Track times STS vs front mount
07-29-2007, 02:35 PM
#11
Originally Posted by kbracing96
I think the best comparison will be when I get back down to Phoenix though. Don't think I'll pickup over a second over the STS there 
07-29-2007, 04:37 PM
#13
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Originally Posted by kbracing96
Actually, 11psi at sea-level is not 11psi at 5000' at least in ACTUAL air pressure (kPa). To get the same kPa, I would have to run 2psi more to be at the same air pressure.
07-29-2007, 05:22 PM
#14
Originally Posted by vanillagorilla
Shouldn't it be the same kPa though? It's all based off of what the wastegate is set at, the turbo will just have to spin harder, no? So if you see 13psi at 1200ft with cold air, you see 11psi with a 8200ft DA with the same WG/Boost controller settings?
) Up here, the gauge has to go to all most 10 psi to see 150 kPa on the scanner.
07-29-2007, 08:08 PM
#15
Originally Posted by vanillagorilla
Shouldn't it be the same kPa though? It's all based off of what the wastegate is set at, the turbo will just have to spin harder, no? So if you see 13psi at 1200ft with cold air, you see 11psi with a 8200ft DA with the same WG/Boost controller settings?
Hope that helps clear it up a bit.
At least this is my understanding of it.
Last edited by Spoolin; 07-29-2007 at 08:18 PM.
07-29-2007, 08:16 PM
#16
Exhaust leaks will kill an STS though -- you're bleeding exh pressure (which the kit is designed to have) temp and disrupting the pulse. at sea level and with exhaust leaks I couldn't spool past 4psi (but they were the crappiest welds I've ever seen for a supposedly gas tight setup... those welds are why I bought a welder and taught myself to weld lol)
07-29-2007, 08:20 PM
#17
Originally Posted by Spoolin
Altitude effects N/A engine's and Blown engine's more than they do turbo's but because the air is thinner, there is less oxygen per unit of air. So 11 psi at sea level and 11 psi at 8000 ft of Altitude has the same quantity/density of air being forced into the engine but there isn't the same quantity of Oxygen in that charge. Took me a while to understand that as well. I was always under the impression that turbo's were immune to Altitude changes because whatever a wastegate is set at is how much air your gonna feed your engine, which is true but air isn't what an engine needs, it's oxygene and there's less of it in each unit or air.
Hope that helps clear it up a bit.
At least this is my understanding of it.
Hope that helps clear it up a bit.
At least this is my understanding of it.
This is my understanding too -- at higher altitude the density of the air is less than at sea level.
07-29-2007, 08:52 PM
#18
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Originally Posted by kbracing96
I think the altitude and small exhaust leaks is what played the most into it. In the thin air, it didn't spool quickly, but look at my best, that 12.79 was at 1200' with cool air. I could brake stall boost down there, and I couldn't up here. That's a lot of the difference. Wilde's times where in similar conditions with cool temps and sea-level. My truck runs WAY different from sea-level to 5000'. The biggest difference is in the NA pre-boost area, and the front mount really minimizes that time, thats where it really performs. I was quite surprised that it picked up what it did, but at the track, it's almost all in the short time.
You guys who live at or around sea-level really don't understand how much altitude affects power.
You guys who live at or around sea-level really don't understand how much altitude affects power.
ok now that make more sense and yes i know what you mean about the altitude difference just had me a little worried cause i am about to put one on the excab
07-29-2007, 09:03 PM
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Originally Posted by Spoolin
Altitude effects N/A engine's and Blown engine's more than they do turbo's but because the air is thinner, there is less oxygen per unit of air. So 11 psi at sea level and 11 psi at 8000 ft of Altitude has the same quantity/density of air being forced into the engine but there isn't the same quantity of Oxygen in that charge. Took me a while to understand that as well. I was always under the impression that turbo's were immune to Altitude changes because whatever a wastegate is set at is how much air your gonna feed your engine, which is true but air isn't what an engine needs, it's oxygene and there's less of it in each unit or air.
Hope that helps clear it up a bit.
At least this is my understanding of it.
Hope that helps clear it up a bit.
At least this is my understanding of it.
make sense and now i have taken of all travel to the north off the calendar
