um AFR not right at all. please help - SRT Forums

lil_hub_cap · 11-04-2009, 02:10 PM

hey so im worried about my car at this point. I moved up to wyoming for school, and now thats its officially winter, im running leaner. Yes i do realize that its a very typical thing to run leaner in winter, but not like this. During dummer my afr was roughly 14.7 and wot 11.8-11. now thats its winter, my wideband has been spazzing out, and even just idaling, goes from 14.7 - 15.6 and when i drive and accelerate it rarely drops below 14. its really strange. Im not sure if my wideband is just completely fucking up, but idk.

For the most part it ran just fine, i took it up to quick speeds, running 19lbs atm. there was a bit of a drag, but im really not sure what the cause is, i thought 02 at first, replaced and nothing. any thoughts would be great.
thanks!

EDIT: Well i started work on my car yesterday, and checked into the codes. As it turned out, it kept yelling at me about a problem with my MAP sensor, and i couldnt figure it out. Ended up volt dropping the Bulkhead connector going into the map and i had a bad ground.
All is well....for now at least haha.

thanks guys

bene · 11-04-2009, 02:12 PM

sounds like its working fine. the numbers will be a little off for a while weather depending but 14's and 15's is normal.

m4ster_chef · 11-04-2009, 02:36 PM

No... he said when he accelerates it doesn't drop below 14.x... that's not good. If it's IDLING at that you're fine. But if under WOT it's not going below that you're in need of some help.

bene · 11-04-2009, 03:05 PM

accelerating and WOT are 2 different things... he used both words so im assuming he knows what to use

accelerating at 14-15 is normal

m4ster_chef · 11-04-2009, 04:37 PM

Ok... yeah.. that's true. Accelerating (meaning here 1/2-3/4 throttle) AFR's in the 14.Xs are ok, but he had been talking about his WOT AFR's so that's what I was going by. I understand what you're saying. I just took the SRT for a drive and to get some new plugs (had to go to 5 parts stores to find some 4306's) and I paid close attention to the AFR. I don't guess i ever paid much attention to the afr's when under partial throttle. I will be granny driving or WOT from now on. I can't believe that partial throttle won't hurt the motor.

bene · 11-04-2009, 04:42 PM

^^ shouldve gone to napa first

whats "I can't believe that partial throttle won't hurt the motor." mean?

m4ster_chef · 11-04-2009, 05:54 PM

Out of habit I will accelerate partial throttle. I don't wanna go WOT but I don't wanna putt putt around. I have done some searches and my findings have resulted in the following, partial throttle is not good for the engine.

Basically, I was saying that partial throttle isn't good. It was supposed to be read, "I don't think partial throttle is good for your engine." I just said it kinda funny.

Also, Napa is on the total other side of town. I found them at O Reilly's.

**Monster** · 11-04-2009, 05:56 PM

Part throttle boosting is okay as long as you aren't seeing any detonation. Usually as long as you keep it under 8-10psi depending on turbo size you will be okay.

m4ster_chef · 11-04-2009, 06:00 PM

Quote: Originally Posted by Monster

Part throttle boosting is okay as long as you aren't seeing any detonation. Usually as long as you keep it under 8-10psi depending on turbo size you will be okay.

Yeah... But I don't have a scangauge yet so I'm playing it safe until I get one. And I have a S3 turbo, and I can't afford another one so I'm gonna stay safe until I get a scangauge.

**Monster** · 11-04-2009, 06:05 PM

It isn't the turbo that is in danger during ptb its the ring landings from detonation. Just keep the boost low during ptb and you will be fine. Sometimes its unavoidable you gotta pass people right?

m4ster_chef · 11-04-2009, 06:12 PM

Quote: Originally Posted by Monster

It isn't the turbo that is in danger during ptb its the ring landings from detonation. Just keep the boost low during ptb and you will be fine. Sometimes its unavoidable you gotta pass people right?

Won't too much PTB cause compressor surge as well?

**Monster** · 11-04-2009, 06:25 PM

Yes you are right I forgot about that. By the time it surges during ptb you should be boosting pretty hard. Well at least with a s3 turbo thats the case. Not that it has happened to me before or anything on complete accident

bene · 11-04-2009, 06:27 PM

Quote: Originally Posted by m4ster_chef

Won't too much PTB cause compressor surge as well?

yes but this is only with the stock turbo... bigger turbos dont have that problem.

PTB is not bad itself, its how people treat there cars during PTB that makes it baad

**Monster** · 11-04-2009, 06:37 PM

Quote: Originally Posted by bene

yes but this is only with the stock turbo... bigger turbos dont have that problem.

PTB is not bad itself, its how people treat there cars during PTB that makes it baad

Yeah they do My 50trim used to do it.

m4ster_chef · 11-04-2009, 07:27 PM

Quote: Originally Posted by bene

yes but this is only with the stock turbo... bigger turbos dont have that problem.

PTB is not bad itself, its how people treat there cars during PTB that makes it baad

I thought that bigger turbo's were more likely to cause compressor surge because of the increased air flow. I thought that the stocker WOULDN'T do it as easily because it's harder for it to make more boost than the engine can use.