2011 CTS-V Almost dies when coming to a Redlight. Just moved to warmer climate

[ctsv2011]

Hey guys car was tuned and runs great other then I just moved 1000 miles south to a warmer climate and went to start car off of trailer and car started and almost died and now am noticing when coming to a red light or stop sign the car will almost die (400-500) rpm then will come back up to regular idle I believe at 650. Car is NOT cammed was running great before the move I believe the climate has affected the tune, AFR still in check will attach tune right now just going to jump on laptop real fast

[gtstorey]

I would be looking for issues caused by the ride down on the trailer not the tune. Do you not have summer where you are moving from?

[ctsv2011]

Hey guys car was tuned and runs great other then I just moved 1000 miles south to a warmer climate and went to start car off of trailer and car started and almost died and now am noticing when coming to a red light or stop sign the car will almost die (400-500) rpm then will come back up to regular idle I believe at 650. Car is NOT cammed was running great before the move I believe the climate has affected the tune, AFR still in check will attach tune right now just going to jump on laptop real fast

[ctsv2011]

moved from north dakota they have summer but its definitly a colder climate. moved to oklahoma. problem stated right off the trailer so i figured it would be from the different climate. car is on maf only tune right now.

[edcmat-l1]

Data log will tell more than the tune file itself.

[JayRolla]

Whats the fuel trims looking like? Looks like the VVE table was not really touched on the tune.

[sgod1100]

That a DD tech tune?

[edcmat-l1]

Between the IAT table and the main spark table there is a shit load of timing knocked out of it.

VVE has not been touched.

[sgod1100]

Between the IAT table and the main spark table there is a shit load of timing knocked out of it.

VVE has not been touched.

Not to mention he (tuner) is adding FF timing the higher the cyl. (g) gets instead of having a "waterfall" timing table.

ff timing.JPG

[edcmat-l1]

Not to mention he (tuner) is adding FF timing the higher the cyl. (g) gets instead of having a "waterfall" timing table.

ff timing.JPG

Didn't even look at the FF table. Someone done lost their mind.

[ctsv2011]

Whats the fuel trims looking like? Looks like the VVE table was not really touched on the tune.

From my understanding it's only a maf tune. Vve is disabled I believe please correct me if I'm wrong

[ctsv2011]

That a DD tech tune?

Yes

[sgod1100]

Yes

that's what I thought because he's the only one I have seen set up his ff spark like that....at any rate like previously said get a log of what's going on and some of the smart guys can help you out

[ctsv2011]

I've been told my main spark table has low timing in low load areas comparing to a stock tune. Can you help get me in rough ball park? What is wrong with iat table, and where in the iat table

[sgod1100]

Between the IAT table and the main spark table there is a shit load of timing knocked out of it.

VVE has not been touched.

DD does that shit with his main spark tables too...makes them fall off a cliff under 1ish g. I don't understand why you would do that. Seems like you are leaving a lot of power on the table. Then again, I'm in no way a pro tuner

[ctsv2011]

DD does that shit with his main spark tables too...makes them fall off a cliff under 1ish g. I don't understand why you would do that. Seems like you are leaving a lot of power on the table. Then again, I'm in no way a pro tuner

I'm leaving power on the table in low load areas ? Can you explain my timing tables, it's main spark table plus flex fuel table correct? Why would have a waterfall effect on flex fuel table be better? Not challenging the question just trying to better understand. Thanks

[edcmat-l1]

Still haven't seen a data log.

[ctsv2011]

Still haven't seen a data log.

I'll get one today, been super busy just moved and started new work with a new company. Will get a data log this evening

[edcmat-l1]

I'm leaving power on the table in low load areas ? Can you explain my timing tables, it's main spark table plus flex fuel table correct? Why would have a waterfall effect on flex fuel table be better? Not challenging the question just trying to better understand. Thanks

Main spark plus all your adder tables. IAT, ETC, FF, and anything else that may add or subtract spark.

There's no real reason to knock a whole shit load of spark out of the midrange of the engine. All you're doing is making the engine less efficient. There's no logical reason for the shape of the FF table. And my personal opinion, if you can get 10 degrees of timing in your FF table, you've either gone way past the point of diminishing returns, or you don't have near enough timing in your base table.

Edit: Forgot the screen shot.

Edit 2: Even the low load area is knocked back over 10 degrees. Somebody don't know WTF they're doing.

[sgod1100]

I'm leaving power on the table in low load areas ? Can you explain my timing tables, it's main spark table plus flex fuel table correct? Why would have a waterfall effect on flex fuel table be better? Not challenging the question just trying to better understand. Thanks

The "waterfall effect" effects both the main spark table and the ff table (since it getting added to the main table). You will have MORE power and it will be much more smooth when you accelerated into the moderate/high load areas. Mine is shown below.

ff timing.JPG

Here is the timing difference between your tune and a stock tune. Granted at wot in the higher load areas you will be less than stock due to increased boost. But look at the mid rpm/load ranges. that doesn't even include the IAT timing adder that is pretty high in the stock tune as well.

timing difference.JPG