I'll venmo whoever answers these questions enough money for a case of beer.
I wanna start by saying thanks to anyone who's ever come back to update their thread once they found a solution. Y'all are the best, and the reason I never need to actually make a post. To the people who answer the questions, thank you even more. I've been lurking since 2015. I've tuned various H/C/I, turbo, and blown gen 3 cars, so I'm not entirely useless, but this is my first gen 4 car with a lot of money in it, and I'd really like to not blow it up.
2007 C6 ZO6 E38 - 2 bar OS
12615136 MAP sensor
441ci
Forged Mahle pistons
Frankenstein stock castings
Katech torquer 116 cam
Stock LS7 intake/TB
ARH 2" LT's w/ catless x-pipe
Ti trim w/ 3.4" pulley A&A kit (shooting for ~10lbs in Denver)
FIC 130lb injectors (IS303-1200H)
AEM 400 pump setup similar to an A&A setup. -8AN tee'd into stock line/to rails, -6AN from schrader port to AEM FPR (25-305BK), and back to tank.
FPR is not vacuum/boost referenced (set at 58ish psi with gauge on FPR) stock in tank regulator is functional.
E85
I had this car idling and cruising great last weekend with 42lb injectors as a H/C E85 MAF only car. The only change since then is the 130lb injectors, and there are a few things I honestly don't understand. When it was just H/C I tuned it, and it ran great. Then I did the 2 bar OS update, added the blower and fuel system (not injectors), and while I was waiting on the injectors I figured I'd just go ahead and tune it because essentially what works for 42lb injectors at cruise/idle should work for 130lb injectors if all the injector data is entered correctly. With the blower hooked up I was able to tune MAF/VE from idle up to 4k rpm with no issues, and got everything +/- 1ish%, which I was happy with because I figured there would be some adjustment once I installed the new injectors. I just installed the 130lb injectors, added all the injector data from FIC's spreadsheet, halfed IFR/IVT, and doubled stoich, and when I started it, it was idling around 10.5:1. So just to see if it would make a difference I scaled the injectors in the FIC spreadsheet by 40% in order to actually have valid IFR data up to 592kpa, and multiplied the stoich value by 2.1 (See below thought/explanation for reference), and there was no change from what I can tell. It's still idling around 10.5
I have a few questions:
1. MAP offset/linear in Denver
I get 1.86v at my MAP signal, and 4.99v at the hot. 1.86/4.99=0.37x200=74.55+8.33=83kpa KOEO.
Do I:
a. Set the linear value to 210 as to not have such a high offset value in order to reach 101kpa KOEO?
b. Set the linear value to 200, and have an offset value of 26.45 in order to reach 101kpa KOEO?
c. Does the offset value really even matter? Do you leave linear at 200 no matter what, and adjust offset to reach 101kpa in any condition? I think this is the correct answer, but there's so much conflicting information on here. I trust 200/8.33 are the correct values for this sensor, but I just moved to Denver, so I'm unsure about how to handle the elevation change.
2. Injector scaling
I understand if my FPR is not manifold referenced IFR will need to increase with fuel pressure, but with the 63.5lb/hr limit even with scaling 130lb injectors the higher pressure values require more than 63.5lbs.
a. Do I need to only be concerned with IFR up to the 400kpa value? If I scale these injectors 50% it gives me a flow rate of 66.7lbs at the 400kpa column. Do I just tune out that additional 5% difference at the 400kpa column and above, via MAF/VE?
b. If I scale the injectors 40%, all flow rates up to 592kpa are accurate, and I doubt I'll ever see 86lbs of fuel pressure. But are the higher pressure values there for calculations, and do they need to be linear?
c. If I do scale the injectors by 40% is there a correlation between what the required stoich value should be? i.e. if the recommended method is to half IFR/IVT, and double stoich, would a 60% reduction in IFR require a 110% increase in stoich value? I have room for it. This car was previously tuned for E85, so the stoich was around 9ish to begin with, so technically I could more than triple it if needed.
d. Or am I wrong about all of this, and the procedure is to no matter what simply half IFR/IVT, double stoich, and tune out the differences via MAF/VE?
3. Lastly, this car will not enter closed loop until I drive it. Am I missing something regarding VSS, or RPM to enable closed loop? I swear I've searched, and looked everywhere in the VCM editor, and I can't find anything that seems like it would maintain open loop under 2.5k rpm, or 25mph. This car can warm up to 198* sitting still, and will not enable closed loop until it gets up to ~25mph. I honestly don't know if it's RPM, or speed related. Also, injector tip temp is set to zero, but I still have issues with running rich after flashing.
Sorry for the long post, but like I said, I'm willing to throw whoever's willing to help me out some beer money.
I can post files tomorrow. It's too late to do anything in HOA land.
Thanks.