VandykeT/A

I've got a K and N intake and trifecta tune on my SS. With the tune off the car will go low 13s a/f. With the trifecta the car will in the upper 11s. I know the trifecta will be rich but shouldn't the stock tune be somewhere in the 12s at least? I mainly get mid 13s at wot and sometimes 14s in the 3k-4k rpm range at wot. I'm not getting any lean codes or anything. I do however occasionally get a p0451.

blueLNFftw

iTrader: (16)

Holy crap.
What wideband are you using to get those numbers?

I hope it is aftermarket and not calibrated correctly.

If those AFR's are true a new engine is in your immediate future.

VandykeT/A

The RPD is what I'm using and I've been running it on the trifecta tune. The stock tune is what goes lean.

Tomtwtwtw

Sounds about right for the stock tune. If I recall right it calls for like .95 lambda in that range which is about 14.0. Everyone says how unsafe it is, and yet you don't see stock engines blowing up. If you're going to crank up the boost a corresponding drop if AFR is recommended to prevent detonation (as Trifecta does), but completely stock this is ok. Keep in mind a DI engine typically runs at least a full point leaner than a port-injected one. Your P0451 is most likely unrelated...just check out your evap purge.

umrdyldo

iTrader: (1)

Yes stock tune is kinda lean, trifecta is on the rich side as well.

blueLNFftw

iTrader: (16)

I bow out. I didnt read the forum this was in and the OP didnt post his car in the original post.

user 72239

iTrader: (4)

Sounds like stock to me

and yes the DI allows for leaner AFR, you should of seen the dyno guys when i dyno'd and my AFRs at WOT were in the 13's they were like "oh man those are such bad AFRs, it should be in the 11's" I just shook my head and was like "you guys know nothing about DI"

tomj77

iTrader: (2)

Nothing wrong with ur stock tune, that's how lean it is, it's direct injected. It's safe

raver0789

Ditch that trifecta **** with AFRs in the 11s. Its doing more damage than your stock tune. Optimal PE is anywhere between .86 and .89 lambda on the TC.

tomj77

iTrader: (2)

bs, why do people keep saying running rich can damage ur engine. no I wont, it will use more gas, and maybe clog up ur cat if u have one, but it is not dangerous or not nearly as dangerous as running to lean. richer a/f means cooler charge, leaner a/f means hotter charge, heat = danger. don't give guys bad info. id say unless u know u have very good gas, its safer to go a little richer. that's is why vince says he does it. better safe than sorry. I have never heard of a motor blowing from running to rich, but I have heard of one from running lean.

tomj77

iTrader: (2)

his a/f ratio is normal for stock tune, its di motor, no danger there.

tomj77

iTrader: (2)

don't listen to the hp tune fan boys. trifecta is a great tune. yes hp tune can get u more power with a good tuner, but ull pay a lot more money for it. if u cant afford the software, stick with trifecta. id do hp if I was willing to spend the money on the software. but till them trifecta has served me well for 4 years. no issues.

raver0789

I run 500whp on a completely bone stock motor at boost levels you never get close to. You are nowhere near that on your motor. While others continue to pop theirs I do not. I wonder why. I know more than you think and I think that this gives me enough clout to talk. You should get your oil sent away for data analysis. You talk about being lean is okay because its direct injection - the motor makes less heat at stoich and its safer. Yet the complete opposite is obviously true. Duh. Makes no ******* sense. If the car is fine at stoich 11s is oficially pig rich man. Its direct injection just like you said. It doesn't need to be that rich. Wait...no you are right. Richen it up to mid 11s like an lsj. You'll be able to run at least ten more lbs of boost because its a cooler charge.

tomj77

iTrader: (2)

I do wish vince would lean it up a bit, iv asked, I understand his concerns but it really is the owners choice not his. iv asked and he refused. but for what I do its good enough atm

breds2k

iTrader: (1)

buddy of mine went to get dyno tuned, first stock tune pull with full bolt ons (just for a base hp number), the tuner didnt take it to redline, said it was VERY lean.