Got a couple questions, but lemme introduce myself.
08-18-2007, 12:01 AM
#22
Senior Member
Join Date: Sep 2006
Location: San Diego
Posts: 274
If you really want the power start with a TII. It will be a hell of a lot cheaper in the long run and less of a headache. From personal experience I would strongly urge you to get an N/A. Turbo rotaries can be much more complex and are less reliable. I own a turbo rotary and wouldn't trade for the wold but it can get real expensive to fix even now it is hard for me to afford the thing.
If you want to use it as a weekend autocrosser (I say this as a racer since the happy age of 15) Get a car with less power. The car I learned the most from a car that was no more than 100rwhp. An old MR2. You will figure out how to make up for the lack of power and thus become a better driver/racer.
My .02
If you want to use it as a weekend autocrosser (I say this as a racer since the happy age of 15) Get a car with less power. The car I learned the most from a car that was no more than 100rwhp. An old MR2. You will figure out how to make up for the lack of power and thus become a better driver/racer.
My .02
08-18-2007, 05:17 AM
#24
Senior Member
Join Date: Jan 2004
Location: Columbia IL/St. Louis MO
Posts: 2,748
If your father has a problem with RX-7's/Rotary Powered Cars in general, pull up a video of Jesus Padilia in his 20b powered RX-7. That should answer any problems he has. 
Or any RX-7 with 400hp running 10's in street trim.
Honestly, your best bet is to get an S4 or S5 N/A, STOCK, and drive it for a while. Diagnose problems, figure out what makes it tick and go haywire, read EVERYTHING you can read on forums, and have fun. DO NOT buy a TII for your first car, as most are beaten to ****, or the other ones are pushing alot of power, and cost 5K+.
Or you could possibly go with an FB, but i nicely running non rusting FB/SA usually goes for more than an S4-5 N/A.
Honestly, your best bet is to get an S4 or S5 N/A, STOCK, and drive it for a while. Diagnose problems, figure out what makes it tick and go haywire, read EVERYTHING you can read on forums, and have fun. DO NOT buy a TII for your first car, as most are beaten to ****, or the other ones are pushing alot of power, and cost 5K+.
Or you could possibly go with an FB, but i nicely running non rusting FB/SA usually goes for more than an S4-5 N/A.
08-18-2007, 05:54 AM
#25
Junior Member
Thread Starter
Join Date: Aug 2007
Posts: 28
It's GONNA be a NA S4/S5.
I don't want a TII. I want to do a turbo NA motor if I DO go turbo. Just a re-port on it to bleed compression SLIGHTLY, and run an RPM switch on the aux ports.
I want to buy a exhaust flange and start piping it. Any idea how running both pipes separated all the way back would sound? (Might not make the best power, but the sound would be unique, even amongst rotaries!)
Huh. What think of that? I won't do it (the exhaust wackiness) until I'm used to the car's quirks, but it'd be another reason to turn heads.
I don't want a TII. I want to do a turbo NA motor if I DO go turbo. Just a re-port on it to bleed compression SLIGHTLY, and run an RPM switch on the aux ports.
I want to buy a exhaust flange and start piping it. Any idea how running both pipes separated all the way back would sound? (Might not make the best power, but the sound would be unique, even amongst rotaries!)
Huh. What think of that? I won't do it (the exhaust wackiness) until I'm used to the car's quirks, but it'd be another reason to turn heads.
08-18-2007, 05:26 PM
#26
Senior Member
Join Date: Nov 2002
Location: Cincinnati, Oh hi hoe!
Posts: 2,286
Originally Posted by KA Mallender' post='880627' date='Aug 18 2007, 06:54 AM
It's GONNA be a NA S4/S5.
I don't want a TII. I want to do a turbo NA motor if I DO go turbo. Just a re-port on it to bleed compression SLIGHTLY, and run an RPM switch on the aux ports.
I want to buy a exhaust flange and start piping it. Any idea how running both pipes separated all the way back would sound? (Might not make the best power, but the sound would be unique, even amongst rotaries!)
Huh. What think of that? I won't do it (the exhaust wackiness) until I'm used to the car's quirks, but it'd be another reason to turn heads.
