Originally Posted by DocBeech
(Post 3845041)
the header wont make the egt drop unless its acting like a heat sync. in which case u would need it to be finned. surface area is what cools things down. so you would need to create more surface area to radiate the heat. in turn this would make a hotter exhaust up front so u would also need a heat shield and to make certain its being vented.
your better off cooling the motor, and running a vented hood. my hood has 3 small cowlings over the right rear and u can put your hand over them on any given day to feel the heat being vented. this leads me to believe that while driving, since heats a fluid that takes the path of least resistance and up, that while driving cooling is improved even more. this actually has worked since i have seen an 8-10 degree drop during normal driving conditions. once in a while i get really lucky and it peaks to 15 deg cooler. remember our hoods are insulated and trap heat. the hood i saw on Mazda's rx8 was vented on the edge of the rotary shape. i think they just didn't want us to have to deal with cleaning the vents. plus they covered all the engine parts. why would u cover the battery and protect the alternator then go add insulation to a sealed hood? This hood venting issue has been settled long ago I think. At a stop you might get some benefit but some of the pros have already determined that most aftermarket vented hoods do nothing but upset the airflow at speed. I'm too lazy to search but I even remember reading that the stock side vents are functional for that reason and a vented hood negates that. I looked into this and pretty much learned that on street non FI rx8, it's pointless venting or running a vented hood unless you are just doing it for looks, which if done right can be cool but the CF look hoods are played out IMO. None of the speedsource or other grand am RX8 race cars are running vented hoods. But what do they know anyway. |
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not even Knight Sport, Bergenholt, or BMI racing?
Heres even an 09 model BMI built with a vented hood. https://www.rx8club.com/attachment.p...1&d=1294818578 https://www.rx8club.com/attachment.p...1&d=1294818578 https://www.rx8club.com/attachment.p...1&d=1294818578 https://www.rx8club.com/attachment.p...1&d=1294818578 |
Hood Vents, etc.
There are about four categories of reasons to modify a car:
1) Appearance/Vibe/Ego 2) You like to fiddle with stuff 3) You want to learn the technology 4) To solve a specific problem All of these could fall into the higher level categories of "fun" or "work", depending on things like whether you have another car to get to 7-11 in, how much spare money is lying around, or whether your income depends on winning races. I think most of the regulars on the list work from the POV of the first three most of the time. Eric works from (4) and I for one, am very happy to have him here for that. He has solved, with resources and persistance far beyond what most other listers have, the cooling problem of RX-8s at racing speeds. Are there other solutions or flavors of solutions? Quite likely. However if one's goal is (4), the simplist, most pragmatic, and likely most effective solution is to copy what he's done and *poof*, problem solved. Hood vents: Holding one's hand over a hood vent and feeling air coming out does not mean that they work at 100 mph or 20 mph for that matter. It's very easy to get air flowing the wrong way from effects air flowing around the car at speed. Short of wind-tunnel time, one could buy 25 different hoods and test them on an instrumented cooling system, or take tin snips to a stock hood and punch holes in various places. If one's goal is to cool an 8 at racing speed, an answer has been given. If one's goal is to cool an air-conditioned 8 in a 45 minute summertime Phoenix traffic jam, perhaps not. A vented hood may help there, but also may hurt at speed on a road course. YMMV |
the side vents are not really "functional" imo. cuz look at 09 they just took it away (almost)
vented hood works well, even GT-R has vented hood, stock. it really depends on where the vent is located. |
Doc, are yous seriously trying to compare a four rotor car and other extreme blown cars to yours? :lol: I said, non FI and you post of pics of a four rotor, and some 3 rotor turboed cars. :lol:
Not to mention I don't really consider drift cars on the same level as a race car that is designed to got full tilt for hours. |
Originally Posted by 9krpmrx8
(Post 3845652)
Doc, are yous seriously trying to compare a four rotor car and other extreme blown cars to yours? :lol: I said, non FI and you post of pics of a four rotor, and some 3 rotor turboed cars. :lol:
Not to mention I don't really consider drift cars on the same level as a race car that is designed to got full tilt for hours. Even the one they took to Macau Grand Prix use 13B-REW 2 rotor engine. Next one (this year) they will bring FD back, cuz its much cheaper to build on FD |
Originally Posted by nycgps
(Post 3845457)
the side vents are not really "functional" imo. cuz look at 09 they just took it away (almost)
vented hood works well, even GT-R has vented hood, stock. it really depends on where the vent is located. |
Originally Posted by nycgps
(Post 3845658)
Knight Sports one is actually a Renesis just like ours.
