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This is excellent! Very good job! Keep the data coming!

Also, can you post a scatterplot with the datapoints color coded according to which roof produced them? And then overlay the regression line against the scatterplot. Would be nice to see how the datapoints group or don't group around or to either side of the regression line.

Thx! Can't wait for more.
 

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This is the best thread EVER! :clap: :clap: :clap: :nanner: :nanner: :clap: :clap: :clap:


Semi-tangent to the earlier tangent.... Shoco: I had considered another option, and with you and APK in the same place I thought it would be a good time to bring it up.

Do you think it would be beneficial to run the roof scoop to the airbox (where the snorkel currently enters)? Then one could take Shoco's side-inlet kit to improve airflow over the intercooler, and the roof duct could then be used to provide cool, clean air to the airbox.

I've looked at my engine bay a bit and even with the i/c installed it seems like there is enough room for a few bends and flex pipes to run the plumbing and it shouldn't interfere with opening the hatch either. The airbox doesn't need a massive amount of air going to it. It just needs access from which to pull cool air, and enough of it circulating around. Just curious as to whether or not you think this is a good idea, based on both your experiences in evaluating airflow through the roof scoop.

And Shoco, any plans to make a kit which will work with the rls intercooler? I'm very interested.



Back on topic: keep it coming! Can't wait to see the data after the fettling is done, to see if it makes a diff.
 

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Smoky, I love this idea, if it's doable. I'm having the Proalloy chargecooler installed (Sector 111 is using my car as the fitment test mule). I'm thinking, hmm, now I've got this scoop on the roof in cool air doing nothing. Maybe I can direct the flow into the airbox. Would it f up the fuel/ air ratio I wonder?
I don't see why it would. It's basically the same thing as placing a filter into a cold-air position (like AEM does with other cars). Except in our case one is bringing the cold air to the airbox, rather than placing the airbox (and an open element) into the air (such as a fenderwell).

No pressure change would occur. Just the air source. And any rain that would enter the scoop would get trapped on the sides of the ducting and evaporate long before it reaches the airbox entry.

The engine would get the same amount of air as before, just ambient temp air. The ECU is well able to adjust for air at ambient temps flowing past the MAF. That would not be a problem.

It would just a be a cleaner, cooler source of air. If anyone knows someone who could take the OEM hood scoop bellows and mod it or use it as a template to create a modded version, one that captures the scoop air and funnels it down to a port, then the next few steps (tubing/plumbing to the airbox) would be fairly straightforward.

Perhaps we could pool resources and make it happen. Test it on our cars. See if it makes a difference one way or the other.




apk the graphs are fantastic! Really clear data. Very, very cool to see someone going through with real data collection. You're a true Mythbuster!

Any chance of throwing in the non-cup roof (Exige S) into the data? Do you still have one available?

Thx for the great reporting!
 

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Nice work, 2 things I would add, first have a stainless heat sheild made to go between the IC and the engine to remove the heat soak from the engine, second the problem with making the roof scoop into the air filter duct will come about when you try to remove the old ducting from the clam, it is bonded on. I considered this after I fitted my charge cooler and then dropped it after fitted the Lotus Sport uprated airbox as I felt that mod would then have no benefit.
That's great except I've been waiting for Lotus (via FVMC) to get back to me. I've been begging, pleading with them to let me spend my money there. They seem to have earned all the money they can handle, because Lotus doesn't seem to want my money, or to sell me parts. They never call back. Not once in 3 months of asking.

When you say "bonded", what do you mean? I thought it was just adhesed/glued to the surface, which would seem reversible. Are you saying it is not reversible, and the ducting is permanent? That seems odd. Or maybe we're talking about different things?
 

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time to decrease temp across speed per temp drop would make for some interesting comparisons. Looks like you have the data for it already (that was about a 40 min drive, if I read correctly). Plenty of stops/gos in there too. Those kind of comparisons would be good benchmarks for comparing differences in heatsoak/dissipation for other intercoolers.

At the end, was that just sitting at idle, where the speed=0 and the temp continues to rise?

Might I recommend you connect with Thomasio from rls? It would be great to throw his rls intercooler into the mix of your data collection. I think a lot of people would benefit from the knowledge of how changing the intercooler does/does not impact heat soak and charge temp.

And also, of course, to test Shoco's side-intake cooling kit. What a difference that would make for folks to see the end results of these kits.
 

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So what effect does blocking/redirecting the side intakes have on engine cooling? Anything at all? At a glance it seems like these side scoops may be the only source of cool air for the motor. But there may be more getting through the engine bay then I realize.