I don't want a TII. I want to do a turbo NA motor if I DO go turbo. Just a re-port on it to bleed compression SLIGHTLY, and run an RPM switch on the aux ports.
I want to buy a exhaust flange and start piping it. Any idea how running both pipes separated all the way back would sound? (Might not make the best power, but the sound would be unique, even amongst rotaries!)
Huh. What think of that? I won't do it (the exhaust wackiness) until I'm used to the car's quirks, but it'd be another reason to turn heads.
you have the change out rotors to run lower compression.
08-18-2007, 08:31 PM
#28
Junior Member
Thread Starter
Join Date: Aug 2007
Posts: 28
Not if I port a little into the compression...
It's like tossing a cam meant for a 14:1 motor (in a reciprocal) into a 8:1 motor. Drops effective compression. And vice versa. The 14:1 motor NEEDS that cam. A mild job meant for an 8:1 will shoot the effective compression ratio up closer to the static 14:1. Detonation (and all the bad things known about high compression motors) ensues.
Methinks it would apply to rotaries as well.
It's like tossing a cam meant for a 14:1 motor (in a reciprocal) into a 8:1 motor. Drops effective compression. And vice versa. The 14:1 motor NEEDS that cam. A mild job meant for an 8:1 will shoot the effective compression ratio up closer to the static 14:1. Detonation (and all the bad things known about high compression motors) ensues.
Methinks it would apply to rotaries as well.
08-19-2007, 02:51 AM
#29
Senior Member
Join Date: Nov 2002
Location: Cincinnati, Oh hi hoe!
Posts: 2,286
Originally Posted by KA Mallender' post='880680' date='Aug 18 2007, 09:31 PM
Not if I port a little into the compression...
It's like tossing a cam meant for a 14:1 motor (in a reciprocal) into a 8:1 motor. Drops effective compression. And vice versa. The 14:1 motor NEEDS that cam. A mild job meant for an 8:1 will shoot the effective compression ratio up closer to the static 14:1. Detonation (and all the bad things known about high compression motors) ensues.
Methinks it would apply to rotaries as well.
It's like tossing a cam meant for a 14:1 motor (in a reciprocal) into a 8:1 motor. Drops effective compression. And vice versa. The 14:1 motor NEEDS that cam. A mild job meant for an 8:1 will shoot the effective compression ratio up closer to the static 14:1. Detonation (and all the bad things known about high compression motors) ensues.
Methinks it would apply to rotaries as well.
never heard of it before, would think if it was that easy itd be a commonly known trick..
08-19-2007, 05:40 AM
#30
Junior Member
Thread Starter
Join Date: Aug 2007
Posts: 28
Ehh, we Mallenders are like that. We build turbo motors with more compression and less boost. More compression will spool the turbo quicker, makes better overall use of the air/fuel, etc.
The opposite is the usual. Low (like 8:1 low) compression with big boost.
10 or 12:1 rotors anyone? Of course, it'd need a little work on pressure bleeding, but it'd run good! (Pressure bleeding with higher compression uses less air/fuel to get the same or better reaction. Only real thing limiting us on reciprocals is the camshafts have a basic grind already on them, so we can't get it ground to where we need it for truly creepy compression ratios.)
However, I don't see rotaries having that sort of problem. How far up could we safely port into the compression? I'm getting crazier by the second. I now have reason. I will have a rotary. If for no other purpose than to occupy a back porch. (That's where the Vega is sitting)
Goddamn, man! Now I'm all bent out of shape.
The opposite is the usual. Low (like 8:1 low) compression with big boost.
10 or 12:1 rotors anyone? Of course, it'd need a little work on pressure bleeding, but it'd run good! (Pressure bleeding with higher compression uses less air/fuel to get the same or better reaction. Only real thing limiting us on reciprocals is the camshafts have a basic grind already on them, so we can't get it ground to where we need it for truly creepy compression ratios.)
However, I don't see rotaries having that sort of problem. How far up could we safely port into the compression? I'm getting crazier by the second. I now have reason. I will have a rotary. If for no other purpose than to occupy a back porch. (That's where the Vega is sitting)
Goddamn, man! Now I'm all bent out of shape.