Fuji4
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Has anyone reflashed their 3.0SC V6 aka Tune?
- Thread starter Fields Carlisle
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16FujiDisco
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https://www.roverparts.com/engine-cooling/water-pumps/PEB500010/
This one appears to be the same p/n but a plug-n-play option?
This one appears to be the same p/n but a plug-n-play option?
Fuji4
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Could be. Call them and ask about the harness.
This is more of a theoretical question than anything, but...the intercoolers on this LR4 puzzle me to begin with, and I'm curious what this electric pump gains you over stock, @Fuji4 ?
I don't know how much boost these engines actually are getting from the supercharger, but if it's in the neighborhood of 12PSI or so, I'd expect the boosted intake charge to be at around 220 degrees, or about 30 degrees over the coolant temperature. And from my cursory look at the intercoolers, it sort of looked like the system cools in the same way people used to blow a fan across a block of ice before air conditioning: not very efficient.
The turbocharger truck I had had a big intercooler in front of the radiator, with a lot of ambient-temp airflow over them.
I don't know how much boost these engines actually are getting from the supercharger, but if it's in the neighborhood of 12PSI or so, I'd expect the boosted intake charge to be at around 220 degrees, or about 30 degrees over the coolant temperature. And from my cursory look at the intercoolers, it sort of looked like the system cools in the same way people used to blow a fan across a block of ice before air conditioning: not very efficient.
The turbocharger truck I had had a big intercooler in front of the radiator, with a lot of ambient-temp airflow over them.
Fuji4
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how deep do you want to go?
thats the compressor map for the supercharger. Rpm x pulley ratio gives you charger speed. There is obvious diminishing returns from a cooling system that pumps a higher flow rate through the same sized cooling surface area (the front mount intercooler) because of the time component thermal loss over a given surface. With two pulleys I am at the edge of the map at redline rpm where the charger is least efficient. Heat soak does become an issue. For my purposes I chose not to get into pv=nrt and all that and trust the guys at VelocityAP and superchargersonline (engineers or para) and a few cobalt ss and jag forums (anecdotally) and their combined understanding that a higher flow pump would be better, to a point. That combined with the fact that the VAST majority of my needs is torque from 2000-3600 rpm. Which is pretty much below the “totally inefficient charger” zone. And also it’s a cheap part to swap. So why not? I have not dynoed it because I don’t care enough andseat of the pants and VelocityAP dyno testing is enough for me.
16FujiDisco
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After doing some more digging, i've found that the aux pump pre-MY15 is different than the '16 MY. P/N for '16 is LR095160 and looks like
, but prior years P/N is PEB500010 and looks like
(which is the Bosch upgrade that @Fuji4 alluded to)
I'll have to do a visual inspection to verify that my '16 has the stumpy pump
I'll have to do a visual inspection to verify that my '16 has the stumpy pump
Last edited:
So, you're saying LR downgraded the pump between '15 and '16?
Stuart Barnes
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Heat soak would be my big concern here as well, it would be interesting to see the difference between the capacity of the radiator/heat exchanger for the supercharger on these v6’s to the v8’s in the Range Rover and which pump they used.
But as you say, keep away from the diminishing returns at the extremes of the pv graph and it’s not an issue.
Stu.
well it looks like it’s the same part number as the sport v8 so you’re probably squeezing as much out of it as you can
Thank you, @Fuji4. I confess I don't know how to read that map, honestly. And I didn't know there was an existing electric auxiliary pump as part of the stock plumbing.
I gather that this pump was only part of your overall upgrade, which included changing the pulley ratios for the SC, as well as some other reflash? If so, did you do it in stages so you could say that the seat-o'-the-pants feel actually was contributed to by the improved cooling of the intake charge?
I gather that this pump was only part of your overall upgrade, which included changing the pulley ratios for the SC, as well as some other reflash? If so, did you do it in stages so you could say that the seat-o'-the-pants feel actually was contributed to by the improved cooling of the intake charge?
Fuji4
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I did it all at once. And the pump is a kind of “cross your ts and dot your Is” kind of a thing. It would not be noticeable in most driving situations to the seat of your pants even though It may be functioning. For those tuning this SC for track use in a jag or cobalt ss or whatever they are looking for peak performance. For me I see blazing hot temps in CA and NV in the summers. Potential slow and go traffic. Towing up hill in the sierras for long distances (probably highest likelihood of heat soak). Etc as being reasons I might run a hot air charge. Thus for $150 bucks of possible prevention, it seemed wise.
