Restrictor Pills on the 99 spec (N3G1) turbos?
09-23-13 | 12:36 PM
#1
Restrictor Pills on the 99 spec (N3G1) turbos?
I'm wondering if the n3G1 turbos come with restrictor pills already or if I need to reuse the ones I have from my old setup?
I did a search and found a few people asking the same question but no answers
I did a search and found a few people asking the same question but no answers
09-23-13 | 12:58 PM
#2
Should be apparent if they are in the rubber lines that came with your new turbo's, yes?
Did your 99 turbos come with all the lines? Most people cut them off or remove them, meaning you'd need to recycle your old boost pills.
If you're going to run a boost controller it wouldn't matter anyways.
Did your 99 turbos come with all the lines? Most people cut them off or remove them, meaning you'd need to recycle your old boost pills.
If you're going to run a boost controller it wouldn't matter anyways.
09-23-13 | 01:10 PM
#3
Should be apparent if they are in the rubber lines that came with your new turbo's, yes?
Did your 99 turbos come with all the lines? Most people cut them off or remove them, meaning you'd need to recycle your old boost pills.
If you're going to run a boost controller it wouldn't matter anyways.
Did your 99 turbos come with all the lines? Most people cut them off or remove them, meaning you'd need to recycle your old boost pills.
If you're going to run a boost controller it wouldn't matter anyways.
which requires them .
09-23-13 | 02:10 PM
#7
https://www.rx7club.com/3rd-generati...2/#post9831225
Worst case, the restrictors aren't required(as far as I know). They only delay the boost signal to the actuator, and that can be tuned out by any boost control system you can affect.
The restrictors are built into the later N3C1 turbos. I believe they were stock on '95s and on any newer sets of turbos.
The restrictors are built into the 2 nipples coming off the compressor housing.
If you're not sure if you have the later turbos, the early N3A1 turbos have green wastegate actuators and the little stamp label on the secondary turbo's compressor housing has N3A1. The N3C1 turbos have gold colored wastegate actuators and N3C1 on the secondary housing. If you see N3G1, that's the '99+ 280hp turbos
.
With the restrictors built into that nipple, you have to either drill them out or remove the nipple entirely. On turbos that will be used with an aftermarket boost controller I remove the stock 2-port nipple, drill and tap the hole it was in for 1/8" NPT, and screw in a brass fitting with 1 nipple. No need for that second nipple with an EBC, just something to cap and the cap can come off.
Dale
The restrictors are built into the 2 nipples coming off the compressor housing.
If you're not sure if you have the later turbos, the early N3A1 turbos have green wastegate actuators and the little stamp label on the secondary turbo's compressor housing has N3A1. The N3C1 turbos have gold colored wastegate actuators and N3C1 on the secondary housing. If you see N3G1, that's the '99+ 280hp turbos
.With the restrictors built into that nipple, you have to either drill them out or remove the nipple entirely. On turbos that will be used with an aftermarket boost controller I remove the stock 2-port nipple, drill and tap the hole it was in for 1/8" NPT, and screw in a brass fitting with 1 nipple. No need for that second nipple with an EBC, just something to cap and the cap can come off.
Dale
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09-23-13 | 02:29 PM
#8
Restrictors are only needed if you're using the factory boost control. If you're using an aftermarket boost controller, you do NOT want those pills/restrictors in there.
It's pretty obvious if you look at the nipples on the compressor housing if they have restrictors in there. If you don't have them and need them for some reason, you can buy used restrictor pills - hell, I've got a few laying around. Or, do the right thing and get a good boost controller.
Dale
It's pretty obvious if you look at the nipples on the compressor housing if they have restrictors in there. If you don't have them and need them for some reason, you can buy used restrictor pills - hell, I've got a few laying around. Or, do the right thing and get a good boost controller.
Dale
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msilvia (07-26-22)
09-24-13 | 01:00 PM
#9
I've always heard the factory (or at least the PFC) boost control is pretty good for twins.
I had some boost creeping issues on the track (12 psi was probably more like 14 down the long straights), but not really on the street for short 15 psi bursts. When I put in a new motor and new '99 turbos though, even exhaust restrictors wouldn't really control boost. Had to port the wastegate, but now it's rock solid... to the point that I'm not getting my "cheat" up to 14 psi at the track.
I don't think the pills really affect that though... they are more about spiking than creep AFAIK
I had some boost creeping issues on the track (12 psi was probably more like 14 down the long straights), but not really on the street for short 15 psi bursts. When I put in a new motor and new '99 turbos though, even exhaust restrictors wouldn't really control boost. Had to port the wastegate, but now it's rock solid... to the point that I'm not getting my "cheat" up to 14 psi at the track.
