Axial Flow Supercharger
Int'l Man of Mystery
Joined: Jan 2004
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From: Central Florida
Originally Posted by Richard Paul
You don't have to read the whole thread. Most of what you want is in the first five pages. That is when the entire forum was asking the same thing.
By the Trugell I like that title, I think I'll keep it.
I mean if Richard Petty can do it...........so there are two King Richards. Maybe that's why I'm the third?
Not that I can compare to his record of achivements. He truely is a King, but what the hell.
By the Trugell I like that title, I think I'll keep it.
I mean if Richard Petty can do it...........so there are two King Richards. Maybe that's why I'm the third?
Not that I can compare to his record of achivements. He truely is a King, but what the hell.
Didn't know you kept up with NASCAR.
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From: Hudson, MA
Ok, I read like the first 30 pages of this thread before I realized just how long it's gotten. Can we get a capsule summary for the late joiners like myself ? What's the state of this projects ? Has it been put in a car yet ? Are they available to buy ?
Thanks!
Thanks!
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Joined: Mar 2005
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I know that RG, I know he posted the price in the first post, but that was so long ago.. now that we are getting somewhere it's nice to know the price is still sitting where it started.. it looks like it's still @ 8psi, which if we use the greddy turbo as an example @ 7 psi with the right controller means 65-100 hp gain with boost choking @ 7500 rpm, a SC won't have this problem so it'd venture to say it'd get closer to 120 or more @ top end and have no lag.
maybe i'm wrong...
maybe i'm wrong...
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Joined: Apr 2003
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From: Houston
At a guess I'd say around the 300hp mark at the wheels. Richard will fill us in after he gets it totally done and tested. I know he's hesitant to give a number right now as he doesn't want to say one that is overly optiistic and then not hit it.
.
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From: Motorcity
Originally Posted by rotarygod
At a guess I'd say around the 300hp mark at the wheels. Richard will fill us in after he gets it totally done and tested. I know he's hesitant to give a number right now as he doesn't want to say one that is overly optiistic and then not hit it.
300 at the wheels would make the RX8 the car of my dreams. I might be able to hang with my coworkers GTO with that kind of power
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Joined: Apr 2005
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Originally Posted by deppenma
RP what is the Boost Vs engine RPM profile/equation with the current compressor?
I know the relationship is linear just what is the profile
1psi : 1kRPM;
1.5psi : 1kRPM;
2psi : 1kRPM
Ect ???
And also how would the ratio change if you were to add stages to the compressor to put out 10,11,or 12psi max
Knowing the maximum boost is based on max engine rpm and compressor design (compressor stages) I would like to calculate the boost amount at any RPM assuming WOT
I know the relationship is linear just what is the profile
1psi : 1kRPM;
1.5psi : 1kRPM;
2psi : 1kRPM
Ect ???
And also how would the ratio change if you were to add stages to the compressor to put out 10,11,or 12psi max
Knowing the maximum boost is based on max engine rpm and compressor design (compressor stages) I would like to calculate the boost amount at any RPM assuming WOT
Originally Posted by deppenma
RP is the above asumption valid??/
In a perfect world where the eff for both the engine and the SC were the same throughout their RPM range then yes. But we know this is not true don't we?
The pumping of both will effect the other, however for arguments sake we call it linear. Thus if there is going to be 8psi at 9000 then it is about 1 psi per 1k.
I have found a graph from some tests done on the dyno by Peterson Publishing years ago with four different blowers on the same engine. I'm going to try and get it scaned or photoed for you. It shows a lot about HP vs boost at the flywheel.
mine's better
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From: Aiken, SC
richard, you are my hero...
i think you need to start your own "The Apprentice"... show donald trump what's up.
anyway, good to hear everythings going well, cant wait for this thing. well i can, but, yeah...
i think you need to start your own "The Apprentice"... show donald trump what's up.
anyway, good to hear everythings going well, cant wait for this thing. well i can, but, yeah...
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Joined: Jul 2002
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From: portland oregon
Originally Posted by Richard Paul
I have found a graph from some tests done on the dyno by Peterson Publishing years ago with four different blowers on the same engine. I'm going to try and get it scaned or photoed for you. It shows a lot about HP vs boost at the flywheel.
You're right Mark- i doubt its an RX-8
Originally Posted by zoom44
You're right Mark- i doubt its an RX-8
Originally Posted by Richard Paul
It is a test of my axial flow SC against the other roots blowers all limited to 7psi manifold pressure on the same engine. All done by Airflow Research on a Superflow dyno.
This is a test that I spoke of a long time ago but couldn't find. It is a test of a 350 Chevy that had a base of aprox 320 BHP. The test was for all blower manufacturers to install their units set up for a max of 7 psi. If it didn't we had to change pulleys until we did.
The reason it is important here is that my unit made twice the increase then the next competitor. Aprox 140 vs 70. Also while the axial flow didn't make the pressure at the bottom end it still passed the roots at 3000 RPM. It started to pass the others while making less pressure due to the efficiency.
In the end the difference is that there was more mass for the given pressure and took less power to drive it. The new blower has more then 20 years of development from the unit tested here. It will perform much better in terms of efficiency and boost curve. Therefore I am anticipating that we will still match and then pass the positive displacment units at 3000 (even though it has a 9000 redline)and outperform them at the top for any given boost.
I also can claim this sort of delta compared today with any roots blower out there.
The reason it is important here is that my unit made twice the increase then the next competitor. Aprox 140 vs 70. Also while the axial flow didn't make the pressure at the bottom end it still passed the roots at 3000 RPM. It started to pass the others while making less pressure due to the efficiency.
In the end the difference is that there was more mass for the given pressure and took less power to drive it. The new blower has more then 20 years of development from the unit tested here. It will perform much better in terms of efficiency and boost curve. Therefore I am anticipating that we will still match and then pass the positive displacment units at 3000 (even though it has a 9000 redline)and outperform them at the top for any given boost.
I also can claim this sort of delta compared today with any roots blower out there.
Originally Posted by Hymee
I have a copy of the same graph, and the report that goes with it, courtesy of RAP.
Pretty sure it is a 350 Chev.
Pretty sure it is a 350 Chev.
You have that article? I don't have it, send me a copy, please.