Can anybody answer the qustion: Do I need to tune AEM EMS for altitude (already tuned for sea level). \

Also, I have been told that I will destroy my engine by running pump gas when tuned for race gas...what do people do when they go cross country in their race tuned evos? I know that I will get knock and lower performance but does knock and detonation really kill the engine or just if driven really hard?

 

You need to have more than one map. I have a 100 octane map and a c16 map. Most guys also have a 91/93 octane map.

 

That is what I thought, makes sense to me...so I will need a MAP for altitude too I guess?

 

i would have a generic map that is reasonably safe at all altitudes and weather extremes on 91 octane. this way, you can always load the map and drive safely. you won't get much horsepower or torque out of it though. better safe than sorry in my book.

i would also have a highly tuned map for my altitude and preferred gas. if tuned too tightly, you will have to have it retuned every spring and autumn to be safe, but you will get the most amount of horsepower and torque possible.

the simple answer to your question is yes, you will need to have your tune take your altitude into account.

strike

 

Are you going to keep the stock MAF or switch to speed density using a MAP sensor?

 

The car is currently on speed density. That's what the previous owner had it on. I really do not know what that means yet.

 

Since you have converted to speed density, theoretically you won't need to have it re-tuned for altitude changes. Large discussion on the AEM Power forum about this a few months back, www.aempower.com. IMO, if you need it re-tuned it will be more along the lines for different fuel octanes than altitude changes, as you have a MAP sensor (manifold absolute pressure) and no longer metering air flow with the MAF sensor.