3b altitude adjustment

[wesintl]

Do you guys have any tips for altitude adjustment. Like what timing you found to work best. I'm at about 5800 in denver and would like to go up to 10+. Right now she is blowing black smoke pretty good on heavy throttle. I'm thinking I need to advance the timing a tad and lower the fuel. Any tips before I start tinkering with it and completely mess it up
I realize I need a turbo but I think im going to splurge on a suspension first... these flat springs ala low rider are not great for wheeling if you know what I mean

-W

 

[The Dude]

install an EGT and adjust fuel accordingly from there.

I don't mind a little black smoke. It's the blue stuff I don't like....

 

[cruiser_guy]

I'd like a little info on altitude adjustment as well. We just pulled into Guatemala City yesterday and crossed the highest point of the Interamericana Highway at over 3600 meters (approx. 12,000 feet!!). My pyrometer would easily climb to 1300 - 1350F preturbo if I wasn't watching carefully. It would climb to 1200F at home if I pushed it HARD. I'm turbo'd but not intercooler'd. I could blow out black easily if I pushed it much (then I fit in with everyone else down here).

I will say that the turbo makes a HUGE difference. Two years ago in Mexico City (before I had the turbo) I did not have the power I had yesterday and that is 4000 feet lower!

 

[HZJ60 Guy]

The best altitude adjustment is a TURBO!

HA!


TB

 

[cruiser_guy]

I AM turbo'd with an AXT kit running approximately 8-9 lbs but at 12,000 feet there just is not much air. I'm concerned that I'll end up smoking the engine if I don't keep a constant eye on the pyrometer. 1300 - 1350 F pre-turbo is just more than I'm comfortable with. Like I said, back in Vancouver, Canada I'd have to work it HARD to make it get to 1200 F.

 

[HZJ60 Guy]

I AM turbo'd with an AXT kit running approximately 8-9 lbs but at 12,000 feet there just is not much air. I'm concerned that I'll end up smoking the engine if I don't keep a constant eye on the pyrometer. 1300 - 1350 F pre-turbo is just more than I'm comfortable with. Like I said, back in Vancouver, Canada I'd have to work it HARD to make it get to 1200 F.

12000 ft? You da man.

How about intercooling the CRAP out of it?

That or propane does a good job of lowering EGT temps.


TB

 

[Greg_B]

Hey cruiser_guy

I think I am grateful I did not have a pyro on my naturally aspirated BJ42 when heading up Bear Tooth Pass on the way to South Dakota a few years back. I drove to the black smoke, which turned blue at elevation, and the truck was literally coughing at the top (10,900' if I recall right).

Drive to the pyro, turn the fuel down while you are there(if that is an option), or intercooler seems like it...

Or...........






Two Turbos

gb

 

[kodiak]

AXT Running hot

Charles.
Your fuel pump is running too rich. At any altitude a high reading at the pyro can be cured by leaning out the overall injection volume. Increase your boost to at least 10. If you need to take your foot out of the throttle to cool exhaust, you are Im sure aware cutting air to the engine which in turn is allowing boost to fall, and more heat to build up. More fuel, more heat, more power, more smoke. Less fuel, less heat, less power, less smoke. If you continue to have trouble with this let me know, (or if you are unfamiliar with the injection volume adjustment) Your peak HP will decrease with this adjustment but you will not overheat the top end. Incidentally I ran my AXT BJ 60 spiking into the 1300-1400 range after the turbo. That motor is tired (just under 600,000Km) but has never failed. AXT recommends CONTINUOUS max of 1150 immediately after turbo. Please contact me directly at kodiakcustom@shaw.ca if you have any further questions/problems. I have not been on this site before and although I like it, I don't get much time to spend doing this.
Cory