well, i got the lm1 installed and i was happy to see i was noit leaning out, but was running really rich. the fattest i saw was 9.6 afr, but it mostly stayed in the 10.2- 9.8 afr range. im running a stock fuel setup (except for fuel pump) as of now. i am having a hard time trying to pull up my recorded data on my computer. if anyone could walk me through it id appreciate it. btw, im ganna tune the fuel to around 11-11.5 when i get my fuel hardware installed... this sound safe for pump gas? im more looking for feedback on what everyone else's afr's looks like.

 

11.5 is very safe on pump gas. You can effectively run more timing with an 11.5 afr on 93 octane. Do you have a Walbro 255 on there? It is known to richen it up quite a bit and that is prolly what you are noticing. What type of fuel managemnet are you going to use?

 

255 intank, and i have installed a emanage and profect e-01. but the emanage is at 0.

 

Where id you install the wideband o2? I installed mine in the test pipe and im not sure if im getting accurate readings. I took out all my A/F controller and everything is back to stock besides walbro 255 pump and other mods but the only thing that might effect the a/f is the intake filter and walbro. All my mods are posted in my signiture. But im running mid 11's to low 12's when i get on it. Is that right for stock? From what i hear it isnt but thats what it is reading. When i just cruise around barly on the gas im in the 14's. When i get on it is then it hits mis 11's low 12's. Is this right?

Thanx
Chris

 

yes, at idle or at normal driving you should be around 14.5-14.8... it fluctuates. im a bit confused by your reply, are you stock or do you have the gt35 turbo kit and stuff? if your bone stock you should be about where im at. if you have the turbo im sure your ganna be leaner than i am. also, make sure your sensor is not behind a cat. you said you have a test pipe... id say you might want to run it closer to your turbo. mine is at the bend of the downpipe, about 1 foot or so behind the o2 housing. i find as long as your temps near the outside of the pipe are not too hot for your sensor , its ok.

 

Right now i just got the cams, cam gears, downpipe, test pipe, cat back, pulleys, intake, intercooler piping. All the rest of my parts are sitting in a pile in my bedroom . The turbo kit should be here this monday or tuesday and as soon as i get that i will install everything at once. But i took out my boost controller and air fuel controller so everything is back to stock as far as that and im getting cruising in the 14's and when i get on it in the high 11's low 12's. Is that right? I thought that our cars run pretty rich and from what i know what is not bad at all. Or is it becouse i have my wideband sensor in the testpipe and it is not giving me a accurate reading?

 

you stilll should be given a fairly accurate reading. after all, cat-less cars are able to have the sensor at the end of the exhaust. what is your boost reading? did you calibrate your sensor correctly? is there a small leak in your exhaust anywhere? all of these can cause that.... but you should be running richer than that. arfe you just "getting on it" or wide open throttle? pull your plugs and see how they look. also, what is your egt readings?

 

I'm very interested in these afr threads, but have no experience with turbo'd cars afr.
Since anything under 12.5 on a NA car would be useless it would imply that you would want to be as close to that as possible. Except on a forced induction with the added heat and pressure extra fuel is used to keep the knocking down. Thus I would say if you don't have issues with knocking you would WANT high elevens and low twelves for afr under full load.
Cruise on some new cars can be way lean, again with the computer playing with inputs the auto makers can tune for highest mpg. 16 and 17 afr under cruise under certain conditions.

I'd give Klaus a question on their BB at lm1.

 

A number of things will affect your AFR. What I notice that would influence your AFR the most is your HKS 272's and your intake. Pretty much anything on the intake side that will affect the MAF will change your AFR. Intakes are known to affect it the most. When I was running my HKS RS intake without tuning my car was running dangerously lean. The ECU would retard my timing and my EGT's rose to as high as 940 C!!!!!! Luckily I noticed it and let off right away, so nothing was damaged. An AFR of mid 11's is still very safe as long as you are not going above 12:1 in the higher rpms. When you are just cruising around the AFR will be in the mid 14 range. This is normal as to proivde the best fuel economy. The ECU monitors the first O2 sensor to achieve this stoich condition.

 

I wonder if the Apexi intake will throw the a/f mixture off pretty bad?? I have an SAFCII and walbro255 for fuel management so I can add or take out fuel a little, just dont know what my a/f is.

 

Thanx allot for the info. I think i found the problem. I had this guy take out my Apexi Boost Controller and when he did he did not put the stock pill back in. So i threw the pill back in while i changed my headstuds too everything out now im running 21psi then drop down to 17psi. A/F are in the high 9's to low 10's at WOT. Crusing around is in the 14's. So now i can see that our car really does run really rich. This week the turbo kit and the AEM will be going in and from there i will see what i can do with the a/f ratios. So it is safe to say once i get everything in at WOT i should be in the mid to low 12's?? My next step is to figure all this AEM crap before i take it to the dyno to get it fine tuned and dynoed. Thanx agian for the info!

 

i wouldnt go into the 12's unless on race gas. i just tuned my car on wot to 11.2 tops and i am seeing about a 25 whp gain. at the high rpms around 5500 to 7000 it wants to run richer, so im ganna lean it out a bit more up top... at 18.9 psi im making around 20whp more than before at 19.6 psi. its a nice overall gain... im glad i got the lm1.