Page 1 of 2 1 2 LastLast
Results 1 to 20 of 37
  1. #1
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default Dyno Tuning 2.8TDI

    Guys,

    I'm taking my Colt 2.8TDI tomorrow to SAC Centurion for a Dyno Tune and Oil service.

    My truck smokes a bit, much more than other 2.8's, and I'm hoping that a proper tune-up will solve this to some extend.

    Also my truck's boost seems to come in later than normal. Usually the 2.8TD will start pulling like a train from 1500rpm, mine only starts at 1750 rpm which may not sound like a large difference but it makes a big difference in the flexibility using the engine power especially on long inclines.

    Anybody have any thoughts on this?

    The dyno tune is R1250.

  2. #2
    4ePajero Guest

    Default

    I don't want to rain on your parade, but a pump calibration by a specialist is what you need.

    Ask SAC what the dyno tune involves?

    It is not like a petrol engine where eg the fuel mix and timing can be adjusted whilst on the dyno.

    A diesel like the 4m40 will run well or badly depending on:

    • pump calibration
    • pump timing (which can only go out if the pump was installed incorrectly)
    • injector condition
    • compression
    • correct boost
    • correct exhaust back pressure

    (Did I miss anything?)

    AFAIK, none of these can be corrected on the fly on a dyno.

  3. #3
    Join Date
    Jul 2007
    Location
    Roodepoort
    Age
    53
    Posts
    394
    Thanked: 12

    Default

    Yep like 4ePajero said rather go for the pump callibration
    I did n dyno on my colt at CRD and it looks like they only adjust the boost
    could feel n difference afterwards but after a while it feels like it used to....

    So first go for the callibration then the other stuff......

    BTW my boost kicks in at around 1800rpm
    2005 Isuzu KB300 D/C Auto
    2014 Isuzu Kb300 4x4

  4. #4
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    SAC claim to be Turbo Diesel Specialists whatever that means

    The guy told me this morning that they adjust the diesel pump on their dyno.

    What does pump calibration entail exactly?

  5. #5
    4ePajero Guest

    Default

    Quote Originally Posted by Cobus2.8TDI View Post
    SAC claim to be Turbo Diesel Specialists whatever that means
    Yeah, right!

    Quote Originally Posted by Cobus2.8TDI View Post
    The guy told me this morning that they adjust the diesel pump on their dyno.
    They can only adjust the overall richness of the mixture whilst the pump is on the engine. The output to the individual cylinders cannot be adjusted whilst the pump is on the engine.

    Quote Originally Posted by Cobus2.8TDI View Post
    What does pump calibration entail exactly?
    The pump is put on a test bench and the four delivery pipes are tested to

    • pump the correct volume per stroke
    • all pump the same volume per stroke

    This cannot be done whilst the pump is on an engine.

  6. #6
    Join Date
    Jan 2008
    Location
    More or less Cullinan
    Age
    54
    Posts
    1,180
    Thanked: 8

    Default

    For proper off-vehicle pump calibration talk to Sergio at D+F Diesel in Voortrekkers weg 012 329 3611
    Or Linda or Bryan at Wildaf Diesel in PTA West 012 379 6980/8
    Jacques
    Never trust a Chinchilla to hold your balloon.

  7. #7
    Join Date
    Sep 2006
    Location
    Pretoria
    Age
    69
    Posts
    2,339
    Thanked: 705

    Default

    I hope your experience with SAC Centurion is better than mine. When I took my Colt there over 2 years ago I had to pay over R6000 which included a new EGT Gauge. They could not get the EGT low enough and first replaced injectors and then phoned for permission to fit a freeflow. Did not help much so they detuned a bit handling me the vehicle back with less power than before. After that had to spend R300 to move the poorly fitted exhaust to allow full rear axle articulation. PTA Diesel Centre in Potgieterstreet is far better, SAC will not see me again.

  8. #8
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    Quote Originally Posted by 4ePajero View Post

    The pump is put on a test bench and the four delivery pipes are tested to

    • pump the correct volume per stroke
    • all pump the same volume per stroke
    This cannot be done whilst the pump is on an engine.
    Now its starting to make sense.

    Live and learn I guess.

    Next obivious question:

    How easily does a pump loose its calibration?

  9. #9
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    Quote Originally Posted by Dookie View Post
    For proper off-vehicle pump calibration talk to Sergio at D+F Diesel in Voortrekkers weg 012 329 3611
    Or Linda or Bryan at Wildaf Diesel in PTA West 012 379 6980/8
    Thanks for the contact info!

