Can a tuner turn off...

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Apr 7, 2012 | 05:40 PM

mitchydkid

Thread Starter

Drifting

Joined: Jan 2000

Posts: 1,407

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From: Austin, TX, U.S.A.

Can a tuner turn off...

"Engine Drag Control"
When I am driving at a steady speed my car will repeatedly give the message "Engine Drag Control" and give the engine a little gas. The dealership was baffled because they don't actually know how to trouble shoot anything. I don't actually care to have this feature, so if it could be turned off by a tuner I would be game. I emailed a local tuner and got ignored, so I thought I would ask you guys.
Thanks,
Dale

Apr 7, 2012 | 06:40 PM

ChevyDave

Drifting

Joined: Feb 2012

Posts: 1,796

Likes: 37

From: skiatook oklahoma

Did you put new tires on? Different than standard? note: i read that it should only happen on deceleration, so it giving you gas does sound odd. Tuner cant turn it off, but you can put into competitive mode so it wont complain.

topic... http://forums.corvetteforum.com/c6-z...this-mean.html

http://forums.corvetteforum.com/c5-t...d-finally.html

Last edited by ChevyDave; Apr 7, 2012 at 06:59 PM. Reason: added note

Apr 7, 2012 | 08:06 PM

taken19

Track Junky

Joined: Jun 2007

Posts: 4,074

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From: Orlando Area

Tech Contributor

I started getting this as well on my car, both with track 275/305 combo and the stock 245/285 combo. The computer senses the rear tires spinning slower that the fronts and will blip the throttle to prevent a loss of traction - bad news on the track!

Do you by chance have SS brake lines?

Apr 7, 2012 | 08:24 PM

Zoxxo

Safety Car

Joined: Nov 2006

Posts: 4,023

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From: San Jose California

Quote:

Originally Posted by taken19

Drag control is a function of the traction control system. Turn off traction control and the issue goes away.

Also, hitting the brakes turns off any current drag control event.

To the OP, supposedly a tuner can adjust what the car sees as the "correct" diameter of the tires and thereby change the math that the system uses to invoke DC. I dont know of anyone that's actually done this but, as I said, supposedly it can be handled that way.

Z//

Apr 7, 2012 | 08:35 PM

taken19

Track Junky

Joined: Jun 2007

Posts: 4,074

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From: Orlando Area

Tech Contributor

Quote:

Originally Posted by Zoxxo

I'm not sure that is entirely correct. I went through this for several months and tried everything I could to figure it out. That's why I asked if he was running SS brake lines. I run the Russell teflon coated lines and started having service TC/ABS/AHS problems on the track at about the same time. Just before I blew my motor, I put 6" of fuel line over the SS brake lines at all four corners and the problem did not re-create on the track thru 5 sessions. I used to get this issue at least once per session. I have heard that SS lines can create static and confuse wheel speed sensors.

I may be way off base, but I thought I'd share what I have seen.

Sean

Apr 9, 2012 | 02:05 PM

mitchydkid

Thread Starter

Drifting

Joined: Jan 2000

Posts: 1,407

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From: Austin, TX, U.S.A.

I did a lot of searches and the only other people I found with this issue, as y'all have pointed out, are people who have changed tire sizes. Unfortunately, I have not changed tire sizes so it is something else.
The most common situation for this to occur is when I cruise at 40MPH. If the road is a slightly undulating, every time I crest a rise and there is some (read, very slight) engine drag, the computer blips the throttle slightly to eliminate the drag.

Thanks for your ideas.

-Dale

Apr 9, 2012 | 02:10 PM

mitchydkid

Thread Starter

Drifting

Joined: Jan 2000

Posts: 1,407

Likes: 170

From: Austin, TX, U.S.A.

Quote:

Originally Posted by ChevyDave

note: i read that it should only happen on deceleration, so it giving you gas does sound odd.

Yes, the problem occurs on deceleration. Yesterday, I was going down a fairly long hill. I put the car in 3rd to allow engine braking to control my speed. The result is you start down the hill with engine drag holding you back... DIC gives "Engine Drag Control Active" message and gives the car gas. So during this short event, the car coasts with no engine drag. Event ends and engine drag continues to keep the car from accerating down hill very fast, then the event occurs again, then again... Each time this happens the car coasts, and of course on the hill it speeds up.

This is more of an annoyance than anything, as the computer never gives enough gas to actually make the car take off and the event is brief...about 1 second. If the dealer cannot fix this and i cannot fix or tune it out, I can't imagine how I will be able to sell the car when the day comes.

Thanks for listening.