Cobb AccessPORT Discussion
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Joined: Jan 2007
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From: everywherez...
has money, but unsure
Joined: Mar 2008
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From: find bombs, afghanistan
yes, someone should make something like that for the AP
i will just take the IV-keggerator.
i will just take the IV-keggerator.
I JUST mentioned in another thread having an idea on what to do with a couple V2 and V3 BHR radiators I have laying around. Turning them into Beer Chargers. Instantaneous beer chillers that use CO2 or nitrous through intercooler spraybars mounted to the rad core. Who says BHR builds useless stuff?
it will be in the semi keg form..beers
Mu ha.. ha...
Joined: Aug 2004
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From: Cali
Doppelgänger
Joined: Feb 2008
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From: Florida
I JUST mentioned in another thread having an idea on what to do with a couple V2 and V3 BHR radiators I have laying around. Turning them into Beer Chargers. Instantaneous beer chillers that use CO2 or nitrous through intercooler spraybars mounted to the rad core. Who says BHR builds useless stuff?
I don't mean to derail the fun but I have a technical question. :P
Why is it that on some cars, the standard NA maps run the car rich above 5krpm?
Is this allowed to be explained without giving away secrets? The way I understood this stuff worked was that you more-or-less tell the ecu to shoot for a target lambda and it uses the fuel trims to get there.
Side note: I had my car driving around with the AP uninstalled yesterday and the CEL never came on with the catless midpipe. Non-functioning codes scare me.
Why is it that on some cars, the standard NA maps run the car rich above 5krpm?
Is this allowed to be explained without giving away secrets? The way I understood this stuff worked was that you more-or-less tell the ecu to shoot for a target lambda and it uses the fuel trims to get there.
Side note: I had my car driving around with the AP uninstalled yesterday and the CEL never came on with the catless midpipe. Non-functioning codes scare me.
Last edited by qtwre; May 9, 2008 at 08:29 AM.
Banned
Joined: Jan 2007
Posts: 2,756
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From: everywherez...
I don't mean to derail the fun but I have a technical question. :P
Why is it that on some cars, the standard NA maps run the car rich above 5krpm?
Is this allowed to be explained without giving away secrets? The way I understood this stuff worked was that you more-or-less tell the ecu to shoot for a target lambda and it uses the fuel trims to get there.
Side note: I had my car driving around with the AP uninstalled yesterday and the CEL never came on with the catless midpipe. Non-functioning codes scare me.
Why is it that on some cars, the standard NA maps run the car rich above 5krpm?
Is this allowed to be explained without giving away secrets? The way I understood this stuff worked was that you more-or-less tell the ecu to shoot for a target lambda and it uses the fuel trims to get there.
Side note: I had my car driving around with the AP uninstalled yesterday and the CEL never came on with the catless midpipe. Non-functioning codes scare me.
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Joined: Feb 2008
Posts: 3,192
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From: Florida
You need to meet a few requirements before the car triggers the cel. Also some cars (usually 2004s) don't show missing cat cels at all, or as easily.
I was wondering if we could get a technical lesson on why this happens. Fuel trims are working but trimming to the wrong target.
Its a combination of MAF calibration and injector "slop".
There is a wide range of injector output. Just because the primaries are supposed to be 290cc doesn't mean they are.
They can be anywhere from 276cc - 312cc and still be in spec.
The 380cc secondaries can range from 356cc - 404cc. The P2s the same.
That is a HUGE difference in lambda.
When you cross the open-loop threshold, the PCM calculates fuel without regard to this variation, so a command for a particular lambda target could yield just about anything.
There is a wide range of injector output. Just because the primaries are supposed to be 290cc doesn't mean they are.
They can be anywhere from 276cc - 312cc and still be in spec.
The 380cc secondaries can range from 356cc - 404cc. The P2s the same.
That is a HUGE difference in lambda.
When you cross the open-loop threshold, the PCM calculates fuel without regard to this variation, so a command for a particular lambda target could yield just about anything.
Last edited by MazdaManiac; May 9, 2008 at 10:38 AM.
Good explanation. I forgot about open loop.
I only looked briefly as I was driving but around 7krpm in third at high-ish load I was in the 11s. Do you offer a set of maps to offset this or do you currently only have extra maps for lean cars?
I only looked briefly as I was driving but around 7krpm in third at high-ish load I was in the 11s. Do you offer a set of maps to offset this or do you currently only have extra maps for lean cars?
