, OLSD, LC1 Wideband fitted, Procharger P1SC, 2 Bar MAP, Siemans Dekka 60Lb Injectors.
    All wrapped up in a 2000Lb AC Cobra Replica

  10. #10
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    excellant illistration! I often change the in gear spark by 3 to 4 degrees lower timing so you get a nice fat off beat when sitting at the lights yeah baby

    Quote Originally Posted by swingtan View Post
    MAP readings will vary widely with the chosen idle spark settings. For example...

    220/224 @ 114

    Code:
    Base Spark     MAP kPa
     
       22'         39
       20'         45
       16'         46
       15'         47
       13'         48
       12'         50
    Simon.

    Compared to the stock cam
    "Just a tune > yeah right !!!! "

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