Enthalpy lean at idle? Video! help

[srdub-t]

still having issues! I put my wide band in and when im at idle (when it idles that is) my air fuel starts at ten then after a sec it will go all the way lean??? And when im driving WOT is good, but when im cruizing at lets say quarter throttle my air fuel is like 17?? video of my wideband at idle

[srdub-t]

also when i drive my car everytime i let off the gas the car dies then it take like 30 seconds of cranking to start back up. I checked for vac leaks still no answere. Tune related?

[srdub-t]

no body

[idahotuner]

ifi new i would tell you, but it seems as if therer isnt many people on here right now.

[srdub-t]

yea it seems that way thanks any way.


Modified by srdub-t at 3:17 PM 10/30/2007

[srdub-t]

i gotta cookie for who ever can figure it out!

[sx_hatch]

what kind on set up are you running, do you have a safc, have you messed with it

[srdub-t]

hahah my setup is better than your setup thats all you need to know. haha jk hows the ls1

[DrifterProdigy85]

I think its your O2 sensor. I dont run a 02 in my RB and it does the same thing. RB runs rich around 13.0 when first started, then leans to 15.5 after warmed. Runs lean around 15.8 untill near WOT then is tuned SAFC for 11.5. The 02 works in my SR and idles rich at 13.0, cruises under vacuum at 14.7, and slowly richens entering boost and WOT is 11.5. Thats Enthalpy tune as well.

[DrifterProdigy85]

Also the reason your WOT is accurate compared to cruising is because the ECU goes into "closed loop" which doesnt read the 02 voltage. Honestly i monitor my RB with the knock reading of the SAFCII and cruisng around 15.8 like i am i never see knock. Thats also with light boosting too.

[Blown240sx]

Here is your answer

A/F can and should be lean around idle and cruising. Cruising itshould be int he 15 area. This is so you fuel economy will be good. Under 0 vacuum 0 boost you should be in the 12.0 range.Under boost A/F should be near 10s or in 10s.

The die after pushing in the clutch is because you have an atmospheric BOV. When you blow off all the metered air the MAF reads is expelled. This causes an extremely rich condition due to fuel being added but no air due to being blown off.If you get an SAFC 2 you can tune that out by setting the 0% throttle setting which automatically will add the appropriate fuel when the throttle is let off.

[sx_hatch]

in the 10s in boost seems pretty rich if you ask me im almosts sure 11.4 to 11.8 was the perfect a/f reading

[xsublimefrekx]

in boost you should be at 11.4 or around that. 10 .0 is really rich for boost.

[GTS4-R]

lean at idle = OKlean at WOT = NOT OK

my a/f ratio is jumps from 14.0:1-16.0:1 (maybe leaner gauge only goes to 16) with my enthalpy tune at idle... thats just fine.... there is no fuel deand or load at idle.... at WOT my a/f was spot on buried at 12:1! thats a sick tune! IMO (12:1 is perfect balance between safe and most power IMO)

[srdub-t]

hey guys sorry iv been busy latley havent gonten a chace to check it out yet, but this is what enthalpy had to say about it: "ahhh,

Deatchworks injectors. thats one of the issues with deatchwerksinjectors. they can be non-linear at low pulsewidth situations.(idle/cruise). and the flow characteristics vary greatly from onebatch to another in my experience. the 17:1 cruise isnt hurting yourengine. there isnt enough load on the motor to cause any damage.

as for the stalling and startup issue. how much piping do you havebetween the turbo and the MAF? Have you checked to make sure that theorange startup wire is connected properly in your ECU wiring (plugthat goes up to the dash)."

[DrifterProdigy85]

Running 12.0 at 17+psi is alright as long as you know for sure you have real good 93 octane. You get some bad gas and start detonating youll wish you ran little richer. I like running 11.5 @ WOT. Definitly not rich and not gonna have to worry about running lean. No real power sacrifice either. The real power comes with the Ignition Timing and not as much the AFR.

[srdub-t]

im good at WOT its like 11.3, its mainly the not idling issue im worried up, and when i try to start it after it dies it takes like 30 seconds of cranking to finally start.

[turbomrdeuce]

dude none of you guys have told him anything usefull..... some have made totally false statements and some arent using their minds for his setup. Your best bet is to stop wasting your time on these noobs and ask either a. the ogs on this site that know wtf theyre talking about or b. call a shop thats known for tuning and ask them what they think.

[DrifterProdigy85]

i still say its 02. The 02 is for Fuel Enrichment. Without it, the car will run lean on cruising and rich at idle.