[leftcoastman]

Alrighty, I went out with the stock map and got the following results from a 3rd gear rollon:

Peak: 10psi
Midrange: 6PSI
High RPMs: 5.5PSI

Given that it's 0.6*14.7 = 8.8PSI at sea level, it looks like the stock ECU is compensating about 1.2PSI, which is about half of the actual ambient pressure loss.

Once I'm on a procede map though, the 14PSI that Shiv is seeing is about 6PSI over stock.

Assuming that PROcede doesn't interfere with altitude compensation, it looks like I should be getting 6+1.2 = 8.2PSI over stock. That is clearly not happening. I am getting about 4PSI over stock! If you take out the "expected" altitude compensation, I should be getting 6PSI over stock. It's a bit odd that I'm only getting 4PSI! Especially when the Alpina is easily getting the boost I want!

Perhaps Shiv needs to release a separate map for us higher altitude folks. My friend has an STi with a Cobb Accessport (similar to PROcede) and he runs a special high altitude map. The high altitude map produces significantly better results for him than using a standard sea level map.

Shiv?

[trickydick]

Originally Posted by leftcoastman

Alrighty, I went out with the stock map and got the following results from a 3rd gear rollon:

Peak: 10psi
Midrange: 6PSI
High RPMs: 5.5PSI

Given that it's 0.6*14.7 = 8.8PSI at sea level, it looks like the stock ECU is compensating about 1.2PSI, which is about half of the actual ambient pressure loss.

Once I'm on a procede map though, the 14PSI that Shiv is seeing is about 6PSI over stock.

Assuming that PROcede doesn't interfere with altitude compensation, it looks like I should be getting 6+1.2 = 8.2PSI over stock. That is clearly not happening. I am getting about 4PSI over stock! If you take out the "expected" altitude compensation, I should be getting 6PSI over stock. It's a bit odd that I'm only getting 4PSI! Especially when the Alpina is easily getting the boost I want!

Perhaps Shiv needs to release a separate map for us higher altitude folks. My friend has an STi with a Cobb Accessport (similar to PROcede) and he runs a special high altitude map. The high altitude map produces significantly better results for him than using a standard sea level map.

Shiv?

+1

[musc]

Originally Posted by leftcoastman

Alrighty, I went out with the stock map and got the following results from a 3rd gear rollon:

Peak: 10psi
Midrange: 6PSI
High RPMs: 5.5PSI

Given that it's 0.6*14.7 = 8.8PSI at sea level, it looks like the stock ECU is compensating about 1.2PSI, which is about half of the actual ambient pressure loss.

Once I'm on a procede map though, the 14PSI that Shiv is seeing is about 6PSI over stock.

Assuming that PROcede doesn't interfere with altitude compensation, it looks like I should be getting 6+1.2 = 8.2PSI over stock. That is clearly not happening. I am getting about 4PSI over stock! If you take out the "expected" altitude compensation, I should be getting 6PSI over stock. It's a bit odd that I'm only getting 4PSI! Especially when the Alpina is easily getting the boost I want!

Perhaps Shiv needs to release a separate map for us higher altitude folks. My friend has an STi with a Cobb Accessport (similar to PROcede) and he runs a special high altitude map. The high altitude map produces significantly better results for him than using a standard sea level map.

Shiv?

Yes it does look like you should be making more boost, but this also assuming your car makes exactly 8.8 psi stock at sea level. I know its rated at 0.6 bar, but there is always going to be variances in turbos, logging software, etc. It might be impossible where you live, but it would be beneficial to run your car stock at near sea level, then run the PROcede map at sea level, and log the findings.

[OpenFlash]

Depending on conditions (temp, baro, etc,.) a stock 335 makes anywhere from 6-8psi at sea level. The "stock map" you loaded isn't absolutely stock. And I don't know what else to say with regards to the altitude compensation other than it is still in effect with the PROcede. There are provisions in the factory ECU that prohibit boost control duty cycle to exceed a certain limit. This is to prevent overspinning the turbo as one would be doing in trying to achieve the sea level MAP targets at 5800' above sea level. The factory ECU DOES NOT compensate completely for air thinness. And it's compensation ability decreases as altitude increases. I wish these weren't the facts but they are. There is no "high alitude" map that would fix this at this point. There certainly can be some released in the future but I can only assume the factory limits turbine shaft speed for a reason. We are always pushing the edge over here with our own shop car. But seeing what is safe and what is not takes more than a few weeks of testing.

