Determining APS Intake safety - Page 2

***Draco-REX*** · 03-17-2008, 08:19 AM

Quote:

Originally Posted by nhat

i was running up to 109% IDCs after installing my aps cai. with minor maf calibration, my IDCs dropped to 104%. i think with further maf calibration, my IDCs will drop below 100%. this is on stock injectors.

Ok, this makes me wonder. Are you logging your AFRs when your IDCs are this high? Logicly, an IDC of 100% means the injector is open constantly. I don't see how it can possibly go over 100%. So that says to me that the ECU is adding open-time to an already open injector, meaning that it is requesting more fuel but not getting it.

nhat · 03-17-2008, 02:29 PM

Quote:

Originally Posted by Draco-REX

Ok, this makes me wonder. Are you logging your AFRs when your IDCs are this high? Logicly, an IDC of 100% means the injector is open constantly. I don't see how it can possibly go over 100%. So that says to me that the ECU is adding open-time to an already open injector, meaning that it is requesting more fuel but not getting it.

when my IDCs were 108-109%, my AFR was dipping down to 9.3:1

after minor tweaking of the maf table, my AFR got up to 10:1 and IDCs were 104%. once i get it to ~11:1, IDCs should be ~95%. AFRs are measured with my LC-1 installed in the o2 bung on my aps dp.

in other words, i'm leaving a ton of power on the table

xrayvsn · 03-17-2008, 09:22 PM

Quote:

Originally Posted by Hirogen

Sorry WESTI, I don't really have an update. When Cobb released the 1.0.4 software 2 days ago I had 2 hours to spare so I decided to just revert back AGAIN to the stock box until I set my tune date. I'm too paranoid about it and not enjoying my car.

I think this is a wise choice. The best thing is a properly scaled MAF table for the intake, which means a protune unless you have the knowhow and WBO2 sensor to do it yourself.

Removing the snorkus on your stock airbox should give you a similar sound, shouldn't it?

Hirogen · 03-17-2008, 10:17 PM

Oh yeah I had that done days after I bought the car. I have a drop in filter in it right now. The intake is much more vocal, obviously. BTW 1.0.4 is def worth a reflash VERY smooth map all around and boost comes atleast 200 rpm's sooner

03-17-2008, 10:17 PM	#19
Hirogen Junior STI Driver Car: UGM 07 STi Fav Mod: Cobb DP and Stg2 Posts: 158 Join Date: Jan 2007 Trader Rating: (0)	Re: Determining APS Intake safety Oh yeah I had that done days after I bought the car. I have a drop in filter in it right now. The intake is much more vocal, obviously. BTW 1.0.4 is def worth a reflash VERY smooth map all around and boost comes atleast 200 rpm's sooner This ad is not endorsed by this member. Please register or login to hide this ad.