jspec turbos 99+ or 98 under
Originally posted by Cihuuy
some members here said that the BNR is the way to go as it can handle more boost and produce more power than the '99 spec twins...
if it is an update, then what is it an update from?? they just basically change the turbo wheels and etc rite, and not the housing?? so y is it an update and not an upgrade?
some members here said that the BNR is the way to go as it can handle more boost and produce more power than the '99 spec twins...
if it is an update, then what is it an update from?? they just basically change the turbo wheels and etc rite, and not the housing?? so y is it an update and not an upgrade?
A friend of mine got the standard BNR rebuild and I wasn't impessed. The secondary turbo had more radial play than when we shipped it out. My experience anyway.
Frank
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Doesn't look like it. All '99 spec turbos have gold/copper colored actuators. Although, used ... I dunno if they get oxidized over time. Turn them 90 degrees and look at the compressor housing hole. If there's a black plastic seal in there, then it's an RS/RZ assembly.
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Originally posted by Coulthard Fan
SleepR1 - I'm having a little trouble with the control system of the 99+ twins as well. I first noticed it on the track (at VIR), the 2nd turbo just wouldn't come on line in the straights after a few laps. I'm going to have a few things checked before my next track day - but I think it going to be tough to diagnose because this has only happened on the track. What problems are you having?
SleepR1 - I'm having a little trouble with the control system of the 99+ twins as well. I first noticed it on the track (at VIR), the 2nd turbo just wouldn't come on line in the straights after a few laps. I'm going to have a few things checked before my next track day - but I think it going to be tough to diagnose because this has only happened on the track. What problems are you having?
From the research I've read from this site http://www.autosportracetech.com/RX-7/rx7stuff.htm we need to check the following: vacuum lines from the vacuum chamber, 1-way check valves leading from the vacuum chamber, rat's nest, turbo control solenoids (the pair that sit under the extension manifold, aka UIM), the vacuum line between the rat's nest and the turbo control actuator, the charge relief valve, and charge relief actuator.
FWIW, I hear a loud whistling/high-pitch whining sound coming from the extension manifold area from 3000 rpm to redline?
My boost settings with the Power FC are:
1. 0.80 kg/cm^2 (11.4 psi), 74% base duty cycle, primary and secondary turbos
2. 0.90 kg/cm^2 (12.1 psi), 84% base duty cycle, primary and secondary turbos.
Recently boost has been overshooting the target boost by about 5% to 6%. This could point to the failing turbo control solenoids?
For now, I've replaced the 1-way check valve from the vacuum chamber to no avail. Tomorrow, I'm swapping out all the check valves under the extension manifold (except for the PCV), replacing the turbo control solenoid pair, and checking the vacuum line hook ups between the turbo control actuator and rat's nest.
I'll let you know if I'm successful...
Last edited by SleepR1; May 28, 2003 at 03:54 PM.
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Originally posted by redrotorR1
SleepR1 and Coulthard Fan, the sequential problem might have to do with your ECU settings. I've noticed a problem with the secondary lagging after going WOT, lifting, and getting back on the throttle. I've heard this is a PFC issue (possibly a PFS purple box issue too?). For the PFC, my local tuner says there's a setting for transition that you can manipulate to correct the secondary lag problem. If not that, check your solenoids. (Yay! Back into the rat's nest!
)
SleepR1 and Coulthard Fan, the sequential problem might have to do with your ECU settings. I've noticed a problem with the secondary lagging after going WOT, lifting, and getting back on the throttle. I've heard this is a PFC issue (possibly a PFS purple box issue too?). For the PFC, my local tuner says there's a setting for transition that you can manipulate to correct the secondary lag problem. If not that, check your solenoids. (Yay! Back into the rat's nest!
)
http://www.autosportracetech.com/RX-7/rx7stuff.htm
Last edited by SleepR1; May 28, 2003 at 03:55 PM.
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Originally posted by r0t0r-rooter
Here's a pic of my turbos which kind of shows the plastic lining by the compressor blades
Here's a pic of my turbos which kind of shows the plastic lining by the compressor blades
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Originally posted by r0t0r-rooter
Here's a pic of my turbos which kind of shows the plastic lining by the compressor blades. I don't know how long they would hold up under constant use... it looks like it might grind away if there's any play whatsoever. Sleep_r1 would know if there are any durabillity issues as he tracks his car with these turbos.
