Injection Time Calculator for all Haltech ECUs

engineer
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Injection Time Calculator for all Haltech ECUs

Postby engineer » Sat Oct 20, 2007 7:01 am

Hi All,

What I have attached here is a spreadsheet that allows you to calculate with reasonable accuracy the injection time at any particular RPM and load point in the fuel map. All you need to do is type in some very basic values and it will then give you the injection time that your car will need if you are using a Haltech (or other) ECU.

The hardest part as you all know about getting an aftermarket ECU to run properly is to get the tuning right. When you are starting from no base map in your garage for the first time this process of trial and error on the injector time can take a while at the different load points.

This spreadheet will calculate all the pulse width values for you at any load point you desire. However it simplifies the process by allowing you to find a "best fit" between the minimum and maximum load points at a particular RPM value.

The calculator takes all engine characteristics into consideration that you will need engine size, injector size, AFR, pressure, temp etc.

I spent a little bit of time creating this as there is nothing on the web that i could find that would do it..so I made it myself!!

The purpose of the tool is to allow you to create a decent base fuel map very quickly that will then allow the car to be perfectly driveable so that you may then take it to the tune shop for a proper tune. It is no substitute for a dyno tune but I have tried it on my car many times and it works a treat!!

Load it up for fun to see how temp, injector size etc all affect the inejction time..it is interesting!! :)

Any questions let me know!! :)

Cheers
Engineer
Attachments
Injection Time Calculator.zip
Engineer's Injection Time Calculator
(50.23 KiB) Downloaded 5804 times

Cuore Turbo
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Re: Injection Time Calculator for all Haltech ECUs

Postby Cuore Turbo » Thu Nov 01, 2007 6:35 am

Hello, thats an interesting tool.
Very nice.

can you add an three cylinder to the excel file
I run an Daihatsu three cylinder

thxs in advance

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Claudio
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Re: Injection Time Calculator for all Haltech ECUs

Postby Claudio » Sun Nov 04, 2007 9:17 am

Hello, how does this work? it says "read only" so i cant input different values.
Claudio
tuningtechnology@gmail.com
Independant Haltech Sales & Tech Support

engineer
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Re: Injection Time Calculator for all Haltech ECUs

Postby engineer » Mon Nov 05, 2007 9:38 am

Hi Claudio,

You will need to input data in the cells that are coloured yellow only.

The spreadsheet will calculate the rest for you and provide you with a linear fuel map from the min load to max load positions.

The atatched file will give you a demo to look at :)

It should NOT be read only as I have just double checked it.

Let me know if you cannot change the values in the yellow cells as you may have a security issue with Excel which is blocking you from changing the cell values :)

Let me know how it goes :)

Cheers
Engineer
Attachments
injection demo.JPG

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Claudio
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Re: Injection Time Calculator for all Haltech ECUs

Postby Claudio » Mon Nov 05, 2007 11:28 am

Ok, got it, now i get it. One question, is the fuel mode set to sequential according to this calculator? and does it apply for all engine configuration? And finally what does the RPM parameter change? each RPM point in the map?
Claudio
tuningtechnology@gmail.com
Independant Haltech Sales & Tech Support

engineer
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Joined: Sat Oct 20, 2007 6:44 am

Re: Injection Time Calculator for all Haltech ECUs

Postby engineer » Mon Nov 05, 2007 4:55 pm

Hi Claudio,

Yes Sequential is the mode it simulates.

Aslo the RPM value does not change anything actually as the units cancel out in the equations. But it is meant to be each RPM step value in the map :)

What do you mean by does it "apply for all engine configurations?" ? It will do 4, 6 and 8 cyl only at this point as I have not catered for other engines like rotaries.


I hope that helps. let me know how you go :)

Cheers
Engineer

engineer
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Re: Injection Time Calculator for all Haltech ECUs

Postby engineer » Tue Jan 08, 2008 2:29 pm

Hi All,

recently I was asked if the injcection timne calculator will cater for alcohol engines. The short answer is it should do so reasonably well. However the injection pulse width nees to be corrected as alcohol and unleaded have very different A/F ratios. Please see the table below to get a rough guide as to what sort of ratios you should be putting into the calculator if you are running alcohol.

