3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.

Restrictor Pills on the 99 spec (N3G1) turbos?

Old 09-23-13, 11:36 AM
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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
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Old 09-23-13, 11:58 AM
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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.
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Old 09-23-13, 12:10 PM
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Originally Posted by Barban View Post
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.
I'm using hte PFC's boost control function which has worked well for me in the past .

which requires them .
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Old 09-23-13, 12:52 PM
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They are built into the nipples on the actuators IIRC
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Old 09-23-13, 01:01 PM
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Old 09-23-13, 01:08 PM
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Originally Posted by RENESISFD View Post
They are built into the nipples on the actuators IIRC
IC , thank you.
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Old 09-23-13, 01:10 PM
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https://www.rx7club.com/3rd-generati...2/#post9831225

Originally Posted by DaleClark View Post
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
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.
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Old 09-23-13, 01:29 PM
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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
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Old 09-24-13, 12:00 PM
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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
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Old 09-25-13, 02:27 PM
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Originally Posted by DaleClark View Post
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

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 .
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Old 12-19-13, 01:06 AM
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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
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Old 12-19-13, 07:17 PM
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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.
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Old 05-19-15, 09:36 AM
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Originally Posted by DaleClark View Post
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
Does "aftermarket boost controller" mean Power FC?
going to install 99 turbos
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Old 05-19-15, 10:38 AM
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Originally Posted by Wild Rabbit View Post
Does "aftermarket boost controller" mean Power FC?
going to install 99 turbos
...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

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Old 05-19-15, 12:45 PM
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Originally Posted by MattGold View Post
...it can. But not out of the box. You need to make sure you have the Power FC Boost Control Kit as well
Believe the PFC w/o the boost controller will control the factory boost solenoids. If you don't have those, you will need the PFC boost controller...

https://www.rx7club.com/3rd-generati...owerfc-783314/
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Old 05-19-15, 03:45 PM
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Originally Posted by MattGold View Post
...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

The Power FC can regulate Boost just fine without the need for a new boost controller , and without the need for even the data logit .

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.
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