Supercharger at high altitude??
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Member
Joined: Jan 2001
Posts: 63
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From: Greeley, CO USA
Supercharger at high altitude??
Hey Gang, at high altitudes (Denver, Mile High) does the psi boost decrease as compared to at sea level??
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Jeff Randol
2000 Ford F150
Ext. Cab 4x4 Lariat
5.4 Auto, Off Road Package, Fully Loaded
& lovin it!!
MODS: KN Air Filter
Glasspack exhaust
Upcoming: AMSOIL Dual Oil filter system, FIPK, Fiberglass Topper, Spray-In Bedliner, Wood Dash Kit
------------------
Jeff Randol
2000 Ford F150
Ext. Cab 4x4 Lariat
5.4 Auto, Off Road Package, Fully Loaded
& lovin it!!
MODS: KN Air Filter
Glasspack exhaust
Upcoming: AMSOIL Dual Oil filter system, FIPK, Fiberglass Topper, Spray-In Bedliner, Wood Dash Kit
Senior Member
Joined: Jan 2000
Posts: 214
Likes: 0
From: Penn Yan, NY
Yes!
The higher your altitude, the thinner the air and therfore your boost ie., pounds per square inch will decrease.
I wouldn't think that it wouldn't be much but maybe someone who is Supercharged and at altitude can answer how much?
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2000 XLT supercab, 4x4 7700lb. package, 5.4L, 3.73 LS, 265 BFG All Terrains on Epic 16x8's, skids,rear sway-bar,Edelbrock shocks,Rhino brush gaurd,KC Daylighters,CD changer,MagnaCharger, Flowmaster,Superchip, Airaid, Replaced the JUNK Gibson Headers with Jet Black coated JBA's, Captains with Expy console, Island Blue,GSD Schutzhund III anti-theft device.
The higher your altitude, the thinner the air and therfore your boost ie., pounds per square inch will decrease.
I wouldn't think that it wouldn't be much but maybe someone who is Supercharged and at altitude can answer how much?
------------------
2000 XLT supercab, 4x4 7700lb. package, 5.4L, 3.73 LS, 265 BFG All Terrains on Epic 16x8's, skids,rear sway-bar,Edelbrock shocks,Rhino brush gaurd,KC Daylighters,CD changer,MagnaCharger, Flowmaster,Superchip, Airaid, Replaced the JUNK Gibson Headers with Jet Black coated JBA's, Captains with Expy console, Island Blue,GSD Schutzhund III anti-theft device.
Senior Member
Joined: Mar 2001
Posts: 161
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From: Austin, TX, USA
you will have less boost (and therefore less power) at high altitludes, but you will have an even greater advantage over non-supercharged engines than you do at sea level, because they're still trying to breathe the thin air and you have help... also you supercharger will not draw as much power from your engine because the air is thinner. you will see a performance drop, but not as much as a NA engine.
ALL high-performance piston aircraft are turbocharged or supercharged, because over about 10,000 feet a NA engine really starts to suffer. P-51 mustangs, which had a 2-stage blower could fly at over 40,000 feet. using the rolls-royce merlin engine:
1640 cid, all aluminum, 2-stage supercharged, DOHC 48v. V-12, variants have produced over 2200 hp (and thats at 3200 rpm!). (it ran 38 pounds of boost at sea level and used 115 octane fuel)
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2001 F-150 XL SWB
4.2L 5-spd, 3.55
ALL high-performance piston aircraft are turbocharged or supercharged, because over about 10,000 feet a NA engine really starts to suffer. P-51 mustangs, which had a 2-stage blower could fly at over 40,000 feet. using the rolls-royce merlin engine:
1640 cid, all aluminum, 2-stage supercharged, DOHC 48v. V-12, variants have produced over 2200 hp (and thats at 3200 rpm!). (it ran 38 pounds of boost at sea level and used 115 octane fuel)
------------------
2001 F-150 XL SWB
4.2L 5-spd, 3.55
Thread Starter
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Joined: Jan 2001
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From: Greeley, CO USA
<font face="Verdana, Arial" size="2">Originally posted by jrm1493:
you will have less boost (and therefore less power) at high altitludes, but you will have an even greater advantage over non-supercharged engines than you do at sea level, because they're still trying to breathe the thin air and you have help... also you supercharger will not draw as much power from your engine because the air is thinner. you will see a performance drop, but not as much as a NA engine.
