Injection Time Calculator for all Haltech ECUs
Re: Injection Time Calculator for all Haltech ECUs
when you use this calc it gives you a Min and Max value for the calculated AFR you want...
Am I supposed to enter this Min and Max to every RPM range? such as doing alt+r for all ranges... setting the min and max, then highlight the bars and do alt+L to linearized the range?
or am I supposed to be calculating different AFR's to go in different graph areas
Am I supposed to enter this Min and Max to every RPM range? such as doing alt+r for all ranges... setting the min and max, then highlight the bars and do alt+L to linearized the range?
or am I supposed to be calculating different AFR's to go in different graph areas
Re: Injection Time Calculator for all Haltech ECUs
Hi CHamp,
Use the min and max values as the endpoints of the lineraisation function. Essentially use the values to define the fuel curve slope across all the load points.
You do not need to do it for each rpm range as the formulas will give you the same min and max value irrespective of RPM.
Cheers
Engineer
Use the min and max values as the endpoints of the lineraisation function. Essentially use the values to define the fuel curve slope across all the load points.
You do not need to do it for each rpm range as the formulas will give you the same min and max value irrespective of RPM.
Cheers
Engineer
Re: Injection Time Calculator for all Haltech ECUs
I know the calculator gives the same result for all RPM ranges
What i was meaning was in halwin, should the min/max be entered for each RPM page of the 2D display?
What i was meaning was in halwin, should the min/max be entered for each RPM page of the 2D display?
Re: Injection Time Calculator for all Haltech ECUs
engineer wrote:Hi,
I will look into your file as the calculated vs real values are miles apart. I will get back to you as soon as I have found something
Cheers
Engineer
Hi Engineer,
Did you have the time to check my issue?
Also, how well wil the calc work on a V8installation? Full seq. inj..
Best regards,
Eivind
BMW E36 325i turbo  E11v2
350rwhp  440nm
350rwhp  440nm
Re: Injection Time Calculator for all Haltech ECUs
Anybody else running a 6 or 8cyl willing to run a comparison on their tuned map vs. calculated and post in this tread?
BMW E36 325i turbo  E11v2
350rwhp  440nm
350rwhp  440nm
Re: Injection Time Calculator for all Haltech ECUs
I dont know if im doing something wrong, but when I enter my specs in the calc it suggests ~2x the injection time i have
2000cc engine with stock (mild) cam and stock 187cc injectors, target AFR 13.5. It suggests 5.7  19.3ms injection time and (70  0kPa).
I set injection type to Sequential, then input the above values for All ranges and swap back to batch injection so the box recalculate the injection times.
The problem is that with those values its so rich that it wont even start, and if i get it to start by altering the 0/500rpm range it will have a AFR on ~910 on idle...
2000cc engine with stock (mild) cam and stock 187cc injectors, target AFR 13.5. It suggests 5.7  19.3ms injection time and (70  0kPa).
I set injection type to Sequential, then input the above values for All ranges and swap back to batch injection so the box recalculate the injection times.
The problem is that with those values its so rich that it wont even start, and if i get it to start by altering the 0/500rpm range it will have a AFR on ~910 on idle...
Re: Injection Time Calculator for all Haltech ECUs
Hi,
Are you sure your injectors are 187 cc/min ? They may not be if its running too rich on the calculated values.
Also the calc was optimised for 4 cyl turbo cars. I did not have much time to work on the 3,5,6,8 cyl motors in much detail so therefore the accuracy may not be there.
Cheers
Engineer
Are you sure your injectors are 187 cc/min ? They may not be if its running too rich on the calculated values.
Also the calc was optimised for 4 cyl turbo cars. I did not have much time to work on the 3,5,6,8 cyl motors in much detail so therefore the accuracy may not be there.
Cheers
Engineer
Re: Injection Time Calculator for all Haltech ECUs
Hi Vipe84,
I have found the issue. The Engine factor rating for the 6 cyl engine is incorrect in the formulas.
I would advise to use the engine factor of "2" and you should then get a good result. I did not have at the time enough real 6 cyl maps to use to get the engine factor right for the 6 cyl engines. I was going to make it a drop down box instead of entering a value in to the calc manually but just ran out of time..plus I did not have a 6 cyl car..so it did not concern me much
Anyway try engine factor of 2 and you should get a close answer to your real map..very close actually... see attchment
Cheers
Engineer
I have found the issue. The Engine factor rating for the 6 cyl engine is incorrect in the formulas.
