mrhemi wrote:
Normally I would not even reply to this thread as it has degenerated into the continual mudslinging so common on this board and others. But let me reply to Napabavarian with my observations regarding thermostats.
First off, after purchasing a CRD knowing full well it's eccentricities I began to research a replacement Tstat. Lets not debate he short comings of the OEM yet again. I decided on Jeff's product for my CRD. Yes his small business has teething problems, but the product was received as advertised and has been working flawlessly for 25000 miles. I have recently purchased another CRD for the fleet and have one of Jeff's Tstats on the way. So, I am satisfied with the product to the point of purchasing another, in spite of all the arguments against.
Price? Yes they are expensive, but you are getting a very low production volume, quality piece.
Cost of OEM vs HDS? Yes, you can purchase an OEM for about 1/3 the price, but you will be changing it again, and possibly yet again. My time is valuable as well, so there is hidden value in the more expensive long term solution.
Reliability? I don't expect one of these HDS stats will ever fail given the quality of the components, but if so, the thermostat itself can be procured almost anywhere in stock and changed out with a minimum effort. Not so with an OEM, it would have to be ordered, even if it broke down in front of a Jeep dealership. This reliability is important for myself and my wife.
The modified OEM? A solution as well, but here is my perspective. I have a lathe, mill and HF tig unit in my shop. Probably even have enough billet stock to make the modifications from. Everything to mod my own. Again, my time is valuable, when I can purchase a well designed and manufactured component ready made instead of fabricating / modifying something, I will. Something to keep in mind with this as well, although I have not heard of issues as of yet, is the metallurgy of the OEM casting and it's suitability for welding on. The ratio of old Budweiser cans in the casting is unknown from batch to batch.
Increased operating temperature over OEM? Keep in mind that Chrysler went to the expense of installing a viscous heater in the cooling system to get the coolant to the heater / defroster up to a temperature that would actually do some good. In the 200 deg range the engine operates more efficiently, albeit produces more NOX per gallon of fuel, however now uses less fuel to accomplish the same amount of work. Recently I was using my CRD to get to a work site, 60 mile drive one way, each day. With the GDE tune and OEM stat operating at 176 deg. I could make 3 round trips to a tank (fuel stops were sparse). This was for 5000 miles. When the HDS stat was installed (with no other changes) the higher operating temperature increased mileage to allow for 4 round trips to a tank. a gain of approx. 30-40 miles per tank. This was verified over an additional 25000 miles. The engine also runs much smoother, quieter and appears to produce less particulate soot due to more efficient combustion, although I have no definitive measurement of soot without an opacity meter.
So Napabavarian, make your decision as you see fit, but your original question was regarding the product itself and I have provided you with my personal experience and observations. No mudslinging allowed.
Cheers,
mrhemi
This analysis is very succinct. Can I work around Jeff's thermostat? Yes. Is Jeff a kook? Yes (sorry man, but you need to lay off and let your customer's tout your product) Is the HDS001 expensive? Yes, but so it my fuel pump harness, my intake plumbing, my battery tray, my lift, my sliders, my 4-link, and nobody bashes those products. Is the HDS001 quality? Yes, undoubtedly. Is there a benefit to the HDS001? Yes. Do it once, and then t-stat changes are no big deal, and I have heat within a mile (maybe less) of my commute. Is my time, Jeff's time, and the benefit, worth the cost? YES! All the other benefits are speculative, but I don't care. Running hotter is probably better. The flow is probably better, but who cares. If I ever have another CRD and I am still in a cold climate, the HDS001 is top of the list for mods.