  10. #10
    Join Date
    Sep 2006
    Location
    Centurion
    Age
    53
    Posts
    2,577
    Thanked: 857

    Default

    SAC is not good in my experience (And I am putting this as mildly as possible)

    They will not sort out your smoking and low power on the 2.8 Colt engin and will probably also not get the EGTs right either.

    Rather take it to Pta Diesel Center in Pretoria. They know these engines like the back of their hands and did EXCELENT work on my then smoking and gutless Colt when I drove one. By the way they do not 'tune' they set the engine and pump to the correct specified factory settings, as this is where they deliver the best results and the best engine life.

    CATs
    2015 VW Transporter T5.1 132kw 4motion DSG - (Shrek) My Bush-Bus
    2003 Safari Xplorer
    Previous : 1996 Colt Rodeo 3000 V6 (The Original! - SOLD) : 1998 Colt Rodeo 2.8Tdi (My first Diesel - SOLD) : 2008 Pajero 3.2 DiDc GLS (Sylvester - SOLD) : 2001 LR Defender 90 (Grizzly - Sadly SOLD) : 2010 LR Discovery 4 HSE (Snow White - SOLD) : 2001 Pajero 3.2 DiD GLS (Snoopy - SOLD but never forgotten) :2009 Pajero 3.2 DiDc GLS (Casper ,Old Faithfull, - SOLD)

  11. #11
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    Quote Originally Posted by PierredW View Post
    I hope your experience with SAC Centurion is better than mine. When I took my Colt there over 2 years ago I had to pay over R6000 which included a new EGT Gauge. They could not get the EGT low enough and first replaced injectors and then phoned for permission to fit a freeflow. Did not help much so they detuned a bit handling me the vehicle back with less power than before. After that had to spend R300 to move the poorly fitted exhaust to allow full rear axle articulation. PTA Diesel Centre in Potgieterstreet is far better, SAC will not see me again.

  12. #12
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    Quote Originally Posted by Cats View Post
    SAC is not good in my experience (And I am putting this as mildly as possible)

    They will not sort out your smoking and low power on the 2.8 Colt engin and will probably also not get the EGTs right either.

    Rather take it to Pta Diesel Center in Pretoria. They know these engines like the back of their hands and did EXCELENT work on my then smoking and gutless Colt when I drove one. By the way they do not 'tune' they set the engine and pump to the correct specified factory settings, as this is where they deliver the best results and the best engine life.

    CATs
    Can't we create some sort of list on the forum of places where not to take you vehicle?

    Perhaps we can give it an average member experience rating.

    What will a proper pump calibration cost round about?

  13. #13
    Join Date
    Sep 2006
    Location
    Centurion
    Age
    53
    Posts
    2,577
    Thanked: 857

    Default

    Quote Originally Posted by Cobus2.8TDI View Post
    What will a proper pump calibration cost round about?
    I would guess about R2000-R3000? My last one was about 4 years ago and then it was in the region of R1600 IIRC. This included calibration and dyno settings as well checking injector spray patterns.

    CATs
    2015 VW Transporter T5.1 132kw 4motion DSG - (Shrek) My Bush-Bus
    2003 Safari Xplorer
    Previous : 1996 Colt Rodeo 3000 V6 (The Original! - SOLD) : 1998 Colt Rodeo 2.8Tdi (My first Diesel - SOLD) : 2008 Pajero 3.2 DiDc GLS (Sylvester - SOLD) : 2001 LR Defender 90 (Grizzly - Sadly SOLD) : 2010 LR Discovery 4 HSE (Snow White - SOLD) : 2001 Pajero 3.2 DiD GLS (Snoopy - SOLD but never forgotten) :2009 Pajero 3.2 DiDc GLS (Casper ,Old Faithfull, - SOLD)

  14. #14
    Join Date
    Jul 2008
    Location
    Pretoorsdorp (Centurion)
    Age
    51
    Posts
    3,915
    Thanked: 185

    Default

    One need to be carefull of this, there could be other issues that need to be checked before, otherwise they wil just reset your Fuel pump and maybe not attending to the real problem causing the smoke and the low power, such as injectors, EGR vale.. and so on.
    I used a guy in Centurion that I was extremely impressed with the work he has done on my vehicle, I can really recommend him. Maruis at Diesel/Petrol Auto 012-6537235

  15. #15
    Join Date
    Jan 2008
    Location
    More or less Cullinan
    Age
    54
    Posts
    1,180
    Thanked: 8

    Default

    The guys at D+f,Wildaf, PTA Diesel al have diagnostic equipment.
    Instead of just doing something because it seems like the thing to do, rather have them diagnose the vehicle properly.
    Like mentioned, it might not even be the pump.........
    Jacques
    Never trust a Chinchilla to hold your balloon.

