AFRs at WOT stock chip???

[autoaddictions]

I was just wondering what kind of AFRs others are seeing on a otherwise stock engine with a stock chip or ATR pit bull chip at WOT 15 pounds of boost. My Syclone seems very lean around 13.5. It dosent seem right to me.

[TYTILIDIE]

I see about 12.5

[sytyguy]

13.5 is piston-death-city......hell 12.5 can be too. I haven't checked the AFR on a stocker in a while, but I aim for 10.8-11.2 on almost all the ones I tune. I get faster spool up when I'm in the mid 11's at low boost. Usually, it's something like this:

PSI - AFR
-------------
01 - 11.8
02 - 11.8
03 - 11.5
04 - 11.5
05 - 11.3
06 - 11.3
07 - 11.2
08 - 11.2
09 - 11.0
10 - 11.0
11 - 11.0
12 - 10.9
13 - 10.9
14 - 10.8
15 - 10.8

Obviously, I'll tweak for that day's particular BARO and TEMP but for the most part, these are pretty safe AFRs that I shoot for. Might lean WOT in the low 11's sometimes and might fatten up to mid 10's sometimes. Just depends. What kind of KR are you seeing with those tunes? If you're seeing little to no KR and the truck feels strong, then you might have a fault sensor. If that AFR is correct and you're getting no KR, you might have a faulty knock sensor.

[WyoSyclone]

Originally Posted by sytyguy

13.5 is piston-death-city......hell 12.5 can be too. I haven't checked the AFR on a stocker in a while, but I aim for 10.8-11.2 on almost all the ones I tune. I get faster spool up when I'm in the mid 11's at low boost. Usually, it's something like this:

PSI - AFR
-------------
01 - 11.8
02 - 11.8
03 - 11.5
04 - 11.5
05 - 11.3
06 - 11.3
07 - 11.2
08 - 11.2
09 - 11.0
10 - 11.0
11 - 11.0
12 - 10.9
13 - 10.9
14 - 10.8
15 - 10.8

Obviously, I'll tweak for that day's particular BARO and TEMP but for the most part, these are pretty safe AFRs that I shoot for. Might lean WOT in the low 11's sometimes and might fatten up to mid 10's sometimes. Just depends. What kind of KR are you seeing with those tunes? If you're seeing little to no KR and the truck feels strong, then you might have a fault sensor. If that AFR is correct and you're getting no KR, you might have a faulty knock sensor.

Thanks for listing those Michael. I know you have a ton of experience and I appreciate getting a peek into your tuning 'book'.

[turbodig]

Hood's numbers are very similar to what I end up shooting for as well. I run 'em a bit leaner 0-5 psi, but that could be simply a difference in the gas types north to south.

We did some wide-band datalogging with an NTK meter in '97 on a pure stock truck, will have to see if I can dig up the data on it. Seems like the WOT AFR was in the mid-high 11s, if I remember right.

[sytyguy]

Originally Posted by WyoSyclone

Thanks for listing those Michael. I know you have a ton of experience and I appreciate getting a peek into your tuning 'book'.

Anytime. You know as well as anyone that those #s listed are guidelines and that each truck/tune is different, so YMMV. Also, keep in mind that I'm at 6m (~20 feet) elevation, so things that jive for me might not for those at higher elevation.

[sytyguy]

Originally Posted by turbodig

Hood's numbers are very similar to what I end up shooting for as well. I run 'em a bit leaner 0-5 psi, but that could be simply a difference in the gas types north to south.

We did some wide-band datalogging with an NTK meter in '97 on a pure stock truck, will have to see if I can dig up the data on it. Seems like the WOT AFR was in the mid-high 11s, if I remember right.

Just found my notes on a BBZB Ty from 2004:

WOT = ~ 15 psi = 11.6-11.9 AFR from 3200-4400 rpm
IATs were 71 degF at start to 113 degF at finish (cold night with EGR disabled).
KR was 1.2 deg as boost approached 15 psi and 0.0 deg through remainder of run (cold night).
Didn't record spark advance.

[autoaddictions]

Ok guys im a Big Gun so i know how to tune.LOL!! My question is more of a stock truck question.. Thers no tuning to be done here its a bone stock truck. I just didnt think a stock chip would run so lean at WOT. Now i will ask again. Does anybody have a wideband on there stock truck with a stock chip or ATR pit bull chip. And if you do, what does your AFrs look like at WOT with Premium gas in the tank. Mine is 13.5:1. I reallize thats lean. My typhoon is 11.8:1 at 30psi. Im thinking a bad fuel pump or bad injectors. i replaced the fuel pressure reg and set fuel pressure to stock. Funny thing is it runs good but it knocks alot and its pulling way to much timing. Race gas did nothing to fix the problem. Im stumped. Mabey i should put a FP gauge in and see if FP is dropping off.

[WyoSyclone]

Hey Frank, by coincidence I got a DM run from new member 'tsgeoman' today, who has a great running, all stock truck. His WOT shows 12.9 at the onset of first gear and tapers down to 12.1... zero knock - averaging around 13 degrees of advance throughout the run. Let me know if you want the file - I can email it to you.
EDIT... but, his is a Ty, not a Sy

[autoaddictions]

Originally Posted by WyoSyclone

Hey Frank, by coincidence I got a DM run from new member 'tsgeoman' today, who has a great running, all stock truck. His WOT shows 12.9 at the onset of first gear and tapers down to 12.1... zero knock - averaging around 13 degrees of advance throughout the run. Let me know if you want the file - I can email it to you.
EDIT... but, his is a Ty, not a Sy

Theres got to be something wrong. this thing is pulling 12* of timing. And my wide band is at 13.9 :1 . My computer is pulling all the timing and the truck is a pig on the boost. Off boost it runs perfectly normal. I might have to record a Dm and post it. Funny thing is i dont hear any detonation...

[WyoSyclone]

Originally Posted by autoaddictions

Theres got to be something wrong. this thing is pulling 12* of timing. And my wide band is at 13.9 :1 . My computer is pulling all the timing and the truck is a pig on the boost. Off boost it runs perfectly normal. I might have to record a Dm and post it. Funny thing is i dont hear any detonation...

Well, spark or fuel, I guess. Have you pulled the coil wire to see what color the spark is? Could easily be a bad pump... have you checked the FP while boosting?

[It's just a six]

I know that when I had a street Pitbul chip & a stock (10,000 mile) fuel pump,my narrow band O2 reader would go off the scale (lean) during the top of each gears RPM.
I put the 255 HP pump & it stayed full rich about 12.0-12.5 range,but that was when I just was using a narrow band reader.
The Pitbull street chip was always rich & therefore pretty safe rich chip.

[Phil O' Dendron]

Originally Posted by autoaddictions

Now i will ask again. Does anybody have a wideband on there stock truck with a stock chip or ATR pit bull chip. And if you do, what does your AFrs look like at WOT with Premium gas in the tank.

I have got a bone stock syclone and ordered an Innnovate LC-1 wideband o2 kit today, will post results as it is installed and I had a datamaster run with it.