[MartinLe]

Sorry if this if off topic, but I posted it on the general forum and had only one response. I notice that the handful of "heavy hitters" I used to see over there are absent but are active here.

Anyhow, I have noticed that the car has been idling high - 700 commanded, ~860 indicated. I brought this up to my dyno guy and he said he noticed it. He also said the torque tables at idle were showing a negative value, and that might have something to do with the high idle. Or, maybe a small vacuum leak. No CEL showing.

No one has tuned this car other than Jannetty. How can the torque tables be negative? No one would purposely tune that in, would they?

Any thoughts would be appreciated.

[Joshinator99]

Originally Posted by MartinLe

Sorry if this if off topic, but I posted it on the general forum and had only one response. I notice that the handful of "heavy hitters" I used to see over there are absent but are active here.

Anyhow, I have noticed that the car has been idling high - 700 commanded, ~860 indicated. I brought this up to my dyno guy and he said he noticed it. He also said the torque tables at idle were showing a negative value, and that might have something to do with the high idle. Or, maybe a small vacuum leak. No CEL showing.

No one has tuned this car other than Jannetty. How can the torque tables be negative? No one would purposely tune that in, would they?

Any thoughts would be appreciated.

Torque model has to be correct. Torque equals airflow plus timing. So if torque isn’t right, then the car closes the throttle blade and reduces timing to get things in line. If it still can’t do it, it’ll even make the timing go negative to achieve its desired target.

You first need to be 100% sure you have no mechanical issues like a vacuum leak. Once that’s good then you need a tuner who understands VVE and VT tuning. There’s a lot of good tuners out there like Elite, GPI, etc but KingLT1 knows his stuff so he gets my vote on remote tuning ten times out of ten.

[MartinLe]

Thank you, sir. Of course, you are one of the "heavy hitters" I was referring to. I will have it smoke tested and go from there. I will reach out to King once I know the mechanics are sound.

Again, thank you.

[Joshinator99]

Originally Posted by MartinLe

Thank you, sir. Of course, you are one of the "heavy hitters" I was referring to. I will have it smoke tested and go from there. I will reach out to King once I know the mechanics are sound.

Again, thank you.

Well thank you, much appreciated. I had to learn this crap the same way everyone else did…the hard way lmao! But you’ll get squared away soon enough.

Tuning these cars is pretty crappy unless you do it everyday of your life haha. You essentially tune them three times…MAF scale, VVE, and torque tuning. PITA!

[shinysun]

If I were you, I would use 'reset the throttle' function in VCMscanner first.

[KingLT1]

Look at your fuel trim and spark data at idle. If you have a vacuum leak the fuel trims will go extremely positive at idle. If the timing is negative then it could be the VTT needs adjusted. Either way 700rpm idle seems low for a rough idle cam anyway. 800-850 is probably where that cam really wants to idle.

[MartinLe]

Originally Posted by KingLT1

Look at your fuel trim and spark data at idle. If you have a vacuum leak the fuel trims will go extremely positive at idle. If the timing is negative then it could be the VTT needs adjusted. Either way 700rpm idle seems low for a rough idle cam anyway. 800-850 is probably where that cam really wants to idle.

It is getting smoke tested today. We can go from there if you are so inclined.

Thank you for your thoughts.

[MartinLe]

Originally Posted by KingLT1

Look at your fuel trim and spark data at idle. If you have a vacuum leak the fuel trims will go extremely positive at idle. If the timing is negative then it could be the VTT needs adjusted. Either way 700rpm idle seems low for a rough idle cam anyway. 800-850 is probably where that cam really wants to idle.

No vacuum leak (smoke tested). What do you think is the next step?

[KingLT1]

Raise target idle to 800. Then look at spark advance and see what it's doing at idle. If it's negative then your VTT needs work. Also look at fuel trims. Should be +/- 5%. If long terms are still enabled, shoot for -2 to -5%.

[JANNETTYRACING]

Originally Posted by MartinLe

Sorry if this if off topic, but I posted it on the general forum and had only one response. I notice that the handful of "heavy hitters" I used to see over there are absent but are active here.

Anyhow, I have noticed that the car has been idling high - 700 commanded, ~860 indicated. I brought this up to my dyno guy and he said he noticed it. He also said the torque tables at idle were showing a negative value, and that might have something to do with the high idle. Or, maybe a small vacuum leak. No CEL showing.

No one has tuned this car other than Jannetty. How can the torque tables be negative? No one would purposely tune that in, would they?

Any thoughts would be appreciated.

I had answered your email several weeks ago but didn't hear back from you.

No one can look at torque tables and say whether they are right or wrong because there are way to many variable to take in to account and many of the tables do have negative values this is normal.

Having negative timing numbers doesn't necessarily mean there is anything wrong it is how the computer controls torque.

I was never alerted to Idle speed vs commanded because all of your logs are driving logs and you never mentioned it.

Your feedback during logging session is crucial the more details you give the better the result.

Remember you are my eyes and ears while driving.

Looking back at emails we tuned the VVE, then MAF and TQ tables.

Give me a call with any questions. 203-753-7223

Ted,