I don't think the pills really affect that though... they are more about spiking than creep AFAIK
09-25-13 | 03:27 PM
#10
Restrictors are only needed if you're using the factory boost control. If you're using an aftermarket boost controller, you do NOT want those pills/restrictors in there.
It's pretty obvious if you look at the nipples on the compressor housing if they have restrictors in there. If you don't have them and need them for some reason, you can buy used restrictor pills - hell, I've got a few laying around. Or, do the right thing and get a good boost controller.
Dale
It's pretty obvious if you look at the nipples on the compressor housing if they have restrictors in there. If you don't have them and need them for some reason, you can buy used restrictor pills - hell, I've got a few laying around. Or, do the right thing and get a good boost controller.
Dale
I like the stock boost control from the PFC . its a bit tricky but I like it . I thoguth about just going with twin MBC's if the pills are gone .
12-19-13 | 02:06 AM
#11
Rotary Enthusiast
Joined: Apr 2008
Posts: 1,092
Likes: 5
From: NZ
hey there, iv got 99spec turbos and i just put in a manual boost control in today to try and control what i think is fuel cut in 3rd gear @ about 6k rpm. (pulls hard to redline in 1st and 2nd)
Anyway i had no pills in my lines, they were indeed built into the nipple. I drilled it out.
The restriction is quite far down the nipple so you cant see them with the turbos in the car, but if you put something thin down the hole you will be able to feel that there is a smaller hole deep in the nipple.
Im yet to test if its worked yet
Anyway i had no pills in my lines, they were indeed built into the nipple. I drilled it out.
The restriction is quite far down the nipple so you cant see them with the turbos in the car, but if you put something thin down the hole you will be able to feel that there is a smaller hole deep in the nipple.
Im yet to test if its worked yet
12-19-13 | 08:17 PM
#12
Rotary Enthusiast
Joined: Apr 2008
Posts: 1,092
Likes: 5
From: NZ
Figured I may aswell update this and say that drilling out the nipple on my waste gate seems to have solved the issue I was having that I can only assume was fuel cut.
I drilled the nipple out to 4.2mm (from approx 1.5mm). I do have a needle valve on the line also so i can vary the restriction. Have only tested it fully open so far but it seems to have fixed the issue.
Will do a little fine tuning when i get time.
I drilled the nipple out to 4.2mm (from approx 1.5mm). I do have a needle valve on the line also so i can vary the restriction. Have only tested it fully open so far but it seems to have fixed the issue.
Will do a little fine tuning when i get time.
05-19-15 | 10:36 AM
#13
Restrictors are only needed if you're using the factory boost control. If you're using an aftermarket boost controller, you do NOT want those pills/restrictors in there.
It's pretty obvious if you look at the nipples on the compressor housing if they have restrictors in there. If you don't have them and need them for some reason, you can buy used restrictor pills - hell, I've got a few laying around. Or, do the right thing and get a good boost controller.
Dale
It's pretty obvious if you look at the nipples on the compressor housing if they have restrictors in there. If you don't have them and need them for some reason, you can buy used restrictor pills - hell, I've got a few laying around. Or, do the right thing and get a good boost controller.
Dale
going to install 99 turbos
05-19-15 | 11:38 AM
#14
Power FC Components, Boost Control Kit b Mazda
05-19-15 | 01:45 PM
#15
https://www.rx7club.com/3rd-generati...owerfc-783314/
05-19-15 | 04:45 PM
#16
...it can. But not out of the box. You need to make sure you have the Power FC Boost Control Kit as well:
Power FC Components, Boost Control Kit b Mazda
Power FC Components, Boost Control Kit b Mazda
The number on the left which is the boost will regulate when fuel cut hits , the duty cycle on the left controls when the waste gate starts to open , the lesser the duty cycle the earlier the waste gate starts to open and the less your boost .
The 99 Turbos normally come with the pills integrated into it
Also before you put on the 99 twins PLEASE PORT THE WASTE GATE !
P.S. the issue with my turbos was the engine . I swapped turbos twice had the same issue , swapped motor and now turbos work just fine . that engine only lasted 8k miles before it blew.
07-26-22 | 09:54 AM
#17
Senior Member
Joined: Sep 2006
Posts: 252
Likes: 9
From: DC Metro
Sorry to resurrect an old thread.