Below is a table of A/F ratio values that compares Gas, alcohol and propane as fuels. You will notice that for each of the driving conditions the A/F ratio is different. Use only the full power values for input to the calculator. With the richer A/F ratios the calculator should adjust the pulse width to get you in the zone for a driveable map so you can get it to the tuner. So pick the A/F you need for your fuel and put it in.

ECONOMY (Coasting) BEST ALL-AROUND (Light throttle) POWER (Full Throttle)

Gasoline 17.1 16.0 15.1 14.7 14.7 14.7 14.7 14.0 13.2 12.1
Alcohol 7.6 7.1 6.7 6.5 6.5 6.5 6.5 6.1 5.8 5.3
Propane 17.9 16.8 15.9 15.6 15.6 15.6 15.6 15.0 14.0 13.0


I hope that helps :)

Cheers
Engineer

HaltechMatt
Haltech Staff
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Re: Injection Time Calculator for all Haltech ECUs

Postby HaltechMatt » Thu Jan 10, 2008 11:31 am

Hello Engineer - I nice calculator, do you assume a VE figure or do you have some sort of dynamic VE calculation your using?

bavbim_760il
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Re: Injection Time Calculator for all Haltech ECUs

Postby bavbim_760il » Sat Jan 12, 2008 1:28 pm

Nice calculator though...
but my car running with a multipoint injection mode..
actually it is 4g92 16V with turbo intercooled engine....
can I input to the calculator...
since My car doesn't have any air temp sensor...
please help me to set the right fuel map and ing map for my spec.
thank for your help.
---------------------------------------------Engine Modifications and ECU Tuning Specialist-----------------------------------------------

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Ignition
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Re: Injection Time Calculator for all Haltech ECUs

Postby Ignition » Sat Jan 12, 2008 9:32 pm

I wish I could work out a scaling from low load desired afr to high load afr throughout the rpm range, to generate a rough 3D table, or even 2D load table.

I need to learn how to work excel more.... this one is an excellent tool already ;)

engineer
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Joined: Sat Oct 20, 2007 6:44 am

Re: Injection Time Calculator for all Haltech ECUs

Postby engineer » Fri Jan 25, 2008 6:41 am

Hi Haltech Matt,

I have a document that has all the calculations that are used by the calculator I will post them up. The VE is not directly entered into the formulas as such. The VE is estimated by the engine factor parameter. It is not super precise but will be close enough to get a very driveable fuel map. As VE differs at each RPM and boost level it is too hard to compensate for it in a simple formula based map calculator so it was not included.

BavBim,

You can still use the calculator if you are using multipoint mode it should still get you a reasonable result for your initial map. If you do not have a temp sensor value from the car simply use a value of 15 deg C over the current ambient temperature. So if its is 20 deg C outside assume 35 deg C for the calculator and it will be close enough.

Hope that helps..

Cheers
Engineer

signature sound
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Re: Injection Time Calculator for all Haltech ECUs

Postby signature sound » Sat Jan 26, 2008 1:43 pm

thats pretty cool. never seen anything like it. i wish i had this when i was mapping my ecu! trial and error sux!

engineer
Posts: 32
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Re: Injection Time Calculator for all Haltech ECUs

Postby engineer » Fri Feb 08, 2008 11:10 pm

Hi Guys,

How is everyone going with the injection time calculator? Has anyone run up a map yet with it? if so let us all know how you went with it, I am very interested in your feedback. :)

Cheers
Engineer

bavbim_760il
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Re: Injection Time Calculator for all Haltech ECUs

Postby bavbim_760il » Sat Feb 09, 2008 5:04 pm

car runs well...
thanx...
it much help....
---------------------------------------------Engine Modifications and ECU Tuning Specialist-----------------------------------------------

Masadno
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Re: Injection Time Calculator for all Haltech ECUs

Postby Masadno » Sun Feb 10, 2008 3:49 am

Hello!

When I change the rpm value, the graph doesn't update.
I guess you are supposed to change the rpm value and enter the calculated values in the map?
Then take the next rev range...

When I change from 1000 to 2000 I get no change in the graph.
I am at the stage where I should be making a base map for my car, and by pure luck I discoverd this gem ;)
Just need to get it working 100%..

Cool calculator ;)

Cheers, Jarle


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