ALL high-performance piston aircraft are turbocharged or supercharged, because over about 10,000 feet a NA engine really starts to suffer. P-51 mustangs, which had a 2-stage blower could fly at over 40,000 feet. using the rolls-royce merlin engine:
1640 cid, all aluminum, 2-stage supercharged, DOHC 48v. V-12, variants have produced over 2200 hp (and thats at 3200 rpm!). (it ran 38 pounds of boost at sea level and used 115 octane fuel)
</font>
you will have less boost (and therefore less power) at high altitludes, but you will have an even greater advantage over non-supercharged engines than you do at sea level, because they're still trying to breathe the thin air and you have help... also you supercharger will not draw as much power from your engine because the air is thinner. you will see a performance drop, but not as much as a NA engine.
ALL high-performance piston aircraft are turbocharged or supercharged, because over about 10,000 feet a NA engine really starts to suffer. P-51 mustangs, which had a 2-stage blower could fly at over 40,000 feet. using the rolls-royce merlin engine:
1640 cid, all aluminum, 2-stage supercharged, DOHC 48v. V-12, variants have produced over 2200 hp (and thats at 3200 rpm!). (it ran 38 pounds of boost at sea level and used 115 octane fuel)
</font>
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Jeff Randol
2000 Ford F150
Ext. Cab 4x4 Lariat
5.4 Auto, Off Road Package, Fully Loaded
& lovin it!!
MODS: KN Air Filter
Glasspack exhaust
Upcoming: AMSOIL Dual Oil filter system, FIPK, Fiberglass Topper, Spray-In Bedliner, Wood Dash Kit
Senior Member
Joined: Mar 2001
Posts: 161
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From: Austin, TX, USA
i've always been an aviation nut, ever since my first ride in a piper navajo at age 4... i guess cars (and trucks) are my second love behind planes. i dont have my lisence yet, but as soon as i finish my master's degree (in aerospace enginnering...) and get a real job that's the first thing i'll do.
i fly quite often with a friend who has a private license, and he lets me fly basically the entire time (if i pay) and he gets the hours... but the biggest thing i've ever flown is an old 172, and usually we take a 152 acrobat up because its a little more fun (though certainly underpowered). we usually just fly over the central texas hill country at low altitude (~100 feet), its really fun... don't know if its legal though (i know how to fly (thanks to ms flightsim and my friend) but i dont know the rules or anything)
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2001 F-150 XL SWB
4.2L 5-spd, 3.55
i fly quite often with a friend who has a private license, and he lets me fly basically the entire time (if i pay) and he gets the hours... but the biggest thing i've ever flown is an old 172, and usually we take a 152 acrobat up because its a little more fun (though certainly underpowered). we usually just fly over the central texas hill country at low altitude (~100 feet), its really fun... don't know if its legal though (i know how to fly (thanks to ms flightsim and my friend) but i dont know the rules or anything)
------------------
2001 F-150 XL SWB
4.2L 5-spd, 3.55
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Member
Joined: Jan 2001
Posts: 63
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From: Greeley, CO USA
<font face="Verdana, Arial" size="2">Originally posted by jrm1493:
i've always been an aviation nut, ever since my first ride in a piper navajo at age 4... i guess cars (and trucks) are my second love behind planes. i dont have my lisence yet, but as soon as i finish my master's degree (in aerospace enginnering...) and get a real job that's the first thing i'll do.
i fly quite often with a friend who has a private license, and he lets me fly basically the entire time (if i pay) and he gets the hours... but the biggest thing i've ever flown is an old 172, and usually we take a 152 acrobat up because its a little more fun (though certainly underpowered). we usually just fly over the central texas hill country at low altitude (~100 feet), its really fun... don't know if its legal though (i know how to fly (thanks to ms flightsim and my friend) but i dont know the rules or anything)
</font>
i've always been an aviation nut, ever since my first ride in a piper navajo at age 4... i guess cars (and trucks) are my second love behind planes. i dont have my lisence yet, but as soon as i finish my master's degree (in aerospace enginnering...) and get a real job that's the first thing i'll do.
