What needs to be tweaked from these logs?

**Allaidback** · 11-18-2008 08:18 PM

How is my timing and a/f ratio...i'm trying to fine tune the car with lemmiwinks, so let me know what I need to do or what I need to get fixed. Thanks. This is also with a MBC w/ N-75.

Boost:

http://spreadsheets.google.com/ccc?k...1r5XEXGFaSvsfw

A/F Ratio:

http://spreadsheets.google.com/ccc?k...1r5HPGTfXoBIGA

Timing:

http://spreadsheets.google.com/ccc?k...1r41UTfdAMfaLw

Block 02

http://spreadsheets.google.com/ccc?k...1r54drSdy-GXNg

**RogueStatus** · 11-18-2008 09:38 PM

what are you using for tuning? i was about to start tuning with the revo or unitronic software i have,but my clutch fried before i could.

**ThePaintballGuy** · 11-18-2008 10:07 PM

Re-Read First Post!!!! He says in the first line!

I am also curious what people say because I too have been messing with stuff.

josh

**rouellettea4** · 11-18-2008 10:13 PM

It's tough to tell with that one run of data on hand, but it looks to be a fairly lean run with o2 v's at 0.81-0.84 but I can't line it up with RPMS. What kind of tune are you running? What's injector duty cycle looking like, looks like the requested boost is up near 23-24 psi and MBC clipping it off at about 22. CFs are nice and low but I wouldn't even consider messing with timing advance through lemmi because all the factors are going to change as you play with boost and fuel. If your IDC is high than you may need to cut back on the boost a bit. If not you may want to add it in small increments, aiming for about 0.85v at WOT. Log a lot, and do it on every change you make, monitoring FATS and all variables to see how one is affecting the other.

DO AT YOUR OWN RISK.

**Allaidback** · 11-19-2008 06:35 AM

Originally Posted by rouellettea4

It's tough to tell with that one run of data on hand, but it looks to be a fairly lean run with o2 v's at 0.81-0.84 but I can't line it up with RPMS. What kind of tune are you running? What's injector duty cycle looking like, looks like the requested boost is up near 23-24 psi and MBC clipping it off at about 22. CFs are nice and low but I wouldn't even consider messing with timing advance through lemmi because all the factors are going to change as you play with boost and fuel. If your IDC is high than you may need to cut back on the boost a bit. If not you may want to add it in small increments, aiming for about 0.85v at WOT. Log a lot, and do it on every change you make, monitoring FATS and all variables to see how one is affecting the other.

DO AT YOUR OWN RISK.

It's AWE, GIAC stage 3 software w/boost controller. I haven't messed with the boost controller setting yet but am going to after seeing that log. Isn't that boost request kind of high? I should be pushing no more than 21psi at redline correct? Also, what is IDC? So, if i'm running lean then I would need to add primary fuel? What field should I log for FATS times. Thanks for your help.

**S obsessed** · 11-19-2008 06:49 AM

IDC= injector duty cycle. what fuel are you running? 93?

**Allaidback** · 11-19-2008 08:16 AM

Originally Posted by S obsessed

IDC= injector duty cycle. what fuel are you running? 93?

Yes, 93 octane. What are high numbers for IDC?

**highPSI-S4** · 11-19-2008 08:21 AM

Also it has been told before if using VAGCOM to log the sample rate gets slower when you add more block, thus the info isn't as correct or clear. You should log one block at a time.

I was told this before when i was logging. The best program to log multiply blocks with is ECU-X. Not sure what you have but it looks like VAG-COM software.

I 2 want to know what the block for IDC is.

**S obsessed** · 11-19-2008 11:19 AM

For duty cycle you have to log 002 than use this calculator http://www.stealth316.com/2-calc-idc.htm Basically you want your duty cycle under 100% with the smallest possible injector to get the best atomization of the fuel.

**Allaidback** · 11-19-2008 08:39 PM

Just logged my IDC and it was at 93% at 6440 rpms. My o2 voltage is around .83 at 6800 rpms. So what should I do?

**highPSI-S4** · 11-19-2008 08:45 PM

This link should help explain somethings for you. Scroll down on the left to VAGCOM click it then click on Understanding fuel trim. i was just reading it, should be semi helpful.

http://homepage.mac.com/edyjun1/S4/index.htm

**rouellettea4** · 11-19-2008 09:28 PM

FATs can be calculated in any block where there is a engine speed block and a timestamp. You can run whatever boost you want, but the more you run, the more fuel will be needed and the harder it is on the turbos. I'd say take the boost down a little bit to maybe 21 lbs or so, let it adapt, re log, see where o2 voltages are at, and then maybe tweak from there.