I think most of us understand how FD1 & FD2 work, but what about the Caliber? Anyone know how they differ?
Jeep 4WD system vs Caliber R/T 4WD system
nth256
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I'm willing to bet it is exactly like the FDI system with the exception that you can't lock 4x4 in.
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I would still think that it would have BLD, and would function the same as the patriot/compass. The programing would be exactly the same.
I would've thought so, but i caught a couple YT videos of some guys drifting in snow-covered parking lots, and another guy at the beach, and it looks like their system is locked in 4WD.
Judge for yourself:
Beach sand:
Frozen parking lot:
Whatever it looks like from videos you would be wrong. Before my Patriot I drove a Caliber and when I was getting that car I had a chance to drive an R/T with all-wheel drive. It did NOT have 4x4 lock--it was strictly AWD biased to the front wheels. I also did not have the same ESC either. I believe it shares some components with first-gen FD I (the CVT one, not the one in the current model with the Magna system and Hyundai automatic). However compared to my Jeep you could tell it was tuned very differently.
In snow the Patriot with CVT-based FD I is considerably more capable than the AWD Caliber R/T. Further to that the AWD Caliber was discontinued a number of years ago, and you can get a 4x4 patiot much newer. Either would work well enough in on-road poor-traction, but for deeper snow/mild offroad you really should go with the Jeep--Caliber may be good, but Jeep is better.
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Not even the FDI patriot has BLD, that's only available on the FDII patriot. so that's another difference there.
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But it does have traction control, which will either cycle a brake caliper (BLD) or reduce engine power (which is why we have drive by wire gas pedals). It's essentially a very un-aggressive BLD, same as when FDII models are in Drive vs. Low/Off-Road mode.
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According to Wikipedia, BLD is offered in FDI as well.
Where is the proof that the BLD is more "aggressive" in FDII over FDI. All my research shows it's just folk's opinions.
The only real difference in the FDI and FDII I've seen is FDII incorporates a new version of the CVT with LOW range capability.
Correct me if I'm wrong (with Facts. Not opinions).
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I remember reading somewhere that the BLD are in both FDI and FDII, but when the FDII is locked into "off road" the BLDs are turned more aggressively. and I can attest to this myself, doing a lot of off road, there is a HUGE difference in when the blds kick in in D 4x4 and L 4x4. I will try to find where I read it.
The cvt between FDI and FDII is exactly the same. its the final drive that is different only. So when you shift into "off road" or L, it forces the cvt to stay in lower gears longer, and not go as quickly into the Higher gears for fuel economy. Its kinda like if you were to drive with the auto shifter, and keep it in 1st and 2nd gears, and let the engine rev to redline before shift, but at slow speeds, not accelerating. The big difference is the gear ratios with the final drive. The loweset gear "first" in a FDI I believe is a 14:1, and in the FDII is a 19:1 because of the final drive. and that's why the FDII doesn't get as good fuel economy. I don't know what the top gear ratio is for either, but because of the final drive on the FDII its "geared" lower, so it runs at higher rpms. its LIKE if you had a 6 speed transmission, and the the FDI has a typical with typical gears 1, 2, 3, 4, 5, 6, and the FDII has gears like 1/2, 3/4, 1, 2, 3, 4. (I know that the cvt doesn't have gears, and it is continuous, I'm just trying to explain it best I know how)
From Wikipedia:
Off-roading capabilities[edit]
The Freedom Drive II-equipped Patriot uses a continuously variable transmission with a low range instead of a traditional two-speed transfer case, but has Jeep's "Trail Rated" badging, signifying that it "has been designed to perform in five categories of off-road conditions: traction, ground clearance, maneuverability, articulation, and water fording." The Freedom Drive II[2] Patriot is among the most off-road-capable vehicles in its class, in part due to specialized anti-lock braking technology that Jeep describes as 'Brake Lock Differential'. This allows the vehicle to maintain forward motion if one or two wheels lose traction by selectively and aggressively applying brakes to the spinning wheels. This is an improvement over other conventional on-road orientated AWD system; a vehicle intended for on-road use with open differentials only would be stranded if there was a loss of traction in one front and one rear wheel at the same time. The BLD is also standard in The Freedom Drive I, although it is less aggressive than the BLD found in Freedom Drive II Patriots.[2] options.
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So there basically "programmed" a bit different on how the BLD locks up then correct ?
Also, the MKs now have a different version of the CVT. Not sure when that happened. Just read it in the literature
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for 2014, MK's get a hyundai 6 speed automatic, and no longer have a cvt. the FDII models still get the cvt.
all BLD's are is traction control. All cars that have traction control have a similar operation. FDI's are just a bit more off road oriented, and the FDII when put in off road mode are tuned to be even more dedicated off road. I think if they were as aggressive on road, they would cause you to crash, as they really grab that spinning wheel. but when you are going 2-5mph, it gives you more control.
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I read that as well. IMHO, I think that is the author's "opinion" who wrote the Wikipedi article.
We'll have to go with folk's "real world" experiences with driving the different FDI/II.
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I just found all the gear ratio numbers in a Buyer's Guide I have here.
I'll post a new thread on it. Don't want to h-jack this dude's thread and get carried off topic.
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Another easy way to think of it, is that all FDII patirots and Compass's with the exception of the different gear ratios, function exactly the same as a FDI patriot or compass, only when in the 4x4 locked Low mode is there a difference BLD wise.
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