WOT runs from 1-6 gears (not maxing out)
I saw my AFR's leaning out to 11.9 in 6th before I let off..
I felt a little bit boggy and felt like the engine was stuttering in 6th gear. It was about 39F outside at 4 A.M. My usual AFR's are not even near 11.5, when it is around 60 degrees outside, my AFR's leanest point is 10.7. When it is about 50F outside, it is at around 11.3... I do have a restrictive exhaust (Greddy Evo II) and AAM plenum spacer. I was wondering if anybody else was experiencing the same thing. I guess it is time for tune!

 

This is normal, when it gets colder you car will build more boost unless you have an electronic boost controller. Back when i drove my Turbo Buick i would love when it got cold. I could be wrong but i am pretty sure about this.

 

your car shouldnt feel boggy when it leans out..it happens when you are pig rich. Also, the greddy evo 2 isnt really that restrictive at stock boost levels so you are fine there. I would suggest a boost controller and lower the gain on it during the colder weather. In my experience, my turbos spool quicker in the cold.

 

Where did the term "pig rich" come from????

JET

 

Just a guess, but if the car was feeling boggy, it could be detonation making it feel like that.

What are you tuned with?
Do you have boost control?
Any increase in boost levels in this colder weather?

 

yes i guess it could because the ecu is pulling timing..

best advice, dont drive it hard until its fixed

 

what are your plugs gapped at?

also, i suggest just for reference sake, recalibrate your wideband.

 

It is another term for filthy rich. EI: Pigs are supposedly dirty animals, so you can be filthy rich, pig rich...ei...you are a fat slob of richness.

 

Thanks for all the advice and I already know the basics... boost getting higher, AFR leaning out in cold weather.

I am running the turbonetics flash and my plugs are one step colder than the oem ones. I don't have a boost controller but my boost gauge reads around 8.5~8.7 when that cold. I actually think that the car might have been pulling timing. I also think my wideband is fine because when my car idles good, it reads around 14.7 but I might check it again just to be sure of it. Anyhow, I only feel this in 6th gear...

 

You should always get your car tuned in the coldest part of the year so you'll never have to worry about it getting too lean when the dense air returns.

Sounds like you just need a retune for the weather.

 

I can't figure out why people say you get more boost in cold weather. This is simply not true. The amount of boost shouldn't change.


What happens is simply cooler air is much denser and therefore can make significantly more power from the same volume than the same volume of warmer air.

I was asking what your spark plug gap is. That's pretty important, you might have to gap them a little closer.

 

I know the spart plugs are gaped colder than stock... It doesn't say on the parts list what the gap is. It only says AAM spec turbonetics spark plugs. What is the ideal gap for spark plugs??

Anyways, my car does in fact change boost in cold weather but it is not a big amount. It is less than .5 pounds of boost... I am planning to have the car tuned in the winter times so I will not have to tune again for the cold weather enviorment

 

Also, the spark plugs should not effect the AFRs and I am curious if other's ECU flash leaned out to 12 around 40 degrees outside.

 

This is due to a poorly engineered engine managment, an RPM based tune on a F/I car is playing with fire...

 

I had a feeling i didn't know what i was talking about. It's been 6 years, please forgive me.

 

your gap should be .032 or .030". That might help the breakup condition you're noticing up top. Also when you pull the plugs, check them, detonation usually leaves white specs all over the electrode and base.

 

THANKS TO THE PEANUT GALLERY

 

Truth hurt??

 

So since I am about to with UTec... Do you guys think 380cc is not enough for around 380-390whp??

 

Did the car ping? I have seen a .5 PSI increase when it gets into the 30s here but I've never leaned out to the point of detonation. My fire must not be that hot cause I've run for 40k miles now with no issues.