DriveATransAm

so my auto-tap came today <img src="images/icons/smile.gif" border="0">

threw it on, and wasnt really sure what i should look for <img src="images/icons/grin.gif" border="0">

apparently i am getting NO knock retard. I ran a log, but my screensave fudged it up half way, so ill check it out later.

what kinda setting should i look for, and what in general should i look at? thanks <img src="images/icons/smile.gif" border="0">

Nine Ball

iTrader: (38)

I've always preferred the DOS-based version myself, not really the Windows version.

Look for the items list of things to monitor and select:

B1S1 O2 sensor (left front O2)
B2S1 O2 sensor (right front O2)
Ignition Timing
Engine speed (rpm)
Knock Retard
Engine coolant temp
Long-Term Fuel Trim B1
Long-Term Fuel Trim B2
Throttle Position (shows in %)

So, get those on one screen and go log some wide-open-throttle runs. Those are the only ones that are worth anything (100% throttle).

You basically want to get:

0 degrees KR
O2 readings in the 0.890-0.900 range
28+ degrees total timing
Engine coolant below 190F
LTrims close to 0 as possible

Hope that helps!
Tony

ExtremeZ28

[quote]Originally posted by Nine Ball:
<strong>I've always preferred the DOS-based version myself, not really the Windows version.

Look for the items list of things to monitor and select:

B1S1 O2 sensor (left front O2)
B2S1 O2 sensor (right front O2)
Ignition Timing
Engine speed (rpm)
Knock Retard
Engine coolant temp
Long-Term Fuel Trim B1
Long-Term Fuel Trim B2
Throttle Position (shows in %)

So, get those on one screen and go log some wide-open-throttle runs. Those are the only ones that are worth anything (100% throttle).

You basically want to get:

0 degrees KR
O2 readings in the 0.890-0.900 range
28+ degrees total timing
Engine coolant below 190F
LTrims close to 0 as possible

Hope that helps!
Tony</strong><hr></blockquote>

awesome! you kind of answered the other question that i had in my post in this post woo <img src="images/icons/grin.gif" border="0">

DriveATransAm

cool, thanks <img src="images/icons/smile.gif" border="0">

ill put those in and see what i come up with tomorrow <img src="images/icons/smile.gif" border="0">

its kinda hard to hit WOT sometimes <img src="images/icons/wink.gif" border="0">

CMNTMXR57

I'd add in short term trims too. I looked at both short and long term as part of my criteria when I was making sure my MAF was ok.

DriveATransAm

hey, get on AIM lane, so we can talk about it <img src="images/icons/smile.gif" border="0">

Kenny H

Great info!

I sent you an email Sunday night telling you about my pinging. With my car 4% rich with the MAFT I see 28-30 degrees of timing and a real small amount of knock retard, like 0.1-0.3. The pinging appears to be gone. Anything else I should check?

kewlbrz

For tuning air/fuel fundementals see:

www.vetteguru.com/mods/howto

ShooterSS

iTrader: (3)

Might want to throw a 'Current Gear' in there too to see if you're getting any KR between shifts and if so, which shifts. Will also tell you where you're shifting at. <img src="images/icons/smile.gif" border="0">

DriveATransAm

good idea booby.

i thought about it, but then forgot all about it when i saw all the other features <img src="images/icons/smile.gif" border="0">

i went for a 5 minute drive-saw 0 knock retard the whole damn time. guess thats a good thing, huh <img src="images/icons/smile.gif" border="0">

RPM WS6

iTrader: (3)

[quote]Originally posted by Nine Ball:
<strong>I've always preferred the DOS-based version myself, not really the Windows version.

Look for the items list of things to monitor and select:

B1S1 O2 sensor (left front O2)
B2S1 O2 sensor (right front O2)
Ignition Timing
Engine speed (rpm)
Knock Retard
Engine coolant temp
Long-Term Fuel Trim B1
Long-Term Fuel Trim B2
Throttle Position (shows in %)

So, get those on one screen and go log some wide-open-throttle runs. Those are the only ones that are worth anything (100% throttle).

You basically want to get:

0 degrees KR
O2 readings in the 0.890-0.900 range
28+ degrees total timing
Engine coolant below 190F
LTrims close to 0 as possible

Hope that helps!
Tony</strong><hr></blockquote>

Nine Ball...

Here is my concern, my O2s are usually around .910 and my Ltrims are ~7% (both banks). I've got stock MAF ends, stock MAF, stock intake. Why is the PCM adding fuel? Aren't my O2s rich enough? My mods are below. Thanks...

[ November 14, 2001: Message edited by: RPM WS6 ]</p>

Rob98Z

Read 02's only at WOT (wide open throttle - throttle position at 100%) and LTerm's between fuel cells 1-19 (normal cruise).

RPM WS6

iTrader: (3)

[quote]Originally posted by Rob98Z:
<strong>Read 02's only at WOT (wide open throttle - throttle position at 100%) and LTerm's between fuel cells 1-19 (normal cruise).</strong><hr></blockquote>

Why would you want to read Ltrims at normal cruise? They’re like 11-14% from what I remember at those rpms. Isn’t WOT more important? The O2s I gave were at WOT too.

Ragtop 99

iTrader: (7)

Cruise LTRIMs are important if you start messing with a MAFT. They can also point to a systematic problem in your fuel system.

I log LTRIMs and fuel cell in one run and the next run I log O2s, KR, timing, and rpm. I try to keep the number of items logged low because it reduces sampling time and increases the number of data points.

kewlbrz

[quote]Originally posted by RPM WS6:
<strong>

Why would you want to read Ltrims at normal cruise? They’re like 11-14% from what I remember at those rpms. Isn’t WOT more important? The O2s I gave were at WOT too.</strong><hr></blockquote>

Fuel trims are frozen at WOT and are useless to monitor. Fuel trims are monitored at fuel cells 1-19 (not WOT and non IDLE).

O2's are the only thing to look at regarding a/f at WOT with respect to tuning.

RPM WS6

iTrader: (3)

[quote]Originally posted by kewlbrz:
<strong>

Fuel trims are frozen at WOT and are useless to monitor. Fuel trims are monitored at fuel cells 1-19 (not WOT and non IDLE).</strong><hr></blockquote>

Thanks, I never knew this! I’ve already learned something from this new site <img src="images/icons/smile.gif" border="0">

CMNTMXR57

[quote]Originally posted by DriveATransAm:
<strong>hey, get on AIM lane, so we can talk about it <img src="images/icons/smile.gif" border="0"> </strong><hr></blockquote>

Sorry, I was in sleepy land. <img src="images/icons/grin.gif" border="0">

I don't throw gear selection in there as I can tell by RPM what's going on.

One thing with Autotap, you don't want to be monitoring too much info at once, especially if you are logging as it will slow down the sampling rate.

CMNTMXR57

keep in mind too, LTrims at WOT throttle being frozen, there is a reason. At WOT throttle, it'll be trying to deliver as much fuel as possible anyway, so you wouldn't get an accurate reading.

O2's should be in the high .800's to low .900's. I think if you go over .930, you may want to look into why it's running rich.

RPM WS6

iTrader: (3)

Ok, so now that we’ve cleared up the O2 and fuel trim issue, lets talk about timing. At WOT, I’ve never seen any more than 27.5 with 0 KR. Should I have more advance?

CMNTMXR57

Nope. 25 to 28 degrees of overall timing (total advance - knock retard) is considered perfect so you're right within that range.

According to Shooter though, 01's & 02's like a little less timing though.