High EGT on my AAZ - page 1 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• High EGT on my AAZ by orbitald on 19 Jun, 2008 17:03
• Questions,
  
  I have an AAZ in my Vanagon Syncro:
  
  - K03 turbo
  - 2.5" exhaust
  - GTD nozzles
  - SAAB blackstone intercooler with 800cfm fan
  - EGT sensor pre-turbo
  - Boost at about 11psi
  - I'm running 235/70/16 with stock gearing
  
  I'm trying to find the right balance of power and low EGTs.
  
  I've rotated the boost pin 1/2 turn and the van has plenty of power now but my EGT temps are climbing over 1250 on longer hills. Will increasing my boost also increase my EGT?
  
  What does rotating the star wheel do?
  
  How do I lower my EGT and keep the power?
  
  Thanks,
  
  D
  
  http://picasaweb.google.com/Orbitald/DieselVanagonStuff/photo#5194145059298034050
• #1 by burn_your_money on 19 Jun, 2008 17:14
• High EGTs are unburnt fuel. More boost (or a colder charge) lowers EGTs. Reducing backpressure also lowers EGTs. Bad injectors, worn pump, bad timing are also causes of high EGTs
• #2 by jtanguay on 19 Jun, 2008 17:20
• you think 1250F is hot??? thats normal... when you hit 1400F come back  :lol:
• #3 by orbitald on 19 Jun, 2008 18:00
• Thanks Burn - so increasing my boost slightly might actually bring my EGT down a bit which would be nice. My motor only has about 3K miles on it so I don't think its excessively worn but I should check the timing.
  
  I'm guessing it best to check the timing after boost / fuel pin adjustments are made?
  
  jtanguay - since my motor is kinda new I'm trying to stay in a comfort zone; keeping EGTs and boost as low as possible and still make it over the hill doing 55mph which is somewhat of a balancing act with a Syncro Vanagon with big wheels / tires. I think it would actually go up to 1400F but I back off the petal and shift down to 3rd to keep it around 1250F cresting a big hill at around 50mph.
  
  I could also go with a liquid cooled intercooler but thats another bag of money I still waiting to drop from the sky.
  
  Any insight on what the rotating the star wheel does?
  
  D
• #4 by jimfoo on 19 Jun, 2008 18:06
• The starwheel decreases fuel with boost if it is screwed up, and increases it if screwed down.
• #5 by orbitald on 19 Jun, 2008 18:12
• Thanks Jimfoo,
  
  Is there a procedure for setting all the variables so that maximum burn is achieved?
• #6 by jimfoo on 19 Jun, 2008 18:35
• Yeah, trial and error unfortunately.
• #7 by vanagonturbo on 19 Jun, 2008 20:26
• double your boost.
  
  Here is my setup:
  
  Syncro
  
  225/70/16
  
  final drive ratio 4.86
  
  third gear 1.14
  
  4th gear .77
  
  New AAZ
  
  Non intercooled (for now)
  
  2.5" exh
  
  K03 turbo
  
  fuel screw turned in about two turns
  
  star wheel screwed almost all the way down
  
  1.6td boost pin rotated in the direction of funtime power
  
  vehicle wieght is 5200lbs unladen
  
  I can easily hit 1300 on the freeway during acceleration. I usually keep it around 10-1200. I am at sea level. Mountain pass at a 5% grade will put me in 3rd gear @ 42 MPH. anything more than that will make the EGTs climb.
  
  HTH. Ill be watching this thread
• #8 by orbitald on 01 Jul, 2008 13:39
• Well I was able to raise the boost to around 13psi and I can keep my EGT readings around 1300F now. On the longer hills I back off a bit and shift down to 3rd because it will probably rise up to 1400F if I dont. Raising the boost definitely lowered my EGTs!
  
  I'm thinking maybe 14psi would be OK? I want a long lasting motor and hear conflicting reports on boost. Some say 20psi is fine while my mechanics say stick with 7-9psi.
  
  Also, I have a Saab intercooler with a fan and I'm thinking about a liquid-air intercooler. Any recommendations for a Vanagon?
  
  Thanks for your help.
  
  David
• #9 by saurkraut on 01 Jul, 2008 13:54
• I've been running 20+ psi for a few years now.  Go for 20+ psi
• #10 by zukgod1 on 01 Jul, 2008 14:15
• Quote from: "saurkraut"

  I've been running 20+ psi for a few years now.  Go for 20+ psi

  
  
  
  X2
  
  Turn it up.
• #11 by andy2 on 02 Jul, 2008 15:03
• I would'nt run the k03/t2 past 15-17 psi as they are not bullet proof running 10 psi on stock engines.You can run the k14 with its bigger shaft at 18 psi forever and it will handle it.The k24/T3 can hold 21-22 psi all day long however they have much more lag than the k14.The k14 is the best turbo for a slightly modded 1.6 or 1.9 even my MK4 TDI will be getting a k14 to make 18 psi.
• #12 by anto on 03 Jul, 2008 00:22
• Just to note peugeot supplied the younger 1.9 turbo diesel engines in the 306 model with a kkk k03 turbo and it was set standard to 14psi with a top mount intercooler so id say its safe enough to run at 14 or even higher.
• #13 by orbitald on 30 Dec, 2008 11:07
• Another question about this.
  
  If I want to lower my egt going up large long hills on the highway (mountain driving) and I have three choices:
  
  1) reduce fuel with max fuel screw
  2) turn boost pin back around slightly
  3) back star wheel up a little
  
  Which should I choose and why?
  
  Thanks,
  
  David
• #14 by blackdogvan on 30 Dec, 2008 11:23
• You might want to read a bit about water/methanol injection. There are a few threads here & lots on info on the internets. For those once in a while long hills it would be nice to have. Your rear washer tank is already full of an almost perfect injection blend.
  
  Real nice looking van BTW!