Street Tune - Z06Vette.com - Corvette Z06 Forum
 
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post #1 of 7 (permalink) Old 04-17-2015, 03:36 AM Thread Starter
sethreign
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Street Tune

I have an 06z with some modifications, mild cam,headers, Vararam intake.

The car has been dyno-tuned, (of course) and makes terrific power (541rw) however, the car needs a more a detailed tune. Anything below 3500 is aggravating. It surges badly due to the ECU flip flopping the timing from 10 to 30 constantly and while it idles fairly smooth, considering the cam, the exhaust smells very rich.

??? I need this tuned on an eddy current for all RPM ranges
??? I was told that the ECU is a Bosch Motronic is this true?

I am in the Southeast, anywhere in GA,FL,AL that has an EDDY CURRENT DYNO would be great. Any suggestions?

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post #2 of 7 (permalink) Old 04-12-2018, 11:31 AM
RoastinZ06
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Re: Street Tune

I am a very experienced calibrator (tuner) located in Melbourne, FL. I design engines and fuel systems for a living (Master of Science in Mechanical Engineering).

I street tune to perfection but also bring customer cars to various dyno shops in the area if needed (typically when the car makes 600+whp and becomes a safety issue). I generally will spend 10-14 hours to get everything perfect. The idle, low throttle, driveability is the difficult part. More than 50% of my business is fixing other "dyno tuning" shops tunes. They charge you $600, strap it down, tune it quick for high throttle (2-3 hours) and shove it out the door. I charge about the same or less and the results are a complete and thorough tune. Let me know if your interested. My info is below.

-John
Roastin Performance LLC
Melbourne, FL
[email protected]
970-402-6118
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post #3 of 7 (permalink) Old 01-20-2019, 09:08 AM
chris.lynn
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Re: Street Tune

Always try to chose an exhaust for your Corvette used to be a compromise between sound and sanity. An aggressive, head-turning note often meant having to shout to your passenger while driving down the highway.
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post #4 of 7 (permalink) Old 03-13-2019, 09:33 AM
Bruno
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Re: Street Tune

Is a misfire on your data log a big deal? Do I need to even worry about trying to correct it or just figure you are going to have x amount of misfires when you are driving your car.

I had my car tuned by a person recommended to me and I think the tune far exceeded my expectations. But I have this nagging thought in the back of my head about misfires still.

My before data was 524 spark knocks 8 misfires 1.2 knock degrees 3.4 max KR.
My after data was 9 spark knocks 4 misfires 3.7 knock degrees 3.7 max KR.

As you can see the factory calibration is terrible. This data log was taken over about 30 minutes, most of it was done at WOT and high rpm loads you would normally never do on the street while driving unless you were trolling for a ticket. So do I need to look at upgrading my coil packs?
Or is what I read about higher voltage coil packs just more crap and the misfire situation is normal?

13 Z06 Blk/Blk Halltech mf103 Corsa sport axle back exhaust custom tune by Team ZR1 533rwhp 463rwtq 48lb/hr injectors
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post #5 of 7 (permalink) Old 03-13-2019, 10:31 AM
racingvette
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Re: Street Tune

Bruno
As you may know there is a Crank Position Sensor (CPS) on the end of crank

The problem with the GM design is the PCM is looking for any stutter via crank and that would assume misfire.
But the fault of design is ANYTHING attached to the crank all the way to wheels, or lifting off gas pedal and then back on it can cause a crank stutter
The PCM does not know any better can assumes it is misfire when in fact it is false misfire as CKS only reports that stutter
Problems are worse as there is 6 misfire tables, hundreds of values in calibration and the counts are in Micro seconds (uS)
That is a very short window, so any drag, could be when shifting, clutch even a rear wheel spin can be seen at CKS and really is false reading as to what the CKS purpose is for misfire

If the check engine light is NOT flashing then there is not a misfire issue and you maybe in tune to this misfire by looking at scanner counts

Looking at just one of the misfire tables on my stock OEM calibration ( which I have not used for years as tuned) you see how little time in uS is allowed.

Code:
	Misfire Max Delta Time (usec)
 
