Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 25
  1. #1
    oikonomoupetros's Avatar
    Join Date
    Mar 2012
    Location
    Thessaloniki, Greece
    Posts
    399
    +1
    50

    Afr and egt installed..but what should they read?

    So, just installed these 2 gauges.
    I ll go for a test tomorrow, i just flashed my ecu back to stock.
    I ll do a run and then i ll test the vtech tunes.
    - 8350 169 36 39 AGR
    - 8350 170 35 34 AGR

    Since i installed riva retainers and springs i might as well test the 8500 tunes as well...although these might be better off tested upon arrival of my datalogger and 1100 injectors.

    So far at idle (out of the water) the EGT reads up to 6....is this normal? Maybe its because of the high idle rpms at start up...?
    Afr reads 13.2 at this idle state.

    Click image for larger version. 

Name:	ImageUploadedByTapatalk1431013966.876787.jpg 
Views:	72 
Size:	257.0 KB 
ID:	358111Click image for larger version. 

Name:	ImageUploadedByTapatalk1431013985.726605.jpg 
Views:	71 
Size:	215.2 KB 
ID:	358112


  2. #2
    JT jpt7779's Avatar
    Join Date
    Jul 2008
    Location
    Pittsburg, Texas Lake Bob Sandlin
    Posts
    3,851
    +1
    742
    EGTs idle 670*C or 1240*F
    9000 rpm WOT 900*C or 1650*F

    WHere is your thermocoupler(s) located? 3 installed?

  3. #3
    Ken62465's Avatar
    Join Date
    Apr 2011
    Location
    Gardner, MA
    Posts
    582
    +1
    48
    I'm in this exact same boat...CMD installed last year and added EGT probes over this past winter in each manifold flange that bolts to head...closest you can get it. The 1650°F...that really a safe number? I researched this subject a while back and seemed target numbers most liked were 1500-1550. Not trying to hijack the op's thread just question the 1650 temp....not doubting you on that either. 100-150 is a good difference.

    Quote Originally Posted by jpt7779 View Post
    EGTs idle 670*C or 1240*F
    9000 rpm WOT 900*C or 1650*F

    WHere is your thermocoupler(s) located? 3 installed?

  4. #4
    JT jpt7779's Avatar
    Join Date
    Jul 2008
    Location
    Pittsburg, Texas Lake Bob Sandlin
    Posts
    3,851
    +1
    742
    I was told by two different engine builders that know these engines inside and out and they suggested keeping the WOT temps below 1700*F or 926*C. I have seen higher than that a few times on a long hard run.

    Around 8650-8700 rpm I see 1550*F +-.

  5. #5
    oikonomoupetros's Avatar
    Join Date
    Mar 2012
    Location
    Thessaloniki, Greece
    Posts
    399
    +1
    50
    One more critical question!
    Once my DataLogger arrives, how am i supposed to connect my existing wideband sensor to the logger? Meaning i have already connected it to this AFR gauge.

  6. #6
    oikonomoupetros's Avatar
    Join Date
    Mar 2012
    Location
    Thessaloniki, Greece
    Posts
    399
    +1
    50

    Afr and egt installed..but what should they read?

    Test results live from the Med!
    Stock tune at full throttle and 7860rpms : egt goes all the way up to 970c!
    Afr is 13:3-14.2. At closed throttle goes down to 12.4

    Using tune 48 8375 170 35 34 AGR
    - went up to 8100rpms
    - EGT at idle is 560c. At full throttle goes up to 920c-930c
    - AFR is at idle 12.8-12.9
    - at 5000rpm 13..4
    - at 6000rpm 13.3
    - at full throttle it will be at 12.7
    Sometimes over 6000 i saw around 14.2

    At closing the throttle from full iit would read 11.8..

    At both tunes i ve lost around 200-220 rpm. Probably because i installed the RIVA springs and retainers i guess
    Last edited by oikonomoupetros; 05-08-2015 at 08:52 AM.

  7. #7
    oikonomoupetros's Avatar
    Join Date
    Mar 2012
    Location
    Thessaloniki, Greece
    Posts
    399
    +1
    50
    And last tune used:
    48 8375 169 39 36 AGR
    I don't have to tell u of course that this tune is awesome in initial bite and acceleration compared to the others...BUT
    - EGT would hit 980c very easily on full throttle.
    - AFR at full throttle would be at 13.5-13.6
    At 6000 it was 14.2!
    At idle it was 13.2.
    Releasing from full throttle it would go 12.1-11.8

    So i just returned to the less agressive tune ..with 35 34 timing and more gasoline at 170.
    Do u believe that my oem 48 injectors are to blame for these lean values? As far as i know best ones would be around 11.9-12.2 and not 13.6-14.3!!!
    Also what are the reasons that i have such 900+c reading by the EGT? I have one probe installed , next to the wideband sensors installation.
    Could it be a sensor is faulty? Although they are brand new and first time used (not chinese ones of course!).
    Gauges are by AEM.
    I am waiting for my VT 1100 injectors and datalogger to arrive as to further evaluate what is the matter....any help is greatly appreciated guys.

  8. #8
    JT jpt7779's Avatar
    Join Date
    Jul 2008
    Location
    Pittsburg, Texas Lake Bob Sandlin
    Posts
    3,851
    +1
    742
    Nothing to evaluate any further, you are extremely too lean and risk burning up a piston, due to stock injectors are definitely maxed out duty cycle. In addition, 36-39* timing is way too advanced and just like others running these tunes you are on the verge of destroying your engine.
    You are out of your mind to continue running your engine like this! You may have already damaged the pistons and or cylinders. STOP.
    Wait for the VT1100 injectors and run a very conservative tune until you get this dialed in with a data logger.


  9. #9
    oikonomoupetros's Avatar
    Join Date
    Mar 2012
    Location
    Thessaloniki, Greece
    Posts
    399
    +1
    50
    I immediately tuned it back to the 35 34 timing tune, which showed the best afr and egt values even better than the stock tune!
    Should i be looking also at a fuel pressure regulator? Or even a new gas pump? Or should i wait for the injectors and then re evaluate?
    Conditions were 26celcious, calm sea at beginning but rough in the end.

  10. #10
    Sharkdiver1125's Avatar
    Join Date
    Apr 2015
    Location
    Chesapeake bay MD
    Posts
    159
    +1
    23
    are you using a rising rate regulator

Page 1 of 3 1 2 3 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 2012 RXT-X grounded and overheated - what should I check?
    By Incorrigible in forum 4-Tec Performance
    Replies: 4
    Last Post: 09-02-2012, 09:28 AM
  2. First time on in 5 Years, toughs and what should I look for
    By Yanksfan in forum Yamaha PWC Performance (2-stroke)
    Replies: 7
    Last Post: 04-17-2012, 08:33 PM
  3. 2004 RXP - What should I do and in what order?
    By geowelsh in forum 4-Tec Performance
    Replies: 8
    Last Post: 04-17-2011, 04:16 PM
  4. Venturi siphon tubes? What are they for and do you really need them?
    By Chaumontrxp-x in forum 4-Tec Performance
    Replies: 14
    Last Post: 09-30-2010, 09:09 PM
  5. Have some damage to my intake grate and impeller. What should I do?
    By superjetpilot in forum Honda Open Discussion
    Replies: 2
    Last Post: 07-22-2009, 06:10 PM

Posting Permissions

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