Hey guys, my car is a 2005, I have the mods listed below in my car

up until about a week ago, my car would be shooting flames (I have midpipe) if I WOT it and shift at about 8.5-9k RPM

however, in the past week, no matter how hard I drive her, my car doesn't shoot flames NA anymore, if I use nitrous, then she does but NA, she doesn't even have that "POP" sound anymore

A/F is about 14.4-15 NA WOT

is this normal? is it safe?

thanks

 

in closed loop, 14 is standard. In open loop, you usually see stuff in the 10 and 11's. So WOT at 14 sounds lean.

 

Reset your Ecu.

 

Probably just the weather cooling down

 

its about 15-17 degrees celcius over here

I already did, still doesn't shoot flames........

should I be worried?

 

it shouldnt shoot flames when lean

 

sorry, I got the AF numbers wrong

its about 13.2-13.6

is that still lean?

I will reset the ECU again tonight

 

is that at WOT?

 

yes, at WOT, you can see it in my dyno

 

its still not rich, as long as its not something like 15 or 16 your good

 

ok, I resetted my ecu again and gone on a 5 minute warming (6k-9k rpm) the entire time, it makes that bubbly sound, still no pop though

but, my car is fine other wise, nothing bad, dynoed pretty strong and everything, wierd I think I'll just add 1 size jet to my nitrous just to be on the safe side

 

13's are fine for WOT. you would want cruise or idle to be stoich

 

flames/backfire is dependent on exhaust system temp(and AFR), try revving it in place at high rpms.

 

^ I tried

I tried everything, it just doesn't shoot flames anymore, I don't really care about the shooting flames, I am just worried it might point to my system running too lean etc etc

 

Is that 13:1 with the nitrous spraying?

 

no, thats NA

with nitrous its at 10-10.7 and it does shoot flames with nitrous

but without, nada T.T