General Supercharger Thread

Truth or myth? Does the SC have to be warmed up when you initially start the truck and before you start driving? If true statement then for how long? What is the procedure if any official one?

 

No warmup. Drive it like normal.

 

No.

I like to put a little heat in the motor itself...so that everything is "wet". ~10 minutes.

doing this has produced healthy oil analysis reports.

 

I suppose that's one positive of being on the sun's surface. It's always warm. Paying attention to the BMW's temps, I learned it is over 100 after sitting for 2 days

 

I like see trans temps above 150 and coolant close to normal operating temp before I "drive aggressively"

 

I let it come up to operating temp before putting it through some hard driving. I know a few trucks back in 2010 on another board had their trucks go into limp mode when getting on it when cold. But some haven't had those issues. Could of been something else?
Edit for spelling...

 

I’m gonna have to dust off and charge the dragy to get a Sniv tuned run on the list!

 

Empty your bed and probably drop 500 pounds there! Haha

 

lol that’s for sure. Also losing time with how much travel it takes to transfer the power but all in fun

 

Spoke to Stoptech, right rotor has been BO for 5 months, they have no knowledge of when it will be available. Cancelled & ordered another left, pads & I’m getting 2 free bolts! woot!


Also, got this history lesson from a vendor:

StopTech manufactured the TRD big brake kit for Toyota, but Toyota owned the tooling for all TRD-specific parts. Thus, the 1-piece 406mm rotors were never made available to StopTech dealers. They must be obtained from a TRD dealer. It's also complicated by the fact that StopTech went out of business at the end of December 2023, so none of these parts will be manufactured going forward. You'll need to find rotors on the shelf at a TRD warehouse or on the 2nd hand market.

The caliper-to-truck mounting bolts are probably the same factory Toyota bolts that were used to attach the OEM Toyota calipers to the Tundra. Almost all StopTech big brake kits reuse the factory bolts to mount the StopTech caliper adapter brackets to the vehicle. Or in the case of the TRD kit, the adapter bracket is actually part of the StopTech/TRD ST-66 caliper casting.

 

I was looking for some info on StopTech BBK kits since the TRD require 20" wheels. Wow, what a rabbit hole that was. Seems big corporations are buying out everything and either closing them down or lowing quality standards. ST was bought out by Centric which is owned by some huge corp. From what I read Centric doesn't even manuf parts, they just source it all from the lowest contract in China. I have been down the Oem brake rabbit hole and knew pretty much that there is only a hand full of manufs that make rotors for just about everyone. Think of it like batteries, the manuf just slaps the buyers name on it, all the same batteries. Seems very few companies still actually make their own stuff, EBC apparently is one of them. Sucks that anyone that needs TRD BBK parts is at the mercy of Toyota.

Also, I know that the drilled holes will be opposite of what they should be, no be deal that I see. But do the rotors have directional vanes or are they straight vanes?

 

I need to look at the rotor I have. The customer service line has 6 groups of parts before brakes.

It's insane

 

I can't see how the difference in a right or left rotor would be noticed.

I put drilled and slotted on my '08. I never gave a thought that they were a right and left.

 

I don't know enough about the specific rotors referenced, but some of the fancy stuff have directional cooling vanes, which would make them rotationally specific for proper cooling.

 

I agree...if you are in the Truck race circuit.

I just can't see the average Tundra owner seeing the difference.

Fwiw, I drag a pretty big RV thru the mountains every fall and spring. I take my braking game very serious. I'm not seeing better performance or adverse wear of the parts. Obviously I'm more confident knowing that my brake components are with in spec.

 

Like wynnded said, if the vanes are directional then it matters for cooling purposes. Doesn't matter if you track it or not. Brakes get hot, hot brakes lead to warping and from the looks of how hard parts are to get and cost, you don't need them getting hot. The whole purpose of BBK is they displace heat faster because of the bigger rotor. Now if it has directional vanes that also aide in cooling better than straight vanes The direction of the holes on the rotor surface supposedly has to be a certain direction but I don't see why. If the vanes are straight then no harm no foul.

 

I think the long term issue is still a problem. You're replacing them now then when the time comes again SOL. I'd be looking at a different solution.

 

That's one of the reasons I didn't buy a used set on eBay. Parts availability is looking dimmer and dimmer as time passes.

 

Agreed, if I was gonna make the plunge your alcons are sweet.

 

That vendor said this about getting the second left rotor.

Good call on the rotor. The largest contribution to shedding thermal energy is from radiation, which is a function of surface area. Convection plays a far smaller role, so I'm not worried about those backwards internal cooling vanes. And with those MASSIVE 406mm rotors, they're not going to get that hot anyway, regardless of how you drive. So the only downside to two LEFT rotors is the aesthetic mismatch from front to back on one side. Unless your rear rotors are smooth, in which case it doesn't matter!

 

I'm no thermodynamicist but I thought in most applications radiation played a very small role in heat transfer. And to back that up, if what he is saying is true then no one would give a shit about internal cooling vanes OR would brake cooling ducts on performance cars exist.

Now whether it makes a difference to you, that's a different story. But my gut tells me that's all bullshit.

 

I have no clue, I contacted them to buy the right rotor, those were the responses.

 

I don’t have time to study brake thermodynamics, so I asked AI for you all as a public service.

Primary heat dissipation mechanism for rotors is convection, secondary is radiation, followed by conduction. It gave a nerdier answer but I’ll spare the unnecessary details.

 

I never took heat transfer, but the equations seem straight forward. Some quick and simple math points to convection doing more with mild braking, and that's using the absolute lowest value from the convection value table this website had, and it's a linear change with the convection constant, if you used the tables value of 1000W/m^2*K instead of 10, then convection absolutely stomps radiation even at extremely high temperatures.

 

So can someone break this down for my knuckle dragging ass?

Directional rotors can not be run on the incorrect side or heat shedding won't occur.

Or the calculations say it's not gonna make much difference?

For sake of argument, let's assume over sized tires will be the only different variable from factory.

No NASCAR situations.

 

I'm no scientist & I didn't sleep at whatever hotel that claims to offer a great nights sleep but I figure ginormous rotors and bigger, more piston calipers are better than smaller ones.

Also, the vanes are directional.

 

So the heat generated by the friction from the atmosphere on the rockets surface...ahh, what he said!

 

Well, the vanes are positioned to force the hot air out, towards the wheel. If it's backwards, then the hot is forced to the center of the hub. For everyday driving, not a big deal as far as straight or directional. Now, towing an RV through the mountains, I would venture say it makes a difference. And if you hot rodding it on the highway then I would say, it also helps. Obviously, like he said they are big ass rotors but anything is possible and heating them up isn't impossible. It would also take a lot more abuse than an OEM rotor, but I am just to OCD and would want the direction to be correct, vane wise.

 

Who do I see about getting royalties from the Stefan Boltzmann constant????