  %VE                                                           RPM
          400      500      600      700      800      900     1000     1100     1200     1400     1600     1800     2000   
    0.0   165.0    130.0    116.0    104.0     79.0     64.0     59.0     54.0     34.0     17.0  32767.0  32767.0  32767.0 
   6.25   159.5    125.0    112.5    100.0     75.0     60.0     55.0     50.0     30.0     18.0  32767.0  32767.0  32767.0 
   12.5   201.0    157.5    140.5    123.0    100.0     70.0     65.0     60.0     55.0     23.0  32767.0  32767.0  32767.0 
  18.75   269.5    201.5    173.5    145.0    111.0     88.0     77.0     60.0     57.0     20.0  32767.0  32767.0  32767.0 
   25.0   336.5    253.0    216.5    180.0    150.0    115.0     82.0     65.0     59.0     25.0  32767.0  32767.0  32767.0 
  31.25   511.0    377.5    281.5    185.0    210.0    140.0    110.0     85.0     60.0     35.0  32767.0  32767.0  32767.0 
   37.5   572.0    423.0    311.5    200.0    240.0    160.0    120.0     90.0     60.0     45.0  32767.0  32767.0  32767.0 
  43.75   663.0    500.0    450.0    400.0    275.0    180.0    150.0    115.0     80.0     50.0  32767.0  32767.0  32767.0 
   50.0   872.0    730.0    595.0    460.0    325.0    220.0    175.0    135.0    100.0     55.0  32767.0  32767.0  32767.0 
  56.25   928.0    800.0    650.0    500.0    375.0    250.0    200.0    170.0    120.0     70.0  32767.0  32767.0  32767.0 
   62.5 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0 
  68.75 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0 
   75.0 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0 
  81.25 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0 
   87.5 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0 
  93.75 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0 
  100.0 32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0  32767.0


So think as you see above that at times only 64 uS window is allowed and if exceeding that short time a false misfire will trigger

Over the years GM has done PCM calibration updates to largely increase those numbers to reduce false misfire counts

If your only looking at the scanner your seeing real and false misfires and stuck on all this

If your scanner records, then why not shoot that to your tuner and he can take a look
But again if check engine light is not flashing then your stuck seeing false when it just should be ignored
Also if this bugs you via a scanner, you could ask you tuner to make changes so the elapsed times even more allowed is changed to larger time windows but if no flashing CEL or hard DTC tripping ignore it and enjoy the car.

If your fuel trims look good, not real rich and your spark-plugs are clean and proper gap, more slanted then to false misfire.

Quote:
Originally Posted by Bruno View Post
Is a misfire on your data log a big deal? Do I need to even worry about trying to correct it or just figure you are going to have x amount of misfires when you are driving your car.

I had my car tuned by a person recommended to me and I think the tune far exceeded my expectations. But I have this nagging thought in the back of my head about misfires still.

My before data was 524 spark knocks 8 misfires 1.2 knock degrees 3.4 max KR.
My after data was 9 spark knocks 4 misfires 3.7 knock degrees 3.7 max KR.

As you can see the factory calibration is terrible. This data log was taken over about 30 minutes, most of it was done at WOT and high rpm loads you would normally never do on the street while driving unless you were trolling for a ticket. So do I need to look at upgrading my coil packs?
Or is what I read about higher voltage coil packs just more crap and the misfire situation is normal?

Mike M - 2001 / 2008 Z06s
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post #6 of 7 (permalink) Old 03-13-2019, 01:11 PM
Bruno
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Re: Street Tune

Thanks for the reassuring answer. The "misfire" is only showing in the data log that the tuner (JR Team ZR1) sent back to me. There are no codes and no CEL light so it is really just me looking at things I don't need to be concerned with. Also I should have known that if JR didn't mention it while we were doing the tuning it was not a problem. He may have, but we covered so much territory, I don't remember that issue.

The winter weather is finally starting to break around here, and I will soon be able to get my car out again. After doing the tune last year and a few other things I din't get to drive the car much. So now seemed like a good time to check all this stuff before it gets to late to do so.

I also happen to be due for a emission and safety inspection in about 45 days and don't want any issues in getting my plates renewed. This will be my first emissions inspection since the tune.

13 Z06 Blk/Blk Halltech mf103 Corsa sport axle back exhaust custom tune by Team ZR1 533rwhp 463rwtq 48lb/hr injectors
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post #7 of 7 (permalink) Old 03-13-2019, 01:58 PM
racingvette
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Re: Street Tune

Bruno

Most counties only use a a OBD-II scanner like you have
So if no DTCs or check engine lights or off the car would pass.

If you switch over to the "generic" mode of your scanner with complies with EPA smog tests
and click on I/M Icon (Inspection/Maintenance) it will do the same tests as a smog shop and give you the result
of pass or fail
This would give you a good idea of tests when you go there

1. Do NOT disconnect the battery, or allow low battery from now to test day or

2. Clear error codes (DTC) as EPA required that either of those done must cause ALL smog tests to default to
a non complete/failed state


If you just do the I/M tests you will see each test results and that way prevent going in and failing
If most are in passed state then your fine.

Yes your correct your too tied to misfires counters but think even a stutter from driveshaft would be seen by CPS and trip bogus counts
I use the same tuner since early 2000s and even my supercharged C5 Z06 with CAM, bigger fuel injectors has passed smog tests with his tunes.

Here is EPA Generic mode, you can do O2 or I/M tests
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Mike M - 2001 / 2008 Z06s

Last edited by racingvette; 03-13-2019 at 02:08 PM.
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