Some one comes to term and actually measure the temp of the vented hood and normal hood. :cool: The Re Amemiya wet carbon hood was used

Labrat stop your comment NOW!

This are the points they are recording (no explanation required)

http://www.rx8club.com/attachment.php?attachmentid=51682&stc=1

These are the results (I have attached some easy translation)
Download here (http://www.step-hen.com/rx8/result.jpg)

Enjoy

By the way, it is a 25 degree day in Japan and full throttle can go up to 130 in oil temp and 91 degree in water temp.

RENESIS IS HOT!!!! :(

OK now what does all that mean in terms of how much quicker I can get through maccas drive through? :D

It will mean a cooler engine on the way to get your big mac at full throttle. But only a cooler engine BAY when you are waiting for your big mac in line :rolleyes:

You call that purposeful vented hood...?

I think not!

http://givemealook.com/ipw-web/gallery/album507/100_6118

http://givemealook.com/ipw-web/gallery/album507/100_6118

Love that hood LOL :D

I am sure it will work 2 as good and 7ps gain :p

All I am saying Taka is that it is unwise to replace a critical body component (the hood) which has been specifically designed to minimize trauma to pedestrians in case of impact. The book we received about development of the RX-8 described the hood design in detail, and why it was designed that way. As a pathologist who sees many road trauma victims, you cannot help but applaud such a feature. If you have data which demonstrates that this plastic hood has been tested and produces the same or superior safety outcomes as the stock hood, then tell us about it. OK, the temperature under the hood may be lower, but how do you equate such an advantage against the possibility that the replacement may cause more accident trauma (including head injuries)?

Taka, please accept that I don't mean to lecture you, but being a health professional places you in a position where your every utterance on just about any subject which may impact on human health or even life has to be carefully considered. In saying that it doesn't excuse those of us who aren't in the health industry from not thinking about safety first. In this country, cars are the most readily obtainable deadly weapon, and their effect is demonstrated every day.

ehhh.... you lecture is very sound.

As a pathologist who sees many road trauma victims, you cannot help but applaud such a feature.....
how do you equate such an advantage against the possibility that the replacement may cause more accident trauma (including head injuries)?

But I will be out of business without those idiots killing people :D
Yes more work for me :rolleyes:

taka, you're awefully concerned about engine temps suddenly. Care to elaborate? Seems to me Mazda designed the 8 following extensive previous experience with rotaries (where cooling, especially on FI versions, was a problem --- yet I've not seen much on this in relation (NA) 8's)...have you had a problem?

Not suddenly, I always says Renesis is still too hot. That is why I have a 2nd oil cooler for the track days. Mazda Japan (yes the people who design the RX-8) enforced owners to have radiator upgrade and oil cooler addition before racing in their event. And their race only goes for 15 laps! :eek:

Your mazda rotary OIL start to degrade at 130 degree C. If only a little fang in Japan's spring will get the oil temp up to 130. What will happen after10 laps in a race track?

I am sure you don't want to change engine oil everytime you do a fang on a quiet road.

If the engine temp is that unsatisfactory in NA mode, what will happen with a bolt on FI?

That is all :rolleyes:

All I am saying Taka is that it is unwise to replace a critical body component (the hood) which has been specifically designed to minimize trauma to pedestrians in case of impact. The book we received about development of the RX-8 described the hood design in detail, and why it was designed that way. As a pathologist who sees many road trauma victims, you cannot help but applaud such a feature. If you have data which demonstrates that this plastic hood has been tested and produces the same or superior safety outcomes as the stock hood, then tell us about it. OK, the temperature under the hood may be lower, but how do you equate such an advantage against the possibility that the replacement may cause more accident trauma (including head injuries)?