Shiv

[leftcoastman]

Originally Posted by shiv@vishnu

Depending on conditions (temp, baro, etc,.) a stock 335 makes anywhere from 6-8psi at sea level. The "stock map" you loaded isn't absolutely stock. And I don't know what else to say with regards to the altitude compensation other than it is still in effect with the PROcede. There are provisions in the factory ECU that prohibit boost control duty cycle to exceed a certain limit. This is to prevent overspinning the turbo as one would be doing in trying to achieve the sea level MAP targets at 5800' above sea level. The factory ECU DOES NOT compensate completely for air thinness. And it's compensation ability decreases as altitude increases. I wish these weren't the facts but they are. There is no "high alitude" map that would fix this at this point. There certainly can be some released in the future but I can only assume the factory limits turbine shaft speed for a reason. We are always pushing the edge over here with our own shop car. But seeing what is safe and what is not takes more than a few weeks of testing.

Shiv

Well Shiv, you know I have always been a supporter of you and your products. You have an excellent background (remember our chat during install?) and I think you can figure this one out.

I hope you do get some time to test out a high altitude map. AA apparently has a high altitude map available, but I'm holding off for now b/c I feel you could probably do it better.

Let me know if you want me to do any testing of a higher altitude file. I have easy access to some extreme altitude. As you've seen, I'm pretty rigorous with my analysis. I have multiple megabytes of log files right now.

I am not alone in my hope for a higher altitude map.

[Terry335]

Originally Posted by leftcoastman

Well Shiv, you know I have always been a supporter of you and your products. You have an excellent background (remember our chat during install?) and I think you can figure this one out.

I hope you do get some time to test out a high altitude map. AA apparently has a high altitude map available, but I'm holding off for now b/c I feel you could probably do it better.

Let me know if you want me to do any testing of a higher altitude file. I have easy access to some extreme altitude. As you've seen, I'm pretty rigorous with my analysis. I have multiple megabytes of log files right now.

I am not alone in my hope for a higher altitude map.

Get some scanning software and I'll mail you a device to set the boost to whatever you want.

[Cadence]

Originally Posted by leftcoastman

I am not alone in my hope for a higher altitude map.

What happens when you take your high alititude mapped car down to sea level?

[3X5PSI]

LeftCoastman, I have just driven 5 hours down to sea-level for a vacation. Went out & did some logs just now. Will do more in the morning & then post. But I can tell you this. There is definitely altitude compensation. It boosts more at altitude. I'm a bit surprised at how little it boosts down here at the coast, but I'm not complaining as its fast as hell. Had some runs with a few buddies with modd'd E46 M3's & ran away from them.

[leftcoastman]

Originally Posted by 3X5PSI

LeftCoastman, I have just driven 5 hours down to sea-level for a vacation. Went out & did some logs just now. Will do more in the morning & then post. But I can tell you this. There is definitely altitude compensation. It boosts more at altitude. I'm a bit surprised at how little it boosts down here at the coast, but I'm not complaining as its fast as hell. Had some runs with a few buddies with modd'd E46 M3's & ran away from them.

That's sort of good and bad news. Email me the logs, I'd love to see them.

Odd that you're boosting much less. Most guys are getting 14psi boost at sea level. You weren't getting much more than that (if any) at altitude. But shoot me the logs and I'd love to see them. Cheers.

Oh and try to do some 1/4 mile runs. Even if you don't have access to the VBOX like before, just log an entire 1/4 mile run on the PROcede and we'll figure out your 1/4 mile times from that.

[OpenFlash]

Keep in mind that the 13-14psi that sea level folks are seeing is only up to 4500rpm or so (and only for a quick spike at that) Most of the time, it should run 11-12psi. And just before redline, it drops down to ~10psi.

shiv

[3X5PSI]

Originally Posted by shiv@vishnu

Keep in mind that the 13-14psi that sea level folks are seeing is only up to 4500rpm or so (and only for a quick spike at that) Most of the time, it should run 11-12psi. And just before redline, it drops down to ~10psi.

shiv

Right on the money! never doubt Shiv, he speaketh the truth. I found you may get a spike for 200-300rpm of 13.5-14psi especially in the lower gears, but it's just a spike.

If you find a long straight uphill, load it up in 4th from 1500-6500rpm, you will see that it settles at 11-12psi from 2500-3000 all the way to almost 5000rpm, before it drops back.

I find at altitude it follows a similar trend albeit it doesn't hold 12psi as lond & with slightly less boost at higher revs. HOWEVER, we are starting at -2psi at altitude, so in effect it is holding 14psi.

I will get some logs & graph at altitude vs sea-level on the same graph. But right now I gotta' get off the laptop or else the wife gonna beat me up with a roling pin.

[midlife]

I am not alone in my hope for a higher altitude map. [/QUOTE]

count me in, and i am sure alot of the guys in upstate NY, vermont, colorado, etc will support you (buy it).

_______________
2008 335 convert: on order
1968 Chevelee SS 396 convert
'94 M3 retired
'95 540i retired
'81 911 carerra retired