Even the one they took to Macau Grand Prix use 13B-REW 2 rotor engine. Next one (this year) they will bring FD back, cuz its much cheaper to build on FD BTW, is this what I think it is? http://www.knightsports.co.jp/blog/oil_outlet_1_8_2.jpg and http://www.knightsports.co.jp/blog/rx-8mountkit.jpg |
where did you find that?
OD |
Originally Posted by olddragger
(Post 3845675)
where did you find that?
OD Knightsports site, I need NYCGPS to translate :) http://www.knightsports.co.jp/ |
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and This will change the layout of the Radiator into something like a "v-mount" configuration. |
Nice. That adapter for the oil line is sweet, you could get oil pressure and oil temp it looks like. Can you find any pics of that v mount setup installed?
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Originally Posted by 9krpmrx8
(Post 3845681)
Nice. That adapter for the oil line is sweet, you could get oil pressure and oil temp it looks like. Can you find any pics of that v mount setup installed?
Originally Posted by 9krpmrx8
(Post 3845667)
Yeah but the knight sports car is a base to market their products, not really a real race car IMO. Plus, isn't it supercharged? While I love it and love their parts, I don't think they are a true race team building the best car with the best parts.
https://www.rx8club.com/attachment.p...1&d=1294854086 13B-REW swap, at Qualify they tune it to 510 ps, but at the race, they "de-tune" it to 400 ps. because the driver feel its more than enough + much more reliable that way. sadly, when the race start the fucking retarded GT-R behind with their 4wd system accelerate faster(always) but then he lose control and crash Knight Sports 8 + 4 other cars. tons of people in the racing community bitch at him, the driver of that GT-R is a race shop in Hong Kong, Philip Yau, he said he didn't do it on "purpose", yeah right. whatever. FIA gave him a 1K USD penalty for being so fucking stupid. suck it bitch. but ... https://www.rx8club.com/attachment.p...1&d=1294854084 sad ... I was there and the whole team looks very down. |
just wanna say that as much as we laugh about the Civic guys being so "OMG ITS JDM y0!"
some of the Japanese stuff are really ... interesting. Check Autoexe, RE-Amemiya, Fujita and Knight Sports out. those guys are pretty serious about their mods. I have Knight Sports Radiator, its made by Koyo but its not the same as Koyo's "Stock replacement" rad. Its more like a N-Flow(some ppl call it Z-Flow or U flow, whatever) design with ultra thick core (53mm, stock is 38mm, which is a bitch to install), pretty good. (not good for wallet tho) |
:lol: Okay it is a race car but not naturally aspirated :)
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Originally Posted by 9krpmrx8
(Post 3845707)
:lol: Okay it is a race car but not naturally aspirated :)
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You can basically do the same adapter by drilling the head of the stock bolt :) I have had mine that way for 4 years...it works great :).
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Originally Posted by dannobre
(Post 3845716)
You can basically do the same adapter by drilling the head of the stock bolt :) I have had mine that way for 4 years...it works great :).
Yeah I was actually looking at an extra one of those bolts I have laying around and I see what you did. I am going to do it for shit and giggles but I wonder if some styles of the Oil temp probe/sending units would protrude too far in and effect flow. |
thats was what i was wondering too---but if Dan done it for 4 years it must be ok?
Some senders are larger than others--you are also right about that.. dan--how deep does your sensor go? OD |
You have to be careful when you machine the threads....most sensors are pipe threads .....and depending on threaded depth..the hole will allow more or less penetration into the center of the bolt
One I used a threaded bushing to get it in the correct place.....I cut a 1/4NPT hole...and used a 1/8-1/4NPT bushing...and that placed the sensor in the same place as the bolt head used to be. The easiest is a pressure transducer..they don't have a protrusion like a temp sensor usually does |
Dan the man--can you share with us some oil temps you saw coming from the engine?
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Measured where ? Your choices would be pre-oil cooler..post oil pump....seen up to 255 there
Post coolers..pre-engine...seen up to 240 there, but after mods to the oil coolers :) Oil Pan...seen up to 255 there as well.....I think that is the best place to measure oil temp.. Where would you measure more post engine oil temps?......everthing dumps into the oil pan from the bearings and rotors |
Great read with a lot of good info, thanks guy.
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