1fastWS6

iTrader: (3)

I've searched all over and can't seem to find a table or anything to change mine for the new injectors. I'm way rich at idle after swapping injectors and I'm thinking it's because of the offset difference of the 30's.

Can anyone help me here?

Thanks,
Craig

Billiumss

iTrader: (11)

I have the same injectors. Mutiply your IFR table by 110%. Your Ltrims should be close to 0 - -8 which is what you want.

Do the whole table, the numbers will increase to 'lean' it out...

Don't be surprised if your WOT A/F is off after the injector change....

1fastWS6

iTrader: (3)

Injector OFFSET....not injector flow rate. I've already corrected the IFR table.

Anyone?

MyLS1Hauls

iTrader: (2)

I believe the offset is so close to stock that changing it will have little to no effect. My buddy has C5R injectors in his car and we messed with the offset and noticed no difference...I got the offset numbers directly from Bosch. I can't remember the tuner/member from last year that I was talking to about this...

NicD

iTrader: (7)

Don't bother changing the offset for ford 30# red tops.

1fastWS6

iTrader: (3)

Hmmm, I was hoping that was the reason I went so rich again after adding the injectors and new cam. It wasn't nearly as bad with the TR224. I'll try lowering the VE some more and see if that helps. The new cam doesn't have that much more overlap, but who knows.

MyLS1Hauls

iTrader: (2)

Did you get the IFR set correctly? Bigger injectors do have a problem metering small amounts of fuel, but those really arent that big.

AgentOrange

Well SVO 30#'ers are 36#'ers on LS1s. Once installed I had a very unstable idle and the engine would really start to bog when at WOT. I made the proper offset and it made a world of difference so I'll have to strongly disagree with you. Otherwise your trying to mask issues if your injector offsets are not correct and you try and adjust other tables to lean out your engine.

Here is my current table with HPTuners:

4.60 4.62 4.65 4.69 4.71 4.74 4.76 4.79 4.83 4.84 4.88 4.90 4.93 4.95 4.98 5.02 5.03

Hope it helps.

monodax

What you posted is about inline with what I have seen as well. They supposedly flow about 38% over stock on the 99's.

Here is some LS1 Edit data that I found posted on another thread. I am not sure what model it was from but it does show the constants to be alot more than 110% more than stock.

4.24 4.26 4.28 4.32 4.34 4.37 4.39 4.42 4.45 4.46 4.50 4.52 4.55 4.57 4.60 4.63 4.64


BTW, How did you derive your numbers did you just scale them by 1.38 or 1.40?

AgentOrange

I'm using the excel spreadsheet that was being hosted on the Idaho~something or other page (sorry to the author if he's reading this but I forgot). Considering my stock injectors were 28.8 @ 58psi and the SVO's are 30 @ 39psi (actually 39.15) comes out to be a 127% (36.58 @ 58psi). Then you just multiply the stock values by 127%. Are should be the same yet they aren't. The two programs probably have different multipliers.

Either way a 27% increase in fuel delivery is too much to ignore....thus is why I never listen to one individual on the internet, always get a group consensis.

AgentOrange

Oh to calculate the difference is:

New Inj Value = ( (Current Rail Pressure)^2 / (New Inj. Rated Rail Press)^2 ) x New Injector Factory Rating

% Change = new/old or shall we say (New Inj. lb/hr) / (Old Inj. lb/hr)

ie - New Inj Value For SVO's @ LS1 psi = [(LS1 psi)^2 / (SVO rated psi)^2 ] x SVO Rated Lb/hr.

gives us

New Inj Value For SVO's @ LS1 psi = [(58 psi)^2 / (39.15 psi)^2 ] x 30 Lb/hr

New Inj Value For SVO's @ LS1 psi = 36.51 lb/hr

% Change = (36.51 lb/hr) / (28.8 lb/hr) = 126.8 % difference

Please correct me if anything here is wrong guys so we don't have a bunch of people using bunk equations.

monodax

The equation you posted supports the information that I found also. If you input my 99 injector size of 26.6lb/hr / 36.51lb/hr you get a 138% (Rounded Up) difference which is a 38% increase.

1fastWS6

iTrader: (3)

That is the injector flow rate table correct? I multiplied my entire IFR table by 127% when I installed the injectors to compensate for the flow rate increase. My Ltrims are slightly on the negative side. No problems here.

However, I'm looking for the injector OFFSETS to compensate for the slower reaction time of the BOSCH injectors versus the faster Delphi injectors.

I'm thinking I'm just going to leave them alone since no one apparently is messing with these.

MyLS1Hauls

iTrader: (2)

Guys, there is a difference between the IFR and the injector offset. Obviously you need to adjust the flow rate with new injectors...thats a given...but the offset adjusts for the speed at which an injector responds to an open command. Some are slower than others and need to be commanded on a little earlier so it fires at exactly the right time. I was just stating that the SVO 30s have a similar response time to the stockers and adjusting the offset does very little.

NicD

iTrader: (7)

I said no need to change injector offset, not injector flow rate. Big difference. Changing injector flow rate is a given.

AgentOrange

I was mistaken with the original question....sorry for that.

00SS4780

iTrader: (3)

Here look at this. It helped mine and is back to normal now.


https://ls1tech.com/forums/pcm-diagnostics-tuning/195527-tuning-svo-30-injectors.html

1fastWS6

iTrader: (3)

Would it make sense to lower the IFR in the low rpm range to lean it out a bit at idle?

I don't recall if the table is flow rate vs. rpm or vs. MAP or what though.

JNorris

iTrader: (4)

The table is flow rate vs MAP. If you wanted to change the IFR at idle you would change (make higher) the values to the far right.

1fastWS6

iTrader: (3)

Hmmm. Guess I could see what the MAP is at idle and just raise that cell a bit too.

Thanks, I might try that tonite.