New best FATS/FATS+ times with a couple Lemmi changes.....

PSmalls::DoggieStyle · 10-20-2005, 09:58 PM

I decided to pull a little timing and fuel for tonight's testing. I prevoiusly had timing at +1.5 degrees and fuel at -17%. For tonight, I set timing back to +0 and fuel back to -18.4%.

Compared to last night (see link below), the car was .02 seconds quicker in the FATS (4200-6500) RPM range and .15 seconds faster in the FATS+ (4000-7000) RPM range with these tweaks...and tonight's testing was done in 6 degrees warmer weather FWIW.

I did *not* clear codes after making these changes, but I drove around for ~15 miles between making the changes and doing this run.

Note: ~1/4 tank of 94 octane, ~900' above sea level, 51F.

Like last night, ~22.5 PSI peak tapering....

Low end correction went down quite a bit....

I plan to pull a bit more fuel....

Link to last night's post

EdyJun · 10-20-2005, 10:24 PM

Mike2kS4 · 10-20-2005, 10:38 PM

Your car likes teh .86/.87 range

When I was on K16 it liked .83/.84 for some reason. Now it's all about the .87x

PSmalls::DoggieStyle · 10-20-2005, 11:18 PM

Actual timing didn't change much, if at all, going from +1.5 to +0. The main reason I pulled the timing was because of the fuel pull. I want to keep leaning it out for sh*ts and giggles.

PSmalls::DoggieStyle · 10-20-2005, 11:20 PM

I'm going to try -20% next :-O

EdyJun · 10-20-2005, 11:28 PM

Colder weather = more/denser air and you will need more fuel.

PSmalls::DoggieStyle · 10-20-2005, 11:36 PM

Pulling fuel only decreases the air/fuel ratio.

EdyJun · 10-21-2005, 12:08 AM

You are tunings your car @ 50 deg and making your car run leaner. When it gets wormer let say 95 deg., will the A/F (leaner) mixture be ok for that temp ?

I know you are running higher that 91 octane and maybe it will not make as much difference for you, but if you were running 91 octane w/ the leaner mixture will you have a problem in 95 deg weather?

What I am trying to ask is if you tune your car in extreme cold weather conditions will it be ok in extreme hot weather? Will the ECU / MAF be able to compensate w/ homebrew setup or do you have to "re-tune" it in the summer and again in the winter?

Edy

PSmalls::DoggieStyle · 10-21-2005, 12:10 AM

I wouldn't recommend goinig this lean or leaner on 91, though.

EdyJun · 10-21-2005, 12:17 AM

10-20-2005, 09:58 PM	#1
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	New best FATS/FATS+ times with a couple Lemmi changes..... I decided to pull a little timing and fuel for tonight's testing. I prevoiusly had timing at +1.5 degrees and fuel at -17%. For tonight, I set timing back to +0 and fuel back to -18.4%. Compared to last night (see link below), the car was .02 seconds quicker in the FATS (4200-6500) RPM range and .15 seconds faster in the FATS+ (4000-7000) RPM range with these tweaks...and tonight's testing was done in 6 degrees warmer weather FWIW. I did not clear codes after making these changes, but I drove around for ~15 miles between making the changes and doing this run. Note: ~1/4 tank of 94 octane, ~900' above sea level, 51F. Like last night, ~22.5 PSI peak tapering.... Low end correction went down quite a bit.... I plan to pull a bit more fuel.... Link to last night's post

10-20-2005, 10:24 PM	#2
EdyJun Member Account #: 48484 Join Date: Dec 2002 Posts: 2,849	Why didn't you pull timing sooner? (to test FATS) __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-20-2005, 10:38 PM	#3
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,105	Good deal. 9 peak CF is a good place to be, imo... Your car likes teh .86/.87 range When I was on K16 it liked .83/.84 for some reason. Now it's all about the .87x __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

10-20-2005, 11:18 PM	#4
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	No reason. FWIW, I think it's the fueling change that made a difference. Actual timing didn't change much, if at all, going from +1.5 to +0. The main reason I pulled the timing was because of the fuel pull. I want to keep leaning it out for sh*ts and giggles.

10-20-2005, 11:20 PM	#5
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	Yeah, I have no problem with those CFs. Cylinder 6 seems to hate me anyway ;ppp I'm going to try -20% next :-O

10-20-2005, 11:28 PM	#6
EdyJun Member Account #: 48484 Join Date: Dec 2002 Posts: 2,849	Are worried about weather changes, will it cause any problems for you when you pull fueling? Colder weather = more/denser air and you will need more fuel. __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-20-2005, 11:36 PM	#7
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	Ummm, we have a MAF sensor. MAF readings go up, more fuel. Pulling fuel only decreases the air/fuel ratio.

10-21-2005, 12:08 AM	#8
EdyJun Member Account #: 48484 Join Date: Dec 2002 Posts: 2,849	Let me re-word it. You are tunings your car @ 50 deg and making your car run leaner. When it gets wormer let say 95 deg., will the A/F (leaner) mixture be ok for that temp ? I know you are running higher that 91 octane and maybe it will not make as much difference for you, but if you were running 91 octane w/ the leaner mixture will you have a problem in 95 deg weather? What I am trying to ask is if you tune your car in extreme cold weather conditions will it be ok in extreme hot weather? Will the ECU / MAF be able to compensate w/ homebrew setup or do you have to "re-tune" it in the summer and again in the winter? Edy __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-21-2005, 12:10 AM	#9
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	It should be fine in both conditions with the pump gas we have out here. I wouldn't recommend goinig this lean or leaner on 91, though.

10-21-2005, 12:17 AM	#10
EdyJun Member Account #: 48484 Join Date: Dec 2002 Posts: 2,849	Do you think 0.87-0.89 would be safe on 91 for winter / summer? __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

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