Yay! Finally got my Murf Stage "1.5" kit.
05-06-2011, 04:43 PM
#19
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05-06-2011, 05:16 PM
#21
Three Wheelin'
05-06-2011, 05:29 PM
#22
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05-06-2011, 06:47 PM
#23
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if setup = 11psi, with actual @ 6200ft = 8psi, what happens when you come down in elevation? Perhaps more focused, how do you control the boost when you don't need the altitude compensation (closer to sea level)?
05-06-2011, 07:01 PM
#24
Three Wheelin'
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Wisconsin's a lot lower than Colorado Springs. The fuel and spark maps were designed with lower elevations in mind. A large part of the idea, though, is that the single air inlet will restrict max boost at higher ambient pressures.
05-06-2011, 09:13 PM
#25
Three Wheelin'
I know you said it's a custom thing for you from Tim, but isn't that what the "new" Stage 1 is supposed to be? At least the FMU deletion sounds like something I read on here before. I'm REALLY wondering if I should go with a Stage 1 (also no FMU) or just jump in with both feet and be done with it.
05-06-2011, 09:23 PM
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05-06-2011, 09:57 PM
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05-06-2011, 10:01 PM
#29
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Well, yes, and no. The maps are based on mass flow. Tim should be filling in the whole map. The top parts of it are going to be the highest mass flow of air, which means WOT at high load and high boost.
WOT is WOT
Load is based largely on the dyno settings
Boost is based on RPM and air density
Since Wisconsin is much closer to sea level than Colorado Springs, air density for Tim will be higher than air density here, and the blower will have more air it can compress and shove into the engine. The initial absolute pressure will also be higher, which, combined with the extra boost, will result in higher mass flow than at the same throttle position, RPM, and load in Colorado Springs. In other words, in Wisconsin, all out, the cursor will run across the map higher up than it will in Colorado Springs.
Normally, when I am driving here, even at WOT and under full load, I won't be using the top cells in the map, but they will be there for me if and when I drive to lower elevations (like Sharktoberfest, maybe).
If I were to increase the boost capability of the system, like by adding a second inlet, then I might get to the top of the map while in Colorado Springs, but then I might be off the map, and in trouble, if I drove to sea level.
WOT is WOT
Load is based largely on the dyno settings
Boost is based on RPM and air density
Since Wisconsin is much closer to sea level than Colorado Springs, air density for Tim will be higher than air density here, and the blower will have more air it can compress and shove into the engine. The initial absolute pressure will also be higher, which, combined with the extra boost, will result in higher mass flow than at the same throttle position, RPM, and load in Colorado Springs. In other words, in Wisconsin, all out, the cursor will run across the map higher up than it will in Colorado Springs.
Normally, when I am driving here, even at WOT and under full load, I won't be using the top cells in the map, but they will be there for me if and when I drive to lower elevations (like Sharktoberfest, maybe).
If I were to increase the boost capability of the system, like by adding a second inlet, then I might get to the top of the map while in Colorado Springs, but then I might be off the map, and in trouble, if I drove to sea level.
05-06-2011, 10:02 PM
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I know you said it's a custom thing for you from Tim, but isn't that what the "new" Stage 1 is supposed to be? At least the FMU deletion sounds like something I read on here before. I'm REALLY wondering if I should go with a Stage 1 (also no FMU) or just jump in with both feet and be done with it.
The stage-1 kit is intended to be easy to upgrade to stage-3, if someone wanted to do that in the future. The new stage-1 makes upgrading even easier, since you already have the 42lb injectors with the stage-1. You also don't end up buying an FMU and the associated plumbing and fittings that you then don't have any use for when going to the stage-3. It does cost a little more to get the stage-1 and then later upgrade to the stage-3 than it would to go with the stage-3 initially though.