How do non-DBW ECUs control boost?
09-19-2003, 05:32 PM
#1
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How do non-DBW ECUs control boost?
Since we don't have a MAP sensor but only a MAF and its so easy to overload a MAF aparently.
How is it done?
How does it prevent turbo overspool?
(with a MAP sensor is easy, but a MAF alone???)
How is it done?
How does it prevent turbo overspool?
(with a MAP sensor is easy, but a MAF alone???)
09-19-2003, 06:04 PM
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As I understand it the wastegate opens and vents exhuast out, instead of driving the turbo.
On older turbo's a spring tension to control the wastegate. New cars use a soleniod to control the wastege, allowing tuning to be done through the computer to control when the soleniod operates.
09-19-2003, 07:12 PM
#3
Not an exact definition, trying to keep it simple......
NDBW's use maps, deviated by MAF, O2, ECT, knock, load, & throttle angle sensors.
DBW's use the same things, but also add in the MAP sensor in the IC. This allows for more smooth power.
Both have a solenoid valve that control the wastegate, the N75 valve, electronically controlled by the ECU.
Both utilize parameters for each sensor, which set DTC's when those parameters are exceeded. Depending on which one is out, the ECU then has additional maps commonly referred to as "limp mode".
Limp mode can utilize several things to reduce damage to the engine. advance/retard ignition, zero out boost, ignore sensors as determined faulty by the ECU maps, etc, while still allowing you to "limp" home....
Confused yet? ;-D
DBW's use the same things, but also add in the MAP sensor in the IC. This allows for more smooth power.
Both have a solenoid valve that control the wastegate, the N75 valve, electronically controlled by the ECU.
Both utilize parameters for each sensor, which set DTC's when those parameters are exceeded. Depending on which one is out, the ECU then has additional maps commonly referred to as "limp mode".
Limp mode can utilize several things to reduce damage to the engine. advance/retard ignition, zero out boost, ignore sensors as determined faulty by the ECU maps, etc, while still allowing you to "limp" home....
Confused yet? ;-D
09-19-2003, 11:47 PM
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Re: Not an exact definition, trying to keep it simple......
well, I understand all that you explain, except I still fail to see how the non-DBW A4 1.8t can acurately control boost to 1.0bar for example.
How does it know if its at 1.0 bar as opposed to 1.2bar.
I didn't think the MAF was that accurate.
How does it know if its at 1.0 bar as opposed to 1.2bar.
I didn't think the MAF was that accurate.
09-20-2003, 03:32 AM
#5
Between the MAF, O2 sensor, throttle, rpms, engine load and using the maps of where the ecu
thinks everything is supposed to be at, it knows when to start bleeding exhaust through the wastegate to maintain 1.0 bar. That's (in a nutshell) what gets changed when programmers create a higher powered chip, by altering the maps to allow higher boost.
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09-23-2003, 08:42 AM
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Re: how is does the K03 work with a 2.0liter?
well, until I can get an intercooler installed I'm running with 0 boost.
But, I'm sure youre right. Since the K03 is too small for a 1.8 I can't even imagine whats going to happen once I get the thing connected.
But, I'm sure youre right. Since the K03 is too small for a 1.8 I can't even imagine whats going to happen once I get the thing connected.
09-23-2003, 03:48 PM
#10
There's a new turbo kit out (E-05), that's designed for the 2.0L....
It's higher cfm than a K-04, and not quite as aggressive as the T28 or APR's S3. It costs around $12-1300 for the kit, and can be run on any K-04 software but with TT 225 injectors. Also, here's a clue, it's sold by the same company that sells the 2.0L parts, and it bolts right up to the stock cat & manifold.....
I have yet to play with this new turbo setup, therefore I have no testimonials, but I think I may be leaning towards trying it....
I have yet to play with this new turbo setup, therefore I have no testimonials, but I think I may be leaning towards trying it....
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