Problems ALREADY!!! - SRT Forums

mebcop · 05-28-2008, 07:52 PM

Well, my car was tuned yesterday and today. It put down 383hp and 433tq on a Mustang dyno at 12:1 AFR. Well, I drive it home and I do a few pulls on the way... WOW, it was fast. Well, I get home and let the car sit a couple hours. I take the wife out to show her how it pulls now and the first pull overshoots the boost by a few pounds and it was pulling good with really good air fuels. I go turn around and on the way back I launch it, but not too hard. Well, the air fuels are now at 10:1 and stay there almost to redline where they lean out to 11:0. I don't think I've ever had a car go too RICH all of a sudden!!! I thought maybe I blew an intercooler hose off or a vacuum line, but I checked them all and they were all fine. I have to make a new boost leak tester for my 50 trim inlet, but before I do that, what do you guys think could have happened??? It's GOT to be a boost leak. I sprayed carb cleaner around the intake manifold and throttle body and there was no change in idle at all.

ANY suggestions would be appreciated!!!

Aceburner · 05-28-2008, 08:10 PM

Quote: Originally Posted by mebcop

Well, my car was tuned yesterday and today. It put down 383hp and 433tq on a Mustang dyno at 12:1 AFR. Well, I drive it home and I do a few pulls on the way... WOW, it was fast. Well, I get home and let the car sit a couple hours. I take the wife out to show her how it pulls now and the first pull overshoots the boost by a few pounds and it was pulling good with really good air fuels. I go turn around and on the way back I launch it, but not too hard. Well, the air fuels are now at 10:1 and stay there almost to redline where they lean out to 11:0. I don't think I've ever had a car go too RICH all of a sudden!!! I thought maybe I blew an intercooler hose off or a vacuum line, but I checked them all and they were all fine. I have to make a new boost leak tester for my 50 trim inlet, but before I do that, what do you guys think could have happened??? It's GOT to be a boost leak. I sprayed carb cleaner around the intake manifold and throttle body and there was no change in idle at all.

ANY suggestions would be appreciated!!!

If everything is working fine then you might want to consider the enviornment u were in when u tuned. I'm not that much of a dyno guy but if you tuned your car on a dyno, I'm sure that when you drive the car on the street, you are going to have different AFR's. I street tune because you get a more accurate tune based on the elements you actually drive in. I may be wrong but I've seen it happen a couple times.

mebcop · 05-28-2008, 08:14 PM

But it was running perfect on the street for the first couple hours, then ALL OF A SUDDEN RICH AS HELL

onthedwnlow · 05-28-2008, 08:34 PM

nothing in the tune should have changed and messed the tune up......it has to be something in the setup.....and i dont know what to tell you there......are you using the ems for boost control?

mebcop · 05-28-2008, 08:36 PM

not yet perrin ceramic b/s mbc

onthedwnlow · 05-28-2008, 08:39 PM

why did you not have them tune it on ems bc?......it seriously take 10 minutes to set it up.......if it was over shooting boost it went higher on the boost comp graph where they did not tune.......

mebcop · 05-28-2008, 08:41 PM

But now I turned the boost down to 18psi from 25 and it's still pegging the Uego rich at 10:1 AFR and it bucks and chugs when it goes that rich.

onthedwnlow · 05-28-2008, 08:46 PM

email me your map

onthedwnlow@aol.com

mebcop · 05-28-2008, 08:48 PM

I haven't connected my laptop to the ems since i got home so I don't have it yet.... I'll datalog tomorrow and send you the map and datalog if you don't mind...

onthedwnlow · 05-28-2008, 08:49 PM

sounds good man

never2muchboost · 05-28-2008, 09:36 PM

how long did you have it running when you went with your wife? you might just have not let it warm up enough.if the warm up enrichment is high that will happen.especially if you have low resolution on the fuel map.try letting it warm up for a while then take it out

**lilmike0450** · 05-29-2008, 03:21 AM

^^^^I agree..gotta let it sit for a few minutes and get the juices flowin...Im glad Im finally figuring this shit out...I bet Eric is too...LOL

turbo666 · 05-29-2008, 04:37 AM

Quote: Originally Posted by Aceburner

If everything is working fine then you might want to consider the enviornment u were in when u tuned. I'm not that much of a dyno guy but if you tuned your car on a dyno, I'm sure that when you drive the car on the street, you are going to have different AFR's. I street tune because you get a more accurate tune based on the elements you actually drive in. I may be wrong but I've seen it happen a couple times.

Mustang Dynos provide load just like a car would see on the street in order to give a more accurate tune. They can even account for wind resistance at higher speeds. Every car I've tuned on the local Mustang Dyno the wideband has been exactly the same from dyno to street.

mebcop · 05-29-2008, 05:58 AM

I see what you're saying but the first pull with my wife went good, so I don't think that's the problem. On top of this, on my ride into work today, my idle was hanging up at about 2000rpm. If I added some strain on it with a little clutch, I could get it to settle down to about 1300rpm, but yesterday it was idling at about 950rpms??? I wonder if I have a vacuum/boost leak causing this or if that just has to do with some idle adjustment graphs? I have to wait till I'm done work to fiddle with it, so we'll see. Thanx guys.

onthedwnlow · 05-29-2008, 07:16 AM

im almost 100% sure its a boost leak or something.....something does not seem right