Taka, please accept that I don't mean to lecture you, but being a health professional places you in a position where your every utterance on just about any subject which may impact on human health or even life has to be carefully considered. In saying that it doesn't excuse those of us who aren't in the health industry from not thinking about safety first. In this country, cars are the most readily obtainable deadly weapon, and their effect is demonstrated every day.

if u are so worried about the health of pedestrians... why not just change to a primus instead, im sure the pedestrians will be much safer that way :p

quick question....
who keeps their engine cover on :confused:

I keep it on.......the garage wall

quick question....
who keeps their engine cover on :confused:

Okay, I'll play the dummy - I keep it on. Care to elaborate on the pros and cons??

Okay, I'll play the dummy - I keep it on. Care to elaborate on the pros and cons??

the cover suppose to direct the hot air to the side vents, all it does.... apart from keeping the engines nice and tidy...

but i think it makes the engine bay look like as it's made up of cheap plastic
and i have mine off btw, coz i have the ms tower bar

the cover suppose to direct the hot air to the side vents, all it does.... apart from keeping the engines nice and tidy...

but i think it makes the engine bay look like as it's made up of cheap plastic
and i have mine off btw, coz i have the ms tower bar
same here! Not regret. The MS tower bar is 10X better and IT IS FUNCTIONAL FOR SURE :D LOL

quick question....
who keeps their engine cover on :confused:

Eric is it.......??

I know plenty of RX-8 guys that leave it in the garage as it trap too much heat & makes the engine bay look tacky

Eric is it.......??

I know plenty of RX-8 guys that leave it in the garage as it trap too much heat & makes the engine bay look tacky

yes David....
just a quick question for those who are worrying about the un-vented factory bonnet and engine bay temp.
i think my engine cover is either on the top of my tool table, kitchen corner or the storage room at the workshop :o

But there's been no reports (that I can find) of temperature-related failures... :confused:

And if Mazda designed the engine cover to deflect heat out the side vents, might you not risk the new heat flow (without the cover) progressively damaging the bonnet -- esp the paint finish -- over time??

I have certainly noticed the heat flowing from the side vents when walking around the car after a run. :confused:

Did you notice, Taka, that the congested driving temps of the oil and coolant were EXACTLY the same with either bonnet. This shows that the Mazda design guys have engineered the car correctly for everyday conditions. Whilst the underbonnet temps were up with the std bonnet, the radiator and oil cooler(s) did their job.

Underbonnet temps are not all that critical unless you're racing and trying to grab every last hp. This car has no return line to the fuel tank, so fuel heating is not such a critical hp issue either.

Gomez.

My engine cover remains on the car......

By the way, it is a 25 degree day in Japan and full throttle can go up to 130 in oil temp and 91 degree in water temp.

RENESIS IS HOT!!!! :(

Don't panic chaps! 91c is NOT hot for the water in a car engine. :cool:

Depending on the age of a car, it will use a combination of systems (including thermostats, chokes, fixed or electric fans, management computers, etc.) to get it up to an optimum working temperature.

And this does NOT mean as cold as you can practically get it. For a variety of reasons engines run best when running what sounds fairly hot to us. A typical operating temperature would be in the 95C general area.

And just because it runs at 91C when the outside temp is 25c doesn't mean that it will run 15c hotter when it's 40c outside. It will just require the management system to make adjustments to keep it within the desired range.

We think 91c sounds hot because we're used to water boiling at 100c. But remember that the coolant in you car will NOT boil at 100c, if it's working properly because:

a) It's under pressure (yes, that's why your car has a pressure cap on the cooling system. The more pressure the higher the boiling point. You can't make a cup of tea at the top of Mt Everest because the water starts boiling at much too low a temperature to make a decent cuppa. :mad: )

b) The "coolant" we use (known as antifreeze in some countries) does several jobs - it contains corrosion inhibitors, but it also contains glycol which both lowers the freezing point of the mixture, and raises the boiling point. )

So at 91C your car is doing just FINE - in fact it might appreciate a tad more heat. :D

That's what I thought. What and where is the problem we're trying to solve here? :rolleyes:

Download this clip

This is the Best Motoring Video about cars racing 20 laps in the heat (35 degree) Please notice how hot the RENESIS is compare with the Honda :(

http://www.step-hen.com/rx8/files/heatrace.WMV

So what!

