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Old 09-17-2006, 06:28 AM   #1
STI8U
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Default Injector Phasing

I'm interested in what others have found for the optimal injector phasing/end angles.

I have an Autronic ECU, which allows you to adjust injector end angle in crankshaft degrees based upon load and RPM. Currently my map is set to 380 degrees in low load, low RPM sites, and then transitions to 281 degrees in medium/high load, mid RPM sites and finally to 222 degrees in medium/high load, high RPM sites.

I have read that for best idle, injector end angles should be 300 degrees or less. For best power however I have read that they should be around 580 degrees or so. I'm not sure whether this only applies to normally aspirated cars or also to forced induction cars. Somebody once told be reducing the injector angle was the right thing to do as it gives more time for the fuel to vaporize as RPMs increase...

Any thoughts?
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Old 10-05-2006, 07:04 AM   #2
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Bump...
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Old 10-05-2006, 05:01 PM   #3
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Ah I hate to tell you that injector timing is for idel, emissions and slightly more power at low -3000 rpms. The only thing that really changes is emissions and maybe a slightly better idel but thats it.

I wouldnt bother messing with it. You will not make any more power playing with it because where you are making power the pw is so large you will be squirting against a closed valve. This is because as RPM goes up the valve open time is decreased and injector time open is increased. If you are running 75% dc at 5k more you are going to hit a closed valve and there is nothing you can do.
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Old 10-06-2006, 12:16 AM   #4
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Huge power gains and response will be had by adjusting the phasing. You must use a dyno however. Once the timing is set the AFR can be leaned out across the board. While adjusting this perform the adjustments from 2000 rpm WOT to 4000 or so. Past that in Higher idc it will not have near the effect. Also set the correct Injector dead time settings.

Clark
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Old 10-07-2006, 05:52 PM   #5
STI8U
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Quote:
Originally Posted by AZScoobie View Post
Huge power gains and response will be had by adjusting the phasing. You must use a dyno however. Once the timing is set the AFR can be leaned out across the board. While adjusting this perform the adjustments from 2000 rpm WOT to 4000 or so. Past that in Higher idc it will not have near the effect. Also set the correct Injector dead time settings.

Clark
Cool thanks...
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Old 10-07-2006, 09:17 PM   #6
WhiteKnight
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Clark,

Any tips about calculating the injector phasing ?

How can i know that if i have the right settings ?
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Old 10-08-2006, 05:28 AM   #7
STI8U
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Another query - can you modify injector phasing using ECUTEK/Cobb/OpenECU in the factory ECU?

WhiteKnight - check out this program from the Autronic website, very useful for visualizing injector phasing.
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Old 10-08-2006, 06:24 AM   #8
WhiteKnight
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STI8U,

Thanks for the program,

I have got Hydra ECU and it has only from 0 to 255 degrees for injector phasing.

I have my camshafts detailed spec sheet, if i send you that sheet can you tell me correct settings for my injector phasing map ?

Thanks
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Old 10-09-2006, 06:27 AM   #9
STI8U
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Quote:
Originally Posted by WhiteKnight View Post
STI8U,

Thanks for the program,

I have got Hydra ECU and it has only from 0 to 255 degrees for injector phasing.

I have my camshafts detailed spec sheet, if i send you that sheet can you tell me correct settings for my injector phasing map ?

Thanks
I'm a noob to injector phasing tuning

I can tell you my map is 380 at idle and low load sites/low RPM sites, 281 at medium/high load and low RPM sites and then 222 at high load sites/high RPM sites (4000RPM+).

You'd need to ask Hydra how they do injector phasing - 0 to 255 degrees might be offset or something. Autronic just does it in crankshaft degrees with no offset and you can set the end angle anywhere from 0 to 720
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