i fly quite often with a friend who has a private license, and he lets me fly basically the entire time (if i pay) and he gets the hours... but the biggest thing i've ever flown is an old 172, and usually we take a 152 acrobat up because its a little more fun (though certainly underpowered). we usually just fly over the central texas hill country at low altitude (~100 feet), its really fun... don't know if its legal though (i know how to fly (thanks to ms flightsim and my friend) but i dont know the rules or anything)
</font>
------------------
Jeff Randol
2000 Ford F150
Ext. Cab 4x4 Lariat
5.4 Auto, Off Road Package, Fully Loaded
& lovin it!!
MODS: KN FIPK GEN. 2
Glasspack exhaust
Upcoming: AMSOIL Dual Oil filter system, Fiberglass Topper, Spray-In Bedliner, Wood Dash Kit, Supercharger!!
Senior Member
Joined: Jan 2000
Posts: 214
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From: Penn Yan, NY
Hey you guys want a job?
I work for a company that builds piston aircraft engines.
check out www.pennyanaero.com
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2000 XLT supercab, 4x4 7700lb. package, 5.4L, 3.73 LS, 265 BFG All Terrains on Epic 16x8's, skids,rear sway-bar,Edelbrock shocks,Rhino brush gaurd,KC Daylighters,CD changer,MagnaCharger, Flowmaster,Superchip, Airaid, Replaced the JUNK Gibson Headers with Jet Black coated JBA's, Captains with Expy console, Island Blue,GSD Schutzhund III anti-theft device.
I work for a company that builds piston aircraft engines.
check out www.pennyanaero.com
------------------
2000 XLT supercab, 4x4 7700lb. package, 5.4L, 3.73 LS, 265 BFG All Terrains on Epic 16x8's, skids,rear sway-bar,Edelbrock shocks,Rhino brush gaurd,KC Daylighters,CD changer,MagnaCharger, Flowmaster,Superchip, Airaid, Replaced the JUNK Gibson Headers with Jet Black coated JBA's, Captains with Expy console, Island Blue,GSD Schutzhund III anti-theft device.
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Senior Member
Joined: Mar 2001
Posts: 161
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From: Austin, TX, USA
yep, i figured that type of flying was illegal, my friend claims its ok as long as there is no property or people below you... theres nothing out there to run into except for a few short mesquite trees and some cattle (they're very scared of small planes 
... we try to be careful, but i guess its not too smart.
well thanks for the job offer *****, but i've just started grad school (like 1 week ago), so i won't be out for at least a year and a half... i looked at your site though, your company sounds cool. i really enjoy rebuilding engines (my roomate and i are building a chevy 383 stroker right now actually.... yes hes a foolish bowtie bubba, but its better than living with a ricer i guess).
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2001 F-150 XL SWB
4.2L 5-spd, 3.55
Other Cars:
(Dad's truck)
2001 F-150 SuperCrew XLT, 5.4L, Towing Package w/wrong radiator.
(Former - RIP)
1994 Honda Civic DX Hatchback, 1.5L, 5-spd. Shared it with my sister in high school... recently totaled when she was driving with only 1 contact lens in.
(Roomate's Project Car)
1983 Chevy Camaro
383 Stroker, Tremec T-5, 4.10, AFR Heads, Edelbrock Intake, custom cam, etc... ~500 hp (not quite built yet)
(Girlfriend)
1997 Saturn SL(ow)
Breaks down alot... also equipped with firestone death-tires as we found out a couple of weeks ago while going 75 mph... luckily she managed to pull it off the highway safely.
University of Texas at Austin, Class of 2001
... we try to be careful, but i guess its not too smart.well thanks for the job offer *****, but i've just started grad school (like 1 week ago), so i won't be out for at least a year and a half... i looked at your site though, your company sounds cool. i really enjoy rebuilding engines (my roomate and i are building a chevy 383 stroker right now actually.... yes hes a foolish bowtie bubba, but its better than living with a ricer i guess).
