99+ Spec Turbo's
11-22-02, 05:35 AM
#26
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SleepR1,
The later FDs used a restriction in the nipple instead of the pill. You should be able to reuse your old pills or at the worst get a similar sized carb jet for your hoses.
Some people are happy with the PFC as a boost controller and some aren't. Many people have problems getting consistent boost because the PFC doesn't control the wastegate from a specified boost setting. It controls it from a user-entered duty cycle. Obviously, this has disadvantages because you will get different levels of boost with different weather conditions. A dedicated boost controller should be more stable and consistent.
The later FDs used a restriction in the nipple instead of the pill. You should be able to reuse your old pills or at the worst get a similar sized carb jet for your hoses.
Some people are happy with the PFC as a boost controller and some aren't. Many people have problems getting consistent boost because the PFC doesn't control the wastegate from a specified boost setting. It controls it from a user-entered duty cycle. Obviously, this has disadvantages because you will get different levels of boost with different weather conditions. A dedicated boost controller should be more stable and consistent.
11-22-02, 08:56 AM
#27
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SleepR1 - you don't need to reuse pills. There is a built-in restrictor in each of the nipples on the turbos housing. If you pull off the hoses and poke a 1/16" drill bit into each one you will find that the bit just fits into one, and won't quite fit into the other. Adding pills shouldn't hurt anything but they won't help either - and might slow down the response a tiny bit.
I use the PFC to control boost on the '99 turbos, no issues.
---------------
rynberg - while I agree with your assertion that some are happy with the PFC boost control, and some aren't - I think your other info is slightly wrong. The PFC uses BOTH a specified boost setting, AND a base duty cycle. The PFC starts with the specified duty cycle, and then adjusts it real-time to try to attain the specified boost level. I've logged the WG and PC duty cycles with boost numbers and have watched this happen.
If the user sets the "base duty" too far away then the PFC won't get to the target boot numbers. There are also other circumstances, such as bad hoses, solenoids, boost leaks, etc. that will throw the PFC off.
I use the PFC to control boost on the '99 turbos, no issues.
---------------
rynberg - while I agree with your assertion that some are happy with the PFC boost control, and some aren't - I think your other info is slightly wrong. The PFC uses BOTH a specified boost setting, AND a base duty cycle. The PFC starts with the specified duty cycle, and then adjusts it real-time to try to attain the specified boost level. I've logged the WG and PC duty cycles with boost numbers and have watched this happen.
If the user sets the "base duty" too far away then the PFC won't get to the target boot numbers. There are also other circumstances, such as bad hoses, solenoids, boost leaks, etc. that will throw the PFC off.
11-22-02, 10:15 AM
#29
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Re: vosko
Originally posted by SleepR1
That's quite right, vosko! As hard as I drive my FD on the track, only NEW twins will take the punishment of hard use.
Hmmm...maybe I'll get another 102,000 miles from the Japan spec twins eh??
I have an Anfini Y-pipe on order with Mazdaspeed Motorsports Develpment, so I'm doing the sequential turbos RIGHT this time
FWIW, I didn't "feel" any pill inside the wasteagate hoses...perhaps the J-specs don't come with a pill?
How does one control the boost with the J-specs and the Apexi FC commander? Do I need a stand alone boost controller to use with the Apexi PFC?? (sorry off-topic question).
That's quite right, vosko! As hard as I drive my FD on the track, only NEW twins will take the punishment of hard use.
Hmmm...maybe I'll get another 102,000 miles from the Japan spec twins eh??
I have an Anfini Y-pipe on order with Mazdaspeed Motorsports Develpment, so I'm doing the sequential turbos RIGHT this time
FWIW, I didn't "feel" any pill inside the wasteagate hoses...perhaps the J-specs don't come with a pill?
How does one control the boost with the J-specs and the Apexi FC commander? Do I need a stand alone boost controller to use with the Apexi PFC?? (sorry off-topic question).
maybe that clarifies it :p
11-22-02, 11:17 AM
#30
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but I don't have the gobs of money required for a new set. Like I said I will pay the $500 for the slightly sued set from JT-Imports.com and then I will save up my money for osme new ones....dang!
11-22-02, 03:03 PM
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Originally posted by ech
rynberg - while I agree with your assertion that some are happy with the PFC boost control, and some aren't - I think your other info is slightly wrong. The PFC uses BOTH a specified boost setting, AND a base duty cycle. The PFC starts with the specified duty cycle, and then adjusts it real-time to try to attain the specified boost level. I've logged the WG and PC duty cycles with boost numbers and have watched this happen.
If the user sets the "base duty" too far away then the PFC won't get to the target boot numbers. There are also other circumstances, such as bad hoses, solenoids, boost leaks, etc. that will throw the PFC off.
rynberg - while I agree with your assertion that some are happy with the PFC boost control, and some aren't - I think your other info is slightly wrong. The PFC uses BOTH a specified boost setting, AND a base duty cycle. The PFC starts with the specified duty cycle, and then adjusts it real-time to try to attain the specified boost level. I've logged the WG and PC duty cycles with boost numbers and have watched this happen.
If the user sets the "base duty" too far away then the PFC won't get to the target boot numbers. There are also other circumstances, such as bad hoses, solenoids, boost leaks, etc. that will throw the PFC off.
