Motor can't take much more of this. - SRT Forums

Gramaloke · 10-21-2009, 10:16 AM

Spoken with several people about this, hoping others might have helpful input.

MODS:
Stage 1 PCM (Sensors scaled in custom tune)
Delta 44
Fuel return (rising rate)
Stage 2 Injectors
AFRs 10.8
Max Boost 17PSI

porksword · 10-21-2009, 10:50 AM

Looks like the same issue I just had. Your BARO looks low which in my case was a vacuum leak. It caused the A/F ratio to be so rich. If not I would test the MAP sensor next.

duster360 · 10-21-2009, 12:37 PM

Quote: Originally Posted by porksword

Looks like the same issue I just had. Your BARO looks low which in my case was a vacuum leak. It caused the A/F ratio to be so rich. If not I would test the MAP sensor next.

Your sensors aren't Scaled right if at all.
The BARO is VERY low as is the MAP pressure if its truely boosting 17psi.
A MAP of 22.6psi is usually only about 9psi. The jacked up(down) MAP is causing you to have too high of Timing(which you didn't bother to log,,Spark Adjust isn't it) and thats creating the knock.
Since the max P-ratio is nearly exactly what it should be, i think the MAP/TIP are incorrectly scaled and its not a individual sensor issue.

ps, The TIP sensor needs its OWN pressure line to the cold pipe. DO NOT Tee anything off it(BOV,fp reg, mbc, wga Ect),,,or at worse leave it open to the atmosphere.

pss, Next time log these PIDs:What Parameters to Datalog

Gramaloke · 10-21-2009, 02:02 PM

I logged spark cyl 1. Didn't have it checked for that that screen grab tho, so I suppose that doesn't really help. But it's as messed up as you could imagine.

I also had the sensors rescaled by a pretty respected member of the boards. So I figured it must be something else. I've got the entire the log available to anyone with a keen eye and the willingness to help a brother out.

Thanks guys.

duster360 · 10-21-2009, 03:45 PM

Quote: Originally Posted by Gramaloke

I logged spark cyl 1. Didn't have it checked for that that screen grab tho, so I suppose that doesn't really help. But it's as messed up as you could imagine.

I also had the sensors rescaled by a pretty respected member of the boards. So I figured it must be something else. I've got the entire the log available to anyone with a keen eye and the willingness to help a brother out.

Thanks guys.

I don't think its something else. There's a strong likelyhood that the MAP/TIP scale is wrong.
You should send the log to whomever did the MAP scale. Its obvious from the log that something isn't right.
There have been some recent issues with CMR changes not getting properly applied to the original tune file or the new tune file being corrupted somehow. Maybe your new tune has had a similiar issue.

You need to discuss it with the indivdual who scaled the MAP/TIP sensors. Just tell them that "duster360 doesn't think the map/TIP slope got applied to the tune and to be sure to use a Cal file to apply the changes to the original .drg."

ptperformance · 10-21-2009, 05:39 PM

Quote: Originally Posted by Gramaloke

I logged spark cyl 1. Didn't have it checked for that that screen grab tho, so I suppose that doesn't really help. But it's as messed up as you could imagine.

I also had the sensors rescaled by a pretty respected member of the boards. So I figured it must be something else. I've got the entire the log available to anyone with a keen eye and the willingness to help a brother out.

Thanks guys.

Send me the tune file and I will check the map tip scalers. I hope we didn't do it for you

.

Do you have a MSD coil on the car? What are the AFR's? Do you have any spark blow out? The knock is crazy on your data log.

turbo666 · 10-21-2009, 09:24 PM

The file is scaled for 3 bars. There is a sensor issue here.

TDSAaron · 10-21-2009, 09:33 PM

It's pretty easy to determine what is going on for sure. In the tune both MAP and TIP are scaled together. If the scale has been done and you have a BARO that is not right then you can determine which sensor is causing the issue by doing this.

Unplug one of them, either MAP or TIP and then datalog key on engine off. Do not start the engine. For this example we'll say you unplugged the TIP first. If the BARO looks close then plug the TIP back in and unplug the MAP and do the same key on engine off datalog. If the BARO now looks different by a lot then you have found your issue.

I have a feeling that this is not a tune issue but an issue with either one or both of your sensors and or the way they are hooked up. You have a stage 1 computer with the addition of 3 bar MAP AND TIP sensors? If so, what exact 3 bar MAP and TIP sensors are you using?

Gramaloke · 10-21-2009, 10:51 PM

using the mopar 3 bars.

guess im going shopping

TDSAaron · 10-22-2009, 05:49 AM

Have you datalogged them individually like I talked about above? don't just go out and buy two new ones when you can tell which one is causing the problem.

Also, I don't know where you bought the sensors at, but we have had more than a couple guys buy what they thought were 3bar sensors only to find they had stock sensors.