Admit it Taka, you are just looking for an excuse to buy another piece of boy racer kit to flash up your car. :p

No offence meant Taka, but you're neither a mechanical engineer nor a chemical engineer and you appear to be grasping at straws here in order to justify another toy. :eek:

Don't you think that the people who make these things are going to find some conditions that allegedly "prove" that their product is better - regardless of how limted the test conditions were, and regardless of whether the alleged difference really is necessary or better anyway?

If people want to put spoilers, body kits, loud exhausts, racy bonnets, and fancy decorations on their cars then I say good luck to them - each to his own. Often they improve the fun that the driver gets out of the car in some way, and that's great. :)

Just don't expect me to take it too seriously. :p

Cheers, Chris

( and yes, I did put loud exahaust and other things on my car when I was a kid, and yes I AM a motor engineer, of over 35 years standing. Just a spoilsport old fart I guess. :D )

loud exhausts is fun instead, gets alot of attention on the road! :p but gets annoying after awhile, and too much vibrations from inside!

BVD,

No I am not going to buy any of these. I just thought it is funny that people actually want to prove that it works.

Gomez,

Yes I think it does nothing to the oil temp and water temp unless it is in the extreme condition really.

But still I am really concerned about the temp after I watch that clip. BTW you can buy the video (ENDURANCE RACE) in english in the local Autobarn.

Zephyr,
Yes I think Hymee exhaust is rice (gasp! ~ did I say that). I think it is pretty rice for an exhaust, any exhaust, that gain buggar all in terms of power. But it sounds sooooooooo good. Of course, mine sounds better than Hymees :) j/k

Timbo,
There is no heat problem to fix here. Otherwise, it will be a recall. But just someone really think a cool engine is a cool engine, mate.

But spending a $1000 on the bonnet I might have well change my radiator to a 3 layer bass one.

I will log my water temp with stock radiator next track day and scare the hell out of you. and me ;).

It will be in the middle of winter so I think I am safe. :D

Download this clip

This is the Best Motoring Video about cars racing 20 laps in the heat (35 degree) Please notice how hot the RENESIS is compare with the Honda :(

http://www.step-hen.com/rx8/files/heatrace.WMV

that video is stupid, why are they even comparing small N/A 4 cylinder engines with rotories and turboed rally cars??? so pointless

But spending a $1000 on the bonnet I might have well change my radiator to a 3 layer bass one.


taka, I'm trying to find the clinic you need to check yourself into. Man, you gotta kick this habit :eek: ...and we're all here to help you (although there are a few people with co-dependency problems :p )

If I thought the car had a cooling problem (which I don't) then the logical first place to start working on is a bigger, more efficient radiator and fan system. If the car has FI, then an intercooler is needed.

Incidentally, I was just with my rotary mechanic over lunch today, showing him the sCANalyser (which he loved!!) and while in his workshop I had it running, monitoring, among others, water temp, which was sitting at 95°C --- I asked if that was too hot, to which he replied, wryly, 'only if you touch the fr!kin manifold!'. He reckons Mazda have got rotary cooling pretty well sorted out at least for everyday use, and there's a good list of simple things to do for track work, none of which he reckoned would be necessary for an 8 owner unless (a) the car had FI or (b) you planned to do a serious number of continuous laps

none of which he reckoned would be necessary for an 8 owner unless (a) the car had FI or (b) you planned to do a serious number of continuous laps

He is spot on there Tim.
I am planning to do (b) :) first and (a) later on :D

Oil temp is also a key which you don't have in the sCANalyser.

