Okay, I'm at my wits end with the performance of my car

For reference, here's a completely stock 2010 SRT8:
http://www.chargerforums.com/forums/showthread.php?t=116301

My best run ever is a 13.650 @ 106.81, DA of 2970, corrected: 13.164 @ 110.835. 60' was a 2.234 (best ever was a 2.204)

I've had Johan at Diablo and Steve at RDP trying to help me diagnose why my 2009 SuperBee takes forever to get moving from a dead stop.

I have two buddies, each with a 2009 SuperBee. One (Joe) has an Airaid CAI and SLP mufflers, no Predator. The other (TJ) has an Arrington 85 mm TB, long tube headers, cat delete mid-pipes, Flowmaster mufflers and a Predator running the Perf 91 CAI canned tune with some fuel added to eliminate the KR. Mine has the Airaid CAI, no cats, Zoomers cat back, and an email tune by Steve.

So, a quick recap. Joe can easily smoke the tires with ESP fully enabled. TJ can as well, plus from a dead stop (ESP still fully enabled) and stomping on the gas pedal can spin the tires into second and chirp going into third. Mine struggles to get the wheels to spin with a brake stand (almost bald tires). We've swapped cars, and TJ's revs and runs like an animal. Mine struggles to wind up from a dead stop until gets to about 4000 rpm.

Johan inspected some of my logs and based on the fuel trim values he saw, suggested I had an intake leak of some sort. Myself and TJ inspected the intake and exhaust and found zero leaks. My next course of action is to pull the intake manifold off and inspect it.

Steve and I have been corresponding a lot during this process as well. I thought an email tune wold wake the car up. It hasn't. Steve mentioned I look into having the camshaft degree checked after logging and tweaking the tune. If things are not correct (retarded), he's seen the car very lazy until almost 3800 rpm. A symptom my car has always had from day one.

So, does anyone else have any other suggestions? I'm currently not working, so I'm only able to pursue inexpensive options at the moment.

Such as:
using the TCM and/or stock TB from TJ's car
having the dealership reflash the PCM with the stock programming
inspecting the intake manifold, perhaps gasket/o-ring misplacement
? ? ?

 

Can you send me the log? [email protected]

 

Your times look fairly normal for the track DA...very similiar to my local track DA....the 06 Charger SRT8 I had would run 13.5s stock with ~2.1 60'...............if the car is sluggish you maybe need to remove the battery cables for 20 minutes or pull....what # fuse was that?....been awhile for me..:dumb:............

 

Logs sent

Fuse #11, I believe. And I've reset the adaptives, unhooked the battery, and pulled that silly fuse a few times. No change in the car's behavior.

I have an oil change scheduled for tomorrow morning and I'm gonna make sure they know not to "program" the car with any new software as that will render the Predator useless.

I'm working on a mounting plate for my McKinney catch can as well. Just in case anyone suggests I get one. :bigwink:

 

I would venture to say the adaptives need to be reset?

As Larry suggested, remove the negative side of the battery for 15 min or so... Or pull fuses 11, 14, and 16 (I think>)...

You should never base performance from one car to another (especially if the information is coming from chargerforums lol). as each car runs differently.

I would think that a vacuum leak would be evident during a data log session? In any event, to check the intake manifold for leaks, spray some carb cleaner at the intake/head meeting place (while the motor is idling). You will find a vacuum leak quickly with this method.

Also, do you have a catch can? Have you checked the PCV Valve (replaced?)? You might have a more than normal oil blow-by into your intake and the catch can will greatly reduce the blow-by.

 

You can reset and all that but it will not help with your problem! Your problem is the tune point blank and period! Get a tune from anyone other then who did your last tune and your problem will be solved it is what it is! So my advice is get a tune form Josh at HHP. Problem solved!

 

I am going to agree that your times are pretty standard....

are you saying your 60' are getting killed by whatever the issue is?

 

That was just another example. I would think that after correction, a mildly modded (CAI, exhaust, email tune) should be able to out-perform a completely stock car.

Here's a better one. On the night when I ran my best (as mentioned above), I ran against two other 06 SRT8's that night. I managed to beat them off the line both times and in the first 60' and especially at the 330' mark both had caught up and passed me, and pulled on me all the way down the track. These are equivalent in upgrades (CAI, exhaust, tune).

Yes, I believe the lackluster "get up and go" is the cause for poor 60' times. The car will not go until it hits around 4000 rpm.

It also seems strange to me that a stock SuperBee (before Joe added the CAI and mufflers) kept up with ease and pulled on me a couple of times.

Like I said, we've driven each others cars. There is a noticeable difference in my car compared to theirs at the beginning.

 

all depends my brotha...

and dont be so sure about a factory car...some cars have more hp from the factory...some have less....some are "factory freaks"...just depends lol...unless you and your buddys cars were made one two and three in line at the same factory in the same day...they are gonna be pretty different.

I had almost the EXACT same mods as tony and he pulled 14 more HP than i did just from small things in the tune....like ron said...each car has its own personality and tuning isnt something that can be done one time and its over....a good tune (especially one over email) can take months to perfect.

Try throwing in the 93CAI tune and just do a compare and contrast....

 

Johan is 100% correct. Looks like you have a vacuum leak of some kind. What mods do you have?

Once you reload the tune it resets the fuel trims.

Remember fuel trims are just for part throttle. I would get a wide band o2 and see what your fueling actually is. Maybe you have a o2 issue.

 

i just throw the back pressure factor out there. a bad exhaust setup could possibly be a factor, i would also try cutting that out of the equation.

 

yeah I know i lost some low end torque when I cut everything out and just put in some flowmasters due to a loss of back pressure but it was a conscious decision for the sound i wanted

 

The tunes I was logging were based on the Perf 93 CAI tune.

Airaid CAI (with scoop), 170º tstat, cats removed (pipe welded in) and Zoomers cat back.

We sprayed carb cleaner around the whole intake manifold and such while the car was running. No change in idle during that process.

When I had the cat's removed (by the way, the car ran the same way before, now I just have more sound) the tech checked for exhaust leaks and none were found. No fuel smell is observed either.

 

Get a wideband in there and lets see what the fueling is doing.

 

13.1 is about what you'd expect with that car with a tune? Clayton's gripe is that he can't get out of the hole. Car feels like (and apparently does) bog/sluggish in the 60'. That about right?

 

Ever throw a misfire code?

 

Yes Dave, that more or less covers it. Although, I've heard of these basically stock cars running 12.8's at sea level, but that's with a great launch and a prepped track.

As I said, the car takes it time winding up to 3500/4000 rpm. After that it's okay fore the most part. I can compare it's performance to about 6 other SRT8's with equivalent mods. Each of the others can leave a black stripe off the line and spin all the way into second. I get a slight chirp off the line and then it seems to "think" about winding up before it gets going.

No codes whatsoever.

 

It's on my list.

 

Did you check your brake booster hose and PCV valve? How about the plate on the bottom of the intake manifold? Throttle body gasket?

 

Throttle body gasket: yes.

Intake manifold will be pulled off as soon as my buddy can come over. He knows better what to look for.

Brake booster hose?

What about the PCV valve????