To start off, AGP is doing all my SCT tunes and never had a problem untill now.
Not too long ago I switched to 1000cc injectors. I did not notice until about one month ago that my cruising AF/r's sit at about 13.8/14.0.
My short and long trims are within 2 points of being 0. so the PCM is not trying to take any fuel away. And yes i did put a new O2 sensor in.
After talking with kevin @ AGP, he has come to the conclusion that it must be the size of injector that makes it that af/r while cruising, not any part of the tune.
Its not that I dont belive him, he has alsways been there to answer any qestions I had and help me with my tune at any moment.
But i just want to conferm.
I used to get about 30MPG and I now see it had droped to about 20mpg... kinda sux.
So is it truly due to having the 1000 injectors, or is it somewhere in the tune?
Most big ass injectors flow like shit or spit at low flow or pressure. I have no clue the background on your issue but just keep that in mind. There are only a few different body's of injectors and some are better then others!!
Hmmm.... What speed are you cruising at. I think I might have the same problem. When I am on the interstate its around 13-14.2 or so... My car is sitting with the the battery unplugged. Going to plug hook it back up when I go to work tonight.
Hmmm.... What speed are you cruising at. I think I might have the same problem. When I am on the interstate its around 13-14.2 or so... My car is sitting with the the battery unplugged. Going to plug hook it back up when I go to work tonight.
Any cruising speed really. 45mph,50,60 and so on. it just needs to be a consistant speed. (where the PCM should be targeting a 14.7 af/r)
Any cruising speed really. 45mph,50,60 and so on. it just needs to be a consistant speed. (where the PCM should be targeting a 14.7 af/r)
damn. I was in that range. (I am Stage 3w/toys) Then I put the AGP S3 WGA on the car, was boostin way too high because I ahd the bleed in there on PCM control and I think I got a couple coutns of knock. So I just put the stock WGA back on and I noticed my AFR's were 13.9-14.3 cruising. Hmmm.
Exhaust leak?
You could be really losing out with those injectors, with the deadtimes, and flow issues. Sorry, missed the O2 sensor part. Might check your grounds, too. Is there a reason why you went with such a large injector? 1000cc rated injectors are 1155cc injectors at 58psi. Have you tried lowering fuel pressure to see if it comes in line ? I am betting that it will help a little, but you are also fighting the low impedance injectors syndrome. There is always a tradeoff.
You could be really losing out with those injectors, with the deadtimes, and flow issues. Sorry, missed the O2 sensor part. Might check your grounds, too. Is there a reason why you went with such a large injector? 1000cc rated injectors are 1155cc injectors at 58psi. Have you tried lowering fuel pressure to see if it comes in line ? I am betting that it will help a little, but you are also fighting the low impedance injectors syndrome. There is always a tradeoff.
I will take a look at my grounds. Other then the one behind the head by the turbo where else is there grounds?
I had 750's (RC) and maxed them out at 477whp, tossed in 1000's (RC) and got 514whp maxing out the single pump. Now on duel pumps and i want to get all my issues worked out bofore I (AGP) start working on the tune.
And yes I had this problem before i tossed the duel pumps in.
My fuel setup is 50psi rising rate. I guess ill talk to Kevin and see what he thinks about me lowering the fuel pressure. since he is building the tune i dont want to go changing vital parts of the car to throw off the tune.
Other then this little problem my tune is perfect.. I want to keep it that way.
damn. I was in that range. (I am Stage 3w/toys) Then I put the AGP S3 WGA on the car, was boostin way too high because I ahd the bleed in there on PCM control and I think I got a couple coutns of knock. So I just put the stock WGA back on and I noticed my AFR's were 13.9-14.3 cruising. Hmmm.
Exhaust leak?
I will take a look at my grounds. Other then the one behind the head by the turbo where else is there grounds?
I had 750's (RC) and maxed them out at 477whp, tossed in 1000's (RC) and got 514whp maxing out the single pump. Now on duel pumps and i want to get all my issues worked out bofore I (AGP) start working on the tune.
And yes I had this problem before i tossed the duel pumps in.
My fuel setup is 50psi rising rate. I guess ill talk to Kevin and see what he thinks about me lowering the fuel pressure. since he is building the tune i dont want to go changing vital parts of the car to throw off the tune.
Other then this little problem my tune is perfect.. I want to keep it that way.
Thats nutz.... I made 412WHP on a 35R @ 20-21psi and STAGE 2 injectors, it ran almost 13:1 @ redline but still make some good power / torque.
I now have 750's, run around 24psi low boost and 30psi high boost and the car is still around 11:1.
Actually your PCM targets about 14.3:1 by default. Have you talked to AGP about it at all since they are doing your tuning? The Stoich FA Ratio table determines what AFR it will attempt to hold while in closed loop. I'm sure that is something AGP is well aware of. If you've ruled everything else out, I'm sure if you talk to your tuner they will help you figure out what is going on.
__________________
One of a kind custom turbocharged 2004 Chrysler Sebring LX Sedan
.:CarDomain:.
13.5 @ 102mph
Actually your PCM targets about 14.3:1 by default. Have you talked to AGP about it at all since they are doing your tuning? The Stoich FA Ratio table determines what AFR it will attempt to hold while in closed loop.
No, the Upstream O2 sensor determines Closed loop A/F. The Stoich FA Ratio table is a starting point for Open loop.
Imo this is not his problem.
__________________
"Just because someone goes fast doesn't mean you should do whatever you think they did.
This path assumes they knew what they were doing, which isn't necessarily the case"..........RB Racing
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
13.8/14.0 AF/r While cruising...
etc...
I am on S3 PCM with no tune. 
Linear Mode
