jay_rich

iTrader: (8)

OKay just got my wideband in...and its running rich biiig time! Well I get around 250 KM per tank (55-60ish liters)


Okay Temp outside is 61*F today
Car temp was at 180ish
Car timed for N2O

IDLE...14.7:1ish
1500ish-1800 14.7-15.2:1

WOT...drops down to 10.1 then climbs to about 10.9:1 but then after I get off it is leans out to max on the gauge and wont read and the exhuast pops

How can i lean this sucker out a bit??

Jay

Anyways the chart i have in tuner cat (if this is the right one reads

Closed TPS spark advance

RPM Spark Degree
0 0.0
400 28.0
800 28.0
1200 30.0
1600 34.0
2000 34.0
2400 34.0
2800 35.0
3200 37.0
3600 37.0
4000 37.0
4400 37.0
4800 37.0

Mods....
355 LT1
speed pro pistons
Ported intake and heads
1.6 RRs
hooker 1 5/8 headers
3 inch all the way back
NO CATS
52MM BBK
hotcam
30#
aeromotive adjustable FPR
K&N
3000 Stall
Built 4L60e
MOSER 12 bolt 3.73s

onephatZ28

iTrader: (8)

What is you A/F with the N2O on?

Sounds like you just need to get a good dyno tune

jay_rich

iTrader: (8)

I never installed it on the car...it was set up from the truck it was in before and i never got around to changing the timming (since i just got tunercat and dont know how lol )

Also i beleive i have a small exhaust leak just after my Y pipe....(wideband is installed at the end of the Y)

Jay

onephatZ28

iTrader: (8)

Sorry. I over look the part were you said you had tunercat

infinitebird

iTrader: (11)

Assuming you have some way to correlate RPM with the wideband data, you want to modify the %change A/F Ratio at WOT vs RPM table.

Lower numbers result in a leaner mixture.

The generally accepted formula is:
AFR = 14.7 / (1 + (% change WOT vs coolant temp / 100) + (% change at WOT vs RPM/100))

The two %change variables are the values in the two PE tables (coolant temp and RPM). Using this formula with the stock numbers you can see that the targeted a/f on the stock tune is in the low 11s which is around what you were reading (within a margin of error).

You may also find the spreadsheets on this page useful:
http://para.noid.org/~lj/PCM%20Tutorial/PCMtutorial.htm

jay_rich

iTrader: (8)

here is that graph from my pcm

RPM %Change
400 4.7
800 4.7
1200 -0.8
1600 -0.8
2000 -0.8
2400 4.7
2800 4.7
3200 4.7
3600 4.7
4000 4.7
4400 3.1
4800 -0.4
5200 -3.9
5600 -7.8
6000 -7.8
6400 -7.8
6800 -7.8

Jay

infinitebird

iTrader: (11)

ok well that table makes sense from your observed data but, do you understand how to use that formula to get the a/f you want?

jay_rich

iTrader: (8)

No clue still lmao....

Jay

infinitebird

iTrader: (11)

Ok, post your %change coolant temp at wot table also, and I'll give a better explanation.