Where is the coolant temp sensor, would the senor in the tubing more accurate of the coolant temp :confused:

that video is stupid, why are they even comparing small N/A 4 cylinder engines with rotories and turboed rally cars??? so pointless
Read beyond the race Zephyr, the race is aimed to get info on oil and water temp, under race condition, on all common track cars in Japan. At the end they also look at the tyre wear and discuss them too. RE070 in the STi is worn out after 40 laps at 35 degree heat. :)

I can't be bothered reading all this....can someone please tell me

do I

or do I not

go to bunning's for a new angle grinder blade in the morning!!!

How big does the hole have to be to stop a china syndrome under the bonnet????........

I can't be bothered reading all this....can someone please tell me

do I

or do I not

go to bunning's for a new angle grinder blade in the morning!!!

How big does the hole have to be to stop a china syndrome under the bonnet????........
Don't worry about the bonnet. Mike

It is all a laugh.

You rather spend $30 to do what Wildcard have done (ie take the VFAD out and put the $30 plastic tube in). Should we now say it is the *Wildcard RAM intake? ;)

*Wildcard is a registered trademark by Wildcard co. Ltd :cool:

[. . .] it is unwise to replace a critical body component (the hood) which has been specifically designed to minimize trauma to pedestrians in case of impact.

A trauma minimizing hood is no subsitute for not running people over.
:D

A trauma minimizing hood is no subsitute for not running people over.
:D
Nor is a seatbelt a substitute for not stopping suddenly. I'm afraid I don't get your point.

I think it was just a bit of humor. ie best way to avoid body trauma is to not hit people.

Anyway, isnt it ironic that there is now a recall on regarding heat problems :-D Yes I know its not engine related.

Andrew

The bonnet is well designed & does the job of cooling everything down. Albiet at the expense of ergonomics.

I think a great compromise would be a cold air induction kit for the intake manifold.

Perhaps the RX-7SP design would be better suited as there where "tasteful" venting at the front & tasteful ducting at the rear of the boonet. The result was a great visual appearance & excellent cooling.

You guys are typical for first time rotor heads (in general). Just wait another 10+ years when the used series-I RX-8's you all own are affordable to the younger generation & they are modifying anything & everything on them. Your hair will certainly turn white if it already hasn't..........lol

.

There's already a handful of these owned by lil young'n's.

Even myself, yet i have not done a single mod that i feel is appropriate.

Not that I have so much spare cash, its cause I'm always on this damn forum!

LOL

But there's been no reports (that I can find) of temperature-related failures... :confused:



please read thread(s) about oil temperature relasted engien failures with AT cars in the US.

Crikey zoom...gimme a break ... those reports postdate my comment :rolleyes:

please read thread(s) about oil temperature relasted engien failures with AT cars in the US.
Timbo is not quility but a 2nd oil cooler is a must now - I think gauges are essential too :)

A second oil cooler will do very little in heavy traffic idling for long time scenario :D what is needed is fans in front of the oil coolers that come on in conjunction with the radiator cooling fan when the sensors pick up that the car is getting overheated you dont need the fan on while the car is in motion :D

Heres a tread dealing with oil cooler fans .

http://www.rx8club.com/showthread.php?t=70948&highlight=oil+cooler+fans

B...free
michael

Crikey zoom...gimme a break ... those reports postdate my comment :rolleyes:


what where- damn old threads. sorry timbo

Lock,

I am sure you mean behind the oil cooler. It will be a very unattractive look with 2 windmill hanging in front of the front spoiler :p

I sort of agree, although I have the radiator fan on at my wish... I don't see much of a benefit in traffic unless I am very rough to the car. Well yet it is summer yet so I will tell you more about radiator fan controller.

The fans can be mounted in front of the oil coolers inside the front bumpers :D i believe theres enough room there :cool:

B...free
michael

So you are going to reinstall your radiator fan IN FRONT of your radiator too???? :D

Why would you like to install it in front (while it is blocking the air flow while cruising) and not in the back (where there is dead air and heaps of room)? I don't see the logic. You can cut the blacket at the back :p.

I doubt you need to brother. Give me an evidence that the oil temp goes over 130 degree Cel in standstill traffic!