Here's a pic of my turbos which kind of shows the plastic lining by the compressor blades. I don't know how long they would hold up under constant use... it looks like it might grind away if there's any play whatsoever. Sleep_r1 would know if there are any durabillity issues as he tracks his car with these turbos.
call me Smokie Smokerson
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I got my turbos from SR motorsports back in Oct or Nov. It was the same place & a few days after Sleep_r1 (Manny, i think) got his from there too. According to the #'s on the box, they checked out to be the same as his. I think there was some other # somewhere else, but it escapes me at the moment...
Considering that the plastic lining/seal IS there, and now that the turbos are on the car, I DO get 10 psi by 2100-2300, I believe these are legit
Considering that the plastic lining/seal IS there, and now that the turbos are on the car, I DO get 10 psi by 2100-2300, I believe these are legit
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That's correct. The serial number you have in the picture is the Hitachi numbers. If you flip to the other side, you should see N3CS-xxxx or something like that. (Kinda hard to do when they're already mounted. 
)
)
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The C is the designation for later models. So anything with N3C1 should be the 99+ turbos. When I first ordered my RS/RZ's, they accidentally sent me RB's and I think they still said N3C1. I don't think the RS/RZ turbos have any specific indexing. Then again, I've only bought one set. Get pictures to verify.
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RB's, RS's........how are they different from the RZ's ? Are the RB's and RS's identical to our U.S. spec twins ? I know the RZ's are the ones rated at 280hp and abraisable housings. What about the others ?
LS6 Convert
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RS model had the same turbos as the RZ model. Hence why I use the RS/RZ acronym. RB model turbos do not have the abraidable seals and I'm not sure about the turbine wheel or the compressor fin configuration. The horsepower rating is bogus. The differences in horsepower is based on preset boost and tuning.
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On the turbos that hae the N3C1-A-6216 part #.......there is also a 3Z11 number stamped on the front compressor housing. Any ideas ? I'm in the process of tracking the above part # down.
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From: IN
Originally posted by SleepR1
Yup...you have to generate 20 inches Mercury of vacuum by letting off of the gas, and then re-applying the accelerator to get the second turbo to come online after you've passed the 4500 rpm switchover point.
From the research I've read from this site http://www.autosportracetech.com/RX-7/rx7stuff.htm we need to check the following: vacuum lines from the vacuum chamber, 1-way check valves leading from the vacuum chamber, rat's nest, turbo control solenoids (the pair that sit under the extension manifold, aka UIM), the vacuum line between the rat's nest and the turbo control actuator, the charge relief valve, and charge relief actuator.
FWIW, I hear a loud whistling/high-pitch whining sound coming from the extension manifold area from 3000 rpm to redline?
My boost settings with the Power FC are:
1. 0.80 kg/cm^2 (11.4 psi), 74% base duty cycle, primary and secondary turbos
2. 0.90 kg/cm^2 (12.1 psi), 84% base duty cycle, primary and secondary turbos.
Recently boost has been overshooting the target boost by about 5% to 6%. This could point to the failing turbo control solenoids?
For now, I've replaced the 1-way check valve from the vacuum chamber to no avail. Tomorrow, I'm swapping out all the check valves under the extension manifold (except for the PCV), replacing the turbo control solenoid pair, and checking the vacuum line hook ups between the turbo control actuator and rat's nest.
I'll let you know if I'm successful...
Yup...you have to generate 20 inches Mercury of vacuum by letting off of the gas, and then re-applying the accelerator to get the second turbo to come online after you've passed the 4500 rpm switchover point.
From the research I've read from this site http://www.autosportracetech.com/RX-7/rx7stuff.htm we need to check the following: vacuum lines from the vacuum chamber, 1-way check valves leading from the vacuum chamber, rat's nest, turbo control solenoids (the pair that sit under the extension manifold, aka UIM), the vacuum line between the rat's nest and the turbo control actuator, the charge relief valve, and charge relief actuator.
FWIW, I hear a loud whistling/high-pitch whining sound coming from the extension manifold area from 3000 rpm to redline?
My boost settings with the Power FC are:
1. 0.80 kg/cm^2 (11.4 psi), 74% base duty cycle, primary and secondary turbos
2. 0.90 kg/cm^2 (12.1 psi), 84% base duty cycle, primary and secondary turbos.
Recently boost has been overshooting the target boost by about 5% to 6%. This could point to the failing turbo control solenoids?
