SSmokin 01

iTrader: (14)

Has anyone here run into this or know the cause?

https://ls1tech.com/forums/pcm-diagnostics-tuning/113163-anyone-know-what-causes-poor-maf-performance-code-thrown.html

Thanks


All prices are shipped to the lower 48. I have recent pics of most everything.


Induction/fueling
Procharger P1SC(LS1 fbody reverse rotation) head unit (3k miles) ($1000)

Procharger piping, intercoolers, & misc parts/brackets (J-bracket, twin 3.5 intercoolers, hoses & hose clamps, Metal airbox, cruise & air pump re-location bracket, fan shroud w/16" low profile fan) ($600)

Procharger head unit and piping together ($1500)

Ati 3.80 6-rib($45)

Reichard Racing 6-rib 3.80($75)

60lb/hr Mototron's (Just taken off my car since I swapped 75's in)($350)


Valvetrain/Ignition
TR 1" Valve cover spacers (never used) ($230)

(NIB)Comp hi-tech chromoly pushrods (6.950) ($100)

(NIB)TR chromoly pushrods (7.150) ($85)

(NIB) Magnecore spark plug wires(#85241) ($60)


Exhaust
(NIB)Cool It Thermo-tech header wrap 2"x50' ($25)

2 pairs O2 Simms ($50/pair)

1 pair of O2 Extensions ($35)


Wheels/Tires
2 17x9.5 TT II's ( small casting blemish on 1 wheel) ($300)

Pair of 325/50/15 MT ET Street DR's (8 track passes with approx 500 street miles)($250)


Interior/Appearance
Black w/red letters OE SS grill ($200)

1 set of charcoal t-top shades (never used) ($40)

Stock '02 steering wheel w/radio controls & airbag ($100)

Pass side airbag/bracket ($75)


Audio/Computer
Single 12" Custom fiberglass enclosure (Driver side/ sub not included) ($175)

(NIB)Streetwires Musica 200 16ft gold RCA cables ($15)

(NIB)Keyspan USB serial adapter ($35)




PAYMENT:

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Thanks
Preston

MYTURBOT/A

Did you up the maf fail frequency its in the diagnostics tab in edit i`d raise it to atleast 14000mhz. also right next to that there`s another tab the Dtc1514 table it`s calc airflow Gms/cyl vs %tps vs rpm. one of the guys on ls1 tunning told me that this needed to be changed when running FI and was causing my poor performance so i multiplyed the table by 140% and what do you know my idle smoothed out, i stoped getting missfires, the engine started running smoother at WOT, my L-trims fell into place and most importantly the KR that i couldn`t get rid of went away. I never knew that one table could make such a differance but it did. There`s another tab in the same section it`s the p0101 allowed error maybe you could try loosening that up a little also.

SSmokin 01

iTrader: (14)

Thanks for answering my ? on both boards. I'll try it and see what happens.
The weird thing is I never saw this code during the 15k miles the SC was on my 2001 or the 12k miles its been on the 2002.

1dirtyZ

iTrader: (1)

so what you're saying is if i suffer from irratic idle and funky ltrims, i should multiply the whole thing by 140%?
what does that do exactly?

and what has it done to your part throttle characteristics?

thanks

MYTURBOT/A

multiply it by 130-140 depends if your running high boost or low boost and then any figure thats still less then 500 make that figure 500. part throttle smoothed out alot the car stoped nose diving after shifts and the engine don`t feel like it strugles under Part throttle acceleration. the car basicly drives like stock when not in boost, like it`s suppose to. It`s calc airflow vs RPM vs TPS. Don`t know exactly what it does I think it tells the computer how much airflow should be at a given rpm and throttle position when not at WOT. well when running FI obviously your going to be flowing more air at any given RPM and throttle position than a NA stock motor. So it makes sense to adjust this.

1dirtyZ

iTrader: (1)

cool , thanks for the info. i'll give it a try soon.
do you have any idea if it affects WOT a/f ratio?

MYTURBOT/A

I don`t know if it affects WOT i Have not had a chance to get in on a dyno yet, but i think it might richen it up a little not much though. let me know how it turns out for you.

1dirtyZ

iTrader: (1)

i'm just worried about it leaning out at wot.
but as long as it just richens it i guess i'll be ok.

MYTURBOT/A

FWIW my o2s still read the same at WOT.

1dirtyZ

iTrader: (1)

ok , so i finally get a chance to fiddle with edit again.
looking at the table and reading your instructions i'm kinda scared.

you say to multiply everything by 140% and any values under 500 should be changed to 500??
that kinda scares me since some of the values are as small as 35. should i change all of them?
or just focus on a range of values?

NicD

iTrader: (7)

The thing I don't understand about that table (DTC1514) is conflicting info. Those people on that board say to use that table and modify it, however in an f-body it is turned off in the engine diagnostics from the factory. The vette's have it turned on. It technically shouldn't make a difference in the f-bodies because it is turned off by default. I have never modified that table before in forced induction f-bodies and they run perfectly fine.

MYTURBOT/A

Well it`s on in my 98 so maybe theres a differance in years. But i`d start buy multiplying the table by 130% fist and work up from there. And yes any value less then 500 make 500. I know how you feel about being wary of doing this thats why i backed up my file to disk before i made the changes so if it didn`t work i could go back to stock settings. But it did work so no worrys now.

1dirtyZ

iTrader: (1)

500 it is.
i'll see if it makes a difference.

NicD

iTrader: (7)

Wow, your car is the first f-body I have heard of to have the P1514 DTC code turned on from the factory. I have looked at a ton of f-bodies of ALL years and not seen a single one with it enabled, therefore making changes to that table worthless with that code off. All vettes however have it turned on from the factory.

MYTURBOT/A

IMO just because it`s turned off in the diagnostics table don`t always mean that the table is not used. in some cases that just means that it won`t set the SES light. FWIW if you look at the diagnostics all it says is does error set SES and after how many fail cycles does it det the SES.

NicD

iTrader: (7)

All the other codes seem to work that way. If it is turned off, whatever the code corresponding to it doesn't work either. For example, knock sensors, misfire, and AIR all work this way. I have tried changing this table on an f-body with the code off and never seen a change in drivability or performance. Only ones I have seen it have an affect on is a vette. I am assuming it is because the code is turned on, although it could be related to the different programming of a vette for the fly-by-wire throttle design.