Hello! A little background regarding my post:

For the past month I have been chasing a misfire, and I have narrowed it down to an injector, ive swapped it and the misfire moves with it. Anyways, the injectors I currently have are deatschwerks 650cc @ 3.5 bar injectors. Deatschwerks now only has a 600cc @3.0 bar injector, so they have offered to replace my 650cc with those.

My dilemma is tweaking my current fuelmap to accomodate these larger injectors. So... I need to figure out how to convert my current fuel map to a basemap for these larger injectors.

How does injector flow rate convert? Is it incorrect to say that a 600cc injector @ 3.0 bar is roughly a 700cc @ 3.5? (200cc per bar * 3.5?)
If that is the case, the new ones will flow about 8% more than the old ones... so could I subtract 8% from my fuel values and tweak from there?

I could be horribly wrong, as the injectors can only flow so much so the conversion cant be that linear...

Please advise.

Thank you!
Aaron

 

from 650 to 600

noo need to, just check ur AFR and retuen it.

 

Yes, I know that... but I would like a somewhat accurate basemap to go off of. Its a 650 @ 3.5bar to 600 @ 3.0, so the 600 is a larger injector.

 

i would just swap and see what it does.

but you could
1. reduce your fuel pressure on your return system.
2. retune all of the fuel cells in your map. they'll be close (richer) but not optimal anymore.
3. if you have a UTEC, you set use the temp correction to do a whole map change

 

Im not sure what you mean by #3, i will swap and see, but im sure it will be pig rich.

 

Oh and yes I do have a utec

 

it wont be pig rich. I dont even think DW changed anything except how they were rated. I'd bet they are the exact same injectors.

 

Well I spoke with Mike from DW and he says they are a different injector.

 

well the above options still stand regardless.

i'd personally just road tune it with some logs. Prolly take an hour.

Or you could rent a dyno for an hour for ~$125 so you dont have to do it on the street.

 

yea i will road tune it, i was just hoping I could get close by just scaling the values by a % first.

 

They are different injectors yes. They are almost the same though. I wouldnt worry too much, your map will be close.

 

Ok, thanks for the help guys.

 

Maybe ill take off 5% off all fuel values and go from there, should be on the safe/rich side.

 

Different injector - Yes
Flow Rate-Same
Retuning-very doubtful

 

Hmmm, good to hear, looks like it wont be much of a change afterall.

Thanks for your help guys.