Injector Dynamics "ID 850" Help!!! Question...

These injectors are 80lb injectors and I knew I had to scale the tune in order to make them work... I took my time and scaled everything that i thought needed to be scaled and did it by 50%.
And no matter what I did, the motor would flood while cranking!!! The pressure was at 58psi, I had good voltage and spark...new spark plugs and injectors were wired correctly. If I disconnected fuel pump relay, motor would fire right up and idle for 1-2 minutes with no fuel pressure!!!
I worked on that motor for 6 hours and could not figure out what was happening so I gave up... :frown:
So this morning with a nice big cup of coffee I started to go thru the whole tune and found one really big mistake. I thought I had my units in grams/second and I actually had them in lb's/hour. My question is would this cause massive overflooding even though I accidentally had 6lb injectors in the Tune instead of 40lb injector's???


HAD---- NEEDED
6.198--- 49.190000
6.237--- 49.500000
6.275--- 49.800000
6.313--- 50.100000
6.350--- 50.400000
6.387--- 50.690000
6.423--- 50.980000
6.459--- 51.260000
6.494--- 51.540000
6.529--- 51.820000
6.564--- 52.090000
6.598--- 52.370000
6.632--- 52.630000
6.666--- 52.900000
6.699--- 53.170000
6.732--- 53.430000
6.766--- 53.690000

YES. If the ECU thinks that the injector is only flowing at a rate of 6lb/hr, then it will need that much more on-time in order to deliver the target fuel mass. This new (longer) pulsewidth that accommodates the supposedly low flow rate actually delivers a LOT of fuel when you have ID850's in there...

Alrighty, I still can't believe I messed that up...:-D

You will need to change your oil before running your engine again...

BTW, Injector Dynamics have excellent support for EFILive in their data page. They provide an Excel spread sheet with all the required table data to suit their injectors. It makes tuning very easy when you don;t need to guess a lot of the settings.

Simon,

Quote:

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Originally Posted by swingtan

BTW, Injector Dynamics have excellent support for EFILive in their data page. They provide an Excel spread sheet with all the required table data to suit their injectors. It makes tuning very easy when you don;t need to guess a lot of the settings.

Simon,

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I agree, it's just that when I copied and pasted the Injector Flow rate from the ID spreadsheet I went directly to the gram's/second column not realizing I had my tune file in lb's/hour....:doh2:

If I scaled the tune by 50% and I'm working on my VE table, when I'm doing the copy-paste and multiply, Do I have to do that by 50% also???

I'm assuming this is for the Auto VE process? If so, then the adjustments should be 1:1. This is because you are referencing MAP and RPM, neither of which have been scaled. You still want to get the VE "correct" for the scaled injector settings, so the correction factor does not change. So a normal paste and multiply process, don't reduce the correction factor.

Simon