I would advise to use the engine factor of "2" and you should then get a good result. I did not have at the time enough real 6 cyl maps to use to get the engine factor right for the 6 cyl engines. I was going to make it a drop down box instead of entering a value in to the calc manually but just ran out of time..plus I did not have a 6 cyl car..so it did not concern me much
Anyway try engine factor of 2 and you should get a close answer to your real map..very close actually... see attchment
Cheers
Engineer
Re: Injection Time Calculator for all Haltech ECUs
Hi engineer,
Thanks for your time and answer, awesome!
How well does the calc work for a V8 simulation, should I use a different engine factor?
Thanks for your time and answer, awesome!
How well does the calc work for a V8 simulation, should I use a different engine factor?
BMW E36 325i turbo  E11v2
350rwhp  440nm
350rwhp  440nm
Re: Injection Time Calculator for all Haltech ECUs
Hi Vipe84,
The v8 simulation will work just the same asd the others as the equations are pressure and volumtric efficiency based, so engine config is not that relevant. However the critical factor here is the engine factor value. I will need some actual v8 maps that are tuned right and then i can look at the engine factor value that will work best in the equations to get you the right result.
Similar to what you sent me for the 6 cyl car. The more maps I have the closer I can get the engine factor for the v8 engines.
Cheers
Engineer
The v8 simulation will work just the same asd the others as the equations are pressure and volumtric efficiency based, so engine config is not that relevant. However the critical factor here is the engine factor value. I will need some actual v8 maps that are tuned right and then i can look at the engine factor value that will work best in the equations to get you the right result.
Similar to what you sent me for the 6 cyl car. The more maps I have the closer I can get the engine factor for the v8 engines.
Cheers
Engineer
Re: Injection Time Calculator for all Haltech ECUs
Hi All,
As per a few requests I have now created a newer version of the calculator V2.0
Changes are:
1) SI Units can now be used exclusively
2) Engine Factor for 6 Cyl cars has been corrected
The calculator should now be accurate for 4 and 6 cyl cars. Please post up some good properly tuned maps for 8 cyl, 5 cyl etc and i will create the right engine factor for them and include them into the calculator too for ease of use.
Enjoy !
Cheers
Engineer
p.s for those that have benefitted from the tool over the last 5 years and wish to make a donation (no obligation of course ) to the developer (me!) please do so by paypal at [email protected] .
Be cool..
Cheers
Engineer
As per a few requests I have now created a newer version of the calculator V2.0
Changes are:
1) SI Units can now be used exclusively
2) Engine Factor for 6 Cyl cars has been corrected
The calculator should now be accurate for 4 and 6 cyl cars. Please post up some good properly tuned maps for 8 cyl, 5 cyl etc and i will create the right engine factor for them and include them into the calculator too for ease of use.
Enjoy !
Cheers
Engineer
p.s for those that have benefitted from the tool over the last 5 years and wish to make a donation (no obligation of course ) to the developer (me!) please do so by paypal at [email protected] .
Be cool..
Cheers
Engineer
 Attachments

 Injection Time Calculator V2.0.xls
 (98 KiB) Downloaded 418 times
Re: Injection Time Calculator for all Haltech ECUs
engineer wrote:Hi All,
As per a few requests I have now created a newer version of the calculator V2.0
Changes are:
1) SI Units can now be used exclusively
2) Engine Factor for 6 Cyl cars has been corrected
You rock!
Re: Injection Time Calculator for all Haltech ECUs
Hi Engineer,
You wouldn't have one of these based on throttle position as the load? If not, no biggy, i'll try and come up with something myself.
Cheers
plohl
You wouldn't have one of these based on throttle position as the load? If not, no biggy, i'll try and come up with something myself.
Cheers
plohl
Cheers, plohl
Re: Injection Time Calculator for all Haltech ECUs
Hi Dude,
No Throttle position load is not possible as the formulas are pressure based. Sorry
if you make something up..let us know
Cheers
E
No Throttle position load is not possible as the formulas are pressure based. Sorry
if you make something up..let us know
Cheers
E
Re: Injection Time Calculator for all Haltech ECUs
Hi Engineer,
does this calculator also applicable for "batch" fuel mode?
does this calculator also applicable for "batch" fuel mode?
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