Tuning 160# High Impedence Injectors

[PAT WS6]

After finally dialing in my tune with 80# Siemens injectors im switching to 160#. Stock PCM
Ive heard people having idling issues with a Boost Ref Regulator.

Im running a base fuel pressure of 58 and its ref to climb with boost. What does my Inj Flow rate vs. Kpa need to look like with the 160s? Anyone got a tune file I can look at?

Thanks

[98Camarod]

The IFR should be straight across the board for whatever fuel pressure you are running.

[PAT WS6]

so if my base is 58# of pressure ur saying the table needs to be at 58 across?

[oakley6575]

No, the ifr table needs to be whatever the injector flows at 58psi. My LS3 injectors are rated at 41.7lbs at 58psi. So I set my base pressure to 58psi and then enter 41.7 across the board in the IFR table. Hope that makes sense

[PAT WS6]

sure does. and you just adjust ur ve accordingly?

[PAT WS6]

set my ifr at 40 across the board, have 58 base pressure my ve is 0 out and its still not idling??

[oakley6575]

???? I'm not sure you understand what those tables do. You don't have proper injector data if you think your 160# injectors only flow 40lbs at 58psi.. Also why would you zero out the VE?

You need to post up your tune

[PAT WS6]

got it running alot better here is my tune.
58.8 ifr vs kpa high rpm and load is still being tuned out its pretty rich

[oakley6575]

Where are you coming up with these IFR values?

[PAT WS6]

divide ur flow by 2 and multiply stoich

[oakley6575]

Are you trying to scale the tune?

[PAT WS6]

i thought by lowering the ifr number that scaled ur ve? ive been playing with it and the car starts and drive OKAY but its rather rich up top.....

any advice

[PAT WS6]

no matter what i do to the VE or the IFRvsKPA its still rich

[oakley6575]

When you scale a tune, you need to scale the ENTIRE tune. Not just the IFR. You have to scale all airmass calculation tables

Do you have good injector data? Where did you get the offsets and what is the IFR at 58psi?

[PAT WS6]

195 lbs at 58 psi. im at 43.5 psi right now tho and they flow 160#..


When you say scale what tables does this intale?

I didnt change any of the values for the offset

[oakley6575]

Why are you scaling your tune? Maxed MAF or something else?

You need to get the correct injector data and then work from there. Change the injector offsets, IFR, ect. Then continue by scaling all the IFR and all airmass tables including the VE, MAF, ect.

You can't just scale one part of the tune and expect everyting else to fall into place.

[sarg]

My guess is trying to overcome some hard limit in the ecu. I remember GB talking about it in his video, but would have to go back to try to find it again to quote specifics.

[Sam88gta1]

I imagine he is scaling it to make use of the entire timing table.

What happened to Cj working on your car?

[PAT WS6]

Why are you scaling your tune? Maxed MAF or something else?

You need to get the correct injector data and then work from there. Change the injector offsets, IFR, ect. Then continue by scaling all the IFR and all airmass tables including the VE, MAF, ect.

You can't just scale one part of the tune and expect everyting else to fall into place.

Im running SD tune. NO MAF!
Im trying to tune these high impdence injectors with a factory pcm. When you say scaling, im not sure what all tables this includes. IFR does need to be scaled so the ve can be adjusted accordingly i would say, but i could be wrong. This is just what I was told.

Sam, CJ helps with the car alot he does the fab work on the car. And the tuning is done by me and then jon looks it over/ ends up re-doing the whole tune. What you see attached is done by me. That is NOT Jon's Work.

[PAT WS6]

These are the injectors
http://boschdealer.com/index.php?mai...products_id=47