2MCHPWR

iTrader: (10)

sup guys -
got cam installed and think the torque under 3500 is off due to incorrect a/f and/or low timing. Mods:
stock 241 heads
FAST 92mm intake and NW tbody
85mm maf and bigger TSP lid to fit
1 7/8 speed engineering headers and 3" off road Y, stock WS6 cat-back (single on the left)
SSRA

Can you please post up your dyno graph if you have a/f displayed? Can you also say where the 02 sensor was placed? in header bung or in tailpipe? In my attached graph, it was in header bung. I believe its about .4 leaner if done in tailpipe.

I also think mid-range torque at peak torque is off slightly from being too rich by a little bit; I think there are gains to be made there while still being safe.

if you have hptuners, I'd love to see your timing table.

redbird555

iTrader: (14)

Here ya go man this was my old ls6 setup with stock 243's f13 cam and a FAST 102/102. Af was 12.9-13.1 the whole way n the header bung. I agree the af on yours has a weird curve especially down low. Every car is different so I wouldnt just go blindly copying other timing tables ya know.

2MCHPWR

iTrader: (10)

awesome thanks dude.
thats what i wanted to see. i'll try it on dyno and log to make sure. i'm only gonna fudge with the 2000 to 3500 zone as i see you make put in about 3 more degrees. i will try in small steps.

side question - do you adjust a/f ratio by adjusting maf table or PE EQ Ratio? I'm reading conflicting methods.

Exidous

iTrader: (11)

Ideally, you'd want about 12.7-12.8 before and after peak tq and about 12.5-12.6 at peak torque. Notice the hump at 3800 as you pass through 12.8:1. At 3800 you are good. Lower, raise your VE a little, above lower your VE. Near redline you are really close. Maybe .5% off.

Set your PE table for the target I listed above and dial in your VE to make commanded match WB.

You've left a little power on the table running rich. I'll take a look at my laptop at home this evening and see what I can post up. You'll always get a little weird looking graph near throttle tip in. Should stabilize within a couple hundred rpm. Could you also post your PE and VE tables?

1sick_eg

Only use the maf table to calibrate the maf. Use the PE EQ ratio after your maf is dialed in to get your commanded. For example 14.7/12.5 = 1.176

If you aren't hitting your commanded, then your maf needs some more tuning to get it dialed in. I'm assuming you're running a maf only tune? If you're blending, I would start with the ve table and then work over on the maf.

1sick_eg

If you need help calibrating your maf, or need some help in general, send me a pm. I'll help you get it setup.

2MCHPWR

iTrader: (10)

hi guys - thanks again.
Main VE and PE tables attached, as well as 3 logs from the highway, showing commanded AFR. one of the logs is 2nd gear WOT and the other 2 are 3rd gear WOT.

My maf table should be dead on as the car was tuned and it idles great (except cold start stalls it out if i try to move before some temp is built up).

Obviously i'm new to this and just trying to take my combo to the level where I think it should be. I think the peak HP is good and in line with other dyno's I've seen, but I feel the torque is not where it should be (even before cam and intake I was making more torque under 3500).

1sick_eg

Are you running open loop, or just not capturing fuel trims? Can you send me your tune? I'd like to look at a couple of things. In your first post your afr is all over the place. After I take a look, I'd like to see some pulls with maf disabled and maf only, using some histograms.