High altitude Brat?

[milkman111083]

I was looking under the hood of my 85 brat to see if i could find out if it was from california. I believe the california version came with an egr valve and some other modifications to help with smog. I did not find a california model but i did find a disclaimer explaining that the car was designed for high altitude. I assume that means there are some carburator modifications. What are the differences for the high altitude models? Should i change them back since i live basically at sea level in san diego?

[opus]

In my mind, that would mean you are running lean at sea level. Higher up you go, thinner the air, need to run fatter.

[zyewdall]

Probably different sized jets?

[bheinen74]

what is your documentation that shows its a high altitude model?

pics of the disclaimer sticker?

i am interested, because my 85 is a cali brat too, and the hitachi is poor performing, time to weber mine.

[Gloyale]

I was looking under the hood of my 85 brat to see if i could find out if it was from california. I believe the california version came with an egr valve and some other modifications to help with smog. I did not find a california model but i did find a disclaimer explaining that the car was designed for high altitude. I assume that means there are some carburator modifications. What are the differences for the high altitude models? Should i change them back since i live basically at sea level in san diego?

 

They all had EGR valves.

 

If it doesn't have an ECU, it isn't a California car. All california cars used the ECU and *feedback* carb to compensate for alltitude. Cali car wouldn't have the High altitude modification sticker. The *feedback* carbs use duty solenoids to regulate mixture so no extra *high altitude* stuff would be needed.

 

 

The high altitude cars were all 49 st. models, and had a pressure sensative chamber that let through a variable amount of air into the primary air bleed to adjust mixture. It is mearly *Tee-d* into the main and slow bleed lines, and lets a small amount of extra air in at high altitude. 2 vac lines and on small chamber/valve, mounted to the fenderwell.

 

Otherwise the carbs and whole systems are the same, High altitude or not. No difference in Jet size between H/A or non.

Edited April 24, 2009 by Gloyale

[zyewdall]

There's alot of us guessing... and some who actually know like Gloyale

 

I've taken my old '82 wagon up to aboug 12,500 feet, and it did okay (well... even more complete lack of power than usual..., but still ran fine, and made it over the pass).

 

Z