Wheel hop under hard acceleration

Kansas66 · November 24, 2014, 01:06:03 AM

I bought a 2011 taurus sho about a month ago. two weeks after I bought the car a bearing in the ptu went out. I replaced the ptu myself as I am a ford technician. When I bought the car the temperatures outside were in the 60's and it would launch hard with no problems. After I got the car back the temperature outside had gotten significantly colder. Now when I accelerate at wide open throttle from a dead stop in a straight line or turning the car has wheel hop. I am wondering if this is normal for the cold weather or if something could have been screwed up while replacing the ptu? I had both roll control mounts and the rear subframe bolts out to replace the ptu. The car is completely stock as far as I know.

panther427 · November 24, 2014, 01:24:13 AM

Sounds fairly normal. Cold weather makes more power and rubber harder on the tires. I notice wheel hop more in cold weather personally

IHeartGroceries · November 24, 2014, 01:54:18 AM

I agree, I'll bet it's the colder tire/road surface.

let's hear more about the PTU replacement. You didn't have to drop the front subframe? Did you happen to take a peek inside the failed ptu? Or look at the oil in it?

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SHOdded · November 24, 2014, 05:06:08 AM

Another good reason to have engine/tires warmed up before going WOT

Maybe someday in the future they will monitor tire/surface temps also! What tires? How much tread remaining?

X2 on more info re: the PTU replacement.

And, by the way, welcome to the forum! Do create an intro thread for yourself here:
http://ecoboostperformanceforum.com/index.php/board,14.0.html

SHOnUup · November 24, 2014, 07:28:53 AM

Very normal, coming from a tuned SHO I can say. Cold weather has put a stop to brake boosting launches for sure. Also getting the tire hop when shifting into 2nd from an aggressive take off. Love the power created from the cold air, but need a well prepped surface to take full advantage of.

Rich

SHOnUup · November 24, 2014, 07:29:48 AM

Quote from: IHeartGroceries on November 24, 2014, 01:54:18 AM
I agree, I'll bet it's the colder tire/road surface.

let's hear more about the PTU replacement. You didn't have to drop the front subframe? Did you happen to take a peek inside the failed ptu? Or look at the oil in it?

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X2 on the details!

Rich

Kansas66 · November 24, 2014, 01:33:46 PM

The PTU replacement wasn't as bad as I thought it would be. The rear of the subframe has to be lowered and the engine has to be raised a little bit. I didn't look inside of old ptu but I can tell you the fluid was black and was very thick almost paste like.

Thank you for the input on the wheel hop issue. I guess I was just worried that something was wrong with the new ptu or transmission.

IHeartGroceries · November 24, 2014, 03:05:24 PM

Good to hear that it wasn't too bad. Just lowering the rear of the front SF is a whole hell of a lot better than having to drop the entire thing.

The report on the fluid is pretty disturbing, but seems to be the common denominator with failures. Even owners who've performed PM and swapped out the putty...er...fluid have all reported essentially useless oil in the unit. I think it is safe to say that after so long (not long at all), the factory fill becomes essentially useless, burns into nothingness and basically loses 100 percent of its viscosity.

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EcoPowerParts · November 24, 2014, 06:35:16 PM

Coilovers will make a huge difference with this issue, just FYI even at stock heights due to adjustable shocks.

SHOnUup · November 24, 2014, 06:43:53 PM

Quote from: 4DRHTRD on November 24, 2014, 06:35:16 PM
Coilovers will make a huge difference with this issue, just FYI even at stock heights due to adjustable shocks.

These have been moved to the top of the parts list after fighting the hop this year. Thinking front and rear linkage and some heavy duty hubs to finish it off too.

Rich

Kansas66 · November 24, 2014, 07:50:49 PM

Update: I had my car on the hoist tonight after work to do an oil change and decided to inspect a few things and noticed both the rear shocks are leaking and I checked my tire pressure and all of them were down about 4 psi. I am wondering if either one of these issues could contribute to my wheel hop problem?

Somebody asked what kind of tires I was running. To answer the question they are goodyear eagle rsa's. and are better than half tread.

panther427 · November 24, 2014, 08:54:12 PM

Rear shocks have been a common issue recently. Not a fan of that tire personally.

painterpatt · December 27, 2014, 08:39:27 PM

That 1st to 2nd hop scared the crap outta me the first time lol. Was sure I broke the tranny.

southtxSHO · December 28, 2014, 02:19:55 PM

Quote from: SHOnUup on November 24, 2014, 07:28:53 AM
Very normal, coming from a tuned SHO I can say. Cold weather has put a stop to brake boosting launches for sure. Also getting the tire hop when shifting into 2nd from an aggressive take off. Love the power created from the cold air, but need a well prepped surface to take full advantage of.

Rich

I've been noticing this right after the exhaust upgrade . The 1st to 2nd gear shift feel very aggressive .

SHOnUup · December 28, 2014, 03:49:38 PM

Quote from: southtxSHO on December 28, 2014, 02:19:55 PM
Quote from: SHOnUup on November 24, 2014, 07:28:53 AM
Very normal, coming from a tuned SHO I can say. Cold weather has put a stop to brake boosting launches for sure. Also getting the tire hop when shifting into 2nd from an aggressive take off. Love the power created from the cold air, but need a well prepped surface to take full advantage of.

Rich
I've been noticing this right after the exhaust upgrade . The 1st to 2nd gear shift feel very aggressive .

Yes, feels horrible when you get that dreaded hop. The main reason I'm going coilovers, linkage, wheels and tires before any more power add ons.

Rich