Limp Mode on the Track

[Bossing]

Sebring is 65 and I would assume you can run hard @ those temps.

I'm headed to Sebring soon... have my track day tomorrow.

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[montreal ponies]

Just did a track day at Laguna Seca which I will add to my "Trackaholic's GT350 Experience" thread.

Somewhat pertinent to this conversation are two points. First, there was a second GT350 at the event (a tech pack car), and the driver went into limp mode on his first session. I don't know how hard he was driving, but he implied that he wasn't pushing very hard.

I have a track pack car, and the temps were fine. However, I was way over the sound limit and was keeping off the throttle (I was the first GT350 to go out, and asked for a sound check, and failed spectacularly, so I had to be very careful from that point on, which meant I wasn't on the gas hard at all for the rest of the day).

Also, it was relatively cool @ 64 degrees.

Anyhow, attached is a picture of my temps after a half a lap of cooldown.

-T

Gotta make sure he gets his car looked at by Ford. We need all cars going into limp mode be diagnosed by their dealerships. It's jus sad .

 

[Davy_Baby9]

So this doesn't appear to be a single isolated incident. What's going to happen when it's not technically winter anymore? Summer and fall months? Ha. My aspirations to get a base model keep dwindling down the drain.

 

[Trackaholic]

So this doesn't appear to be a single isolated incident. What's going to happen when it's not technically winter anymore? Summer and fall months? Ha. My aspirations to get a base model keep dwindling down the drain.

If you want to run a high horsepower, heavy car at the track, dedicated cooling is necessary. It sucks that Ford did not include them as standard for 2015 and 2016, but if you plan to track, I'd agree that the base is probably not the appropriate choice, unless you plan to add coolers yourself. That actually could still be a great solution, although it would require some effort.

-T

 

[mattlqx]

Gotta make sure he gets his car looked at by Ford. We need all cars going into limp mode be diagnosed by their dealerships. It's jus sad .

It doesn't register any DTCs. Unless people are datalogging through some external device, Ford isn't going to be able to get any data just from looking at your car after the fact.

 

[mattlqx]

Thanks for that pic. It's starting to look like "the most track worthy Mustang ever built" is going to be a failure no matter what package you have. The tech pack cars go into limp mode after 10 min. and the track pack cars can't be pushed because they are to loud.
:(

Uh, Laguna Seca has a 90db limit most days. That's lower than what a lot of sports cars are stock. It's one of the more sound restricted tracks out there.

Track/Tech/Base cars are all going sound the same so no need to segregate them in that statement.

 

[Spa2k]

It doesn't register any DTCs. Unless people are datalogging through some external device, Ford isn't going to be able to get any data just from looking at your car after the fact.

You don't think the ECU will log a code when the system sees a limp mode condition or related failure?

 

[mattlqx]

I have a track pack car, and the temps were fine. However, I was way over the sound limit and was keeping off the throttle (I was the first GT350 to go out, and asked for a sound check, and failed spectacularly, so I had to be very careful from that point on, which meant I wasn't on the gas hard at all for the rest of the day).

What exhaust mode were you in? Were you in Normal and not at full throttle past the sound tower? Do you recall what rev range you were in running past it?

I would think having the valves closed at 50% throttle running past it in a lower rev area (4-5k) should be okay.

 

[montreal ponies]

It doesn't register any DTCs. Unless people are datalogging through some external device, Ford isn't going to be able to get any data just from looking at your car after the fact.

Are you sure about that ? Will they at least see that the car went into "limp mode", or whatever Ford calls it.
If not, what's the point of bringing your car in for diagnosis !

 

[montreal ponies]

You don't think the ECU will log a code when the system sees a limp mode condition or related failure?

I was thinking the same. :shrug:

 

[mattlqx]

You don't think the ECU will log a code when the system sees a limp mode condition or related failure?

I know mine hasn't thrown any DTCs. I'm not sure if individual modules in the CANBUS can store/are storing any codes. There's an DTC for this.. P1783 Transmission Over-Temperature Condition, but I don't think it's going to throw because the tune is specifically limiting power to prevent the temperature from getting to the point it would throw that code in the first place.

My point is this is a normal function of the ECU tune to prevent damage and probably intentionally doesn't throw a code for this reason.

 

[montreal ponies]

I know mine hasn't thrown any DTCs. I'm not sure if individual modules in the CANBUS can store/are storing any codes. There's an DTC for this.. P1783 Transmission Over-Temperature Condition, but I don't think it's going to throw because the tune is specifically limiting power to prevent the temperature from getting to the point it would throw that code in the first place.

My point is this is a normal function of the ECU tune to prevent damage and probably intentionally doesn't throw a code for this reason.

Well that sucks, even thought Ford is aware of the issue, how are they going to collect data from cars going into limp mode ? :shrug:

 

[mattlqx]

Well that sucks, even thought Ford is aware of the issue, how are they going to collect data from cars going into limp mode ? :shrug:

Ford is perfectly capable of taking their cars to a track and datalogging themselves. I'm sure they were already aware of the limitations.

 

[TRACK CRAZY GT350]

Are you a serious about the sound? Come on man....[

Trackaholic stated he was pulled in for being over the sound limit and could not get on it for the rest of the day. This does limit the experience for track pack cars.

 

[TRACK CRAZY GT350]

Track packs/R!s can surely be pushed. On straights at Homestead, Sebring and PBIR I floor mine like Fred Flintstone. I shift at 8000-8100 rpm (I have my shift lights set at Track and rpm points set at 8k). You can see in my vids I wind it up... no issues. Highest trans temp I have seen is 168*... heck my Z06 hits 210+ trans temp and that doesn't go into limp mode at those digits. I WOT that up too!

Ask the OP.... when I took him for like 4 laps at PBiR, I was moving pretty quick and revving high. With this car the monicker- "don't lift, don't shift" is bang on!

Trackaholic stated he could not push his car because he was called in for being over the sound limit.

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