Great data apk.... Now you need to stick a sensor on each intake, scoop, and duct. :p j/k would be cool data though.

You are really covering a lot of the most interesting readings... great job!!

PS: What was actual baro pressure outside during the run?
 

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Would love to see pics and a writeup of how the fans are located, installed, and wired-in to function. Are they always on when the car is running? Are they strapped to the i/c? Or elsewhere? Do the fans replace the function of the roof scoop, or supplement it?

I've seen several references to using fans on this forum but have never seen evidence of anyone actually doing it.

apk: where exactly are you sealing the duct? it is difficult to tell from the photos. From what I can tell, there is a bead of silicone on the inner lip of the body-portion of the scoop (as opposed to the roof scoop, which appears to be removed in your pics, with the photo showing a view into the body-portion of the scoop). If you have a moment, could post a few more angles, and then maybe an external pic showing arrows pointing to what exactly is sealed? I just can't tell if you're improving the seal of the roof scoop to the body scoop, or if it is a better seal within the body scoop and has nothing to do with the roof scoop.

Thx!
 

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Those fans look great! They seem like they could work well...especially with a push-pull setup like that. At the very least heat soak should have much less of a bite.

How loud are they, since you do mention that sometimes they are "unwelcome" in terms of noise? Not asking for db specifically, but just your impression of what they add to the overall cabin noise over the usual motor & s/c noise, at idle and at speed..


How do the fans attach to the i/c? I can't quite see what is holding them in place.

Thanks for the great pics and info! I may have to look into this. Looks very doable, and combined with the RLS it may be just enough to really take the bite out of the heat at the track and during city driving.
 

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Sweet data. Depressing, but great to see it logged. :)

Wondering if the rls i/c made the condition "less worse" than with the oem i/c.

Hook up some fans to that thang, and rerun that test. See if it helps! :D Cuz from your data it looks like the best upgrade is just to get rid of the i/c!! lol That doesn't seem right, but data doesn't lie (it can be wrong, but it never lies).
 

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Obviously the charge cooler is "the" solution to lower temps.

Unfortunately the current chargecooler offering is way too expensive and way to difficult for the average enthusiast to install. And since not everyone lives down the road from a top-notch Lotus aftermarket specialist, it is just plain out of reach for the majority. I've even read a few complaints that the chargecooler isn't doing that great a job either, as well as complaints that the chargecooler radiator prevents the primary radiator from receiving the cooling air it needs to do the job of releasing heat from the coolant.

If someone would introduce a production (ie. not "one-off") chargecooler system that was completely contained and installed in the engine bay, THEN we'd really have something.

Until such a product arrives, just saying "use a chargecooler" is a cop-out. I'm much more interested in this research towards air-to-air cooling. We're not saying air-to-air will ever produce BETTER results than water cooling, but the search for the most OPTIMIZED air-to-air cooling is what we're after. It is obvious the OEM solution is not optimized. That's the goal, IMHO.
 

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Beside...who drives a Lotus on the street? :shrug:
rotfl Even though you are (hopefully) joking that is the oddest question I've heard all week. Maybe all month. This one's a keeper.

Lots of -poke- round here. I like reading data.. It's more funner.
 

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Well, since Lotus now sells an Elise which is supercharged and they don't even bother to put an intercooler on, I think that answers your question. The bottom line from all this testing is that there simply is not enough airflow through the "mail chute" at the top of the clam (or the back of the roof that connects to it) to allow the intercooler to do it's job and prevent heatsoak. So roof on/ roof off ultimately doesn't matter (regardless of what the salesperson at the dealership tells you). You're just gonna lose a bit of power once everything gets hot.
They are using different s/c's in the s/c Elise. It is smaller, and doesn't *NEED* an intercooler (but should still have one, based on forum reports).
 

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+1 to dmh's comments. External spraying of any kind will not pass tech inspection at most sanctioned events.
 

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Robains, you are comparing intentionally introducing liquid onto the track surface (via spraying) vs unintentional oil/coolant/etc fluid dispersement from a mechicanical problem. Doesn't quite add up.

Dmh is just trying to save you a turnaround at a tech inspection. Maybe you've passed, so far.... you've been lucky. But I would not want to race on a track with a car spraying water all over the place. It's just irresponsible (for you to do it, and for me to race with you if you do spray).

Safety first. Performance second.
 

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:clap::clap::clap::clap:

This post gets better everyday. Can't wait to see the deltas against the stock i/c. Great work!!
 

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Direct comparison Stock vs RLS. and those variables across roof type (cup vs Exige S). Has that been done already? If so, linky please. I haven't seen a direct comparo yet.
 
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