Question about Injector Offset Table in LS1-Edit

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Mar 25, 2003 | 08:20 AM

Black LS1 T/A

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From: Raleigh, NC

Question about Injector Offset Table in LS1-Edit

Injector Offset table changes is an area I need to explore.

I bought the new Seimens Deka Hi-Z 55# injectors and, though I observe more fuel delivery, I had to lower Inj Flow Rate values below calculated values for the Injector Size, Test Pressure and Rail Fuel Pressure in order to achieve zero LTFT's at WOT and below zero during cruise and part throttle.

After tuning for non-positive values, it ranges from about -1.6 to -14.0 depending on idle, low throttle cruise or modest %TPA.

I get about -1.6 to 0.0 at around 15% or more throttle.
It varies about -14.5 to -4.5 or so at around 0.6 to, say, 10 %TPA.
At idle, it drifts upward until it reaches about -1.6.

When I tuned it with calculations closer to actual size/tested PSI/Rail FP, this wide range of values just made me bump Inj Flow Rates down further and further keep LTFT's from going positive.

The question:
Is there any intelligent way to go about calculating and adjusting Inj Offset for injectors that are othjer than stock?
I think I understand someone has such an animal for SVO 42's. But, what about a set of injectors like mine?
Could it possibly be better to use such a table as used for the 42's as being at least better than the stock Injector Offset and go from there as an example?

Thanks

Mar 26, 2003 | 12:45 AM

SS00Blue

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Re: Question about Injector Offset Table in LS1-Edit

<blockquote>quote:<hr />Originally posted by Black LS1 T/A:
The question:
Is there any intelligent way to go about calculating and adjusting Inj Offset for injectors that are othjer than stock?
I think I understand someone has such an animal for SVO 42's. But, what about a set of injectors like mine?
Could it possibly be better to use such a table as used for the 42's as being at least better than the stock Injector Offset and go from there as an example?<hr /></blockquote>I believe I may have a spreadsheet for your application. When I get home I'll check, and if I have what you need, I'll forward it to you.

SC-

Mar 26, 2003 | 12:55 AM

Black LS1 T/A

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From: Raleigh, NC

Re: Question about Injector Offset Table in LS1-Edit

<blockquote>quote:<hr />Originally posted by SS00Blue:I believe I may have a spreadsheet for your application. When I get home I'll check, and if I have what you need, I'll forward it to you.

SC- [/QB]<hr /></blockquote>Cool!

michael@mlbuie.com

Thanks!

Mar 26, 2003 | 05:45 AM

SS00Blue

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Re: Question about Injector Offset Table in LS1-Edit

<blockquote>quote:<hr />Originally posted by Black LS1 T/A:
 <blockquote>quote:<hr />Originally posted by SS00Blue:I believe I may have a spreadsheet for your application. When I get home I'll check, and if I have what you need, I'll forward it to you.

SC- <hr /></blockquote>Cool!

michael@mlbuie.com

Thanks! [/QB]<hr /></blockquote>Mike,
My Windows ME took a dump last week and I'm having trouble finding that worksheet. I'm about 90% sure it's the one you want. I'm going to keep looking.

SC-

Mar 26, 2003 | 05:49 PM

Black LS1 T/A

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From: Raleigh, NC

Re: Question about Injector Offset Table in LS1-Edit

Thanks! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I'll keep an eye out for it.

Mar 31, 2003 | 05:49 PM

nevrenuf

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Re: Question about Injector Offset Table in LS1-Edit

I'd love a copy of that too!

tomc5@bellsouth.net

Apr 2, 2003 | 08:24 AM

SS00Blue

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Re: Question about Injector Offset Table in LS1-Edit

<blockquote>quote:<hr />Originally posted by nevrenuf:
 I'd love a copy of that too!

tomc5@bellsouth.net <hr /></blockquote>So would I. Sorry fellas, I've looked everywhere. I just can't find it.
<img border="0" title="" alt="[Frown]" src="gr_sad.gif" />
SC-

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Apr 2, 2003 | 09:46 AM

Black LS1 T/A

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From: Raleigh, NC

Re: Question about Injector Offset Table in LS1-Edit

<blockquote>quote:<hr />Originally posted by SS00Blue:
 <blockquote>quote:<hr />Originally posted by nevrenuf:
 I'd love a copy of that too!

tomc5@bellsouth.net <hr /></blockquote>So would I. Sorry fellas, I've looked everywhere. I just can't find it.
<img border="0" title="" alt="[Frown]" src="gr_sad.gif" />
SC- <hr /></blockquote><img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" /> <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" /> <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" />

Thanks for checking, though. <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />

Apr 4, 2003 | 08:56 PM

Ragtop 99

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Re: Question about Injector Offset Table in LS1-Edit

tomc5@bellsouth.net
michael@mlbuie.com

I assume you are looking for Chris B's injector offset.XLS model. It's in your inbox. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

You guys can ship it to others that ask for it.

Apr 5, 2003 | 05:06 AM

#10

Black LS1 T/A

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From: Raleigh, NC

Re: Question about Injector Offset Table in LS1-Edit

Thank you very much. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I'm not sure if I will or even should use it, but I want to try to understand it.

I've been told by a tuner not to do it unless it is verifiable that the injector I use needs that specific offset, or I risk damaging the injectors
over time and even worsening the tune. I can see how that is true without him telling me that.

But, I want to see how it works.

Thanks, again!

Apr 6, 2003 | 10:19 AM

#11

SS00Blue

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Re: Question about Injector Offset Table in LS1-Edit

<blockquote>quote:<hr />Originally posted by Ragtop 99:
I assume you are looking for Chris B's injector offset.XLS model. It's in your inbox. <hr /></blockquote>That's the one! I know'd it was somewhere out thar...

SC-

Apr 9, 2003 | 06:05 PM

#12

Phate

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Re: Question about Injector Offset Table in LS1-Edit

Can I get a copy of this?

scott.allen@earthlink.net

Thanks,

Scott

Apr 9, 2003 | 08:44 PM

#13

parish8

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From: omaha ne

Re: Question about Injector Offset Table in LS1-Edit

can i get a copy too, i would like to see it.

cobra99vert@aol.com

thanks

Apr 9, 2003 | 10:52 PM

#14

JNorris

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From: Montgomery, AL

Re: Question about Injector Offset Table in LS1-Edit

Please send me a copy as well.

Thanks

John

jnorris404@aol.com

Apr 10, 2003 | 10:11 AM

#15

RedHawkWS6

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From: Fayetteville, NC

Re: Question about Injector Offset Table in LS1-Edit

another one for a copy

hawkinke@soc.mil

Apr 10, 2003 | 05:36 PM

#16

red ws6 99

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From: Las Cruces, NM

Re: Question about Injector Offset Table in LS1-Edit

you can get the file from http://ls1edit.slowcar.net/

But it does you no good unless you have the ford or whatever company made the injectors offset file. Even then it won't be exact

Gary

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