Boosted 2005 Pontiac GTO Injector Tuning Question

[redmisfitx]

I have a boosted 2005 Pontiac GTO, I bought the Boost District LSA Kit with 850cc/80lb injectors. I am trying to get some sort of baseline in however I can't go above 63.5psi in the injector flow rate vs kpa table. I am really new to this, so I'd appreciate any help! Thanks in advance.

2005 pontiac gto injectors.png

[blindsquirrel]

This'll go a lot better if you post your tune file and the datasheet that comes with the injectors, instead of a screenshot.

But if you don't wanna, then double Stoich, half AFR Term, and half actual IFR.

[redmisfitx]

Hey, thanks for the response, here is the tune file and the injector sheet.

2005_Pontiac_GTO_Cam_Supercharged_Previous.hpt

PXL_20240120_052425254.jpg

[redmisfitx]

Here is the cam info too, not sure if it matters. Car has longtubes, no cats.

Tick Performance

Intake [email protected]
229

Exhaust [email protected]
232

Intake Lift @.50
615

Exhaust Lift @.50
574

Cam lobe Sep Angle
113

[blindsquirrel]

That picture is not the injector data.

https://fuelinjectorclinic.com/image...S_WEBSITE.xlsx

[redmisfitx]

Thanks, like I said I'm kinda new to this. I looked through what came with the injectors, that's all I found.

[blindsquirrel]

Still a returnless fuel system at 58 PSI (stock regulator still in the tank, single feed line), or has it been changed to something else?

Are you going to try to run it with the stock 1-bar OS & 1-bar MAP or are those just yet to be changed?

[redmisfitx]

Yep to all that, has a walbro pump in it now, but all else is stock. Stock OS.

[5FDP]

My opinion is that you install the 2 BAR OS so you can tune for boost.

Delete the MAF sensor or leave it there and just tune it in speed density only. Do the double stoich method for the injectors so you can run those 80's. I'd put in a 2 bar MAP sensor too.

[blindsquirrel]

And don't forget (or if you didn't know), the E40 is very particular about which MAP sensors it will work with. The Linear value can't be more than 256, and Offset cannot be a negative. So no LSA 3-bar sensor for you.

Holley has a LSA/LS3-format (bolt down) sensor they claim is 2.5-bar but they do not know what electronics their Chinese supplier is putting inside them, so they can't give the actual linear/offset specs for it.

[edcmat-l1]

This should be plug n play for that.

https://www.summitracing.com/parts/ado-19418810

[blindsquirrel]

This should be plug n play for that.

https://www.summitracing.com/parts/ado-19418810

Electrically, yes. The LSA manifold uses the late style with the bigger o-ring boss and a single offset hold down bolt. Other than the Holley mystery part, there are only 1-bar or 3-bar versions in that format.

https://www.summitracing.com/parts/ado-213-4760

...or one you make yourself:

LSA 2.5bar.jpg

https://www.digikey.com/en/products/...250A6U/1619109
https://www.adafruit.com/product/1212

[edcmat-l1]

Skipped over the LSA part. Yeah physically that would take the red label sensor.

You could probably double grommet the one I posted and that would fit tight in the hole.

[Alvin]

This should be plug n play for that.

https://www.summitracing.com/parts/ado-19418810

We use this one on LSA E40 cars. We just use a bit of vacuum line to mount it remotely.


fun fact.. even though the later cars will take higher than 256kPa they have a hard shut down at 256kPa. Well maybe not VVE but the custom 2 bar OS's definitely do.

[redmisfitx]

Thanks for all of the information guys, will post an update soon, this helps a lot getting me headed in the right direction.