Diesel engines in speed boat
02-29-2008, 01:56 PM
#161
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good stuff
Dunno what they do but it works. It indexes the injectors so a set of them flow closer together than stock. I've used the the 90hp ones on marine QSB engines and they work perfectly with the stock programs on InCal. However I haven't had a chance to try them on the 480hp program yet.
03-02-2008, 09:44 PM
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03-03-2008, 10:38 AM
#164
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At the time of manufacturing, each injector is measured for flow rate at a few different points. At each point, an offset is identified, relative to the nominal flow rate. There are a finite number of pre-defines offset "buckets" that each can be grouped into, at each point. These buckets are combined to form an identifier for the injector and turned into a 2D bar code (data matrix). The data matrix is laser etched onto the injector. This is then read at the factory and programmed into the ECU. This information is used as an offset in the nominal calibration to fine tune the amount of fuel delivered (per injector).
It's called IQA (Injector Quantity Adjustment). If you have an injector replaced at a dealership, the scan tool is used to reprogram the ECU to the correct IQA value for the new injector.
This is primarily an emissions function to remove variance in fuel delivered. The adjustment is small enough that performance isn't really impacted to measurable degree. There are other manufacturing variables that would have a bigger impact on total engine output.
03-03-2008, 03:37 PM
#165
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At the time of manufacturing, each injector is measured for flow rate at a few different points. At each point, an offset is identified, relative to the nominal flow rate. There are a finite number of pre-defines offset "buckets" that each can be grouped into, at each point. These buckets are combined to form an identifier for the injector and turned into a 2D bar code (data matrix). The data matrix is laser etched onto the injector. This is then read at the factory and programmed into the ECU. This information is used as an offset in the nominal calibration to fine tune the amount of fuel delivered (per injector).
It's called IQA (Injector Quantity Adjustment). If you have an injector replaced at a dealership, the scan tool is used to reprogram the ECU to the correct IQA value for the new injector.
This is primarily an emissions function to remove variance in fuel delivered. The adjustment is small enough that performance isn't really impacted to measurable degree. There are other manufacturing variables that would have a bigger impact on total engine output.
It's called IQA (Injector Quantity Adjustment). If you have an injector replaced at a dealership, the scan tool is used to reprogram the ECU to the correct IQA value for the new injector.
This is primarily an emissions function to remove variance in fuel delivered. The adjustment is small enough that performance isn't really impacted to measurable degree. There are other manufacturing variables that would have a bigger impact on total engine output.
Michael
03-04-2008, 12:30 AM
#166
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Scan Tool?
At the time of manufacturing, each injector is measured for flow rate at a few different points. At each point, an offset is identified, relative to the nominal flow rate. There are a finite number of pre-defines offset "buckets" that each can be grouped into, at each point. These buckets are combined to form an identifier for the injector and turned into a 2D bar code (data matrix). The data matrix is laser etched onto the injector. This is then read at the factory and programmed into the ECU. This information is used as an offset in the nominal calibration to fine tune the amount of fuel delivered (per injector).
It's called IQA (Injector Quantity Adjustment). If you have an injector replaced at a dealership, the scan tool is used to reprogram the ECU to the correct IQA value for the new injector.
This is primarily an emissions function to remove variance in fuel delivered. The adjustment is small enough that performance isn't really impacted to measurable degree. There are other manufacturing variables that would have a bigger impact on total engine output.
It's called IQA (Injector Quantity Adjustment). If you have an injector replaced at a dealership, the scan tool is used to reprogram the ECU to the correct IQA value for the new injector.
This is primarily an emissions function to remove variance in fuel delivered. The adjustment is small enough that performance isn't really impacted to measurable degree. There are other manufacturing variables that would have a bigger impact on total engine output.
03-04-2008, 10:11 AM
#167
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Worth noting is that IQA (in GM product) doesn't have a range of adjustment suitable for changing to aftermarket (bigger) injectors. It really is a fine tuning type of feature.
03-04-2008, 06:23 PM
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Cummins!
On GM product, you only need a Tech2 scan tool. This will let you tweak the IQA values. The problem is knowing what to tweak...the code looks like a random string of letters and numbers.
Worth noting is that IQA (in GM product) doesn't have a range of adjustment suitable for changing to aftermarket (bigger) injectors. It really is a fine tuning type of feature.
Worth noting is that IQA (in GM product) doesn't have a range of adjustment suitable for changing to aftermarket (bigger) injectors. It really is a fine tuning type of feature.
03-04-2008, 09:35 PM
#169
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