Just trying to get a better understanding of how the PFC actually works.
11-22-02, 06:04 PM
#34
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10.5 psi
is all I plan to use, so hopefully I won't run into the overboosting issue...
Besides, how does the PFC commander hook up to a boost controller, unless you set the boost at a maximum of 10.5 psi, and the PFC, can never go beyond that preset boost levelt--is that right?
Besides, how does the PFC commander hook up to a boost controller, unless you set the boost at a maximum of 10.5 psi, and the PFC, can never go beyond that preset boost levelt--is that right?
11-22-02, 11:17 PM
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Re: 10.5 psi
Originally posted by SleepR1
is all I plan to use, so hopefully I won't run into the overboosting issue...
Besides, how does the PFC commander hook up to a boost controller, unless you set the boost at a maximum of 10.5 psi, and the PFC, can never go beyond that preset boost levelt--is that right?
is all I plan to use, so hopefully I won't run into the overboosting issue...
Besides, how does the PFC commander hook up to a boost controller, unless you set the boost at a maximum of 10.5 psi, and the PFC, can never go beyond that preset boost levelt--is that right?
12-03-02, 12:07 PM
#36
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So in my case, eventhough I plan to use only 10.5 psi on the J-specs and ported KDR motor...I'll need to buy a separte boost controller, set that to 10, and set the PFC to 12 psi, to avoid fuel cut...damn that's goofy! Oh well, so long as it works.
So which boost controller works best with sequential twins, eh???
So which boost controller works best with sequential twins, eh???
Last edited by SleepR1; 12-03-02 at 12:10 PM.
12-03-02, 06:55 PM
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I'm with Vosko
I don't think you need a separate boost controller either. I run the P-Fc with stock twins (I know not the 99's and not street ported) and it works fine. I don't think the increase flow of the port or turbos will exceed the P-FC. I'd say dyno it and see if the A/F is OK. The extra boost controller seems like a waste of money to me.
2c
2c
12-03-02, 07:07 PM
#40
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Ok, nuff said...I won't waste the money on a stand-alone boost controller... I'll let the A'pexi do the controlling...sounds like a consensus to me
Now about this new engine torque brace the Rx7 Store sells...who has one and do you like it??
Now about this new engine torque brace the Rx7 Store sells...who has one and do you like it??
01-12-03, 10:17 AM
#41
SleepR1- I doubt you will find anyone who doesnt like those braces. I cant speek for the price because I havent shopped them in the us.
Just to clear up some misunderstanding I saw earlier. The 99+ RS and the 99+ RZ turbos are one and the same, the 99+ "RB" turbos are the ones without the abraiseable compressor housings and the 265 power rating.
Not to self promote while threadjacking but... I have a set in like new shape for sale
...
Just to clear up some misunderstanding I saw earlier. The 99+ RS and the 99+ RZ turbos are one and the same, the 99+ "RB" turbos are the ones without the abraiseable compressor housings and the 265 power rating.
Not to self promote while threadjacking but... I have a set in like new shape for sale
...
Last edited by laujesse; 01-12-03 at 10:20 AM.
01-12-03, 02:15 PM
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Originally posted by SleepR1
So in my case, eventhough I plan to use only 10.5 psi on the J-specs and ported KDR motor...I'll need to buy a separte boost controller, set that to 10, and set the PFC to 12 psi, to avoid fuel cut...damn that's goofy! Oh well, so long as it works.
So which boost controller works best with sequential twins, eh???
So in my case, eventhough I plan to use only 10.5 psi on the J-specs and ported KDR motor...I'll need to buy a separte boost controller, set that to 10, and set the PFC to 12 psi, to avoid fuel cut...damn that's goofy! Oh well, so long as it works.
So which boost controller works best with sequential twins, eh???
You can probably search for my screen name and the term "Fuel cut" or "Boost Cut". You will find all my agony. I have finally after about 60 passes at the drag strip figured out how to stop the fuel cut.
When I was set for 12 PSI and I would spike to 15 and then I would get a fuel cut. The power FC will NOT register your spikes even if you hit fuel cut. Anyway, before I may have setting like this..
.80 .68
.80 .78
This caused a fuel cut. I found that if I would make a change like this....
.80 .58
.85 .54
I would avoid my fuel cut all together. If you set your duty cycle back you will eventually get it to where it will not spike. The problem is if the weather changes you can spike again. Its a PIA, but you can work with it. I also found that the higher your boost and the lower your duty cycle=less chance to spike.
10-28-03, 01:58 PM
#43
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Originally posted by ech
SleepR1 - you don't need to reuse pills. There is a built-in restrictor in each of the nipples on the turbos housing. If you pull off the hoses and poke a 1/16" drill bit into each one you will find that the bit just fits into one, and won't quite fit into the other. Adding pills shouldn't hurt anything but they won't help either - and might slow down the response a tiny bit.
SleepR1 - you don't need to reuse pills. There is a built-in restrictor in each of the nipples on the turbos housing. If you pull off the hoses and poke a 1/16" drill bit into each one you will find that the bit just fits into one, and won't quite fit into the other. Adding pills shouldn't hurt anything but they won't help either - and might slow down the response a tiny bit.
