Results 1 to 14 of 14

Thread: Boost lag test, 24.1psi result in 1.074 second.

  1. #1
    turbo addict
    Join Date
    Dec 2005
    Location
    Mesa, AZ
    Posts
    7,351

    Boost lag test, 24.1psi result in 1.074 second.

    Since I can do all kind of logging with MS, I thought I would do a boost lag test. Test was done in third gear.

    39.915 seconds since log started, 4475RPM, -3psi (vacuum)


    40.989 seconds since log started, 4973RPM, 24.1psi


    Boost Lag, 1.074 second from -3psi to 24.1psi in 3rd gear.

  2. #2
    Garrett booster
    Join Date
    Jul 2015
    Location
    Kansas City
    Posts
    59

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Damn man. My SRT-4 doesn't even boost that fast.

  3. #3
    turbo addict Turbo Mopar Contributor
    Join Date
    Dec 2005
    Location
    Seattle
    Posts
    7,063

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Directly feeding knock sensor or teeing off?
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  4. #4
    turbo addict
    Join Date
    Dec 2005
    Location
    Mesa, AZ
    Posts
    7,351

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by Ondonti View Post
    Directly feeding knock sensor or teeing off?
    Neither.
    http://www.turbo-mopar.com/forums/sh...=1#post1131177

  5. #5
    Hybrid booster
    Join Date
    Jan 2007
    Location
    Merrimack, NH
    Posts
    880

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by tryingbe View Post
    Since I can do all kind of logging with MS, I thought I would do a boost lag test. Test was done in third gear.

    39.915 seconds since log started, 4475RPM, -3psi (vacuum)


    40.989 seconds since log started, 4973RPM, 24.1psi


    Boost Lag, 1.074 second from -3psi to 24.1psi in 3rd gear.
    have a hard time understanding how that turbo can spool that fast...

  6. #6
    Supporting Member II Turbo Mopar Contributor Shadow's Avatar
    Join Date
    Dec 2006
    Location
    Aubigny, Manitoba, Canada
    Posts
    5,088

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Not sure what you guys are looking at to quantify "fast". An SRT-4 stock turbo spools 3x as fast as what is shown here.

    What I'm looking at seems about average for what this turbo with the supporting mods Should spool at..........

    Robert Mclellan
    http://www.youtube.com/watch?v=wambNdfnu5M
    10.04 @ 143.28mph (144.82 highest mph)
    Worlds fastest 8v MTX Shelby Charger
    Manitoba's Fastest 4cyl!
    8 valve, No Nitrous!
    New clutch combo is the SH!T!

  7. #7
    Hybrid booster
    Join Date
    Jan 2007
    Location
    Merrimack, NH
    Posts
    880

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by Shadow View Post
    Not sure what you guys are looking at to quantify "fast". An SRT-4 stock turbo spools 3x as fast as what is shown here.

    What I'm looking at seems about average for what this turbo with the supporting mods Should spool at..........
    That's what I was meaning, on an 8 valve I think that's a pretty quick spool up

    Sent from my SM-S903VL using Tapatalk

  8. #8
    Supporting Member II Turbo Mopar Contributor Shadow's Avatar
    Join Date
    Dec 2006
    Location
    Aubigny, Manitoba, Canada
    Posts
    5,088

    Re: Boost lag test, 24.1psi result in 1.074 second.

    And don't get me wrong, this is in No way a shot at tryingbe, as I think he's doing an Excellent job of working things out to the point where he should be close to laying down some Good #'s on his set-up.

    If anything, I think this just highlights that Most Struggle to get things sorted out and never seen the kind of success others have had and so it all Seems smoke and mirrors.

    Robert Mclellan
    http://www.youtube.com/watch?v=wambNdfnu5M
    10.04 @ 143.28mph (144.82 highest mph)
    Worlds fastest 8v MTX Shelby Charger
    Manitoba's Fastest 4cyl!
    8 valve, No Nitrous!
    New clutch combo is the SH!T!

  9. #9
    Hybrid booster
    Join Date
    Jan 2007
    Location
    Merrimack, NH
    Posts
    880

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by Shadow View Post
    And don't get me wrong, this is in No way a shot at tryingbe, as I think he's doing an Excellent job of working things out to the point where he should be close to laying down some Good #'s on his set-up.

    If anything, I think this just highlights that Most Struggle to get things sorted out and never seen the kind of success others have had and so it all Seems smoke and mirrors.
    Me either. I can't data log my Lancer, but I guarantee that it does not spool that quick even with the big valve ported head, ported 2 piece intake, TU exhaust manifold, and triple BB Comp turbo.

  10. #10
    Hybrid booster
    Join Date
    Mar 2009
    Location
    Tampa Bay
    Posts
    382

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Just remember, -3 psi is pretty much spooled up already, it'd probably take if he were at 10-20 inHG
    Last edited by EaZyE426; 10-24-2017 at 07:51 PM.

  11. #11
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Boost lag test, 24.1psi result in 1.074 second.

    What was the start RPM of your test?
    I think what you've shown here is pretty good.
    I'm sure one second feels longer in the car!
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  12. #12
    Hybrid booster
    Join Date
    Jan 2007
    Location
    Merrimack, NH
    Posts
    880

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by wheming View Post
    What was the start RPM of your test?
    I think what you've shown here is pretty good.
    I'm sure one second feels longer in the car!
    39.915 seconds since log started, 4475RPM, -3psi (vacuum)
    40.989 seconds since log started, 4973RPM, 24.1psi

  13. #13
    Supporting Member II Turbo Mopar Contributor Shadow's Avatar
    Join Date
    Dec 2006
    Location
    Aubigny, Manitoba, Canada
    Posts
    5,088

    Re: Boost lag test, 24.1psi result in 1.074 second.

    I think this will give you a more accurate depiction of what is going on;

    Boost starts, 0.1psi hits at 1554RPM in third gear.
    5psi hits at 2977RPM in third gear.
    10psi hits at 3629RPM in third gear.
    23.6psi in fourth gear at 3993RPM

    Other than that, you'd have to go for a spin and hold it in third @ 4500rpm and nail it to compare what's being shown here. Remember, any turbo that reaches full spool sooner than the "Go" rpm Should be Instant ON!

    Robert Mclellan
    http://www.youtube.com/watch?v=wambNdfnu5M
    10.04 @ 143.28mph (144.82 highest mph)
    Worlds fastest 8v MTX Shelby Charger
    Manitoba's Fastest 4cyl!
    8 valve, No Nitrous!
    New clutch combo is the SH!T!

  14. #14
    turbo addict
    Join Date
    Dec 2005
    Location
    Pickering, ontario
    Posts
    2,670

    Re: Boost lag test, 24.1psi result in 1.074 second.

    Anyone want to add to Tryingbe's original thread on boost response?

    http://www.turbo-mopar.com/forums/sh...ght=full+boost

Similar Threads

  1. Caravan + Road Trips = 13.0 result on DOTs
    By a89mini in forum Events, Racing, & Results!
    Replies: 4
    Last Post: 08-06-2012, 06:25 PM
  2. Oil out of valve cover oil cap under boost, did a compression test......
    By tehdrizzle in forum Engine - Block, Piston, Heads, Intakes
    Replies: 5
    Last Post: 03-17-2011, 10:39 PM
  3. boost leak test results in air out dipstick
    By J&H Ryan in forum Engine - Block, Piston, Heads, Intakes
    Replies: 37
    Last Post: 08-07-2010, 06:24 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •