Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: what are SAFE EGTs

  1. 18th August 2013, 09:27 PM #1
    Michael2's Avatar
    Michael2
    Michael2 is offline ChatterBox Supporter
    Join Date
    Jan 1970
    Location
    Melbourne
    Posts
    2,972
    Total Downloaded
    0

    what are SAFE EGTs

    Hi Guys,

    Sorry if it's been done already, but I couldn't find anything on the search.

    I've fitted an EGT gauge to the 300Tdi with a view to tuning it.

    I haven't done any tuning yet, and it's not blowing any (overfuelling) smoke.

    I'd like to know what a safe EGT is.
    Around town it sits around 300.C
    Flat to slight up hill on the highway @ 100kph in 5th gear is 500.C
    Flat to slight up hill on the highway @ 100kph in 5th gear OVERDRIVE is 550.C

    Holding it in 6th (Overdrive 5th) for a climb gets it to around 600.C

    I'm supposing that this (heat) stress corresponds to gearbox stress as well as engine stress, though I don't have a transmission temp gauge (yet).

    I'm contemplating a larger intercooler which should help with EGTs, however I'd like to know the consensus on the safe higher end temps (both constant operation and transient peak).

    Thanks in advance, Michael.
    Reply With Quote Reply With Quote
  2. 19th August 2013, 01:16 AM #2
    33chinacars
    33chinacars is offline Wizard Subscriber
    Join Date
    Dec 2009
    Location
    Tyrendarra Vic (South West Vic )
    Posts
    1,729
    Total Downloaded
    0
    Some good info here & no I'm not connected.

    ThermoGuard Instruments

    Gary
    Reply With Quote Reply With Quote
  3. 19th August 2013, 04:33 AM #3
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,499
    Total Downloaded
    0
    http://www.aulro.com/afvb/technical-...ml#post1521229

    650 is max safe
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
    Reply With Quote Reply With Quote
  4. 19th August 2013, 07:18 AM #4
    Michael2's Avatar
    Michael2
    Michael2 is offline ChatterBox Supporter
    Join Date
    Jan 1970
    Location
    Melbourne
    Posts
    2,972
    Total Downloaded
    0
    Thanks Dave. The thread was on TD5 EGTs. Do the same figures apply to the 300Tdi? The pyrometer probe is in the EGR blanking plate on the manifold.

    Thanks.
    Reply With Quote Reply With Quote
  5. 19th August 2013, 07:54 AM #5
    Dougal
    Dougal is offline ForumSage
    Join Date
    Sep 2007
    Location
    Kiwiland
    Posts
    7,246
    Total Downloaded
    0
    Quote Originally Posted by Blknight.aus View Post
    650 is max safe
    Don't tell my Isuzu that.

    Quote Originally Posted by Michael2 View Post
    Thanks Dave. The thread was on TD5 EGTs. Do the same figures apply to the 300Tdi? The pyrometer probe is in the EGR blanking plate on the manifold.

    Thanks.
    I wonder if your probe is long enough to reach the centre of the flow, because those temps do seem a bit cold.

    How high is safe depends on how robust your engine is.
    With a solid engine 750C is the max you ever way to see.
    650C is a sensible limit for sustained high load.

    My Isuzu has seen 900C accidentally a few times.
    Reply With Quote Reply With Quote
  6. 19th August 2013, 08:13 AM #6
    Michael2's Avatar
    Michael2
    Michael2 is offline ChatterBox Supporter
    Join Date
    Jan 1970
    Location
    Melbourne
    Posts
    2,972
    Total Downloaded
    0
    Thanks.

    It's a fairly long probe, but even if the exact temp is a bit out, the gauge is still a good indicator of trends.

    The highest I got too on my last trip (Melb - Cape York + touring 11,000km) was about 620.C and only transiently. Most constant (6th gear) driving was at 550 - 580.C, so I suppose I have room to safely tune, especially if I upgrade the intercooler.
    Reply With Quote Reply With Quote
  7. 19th August 2013, 08:16 AM #7
    rick130's Avatar
    rick130
    rick130 is offline Moderator Gold Subscriber
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    17,285
    Total Downloaded
    0
    Quote Originally Posted by Dougal View Post
    Don't tell my Isuzu that.



    I wonder if your probe is long enough to reach the centre of the flow, because those temps do seem a bit cold.

    How high is safe depends on how robust your engine is.
    With a solid engine 750C is the max you ever way to see.
    650C is a sensible limit for sustained high load.

    My Isuzu has seen 900C accidentally a few times.

    This.

    My Tdi has been living with 720*C temps on climbs for years, and occasionally seen 750* (not by choice, by not observing )
    It's still on the original head gasket @ 308,000km (but about to be changed as a precaution)

    Stock used to get to 623*, so 650* is nothing.

    A decent exhaust (my 3" pipe dropped EGT's by about 25K) and a decent I/C can help drop the temps, as does correct timing and a decent/more efficient turbo.

    Also don't forget there's a relationship between EGT's, timing, combustion temps and combustion pressures and it isn't straight forward.

    Have a read here and click the links too http://www.aulro.com/afvb/1946217-post5.html
    Reply With Quote Reply With Quote
  8. 19th August 2013, 08:29 AM #8
    Dougal
    Dougal is offline ForumSage
    Join Date
    Sep 2007
    Location
    Kiwiland
    Posts
    7,246
    Total Downloaded
    0
    What's this "6th gear" nonsense?

    Do you have something else to tell us?
    Reply With Quote Reply With Quote
  9. 19th August 2013, 01:01 PM #9
    Michael2's Avatar
    Michael2
    Michael2 is offline ChatterBox Supporter
    Join Date
    Jan 1970
    Location
    Melbourne
    Posts
    2,972
    Total Downloaded
    0
    Quote Originally Posted by Dougal View Post
    What's this "6th gear" nonsense?

    Do you have something else to tell us?
    6th gear refferes to Roverdrive (Global Roamer Overdrive 28%) engaged in 5th.

    It drops RPM @ 100kph to 2,000 - I haven't seen any change in economy, but the change in volume is so nice.
    Reply With Quote Reply With Quote
  10. 19th August 2013, 08:02 PM #10
    Sitec's Avatar
    Sitec
    Sitec is offline YarnMaster Subscriber
    Join Date
    Dec 2009
    Location
    Williamstown, Barossa, SA
    Posts
    3,451
    Total Downloaded
    0
    Most truckies live by the 600deg figure. Safe then!
    Reply With Quote Reply With Quote
Page 1 of 2 12 LastLast
« Glowshift gauges | TD5 rocker cover gaskets »

Bookmarks

Bookmarks

Posting Permissions

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

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!