ericnewcom
Well-Known Member
JP6-HDSS ordered! With the 5.13s, this ought to be a new truck.
Sounds like it'll be a nice setup. I plan to do 5.13s too when my stock 33s need replacing and I step up in tire size.
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JP6-HDSS ordered! With the 5.13s, this ought to be a new truck.
I seen in a different thread roughly 3lbs. The CF is heavier but a smaller diameter which causes the pro mass to have more inertia.ACT what's the weight difference from my CF to your pro mass?
ProMass is 40.8 @ 11" diameterACT what's the weight difference from my CF to your pro mass?
Google calculator doesn't take into account where the mass is. The 11" vs 10.4" is clutch disc size. You would need to compare the two assemblies including the pressure plate and disc for each to get an accurate value. Without testing on our inertia tester, I would just say they are comparable, and I huge increase over standard JL/JT parts.ProMass is 40.8 @ 11" diameter
CF is 43.8 @ 10.4" diameter
Google calculator says Pro Mass has more inertia given the wider diameter.
Been running the lighter spring for about a week now. I only had 2500 miles on my JT when I did the swap so my factory spring was still really fresh. So far I, prefer it over the factory spring. The most notable positive is at the very top and very bottom of the pedal stroke there is no longer the drastic "slapping" action that is more obvious in Dirk's video of the pedal assembly off the vehicle. This makes for a much more consistent pedal feel and I can detect the clutch engagement point a bit better. Only downside from my perspective is the spring is lighter and makes the overall feel of the clucth slightly lighter as well. But we all know the only solution for that problem. I like perfer my clutches feel like I'm pushing on a diving board. Overall very nice easy install and budget option to improve driveability.Clutch Assist Spring Testing
From a recent clutch installation on a Gladiator with 62K we were able to get more testing done and gain more data points to consider. First, we focused a lot on the pedal assembly and testing the assist spring.
Installation is super easy. If you don’t like it, take a couple minutes, and change it back. You may want to change it a couple times just to be sure you are not imagining anything in your analysis.
I am not saying that this will solve the OE clutch issues of the JL/JT, but maybe this will improve the driving experience with the stock clutch.
The difference between the JL hydraulics and JK hydraulics (what CF adapted for the JL) is the cylinder piston size. The JK hydraulics move the clutch arm further than the JL but otherwise of the same construction. By adapting the JK hydraulics CF now has enough travel to operate their clutch.Hey ACTman (and other contributors/guinea pigs ),
Appreciate all the info! One thing I am still curious about is why, if anyone knows, CF did decide to change to change out the hydraulics with their kit, and (directed more toward you) why ACT deemed it unnecessary.
I've read through the few main threads regarding the recalls and your clutch kit, but that's one thing I haven't seen be discussed. Admittedly, I haven't watched any videos yet, so my apologies if it's covered there and I missed it!
@udrugby09 i have a little over 6K on the ACT clutch and Pro-Mass fly wheel, and i can say it's without a doubt one of the best improvments over stock that i have done to the JT (thats my youtube video review above). ACTs increased clamp load for torque capacity and heat capacity will be a great match for towing and traveling, especially with the added flywheel inertia. As mentioned in the review with normal hand tools the swap is pretty straight forward and is flagged for 5.5-6 hour install by shop. Ideally you'll want the ability to support the trans and tcase as a whole to save alot of time. Check out ACT's youtube playlist tab and they have a category called "ACT Clutch Installs" that has a step by step how to with torque specs. Let us know how it works out for you. I absolutely love my ACT upgrade, not only is is peace of mind over the stock unit, but it's also comforting knowing it all engineered to work with the OEM equipment rather than requireing additional aftermarket components. For reference, mine is the JP6-HDSS-HD-O/Perf Street Sprung (479 ft/lb w/ Pro-Mass)Appreciate the quick reply! Should have just done my homework and watched your videos at home tonight lol.
I was just about to start ordering parts for a lift & tire upgrade on my Overland before deciding I should look into the clutch recall first... esp. adding more rolling resistance with hay season just about in full swing where I'd be further pushing tow cap!
Not having to swap those parts out AND having an installation video is huge; I'm no experienced mechanic, but I'll DIY things I can do in a weekend. Being on crutches now I may be outsourcing that work, but I'll save on both parts & labor with your kit either way!
Also nice not to worry about Stellantis potentially gimping performance to maintain EPA numbers if/when a real fix and parts become available. Something tells me the Sep 2023 estimate is a little optimistic... and I've got way too much towing and traveling to do while I wait. From the sounds of it (besides obv. safety concerns) it solves the only complaints I've had about driving it, so I'm really excited.
Thanks again!
I think you misunderstand. The total inertia of the flywheel and clutch is what prevents stalling, which is reduced on the JL/JT compared to the JK (and ACT of course). The engine characteristics don't change if it is single mass or dual mass. What changes is downstream of the engine, with the clutch and transmission.In an ACT videos I noticed two different flywheels available. Has anyone tested the lighter one yet?
My stock clutch at 58K is fine but the dual mass flywheel has got to go.
One of the ACT videos clamps the flywheel/clutch in a lathe and demonstrates it rather well.
For a truck, the dual-mass gives you the worst of both worlds. A low mass off idle flywheel and heavy flywheel at rpm.
Another point ACT mentioned was the dual-mass allows solid center discs they reducing the disc assembly rotational inertia(syncro life). Any info on the ACT disk inertia vs stock?
I installed the ACT clutch with the Promass flywheel today, and when I drove it away, the slave cylinder blew. I hope a new one last a while.Hey ACTman (and other contributors/guinea pigs ),
Appreciate all the info! One thing I am still curious about is why, if anyone knows, CF did decide to change to change out the hydraulics with their kit, and (directed more toward you) why ACT deemed it unnecessary.
I've read through the few main threads regarding the recalls and your clutch kit, but that's one thing I haven't seen be discussed. Admittedly, I haven't watched any videos yet, so my apologies if it's covered there and I missed it!