RomRaider

I've been running and tuning my 07 for quite some time now.
The car drives great. Smooth as can be just about everywhere.
Ran a 12.2 @ 115mph the other day.
http://www.getadomtune.com/forums/viewtopic.php?t=154

However, just a couple problems that I've seen on many 07's.

Issue 1
Post start enrichment. Holy crap. With big injectors, the cars run like 8 or 9 AFRs upon start up until the enrichment decays. If you tune out the start with huge maf changes or injector scaling, everything else is hosed.
My belief is that maybe the post start enrichment isn't just a percentage, but maybe an actual pulse width programmed into the ecu.

Any help on getting post start enrichment tables found would be awesome. I know of 4 cars that suffer this. One is a accessport car tuned by Tim Bailey. So it's not just me suckin' on this one. Apparently COBB doesn't know the solution either.


Issue 2
That wacky boost delay. It's like 2 seconds of lower boost, THEN the car decides to try and hit target boost. IF I'm on the freeway around 3500 rpm +/- a bunch (it has a wide range) and I punch it, the car sits for about two seconds, then the wastegate duty pics up and the car tries to hit target boost. However, the delay is really annoying. It really screws you up in town traffic too.

Have you possibly ran into anything that would affect this? I'll try to get some logs and see if there is enough data to show it.


Thanks for all the help guys.

The startup one is kinda embarrassing. Makes my car jump and smoke for a few seconds. Like it's busted or something. When it's just a ass ton of fuel making it miss.

nothing?

Issue 1:
Load and/or air flow may be determined by table (rather than MAF) post-start when there's insufficient ECT for closed loop. Log CL/OL status and see if the problems clear up once the ecu enters closed loop.

Issue 2:
Never heard of this one before. I would log target boost, turbo dynamics integral, turbo dynamics proportion, pwgdc, throttle opening angle%, boost error, rpm. You need to obviously narrow down what is the issue that is causing the hesitation as it could be anything. If the above looks ok, then look at timing/fuel/throttle(aoa v. tpoa) to see if maybe the 07s are doing something unusual when you have this issue.

as soon as the front 02 goes active, it clears up. On a hot restart it's only about 15 seconds away.

I'll log the boost thing. It's really weird. Sometimes it's only half a second of lower boost, other times it's like three seconds.

log 'cl\ol fuel status' for issue 1. A value of 7 indicates 'open loop due to insufficient coolant temp'. If when it switch to closed loop 8 from 7 and your issue is cleared up, then check load and airflow during the next start and see if they are being calculated differently before and after.

I'm afraid I don't completely understand.

Every hot start it does this until it goes CL. The 02 sensor will display a value when the car is warm and the sensor is warm. However, for the first 10-15 seconds, the car won't have any fuel correction, the car mis-fires and AFRs are in the 9's.

I'm going to get some logs so you can see what I'm talking about. I'll try and get the boost shizzle too.
Thanks for your help.

I'm talking about the latest logger RomRaider definitions. There 4 modes to CL/OL fueling and logging the 'CL/OL fuel status' parameter will indicate the current mode. It is possible that air flow and/or engine load is being calculated post-start via table (referenced by ECT) rather than the MAF sensor during this period.

alright partner, I gotcha.

Ok. Here is a log. I literally JUST NOW, changed my injectors on my car to see if I had one that was messed up. The new injectors flow about 100cc less and haven't been scaled for. The old injectors were 900cc, these are 800cc. With a learned trim of +25%, the car still falls rich on a hot restart. If I reset the ecu, it still does it with 0% learned. So it must be what you are saying about a preset map.

In the log you'll see the cylinders misfiring and the AFR very rich. Also, I got the OL/CL thingy you were talking about. 7, then switched over to 8 and that's when it got cleared up.

Here's the log:

I'm in the car right now with the laptop.
I'm going to go get some boost logs as soon as I get these injectors rescaled.

what is mode 10?

IF I try to hold 2000 rpm, the car jumps between 8 and 10 on the OL/CL and when it's 10 the car runs lean (injectors aren't totally scaled yet). Still sitting, this isn't driving.

now my car isn't learning at idle.. what the hell did I do to it? LOL

here's another. I'm getting the scaling closer, YAY.

You can see how bad the misfires were on this one. No learned correction whatsoever, but you can also see the duty cycles decay down to what they should be at idle.

Thanks again.

10 is normal open loop. If you are hitting open loop in nuetral (other than the initial post-start 7) then you have some other issue. Likely you have too much enrichment at lower loads in your fuel map. When your CL delays are set to zero, the ecu uses your fuel map to determine the CL-OL transition so you want to make sure that you have no enrichment (14.7:1 effective AFR) at load/rpm where you should not be in open loop.

8 is normal closed loop. 7 is open loop due to insufficient coolant temps (i.e. right after a cold start until the front o2 is ready).

well I have plenty of 14.7 on my fuel map in all the suspect areas and surrounding. It does it a lot when going slow at light throttle settings. Like first or second gear at like 2% throttle around 3k rpm. cars bucks a little.. 10, 8, 10, 8, 10 as it goes in and out.

Hmm, strange. I don't think anyone else has reported an issue like this.