Seabee1993

So it's been a while, I own a 2000 GT, I've installed, O/R Mac Pro Chamber, FM Super 44's, #24 FRPP injectors, 75MM TF TB/C&L Plenum, new MC platinum plugs, new boots on the coils. Flashed the PCM with Delta Force software I got thru CliffyK. (With the tune he used to use on his '03)
Car runs fine overall, however at cold start when I try to drive off like it's getting too much fuel and bogs when the gas is pressed for 2-3 seconds. After driving for a min or two and the car warms up all is fine. One person locally has told me to get a MAF that's calibrated to #24 inj, another has told me to install an O2 wideband and modulate the AFR.
Which is the best route to take? Either way will get me a trip to the dyno right?
Thanks for your suggestions gents.

cliffyk

You do NOT need a "calibrated" MAF and anyone that told you that has no clue as to what they are talking about, read more about that here.

The wideband O2 system is a good suggestion for any modded engine, however I would also check your O2 sensors to make sure they are behaving as intended--it sounds as though they are not warming up as fast as they should. Are they OEM or OEM equivalent devices?

The stock O2 sensors have 3.3 Ω heaters (as opposed to the more common 6.0 Ω heaters), controlled by the PCM, and heat up quite quickly because of that. If the O2 sensors were replaced with non-OEM equal units the engine would be have just as you describe...

Seabee1993

Hi, Cliff, I didn't know if you were out of the woods yet. Glad to see you are still with it, and able to answer these postings.
The O2's are the stock units as far as I can tell, you've been with me almost the entire time of owning this car. So, I can't vouch for their age, I can tell they are OEM though.

cliffyk

I am off and on lately, still kicking though...

A wideband O2 system would let you know exactly when, after starting the engine cold, the PCM switched to closed loop mode--the AFR will start to swing back and forth from 14.2 to 15.0:1 or so when the sensors heat up and closed loop operation kicks in. This should happen within 30 to 45 seconds of starting the engine--1 minute tops except in VERY cold climates, even then more than 2 minutes would indicate a problem...

If not the sensor heaters are dead/dying, or perhaps not getting power...

CalBoy101

Cliff, can you recommend one of the wide band AFR meters/loggers?

I was looking hard at Innovates LM-2, I like how it included logging with a PC interface and program but there's a lot of bad reviews from users that had trouble with it. It does the logging by connecting to the OBD2 port and that seems like it acts flakey for a lot of users.

Its there one you used and liked?

cliffyk

Most of the "bad press" the LM-2 gets is from LM-1 users who do not understand that data gathered from the OBD2 port is not as accurate or reliable as that obtained right from the "horse's mouth". They are comparing it to the older LM-1 device that offered wideband O2, rpm, and 4 additional 0-5 V analog inputs--no OBD2. The LM-2 had some teething problems when introduced years ago, but it's a good tool.

For just wideband O2 the Innovate LC-1 is a good choice.

On our cars the available OBD2 data is not really worth a whole lot from a performance tuning perspective. If you want to see/log OBD2 dsta get one of the cheap blutooth ELM327 clones from eBay or Amazon, and one ofthe free (or cheap) smartphone/tablet apps (I use one called Torque on my Android tablet.