should i be concern about the afr? i'm not worried about the hp/tq number just the afr. TIA



Modified by 3rdgenLS at 8:30 PM 8/8/2007

 

It looks like it doesnt get richer than 11.0 from what I can see and it also appears to be nice and consistent. Why are you worried about it?

 

make sure its around 11.5:1-11.8:1

afr is not the only clue that a motor is going tho, if you are concerned then i would suggest using an EGT gauge.

 

i was comparing my graph with my older one and it doesn't pass the red line. this graph seems is leaning out a bit below 3.3 rpm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 3rdgenLS &raquo;</TD></TR><TR><TD CLASS="quote">i was comparing my graph with my older one and it doesn't pass the red line. </TD></TR></TABLE>

the red line looks to be at 13.0:1

was the old graph an all motor setup? all motor and turbo setups are very different when it comes to AFR tuning. i would hope a turbo setup never went leaner then 13.0:1 on a daily driver.

 

Its fine, im pretty sure he wasnt even on it yet on the dyno below 3300.

 

the old graph and this recent one are both fi. the only difference is i installed a 255 hp fuel pump, replaced piston rings and bearings.

 

Looks fine. How much boost are you making from 2800RPM - 3500RPM? I would be more worried about the dyno's wideband usage and filter upkeep, haha

 

ok, i'm convinced that the afr is fine. the boost is at about 3 to 5psi between those rpm range.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 3rdgenLS &raquo;</TD></TR><TR><TD CLASS="quote">ok, i'm convinced that the afr is fine. the boost is at about 3 to 5psi between those rpm range.

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as you should be. looks fine to me

 

its fine lol

i refuse to use those damn air fuel pump things. they very sooo much car to car and you seem to have to replace the filter damn near every time you use it, which nobody does. thats assuming that they are using that here lol

power/torque drops like crazy after 5500....whats the set up?

 

yeah..it was my internal wastegate being shut. so, that might be because of the boost cut, which is set @ around 10 pounds, i got that problem fixed and also installed a mbc and lowered the boost @ 8 pounds (which i assume is fine after the tune) and now the boost is pretty steady @ 8 pounds after 5.5 rpm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">its fine lol

i refuse to use those damn air fuel pump things. they very sooo much car to car and you seem to have to replace the filter damn near every time you use it, which nobody does. thats assuming that they are using that here lol

power/torque drops like crazy after 5500....whats the set up?</TD></TR></TABLE>
yea i agree i've gotten some screwed up readings to those compared to widebands i put in the downpipe.