2016 GT Engine Dies at the Track

[ansibe]

I need your help with this one ...

My 2016 GT has a JLT intake and Borla Type S cat back. It's custom dyno tuned by a shop that does dozens of these tunes every year. Between 2015 and now I'd bet they've done >100 very successful tunes.

My first time out with the s550 GT, and the car cuts out after 4 laps. 1 lap warm-up, 2 at speed, beginning of 4th lap the engine dies on the front straight; 4th gear, 6000 rpm, full throttle (duh), ~180km/hr. It's like someone hit the kill switch, the engine is dead and I coast around corner 1 and pull off. NO CODES! After about 30 seconds, I push the starter button, it starts right up and drives normally back to the pits. This happens two sessions in a row, so I quit on safety grounds and head home. Naturally, the car drives absolutely normal on the way home (160 km).

My theories: It can't be the tune because there are 100 very similar cars running perfectly around Toronto. It's got to be ignition or fuel cut. There was no warning or stumbles, it just cuts out ... dead! If it was ignition I think I'd get a code. Could it be the fuel pump cut-off switch in the trunk somehow tripping at speed? Does this switch reset after 15-20 seconds? Why has this never happened on the street?

To add to the confusion, it never cut out on the dyno. We probably did 10+ pulls in 5th, from 2000 rpm to 7500. Of course these runs weren't sequential like track driving. In my 2 hot laps I probably did 30 full throttle runs to redline. That may be a factor.

I have tons of experience at the track - 15+ years, 8 different cars. I've never seen this in any of my cars, so I'd love to hear your theories and fault finding tips.

Thanks.

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[Less Weight]

What are your temp readouts? Maybe the car has some sort of "self-preservation" mode, for lack of a better term. Being that you have a PP with the larger radiator, it shouldn't be overheating so quickly, if it even is overheating, but that is a possibility.

 

[ansibe]

Good thought, but all temps were good, oil and water

 

[jrsimon27]

You should try with the stock tune just to make sure.
The weird thing is that it doesnt give you a cel light.

 

[foghat]

You need to see what happens with the factory tune.

I wouldn't rule out your tune just because there are others on the road. Are they running at the track? How do you know that none of the other tuned cars have't experienced this?

 

[Grim12]

I would ask this question in the road course forum.

http://www.mustang6g.com/forums/forumdisplay.php?f=197

 

[Crossroads]

Sounds like you went into limp mode. Did you hit the rev limiter?

Happened to me at the track on a stock tune. I didn't shut down but had no power for about half a lap,

Heard of others shutting down after hitting it.

 

[Chameleon]

Maybe some bad gas.

 

[Plimmer]

Did you have a 1/4 tank or less gas? My car cuts out after left hand turns with less than a 1/4 tank of gas.

 

[NvrFinished]

Did you have a 1/4 tank or less gas? My car cuts out after left hand turns with less than a 1/4 tank of gas.

Same here. I was going to ask that same question.

 

[Tommy V]

I thought these cars cut off at 155 mph unless changed in the tune.

 

[Coyote Red]

They may cut out at 155 mph as stated above, I've never gotten over 105 because I don't track my pony yet. I'd like to hear more on the issue. Hood pins & aluminum one piece before I track my pony too. Got to be careful. Safety 1st.

 

[MarkH]

Must be one long ass track to hit 155mph in an s550

 

[wildcatgoal]

Did you have a 1/4 tank or less gas? My car cuts out after left hand turns with less than a 1/4 tank of gas.

Mine does to, and it pisses me the flippidy fuuuuuuu off! :frusty::frusty:

 

[wildcatgoal]

I thought these cars cut off at 155 mph unless changed in the tune.

A speed limiter won't shut the engine down, just... well... you won't accelerate any more.

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