For now, I've replaced the 1-way check valve from the vacuum chamber to no avail. Tomorrow, I'm swapping out all the check valves under the extension manifold (except for the PCV), replacing the turbo control solenoid pair, and checking the vacuum line hook ups between the turbo control actuator and rat's nest.
I'll let you know if I'm successful...
My new boost control settings are:
1. Primary, 0.80 kg/cm2, 56% duty cycle; Secondary, 0.75 kg/cm2, 66% duty cycle
2. Primary, 0.90 kg/cm2, 62% duty cycle; Secondary, 0.85 kg/cm2, 72% duty cycle.
Believe or not the duty cycle settings made a difference in how the secondary turbo comes on.
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Originally posted by redrotorR1
It's an upgrade. They changed a number of things on the '99 RS/RZ turbos. The seals, the turbine wheel size, the compressor wheel fins .... supposedly the interior compressor housing is different; although I've yet to see it firsthand (you're more than welcome to tear apart your own set of RS/RZ turbos ). The performance alone sets it apart from the previous generation turbos.
SleepR1 and Coulthard Fan, the sequential problem might have to do with your ECU settings. I've noticed a problem with the secondary lagging after going WOT, lifting, and getting back on the throttle. I've heard this is a PFC issue (possibly a PFS purple box issue too?). For the PFC, my local tuner says there's a setting for transition that you can manipulate to correct the secondary lag problem. If not that, check your solenoids. (Yay! Back into the rat's nest! )
It's an upgrade. They changed a number of things on the '99 RS/RZ turbos. The seals, the turbine wheel size, the compressor wheel fins .... supposedly the interior compressor housing is different; although I've yet to see it firsthand (you're more than welcome to tear apart your own set of RS/RZ turbos
). The performance alone sets it apart from the previous generation turbos.SleepR1 and Coulthard Fan, the sequential problem might have to do with your ECU settings. I've noticed a problem with the secondary lagging after going WOT, lifting, and getting back on the throttle. I've heard this is a PFC issue (possibly a PFS purple box issue too?). For the PFC, my local tuner says there's a setting for transition that you can manipulate to correct the secondary lag problem. If not that, check your solenoids. (Yay! Back into the rat's nest!
)
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From: IN
^^Actually not true. Tried stomping the gas @ WOT in top gear. Primaries work great, then @ switchover the boost drops to 0.50 kg/cm^2 and secondary turbo has trouble coming online (injector duty cycle drops to 50%). If I lift off of the gas to create 20 inches Hg vacuum, and then stomp on the gas, the secondary boost comes on line. Still searching for the elusive vacuum leak.
Last edited by SleepR1; Jun 22, 2003 at 12:45 PM.
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FWIW, my problem was a vacuum chamber completely filled with OIL! Replaced the chambers (both pressure and vacuum) with a new chambers, and the second turbo comes online properly now.
I also replaced the PCV valve with a new one to prevent the vacuum chamber from filling up again. A bad PCV will pressurize the oil pan (when under boost pressure), causing an oil mess @ the filler neck, and forcing more oil through the primary turbo, thus oiling the entire intake tract. With a bad PCV valve, the oil will work its way through the vacuum lines, and will ultimately fill up the new vacuum chamber again.
I also replaced the PCV valve with a new one to prevent the vacuum chamber from filling up again. A bad PCV will pressurize the oil pan (when under boost pressure), causing an oil mess @ the filler neck, and forcing more oil through the primary turbo, thus oiling the entire intake tract. With a bad PCV valve, the oil will work its way through the vacuum lines, and will ultimately fill up the new vacuum chamber again.
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Guys, take a look and tell me what you see. Which ones are RZ's and which ones are not.......... Click here
Pimpin Rotors...and Hoes
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Originally posted by badass7
Guys, take a look and tell me what you see. Which ones are RZ's and which ones are not.......... Click here
Guys, take a look and tell me what you see. Which ones are RZ's and which ones are not.......... Click here
Eats, Sleeps, Dreams Rotary
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I just wanted to add to the pictures of the 99spec turbos as I have had this thread bookmarked for awhile.
Got a good deal on them from SRmotorsports...which was cheaper than the mazdacomp price, though not as cheap as I have seen posted on the forum. I hope the pics help as they did me as SR initially sent me the incorrect turbos.
Got a good deal on them from SRmotorsports...which was cheaper than the mazdacomp price, though not as cheap as I have seen posted on the forum. I hope the pics help as they did me as SR initially sent me the incorrect turbos.
