Colder Weather = Easy Does It? - Page 2 - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Nov 8, 2006 | 05:48 PM

#16

killerbee

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Joined: Jun 2005

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killerbee is infamous around these parts

Quote:

There's more than just a knock sensor when it comes to knock supression and other safety features on the bosh motronic in our cars

Please elaborate.

Nov 8, 2006 | 06:53 PM

#17

iLLM3

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Joined: Aug 2005

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From: SOFLA/NYC

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I'm going to be honest, when the weather gets cold my car starts to scare me! Could be in my mind or do to several things, but I would take it easy at gt700 level, don't know :/

Nov 8, 2006 | 07:00 PM

#18

sharkster

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Joined: Jul 2003

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Quote:

Originally Posted by killerbee

Please elaborate.

The ECU has more than just a knock sensor to control boost, timing etc... there are a lot of other variables/sensors involved. Heh, now I'm getting way too deep into software (not my department

) and since I'm much more a hardware guy... **** I sound like an IT guy!?!?

Nov 8, 2006 | 07:05 PM

#19

sharkster

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Quote:

Originally Posted by yellowturbo

Before anything, thank you very much for helping clarify the situation.

A few more newbie questions:

1.) What's high load? Are we just saying hard acceleration (WOT) at the higher gears (4th gear, etc?) vs accelerating in 2nd or 3rd?

2.) how does the ecu determine what 'safe' is? Does it just allow the higher boost or more aggressive timing until it senses knock and then backs it down?

3.) 25psi is 1.7 bar right? (using 14.7 psi as atmospheric pressure). WOW!

Hi Yellow, my pleasure and I should be upfront here in saying that I am in NO WAY or SHAPE a programmer on any level (well ok I can do some AEM now and then lol) and the more in depth level questions are things that the guys coding the software know. Most of them chose to protect/secure their secrets so there's not much us hardware-level guys can do.

1)Yes that's high load 3rd/4th gear WOT
2)The ECU in basic terms has multiple maps/settings that it's able to pick based on gas, temps and so forth (too many variables to list and some that I don't even know).
3)1.7bar on the 100 is correct....