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06-23-2009, 10:58 AM | #1 |
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Low boost /w warmer weather
Quick question .. past few days its been about 75 - 85 degrees out
max boost in 4th will hit anywhere from 16 - 17 psi according to accessport its tuned for cobb stage 2 @ 17.5 i've already tried an ecu reset does weather really have that much effect on max boost? or could there be other issues like leaks. thanks
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06-23-2009, 11:06 AM | #2 |
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Are you using the AP as your engine management? I'm not really sure how flexible it is on the boost maps (i.e. does it pull boost when it's hot and humid to help save the engine), but my 03 tapered back boost on really hot days when it was in stock form. I guess what I'm saying is that your results don't seem odd to me.
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06-23-2009, 11:07 AM | #3 |
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seems normal, i boost slightly higher when it is cold out
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06-23-2009, 11:07 AM | #4 |
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That's pretty much how it is for most of us.
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06-23-2009, 11:08 AM | #5 |
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Is the loss consistent, or is it only happening during warm weather?
Hoses and tubes can become much more flexible during high heat and could possibly form a leak. The access port is using an off the shelf map, correct? You individual mods could result in a pressure drop. |
06-23-2009, 11:12 AM | #6 | |
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Quote:
i guess my question should be does the ecu pull boost because of higher temp btw mods are pretty standard stuff .. cobb downpipe .. catback exhaust .. stock airbox |
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06-23-2009, 12:39 PM | #7 | |
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My car would not hit its target boost, and respond kind of slugglish when hot so does my last car, the evo. But as the tempt changes, it makes adjustments by itself. On a hot day,on a long trip, I always pull over at a rest stop for some coffee to let my car cool alittle bit. |
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06-23-2009, 01:03 PM | #8 |
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It wont hit as high as boost when its hotter compared to colder air. Cold air is more dense than warm air.So not as much air is going in a short explanation.
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06-23-2009, 01:10 PM | #9 |
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06-23-2009, 01:44 PM | #10 |
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very normal
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06-23-2009, 02:00 PM | #11 |
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Gas expands with heat, which should increase pressure. Is the ECU pulling back boost to combat expansion from heat?
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06-23-2009, 03:27 PM | #12 |
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06-23-2009, 04:26 PM | #13 |
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Has nothing to do with the gas expansion. It has to do with the air temp as well as altitude. Both affect how dense the air is. If you live at see level and drive to a mountain with a much higher altitude. It would be PROBABLY be about the same as what your seeing now.
Hot temps = less air Cold temps = more air |
06-23-2009, 04:42 PM | #14 |
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you guys do realize there are correctional values in your maps based on intake temps right? Ie wastegate Correctional value (IAT) when reading 212 correct WG by 32% and such.... the ECU knows when its getting hot and how to correct to save you.
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06-23-2009, 04:45 PM | #15 |
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^^To save your car from blowing up? Not correct your map so it hits the max boost your map is set too.
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06-23-2009, 04:49 PM | #16 |
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And isn't this the whole reason we have intercoolers? To cool down air for better density/more power. My car always feels peppier in the winter vs summer. Hot days are nature's heat soak.
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06-23-2009, 04:52 PM | #17 |
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^^ yeah but its alot easier to get that cold air cold than it is summer air to the same density of a cold day.
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06-23-2009, 04:56 PM | #18 |
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well obviously. It's getting up to about 100deg today here - not saying any intercooler will make it like a -20 day in february
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06-23-2009, 04:58 PM | #19 |
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Exactly intercoolers can only do so much man.
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06-23-2009, 09:06 PM | #20 |
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06-24-2009, 06:27 AM | #21 |
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Nothing unusual here...
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06-24-2009, 09:38 AM | #22 | |
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Ignore the majority of everything else posted in this thread. Gotta' love nasioc and all of the internet experts |
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06-24-2009, 09:49 AM | #23 | |
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Quote:
As far as the post above, heat shouldn't be the entire equation... In addition, it should take a bit more heat than 75-85 ambient temps to cause it to limit boost. Spray your intercooler before your next run.... I would definitely knock being bigger deciding factor timing and such being pulled. Last edited by yamahaSHO; 06-24-2009 at 10:02 AM. |
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06-24-2009, 10:10 AM | #24 | |
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Quote:
i fixed it and the boost climbed a little bit, making me think its pulling because of the ambient temp |
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06-24-2009, 10:46 AM | #25 |
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It's definitely the heat, however, I'm willing to bet it's that combined with a small turbo that is giving you the lower boost and tapering off sooner.
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