Street traction problem with open rear??

[NHDude4]

Not sure if a lot of people drive it like a Prius here but yes, this is consistently a problem. Just last night I was making a left turn at a stop sign and only mildly accelerating in the rain it spun up the left rear. I was thinking how much more I'd benefit from a limited slip rear end. If you really get on it it'll break both rears loose which is fine, but when you're turning and accelerating it'll spin up the inside rear. The solution is to put it in 4A in the wet. Any time one of the rears is getting enough power to spin power us sent forward and you never spin.

It's NOT true that the the traction control system acts like a LSD. It will reduce power to control spinning and if you start losing control the system will brake individual wheels to regain control. What it won't do is apply brake to a spinning rear to act like a limited slip. This would have been the best solution to the problem. I don't like using 4A when I don't have to because it makes the steering heavy off-center.

 

[Greg Gobin]

Ease up on the skinny pedal when it’s raining and you won’t have any problems, if you can’t bring yourself to that put it in slippery mode and it won’t give you any problems

 

[jondle]

I'm always trying to get less traction. How can I get this a little sideways? One wheel spinning...give it a little more gas to break the other loose. You bought a raptor.

In all seriousness, what Greg said. Drive the results you want. If you get a little spin on a corner in the rain, no big deal, ease off a bit until it stops. If you are drag racing in the rain, 4WD. Heavy rain or standing water, 4A, but that isn't related to cornering traction; it is to help with sudden changes in grip and very little weight over the rear.

Ease up on the skinny pedal when it’s raining and you won’t have any problems, if you can’t bring yourself to that put it in slippery mode and it won’t give you any problems

 

[KTag98]

The traction control system can mimic a limited slip.

This. It uses the ABS system to apply brake pressure on the “free spinning” wheel to force power to the other wheel, and visa versa. Much faster, and more “versatile” than a LSD as far as slippery pavement is concerned. That said, I would occasionally get a little bit of one wheel fire on my 1st gen.

 

[LVGH]

Thanks to all for confirming my concern. I drive a BMW X5 suv with twin turbo V8 and full-time AWD. It has more power than the Raptor and I never break it loose even turning while accelerating from a stop. Not sure I'd be able to give that up. LOL and Raptors are a little pricey to have as a second vehicle.

 

[The Real Coolbreeze]

gggrrrrrr...... yeah. Thanks for pointing out, YET AGAIN, that my truck doesn't have that nifty 4A setting like my old plain jane f-150, so now I live way up a windy mountain road with lots of ice for 3-4 months out of the year and rainy wet moss for 6 of the other months and I have NO 4A Choice! Just 2H and 4H, and the old 4L which ain't for the faint of heart on hard ice.

My shiney arse hole stealership dude told me, when questioned about the difference in the buttons, " nah, not to worry. The Raptors are different and the 4H works just like your old 4A did. You'll love it! this thing has more bells and whistles than you can shake a stick at!" and I with dewy eyes full of raptor, believed him. Now we're heading in to winter and my truck DOES NOT feel as sure footed in 4H as the old truck did in 4A....

 

[DANACO]

gggrrrrrr...... yeah. Thanks for pointing out, YET AGAIN, that my truck doesn't have that nifty 4A setting like my old plain jane f-150, so now I live way up a windy mountain road with lots of ice for 3-4 months out of the year and rainy wet moss for 6 of the other months and I have NO 4A Choice! Just 2H and 4H, and the old 4L which ain't for the faint of heart on hard ice.

My shiney arse hole stealership dude told me, when questioned about the difference in the buttons, " nah, not to worry. The Raptors are different and the 4H works just like your old 4A did. You'll love it! this thing has more bells and whistles than you can shake a stick at!" and I with dewy eyes full of raptor, believed him. Now we're heading in to winter and my truck DOES NOT feel as sure footed in 4H as the old truck did in 4A....

I find 4A is pretty impressive, better in almost all cases than 4H. What I don’t like about it is a slight vibration at about 2300 rpm, my 15’ 150 did it as well, anyone else’s do that ?

 

[NHDude4]

This. It uses the ABS system to apply brake pressure on the “free spinning” wheel to force power to the other wheel, and visa versa. Much faster, and more “versatile” than a LSD as far as slippery pavement is concerned. That said, I would occasionally get a little bit of one wheel fire on my 1st gen.

What you're describing exists on many performance vehicles and is indeed as good or better than a LSD when properly calibrated. I'm not sure why people think the Raptor has it though. I regularly get spin from my inside wheel when accelerating from a stop while turning. The truck isn't doing anything to prevent it. There's no brake actuation sending power to the other wheel. A simulated LSD via ABS would prevent any significant spin of the inside wheel. The Raptor simply doesn't have this.

 

[FordTechOne]

What you're describing exists on many performance vehicles and is indeed as good or better than a LSD when properly calibrated. I'm not sure why people think the Raptor has it though. I regularly get spin from my inside wheel when accelerating from a stop while turning. The truck isn't doing anything to prevent it. There's no brake actuation sending power to the other wheel. A simulated LSD via ABS would prevent any significant spin of the inside wheel. The Raptor simply doesn't have this.

The Raptor does have torque and brake based traction control, but the thresholds are high. It requires a significant amount of wheel spin to engage the system in normal mode; when it does you’ll see the traction control light flash in the IPC. I believe the thresholds are lower in Slippery mode, but that automatically puts you in 4A. If it’s raining hard and I’m in any conditions that may require quick acceleration, it’s in 4A. And it still has enough power to break all 4 tires loose in the rain and get sideways should you so choose.

 

[NHDude4]

The Raptor does have torque and brake based traction control, but the thresholds are high. It requires a significant amount of wheel spin to engage the system in normal mode; when it does you’ll see the traction control light flash in the IPC. I believe the thresholds are lower in Slippery mode, but that automatically puts you in 4A. If it’s raining hard and I’m in any conditions that may require quick acceleration, it’s in 4A. And it still has enough power to break all 4 tires loose in the rain and get sideways should you so choose.

Yep the system works well to correct a loss of control but what it does to handle regular straight-line wheel spin is just cut power. If you're accelerating and your left rear is spinning it won't brake that one with full power to move power to the right rear.

It can definitely break all 4 loose in the wet. With a Stage 1 tune mine spins all 4 in the dry when launching.