OK I boosted my car, Now I have a 4 psig (27500pa) setup
I Live in a place with 9200 feet of altitud, now MAP is Absolut Presure so when in WOT I read on my scanner (Autotap) 70 kpa on the MAP without boost.
Now if I connect boost and boost gauge reads 4 psi (27.5kpa), It is supposed that the MAP will read at WOT 95kpa and my ECU and stock inyectors should be able to manage this amount of boost..
I'm right or boost is boost no matter of altitud and should get worried about fuel management.
I run 16.2 at sea level, now in my city I run 17.9 without boost and with boost I run 16.5.
Based on this I suppose my car run extremely RICH when in WOT at this altitud.
Anyway I want to run 10 psi of boost so I will upgrade to bigger inyectors and use a SAFC or something.
Just want to hear some opinions.
Tnks
sounds like you already have it figured out.
4psi at altitude would probably be 6psi at sea level... it can be calculated out.
turbo or roots blower makes a difference... if its a turbo/centrifugal a BOV would take care of the issue really... as long as it is calibrated for sea level air pressure and not relative air pressure
14.82 @ 97 mph
well, this is gonna piss you off, but your car will never run perfect or be fast in that kind of altitude. air is just too thin.
I was a retard, and now I'm permanently banned.
Spotabee Racing wrote:
Quote:
well, this is gonna piss you off, but your car will never run perfect or be fast in that kind of altitude. air is just too thin
The whole reason why turbo's where designed was for high altitude use. Turbo's are used in piston driven engines at high altitudes to compress thin air into usable dense compressed air to propely combust. German's Mesurschimt airplanes used root style blowers to help compress air to fly at high altitudes.
The only thing that is bad about high altitude driving(in mountains) is the temperature. Temperatures at higher altitudes, which throws computers to use more fuel. If a car is designed to work at 600ft above sea level, and you live in 9000ft above sea level, then temperature are going to affect the computer (IAT sensor) to use more fuel.
So for the statement above, that doesn't apply. You'll just have to tune a little more.
T04B V-trim baby.....Time to Open a Can of Whoop A S S !!!
Diesell wrote:Spotabee Racing wrote:
Quote:
well, this is gonna piss you off, but your car will never run perfect or be fast in that kind of altitude. air is just too thin
The whole reason why turbo's where designed was for high altitude use. Turbo's are used in piston driven engines at high altitudes to compress thin air into usable dense compressed air to propely combust. German's Mesurschimt airplanes used root style blowers to help compress air to fly at high altitudes.
The only thing that is bad about high altitude driving(in mountains) is the temperature. Temperatures at higher altitudes, which throws computers to use more fuel. If a car is designed to work at 600ft above sea level, and you live in 9000ft above sea level, then temperature are going to affect the computer (IAT sensor) to use more fuel.
So for the statement above, that doesn't apply. You'll just have to tune a little more.
BAM! right on button... thats exatly it... and when you come down to sea level expect alot more power too ... at your altitude i would almost want to detune it slightly when comeing down to sea level ahah
The First Twin Charged jbody
blue car (R.I.P) - 240whp @7psi..
silver car - 305whp 315lbs.tq @15psi (91 Octane) or 420whp & 425lbs.TQ @20psi (94 octane+Alcohol Injection)
All dynos run on a Mustang dyno
^^^...................and BINGO was his namoooo!!!!
T04B V-trim baby.....Time to Open a Can of Whoop A S S !!!
I can only guess that your pcm has programming similar to US car programming. I don't know why it would be different.
1) 4 psig is 4 psig. It's 4 psi above base pressure, whether your base is at sea level or 10,000 ft above.
2) The PCM understands that air is less dense with altitude and will adjust fuel and spark to compensate. As you have seen, without boost, the WOT NA delivered fuel will be based on MAP readings at WOT NA, about 70 kPa.
3) Increasing manifold pressure for people living closer to sea level usually increases MAP beyond what the stock 1 BAR MAP sensor can read. The pcm does not know to increase the injector pulse width and the fuel delivery becomes lean. The pcm also fails to retard spark timing for increased cylinder pressure.
4) In your case the turbo adds enough pressure to bring MAP up to almost the same reading as WOT on an NA car at sea level. The MAP sensor can usually read to slightly over 100 kPa, maybe 101 or 102 kPa. Based on your information, I'd expect fuel delivery and spark timing to be close to correct with low amounts of boost. As you generate enough pressure to raise MAP above 100 kPa you will run into the same problems anyone else has with an add-on turbo.
5) You shouldn't try to drive your car at a lower altitude without a device to add additional fuel.
It's unfortunate that you have to add a turbo to achieve NA power levels, but if you ever do bring the car to sea level you'd better hang on!
-->Slow
