Author Topic: High EGT on my AAZ (Read 14193 times)

orbitald · « **on:** June 19, 2008, 05:03:54 pm »

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

burn_your_money · « **Reply #1 on:** June 19, 2008, 05:14:54 pm »

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

jtanguay · « **Reply #2 on:** June 19, 2008, 05:20:50 pm »

you think 1250F is hot??? thats normal... when you hit 1400F come back :lol:

orbitald · « **Reply #3 on:** June 19, 2008, 06:00:43 pm »

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

jimfoo · « **Reply #4 on:** June 19, 2008, 06:06:23 pm »

The starwheel decreases fuel with boost if it is screwed up, and increases it if screwed down.

orbitald · « **Reply #5 on:** June 19, 2008, 06:12:21 pm »

Thanks Jimfoo,

Is there a procedure for setting all the variables so that maximum burn is achieved?

jimfoo · « **Reply #6 on:** June 19, 2008, 06:35:26 pm »

Yeah, trial and error unfortunately.

vanagonturbo · « **Reply #7 on:** June 19, 2008, 08:26:23 pm »

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

orbitald · « **Reply #8 on:** July 01, 2008, 01:39:17 pm »

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

saurkraut · « **Reply #9 on:** July 01, 2008, 01:54:48 pm »

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

zukgod1 · « **Reply #10 on:** July 01, 2008, 02:15:57 pm »

Quote from: "saurkraut"

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

X2

Turn it up.

andy2 · « **Reply #11 on:** July 02, 2008, 03:03:02 pm »

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.

anto · « **Reply #12 on:** July 03, 2008, 12:22:23 am »

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.

orbitald · « **Reply #13 on:** December 30, 2008, 11:07:21 am »

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

blackdogvan · « **Reply #14 on:** December 30, 2008, 11:23:26 am »

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!

Author Topic: High EGT on my AAZ (Read 14193 times)

andy2

anto