Hey guys, I dont want to seem lazy but after the 18th page I gave up. 200 is alot to read. Can u all sum up what exactly happened?
Richard were u able to make it work, whats the boost, and the cost, etc?

Ash

 

still under development.

beers

 

2 years and its still under development??????
Are they available for the hondas or over all under development?

 

dont know.
might check a honda site..... tell us what you find.


beers

 

I think it was an idea to do it with the s2000. I think he is only developing it for the 8 right now.

 

ah ok.
Man that would be so tight...
SO what r u running under there, who me? oh a turbine lol

Hope it happens by mid 07 when i get mine!

thankz fellaz

 

when you get your what????

s2k rx8 sexchange????

beers

 

S2k development wont start until the RX-8 version is finalized and has started production runs (from the info I have gathered)

The RX-8 compressor is close if not exactly the same as the S2k version.

I am following both thread as my brother has an RX-8 and I am trying to talk him into getting one the AFSC for his once they get done and I drive an 04 S2k.

I will be getting an AFSC for my s2k as the AFSC is one of the most efficient compressors out there today. And I like to do thing a little bit different than everybody else out there. I am asking PR to make me a 12psi compressor for the S2k once the RX-8 and the S2k versions get into production.

If you want to see my crazy idea and plans check out
http://www.s2ki.com/forums/index.php...f=142&t=266584


Last page and look for the graphs and pictures of what I am planning for mine.

 

what kind of a question is that?

RX8!!!!

 

I'll step up and say to the S2K guys reading one of the longest threads on the RX8 forum, that there are allot of posts that could be deleted from the thread. Sorry - but when Richard does not post for a few days, we get into off topic discussions. It has become a hard thread to read that's for sure. Maybe a mod could clean it up a bit, and move the off topic posts into a "Let's have an offtopic discussion with RP thread"

 

I first stumbled on this thread (due to RP posting in the S2ki thread) when it was something like 150 pages long..

I read every post just to make sure I did not miss anything

I have been giving the S2ki guys updates on there own thread on the other board and attempting to answer there questions to keep this thread from getting loaded down with a bunch of question regarding the s2k version.

 

We could definitely do without alot of the posts here to make searching it more easy but going through a nearly 3000 post long thread post by post will take an extremely long time.

 

Not to mention if you took out all of the off toic material all you would have is a string of the same questions and answers for about 50 pages

 

What we really need is the ability to search within a thread. Then you could search for summary and go to the most recent post containing that word. They happen every 20 pages or so.

 

I'm sorry but Off Topic is the topic of this thread. When the thread starter gets into long discussions about early jet engines that he saw at an air show 30 years ago, I knew it was a bad sign. The problem is there is essentially no reason to subscribe to this thread or even open it (I open it about once every two weeks) because 19 out of 20 posts are worthless (including this one).

It is very frustrating considering the axial flow sounds very promissing, but this thread should be titled Happy Hour at the Ex-Officer's Club. I think on page 10, I suggested that this thread should be in the lounge; that hasn't changed.

When Richard started this thread I think he was new to internet forums and didn't divert side topics to other threads or start new threads about the side topics.

RP, I will delete this post myself in a day so you don't have to do it for me.

-Mr. Wigggles

 

Uhhhm, RP can't delete your post.....RG can though.

You might say this thread is for veteran RX8Club forum members. Those guys know the drill.

The new guys can either read this thread.....or wait for the "Finally on Sale!!" thread.....

 

Way “Out of the Box Idea”

How much input HP does it take to drive the compressor at its maximal PSI/flow for the RX-8? And at what input speed is this HP at?

All thought I know it would take way to much power (voltage/current) to drive the AFSC with a electrical motor.

I would be nice if it was possible to drive the compressor at its ideal speed at all times.
Instant boost no more linear boost profile!!!! System would still be throttled but as soon as you open the TB anywhere from idle to redline you would have some sick torque.

 

I did have the same idea and it should be somewhere in this thread. I believe since hybrids become more and more popular we eventually might see electric superchargers on sportscars.

Power = pressure times Volume per second divided by the efficiency gives you roughly the required power.

50000Pa x 0.0013m^3*8000rpm/60 / 0.7 (SI Units)
= 12.4 kW

At 8000 rpm it would need roughly 17HP in order to generate 7 psi of boost.
A lot but not impossible. But this is too big of a project for some aftermarket company. (This is only a partially practical solution: http://www.boosthead.com/home.php)

And some companies are already working on it:
Borg Warner was working on some electric supercharger (but can't find it anymore)
http://www.nexxtdrive.com/applicatio...er.php?lang=en

 

At how much flow? You need to know flow rate over time in relation to pressure as well. Compressing 1000 cu ft of air to 7 psi in the same amount of time as compressing 100 cu ft of air to the same pressure would require a different amount of power. If they were over the same amount of time, flow volume would have to be very different.

 

Not far off. I think between 18-21 to flow about 575CFM at 1.5 Pr.
You have to take in the belt drive, gears, bearings and seals. Plus there will be a loss from ducting. I only have the theoretical numbers plus what I can gleen from the test rig.

In the words of the Sundance Kid "You just keep thinking Butch, that's what you're good at."

 

Richard how many horsepower can theoretically make per cfm of airflow at ambient pressure?

 

I'm glad you said ambient, but that can be anything as long as that's what's outside. This is why lbs/min is better to talk in. We already spoke of HP per lbs prior to this. So you can get CFM by dividing by .066. The constant is a number I use just from experience.

Most turbo maps use .069 because they calculate to 28.4 in hg at 85f. STD correction is 60f and 29.92. This is not usually operating conditions. I can't remember exactly what a BAR is rated at but I think it is about 29.5 at 70f. This is more realistic to operating conditions.

I think the turbo constant is to conservitive and STD is to optimistic so that is where my number comes from.

So if we use my number and have 40lbs/min div by .066 you get 606 cfm. This on a good piston engine will relate to about 400HP. On the rotary the jury is still out, but is less. Probably 20%. We will know when this is all over. Meaning after the engine dyno tests.

Hymee made dyno runs with the Ren but I don't know if they took physical numbers of the intake air flow.


BTW, power to compress air is: lbs/sec X delta T X .0395
This is only the work done on the air, you must add all the other losses.

 

I read somewhere that BMW is working on a steam driven supercharger, with the steam a by-product of catalytic converter heat (insert detail). Food for thought

 

And it will come with a "cow catcher" for a front bumper

 

Let's look at this idea. First you have a water tank then pump it through a boiler/heatexchanger that makes it into steam. Then through a turbine that creates rotation and couples to the input on the supercharger. Some gearing may be required here.
then recapture the condensation and return it back to the tank.
Without going into the heatexchange itself I think we have enough hardware to make Rube Goldburg happy.

Steam is very dangerous stuff and I doubt you will ever get the feds to allow it.
If BMW is really working on this then you know why the charge so much for their cars.