  16. #16
    4ePajero Guest

    Default

    Quote Originally Posted by Navigator View Post
    One need to be carefull of this, there could be other issues that need to be checked before, otherwise they will just reset your Fuel pump and maybe not attending to the real problem causing the smoke and the low power, such as injectors, EGR valve.. and so on.
    I agree that one should not overlook other items, but one starts with a pump calibration. That is not negotiable.

    After the pump calibration, you can check and repair/adjust all other items.

  17. #17
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    Ok. I got my truck back form SAC

    Dyno results:
    71.8kw @ 3364rpm
    251NM @ 2456rpm.

    That looks pretty much dead on for what the factory claims are.

    Here is problem,

    They suspect that my turbo may have a leaking wastegate! The boost at 1800rpm is apparently way below spec, 2.5lb's instead of 6lb's. I've got the power and troque graph...but no reference of how it is supposed to look!

    They are qouting R18k for a new turbo and injectors! I reckon this can be done for much less somewhere else!

    Anyone got a scan of a dyno done on a 2.8TD with a healthy turbo?
    How can I tell if the wastegate is indeed leaking?

  18. #18
    Join Date
    Jul 2008
    Location
    Pretoorsdorp (Centurion)
    Age
    51
    Posts
    3,915
    Thanked: 185

    Default

    I recon they are smoking you or just really expensive What is the km on you vehicle? The boost pressure is controlled by the waist gate, if your waist gate got a leak it will take longer to spool and achieve full boost at low rpm. Ive seeing some Colts with this issue, with relative high km on the clock.
    You should not pay more than R13000 for a Turbo, injectors and a dyno.

    I`ll a second opinion if I were you....

    Cobus Böhmer
    071-6417947
    [email protected]

  19. #19
    Join Date
    Jul 2007
    Location
    Centurion
    Age
    44
    Posts
    2,064
    Thanked: 427

    Default

    Quote Originally Posted by Navigator View Post
    I recon they are smoking you or just really expensive What is the km on you vehicle? The boost pressure is controlled by the waist gate, if your waist gate got a leak it will take longer to spool and achieve full boost at low rpm. Ive seeing some Colts with this issue, with relative high km on the clock.
    You should not pay more than R13000 for a Turbo, injectors and a dyno.

    I`ll a second opinion if I were you....
    Agreed that qoute seems extremely high! I've got an estimate for R3.5k to recondition the wastegate if that is indeed the problem, is this a feasible alternative?

    My truck now stands on 158 000 km.

    What are the implications of driving the truck like this appart from the lack of power at low rpm?

  20. #20
    Join Date
    Jul 2008
    Location
    Pretoorsdorp (Centurion)
    Age
    51
    Posts
    3,915
    Thanked: 185

    Default

    There are no real serious implications of driving the vehicle like that, will have less low down power, might also be a bit smoking at low rpms... This condition will worsen as time go on as the damaged area on the wast gate will just burn more.
    Thats for the waist gate, but if the injectors are really bad, that could be fairly serious, high fuel consump, over fuellling.... and so on!
    I know there is people that only change the rear housing on the turbo, which include the waist gate, but not sure who and where to go for that. Normally the workshops like Steves tend to rather replace complete unit.

    Cobus Böhmer
    071-6417947
    [email protected]

Page 1 of 2 1 2 LastLast

Similar Threads

  1. Dyno tuning
    By Pahero in forum General 4x4 Discussion
    Replies: 5
    Last Post: 2011/07/26, 08:38 AM
  2. What price for Dyno Run??
    By Gert du Preez in forum General 4x4 Discussion
    Replies: 2
    Last Post: 2011/05/03, 05:16 PM
  3. Dyno Tuning 4.5 Carburator cruiser/Exhaust system
    By willie moutom in forum Toyota
    Replies: 2
    Last Post: 2011/04/03, 12:27 PM
  4. Dyno Tuning
    By Pierre in forum Land Rover
    Replies: 5
    Last Post: 2007/07/28, 11:25 AM

Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
  •