Injector Flow Testing Data

Information and discussion of EFI hardware and specifications
ejukated
Posts: 424
Joined: Wed Mar 04, 2009 8:52 pm

Re: Injector Flow Testing Data

Post by ejukated »

do you think this is why the deadtime vs bpw table is 0 from factory?
User avatar
The1
Posts: 4688
Joined: Mon Jan 04, 2010 10:23 am

Re: Injector Flow Testing Data

Post by The1 »

shouldn't be zero, all factory cals have there deadtimes.
ejukated
Posts: 424
Joined: Wed Mar 04, 2009 8:52 pm

Re: Injector Flow Testing Data

Post by ejukated »

hmm I might have defined it incorrectly.. will have to check. So the actual offset used for calculation is [cal]+0.5msec?
User avatar
The1
Posts: 4688
Joined: Mon Jan 04, 2010 10:23 am

Re: Injector Flow Testing Data

Post by The1 »

yeh so for example VS V6 S/C has 0.50ms deadtime at 14.40volts in the factory tune, but it's actually 1.00ms as VS-VY code for some reason has 0.50ms built in. So if you get deadtime tables given to you from ID or Bosch or whoever, subtract 0.50ms from each value to use for deadtime tables in VS-VY, as far as i know 808 doesn't have any offset so straight data will be correct.
User avatar
The1
Posts: 4688
Joined: Mon Jan 04, 2010 10:23 am

Re: Injector Flow Testing Data

Post by The1 »

some new gear i scored cheap. HP bench PSU 0-60v 0-10amp and fluke frequency generator.
IMG_0640.JPG
IMG_0640.JPG (118.52 KiB) Viewed 17041 times
I did some deadtime testing on a new sheet ive made up using the new gear to reverify my results.
777-1.jpg
777-1.jpg (201.21 KiB) Viewed 17041 times
777-2.jpg
777-2.jpg (111.35 KiB) Viewed 17041 times
User avatar
The1
Posts: 4688
Joined: Mon Jan 04, 2010 10:23 am

Re: Injector Flow Testing Data

Post by The1 »

Reference line setup on these ones for 3.5bar so you can see how linear they are. looks like i can tickle the low pulse adder table a bit more, pitty the table didn't go up higher to 6ms or so
Attachments
777-flowbench.jpg
777-flowbench.jpg (80.85 KiB) Viewed 17028 times
777-factory.jpg
777-factory.jpg (80.93 KiB) Viewed 17028 times
Xfirez51
Posts: 60
Joined: Sun Apr 07, 2013 12:09 am
cars: 1992 ZR-1

Re: Injector Flow Testing Data

Post by Xfirez51 »

The1,

I found something very similar in the .xdfs of the LT-5 cals. The Inj. Offset v BATT V uses the formula which "doubles" the OFFSET to account for both Opening and Closing times of injector. So the table displays total offset. I ran into this as I tried to tweak those values to accurately represent the ACCEL 21# injectors I am using rather than the stock Bosch. The Injector Offset table for Low PW does not do this.
Unfortunately, ACCEL never published the offsets for the their 150121 injectors altho they do now have values posted for 24# injectors and up.
User avatar
The1
Posts: 4688
Joined: Mon Jan 04, 2010 10:23 am

Re: Injector Flow Testing Data

Post by The1 »

yes VS-VY have a built in 0.5ms delay, so if using any other ecu that has standard "total" figure for battery tables you would have to add 0.5ms, it is a bit of pain but all PCM's and ECU's have there quirks.
User avatar
antus
Site Admin
Posts: 8501
Joined: Sat Feb 28, 2009 8:34 pm
cars: TX Gemini 2L Twincam
TX Gemini SR20 18psi
Datsun 1200 Ute
Subaru Blitzen '06 EZ30 4th gen, 3.0R Spec B
Contact:

Re: Injector Flow Testing Data

Post by antus »

Nice new kit. :D
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
User avatar
The1
Posts: 4688
Joined: Mon Jan 04, 2010 10:23 am

Re: Injector Flow Testing Data

Post by The1 »

it's getting there, it's about where i need it to be now for what my purposes are, obviously there is the consistent urge to tweak more! But i haven't had any time. I do want to grab a coolant temp sensor and fit it into the tank so i can log fuel temperature, also the pump is currently inside the tank, i will mount it external and perhaps make the tank a bit larger. I have been toying around with different ideas to make measuring the fluid more accurate but haven't come up anything solid yet, i am planing on testing one of these.

Chemical ETape liquid level sensor strip.
http://www.milonetech.com/Purchase_eTape.html
Post Reply