------------------
2001 F-150 XL SWB
4.2L 5-spd, 3.55
Other Cars:
(Dad's truck)
2001 F-150 SuperCrew XLT, 5.4L, Towing Package w/wrong radiator.
(Former - RIP)
1994 Honda Civic DX Hatchback, 1.5L, 5-spd. Shared it with my sister in high school... recently totaled when she was driving with only 1 contact lens in.
(Roomate's Project Car)
1983 Chevy Camaro
383 Stroker, Tremec T-5, 4.10, AFR Heads, Edelbrock Intake, custom cam, etc... ~500 hp (not quite built yet)
(Girlfriend)
1997 Saturn SL(ow)
Breaks down alot... also equipped with firestone death-tires as we found out a couple of weeks ago while going 75 mph... luckily she managed to pull it off the highway safely.
University of Texas at Austin, Class of 2001
Member
Joined: Oct 2000
Posts: 59
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From: Tempe, AZ, USA
Com'on you guys. You know that super charger (wish I had one) has a waste gate pressure control and therefore produces the SAME PSI regardless of ambient air pressure. That's the whole point of a SC. From the factory it’s set to something mild like 1.1 atmospheres but whatever it is it stays the same. And should blow (ha ha) away standard aspirated engines
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2001 Ford F-150 Super Crew XLT Deep Wedgwood Blue 4x4 Crew Cab 139 WB
Ordered: 10/7/00; Produced: 11/15; Delivered: 11/28; Discovered 1.2” Radiator: 5/20/01
Trailer Tow Group, Class III; 3.55 LSA; 5.4L; 1.02” Radiator!
Pictures And Details: http://www.public.asu.edu/~james/FORD
------------------
2001 Ford F-150 Super Crew XLT Deep Wedgwood Blue 4x4 Crew Cab 139 WB
Ordered: 10/7/00; Produced: 11/15; Delivered: 11/28; Discovered 1.2” Radiator: 5/20/01
Trailer Tow Group, Class III; 3.55 LSA; 5.4L; 1.02” Radiator!
Pictures And Details: http://www.public.asu.edu/~james/FORD
Senior Member
Joined: Mar 2001
Posts: 161
Likes: 0
From: Austin, TX, USA
thats true... so while the blown truck is getting the same manifold pressure as it would at sea level, all the other cars are getting like 80% of what they would due to the altitude... so there is a greater advantage for the supercharged truck.
------------------
2001 F-150 XL SWB
4.2L 5-spd, 3.55
-----------------
Other Cars:
2001 F-150 SuperCrew (Dad's) XLT, 5.4L, Towing Package w/wrong radiator.
1994 Honda Civic DX Hatchback, 1.5L, 5-spd. Shared it with my sister in high school... recently totaled when she was driving with only 1 contact lens in.
1983 Chevy Camaro (Roomate's) 383 Stroker, Tremec T-5, 4.10, AFR Heads, Edelbrock Intake, custom cam, etc... ~500 hp (not quite built yet)
1997 Saturn SL(ow) (Girlfriend's) Breaks down alot... also equipped with firestone death-tires as we found out a couple of weeks ago while going 75 mph... luckily she managed to pull it off the highway safely.
University of Texas at Austin, Class of 2001
------------------
2001 F-150 XL SWB
4.2L 5-spd, 3.55
-----------------
Other Cars:
2001 F-150 SuperCrew (Dad's) XLT, 5.4L, Towing Package w/wrong radiator.
1994 Honda Civic DX Hatchback, 1.5L, 5-spd. Shared it with my sister in high school... recently totaled when she was driving with only 1 contact lens in.
1983 Chevy Camaro (Roomate's) 383 Stroker, Tremec T-5, 4.10, AFR Heads, Edelbrock Intake, custom cam, etc... ~500 hp (not quite built yet)
1997 Saturn SL(ow) (Girlfriend's) Breaks down alot... also equipped with firestone death-tires as we found out a couple of weeks ago while going 75 mph... luckily she managed to pull it off the highway safely.
University of Texas at Austin, Class of 2001