I found out the fd I jus bought does not have the restrictor pills in the lines to the actuators. I bought new lines with restrictor pills from Ray crowe. The question is does the end of the hose where the pill is closest go on the actuator or the primary turbo?

 

I don't think it matters as long as you use the correct line in the correct place (IIRC they are different lengths and the restrictor pills are slilghtly different sizes). Also, if you have any engine management system (such as apexi PFC) other than stock, be sure to turn the boost settings way down at first when you put the restrictor pills in. You can easily overboost and blow your engine if you don't do this! If everything is stock, you should be OK. You have many posts, so you may know the turbo system well. . .if not, read and learn before you proceed.

 

Thats what I figured but I wanted to make sure. I never had to work on a turbo system with a restrictor pill in the lines, so this is my first time. I have been working on FCs for quite a while and I'm catching on to the FDs sequential system. Its complex, but interesting to learn. Thanks for the heads up on the power fc thing, since im planning on getting one after i pass smog.

 

As stated above, it doesn't matter which end the pills are at. With the mods listed in your sig, you WILL OVERBOOST with the stock wastegate pill. I suggest that you put a needle valve (manual boost controller) in the wastegate line, and remove the pill. Open it all the way, and check your boost. Close the valve slowly until the boost is where you want it. The stock prespool pill will be fine.

 

Sounds like a good idea. Should I just get a hks evc vI instead? Or I heard the power fc had a boost control feature for the fd's sequential system. And just port the wastegate or port the restrictor pill hole?

 

The RB exhaust and the high flow cat will be restrictive enougn to prevent boost creep.

What is your car currently boosting to? The later model turbos had the restrictor pills built into the compressor housing outlet nipples. Make sure that the twins have not been replaced with a version that does not require the pills in the lines.

If the car does overboost the wastegate would need to be ported, which requires the turbos to be removed and disassembled.

 

With regard to the PFC, you should read

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/why-engine-so-damn-complicated-part-1-sequential-turbos-demystified-841821/page2/

an excellent thread by arghx with detailed information on how the PFC controls the boost with the twins, and some of its limitation. The PFC uses the same logic as the stock ECU, but with the added flexibility that you can change some of the system parameters.

- Sandro

 

Porting the watstegate has nothing to do with the cars boost level being too high. We are talking about overboosting, not boost creep. Any good boost controller will keep your boost in check. For the moment, you may be fine if you run the wastegate line with no pill in it. try it that way, to see how high the car boosts. If it is still too high, you probably have turbos with restrictors in the nipples.

 

Make sure the restriction pills are not build into the nipples on the turbos. Some had the pills in the vacuum lines other had restrictive nipples on the turbo where the vacuum lines connect.

 

how am I supposed to know if it's built in. The nipples look like normal nipples. My car is a 93 touring with 64k on it. Turbos are original, but when the engine went bad they put new vacuum hoses for the new engine but kept the same motor. Prev. Owner said ricks rotary did it. Well, I only get 7psi, and I found the pills are missing. I'm going to try it with the pills in and see how much I boost and go from there.

 

Making only 7 psi means that the turbos do not have the internal restictors. If they did you would be making 10psi. This is why my first question was "What is your car currently boosting to?". Doesn't sound like you having any overboost or creep issues. Put the restictors in and you should be fine.

 

That's what I figured, so that's why I bought the pills. I jus wanted to make sure it didn't matter which way it was facing like a one way check valve. I'm not gonna have it put back together yet because I'm waiting for my mishimoto radiator hoses to finish my koyo radiator install. I'll let u guys know how it goes. I hope it doesn't overboost like u say, and I plan on staying with 3" high flow cats.

 

Good advice!

Terrible advice!!! With the modifications you have done to your system, you could easily boost to 15 psi (or more) by putting the pills in.

 

I'll see how it goes with the pills first. I'll stop if it goes past 10 psi.

 

the potential for overboost depends on the level of restriction in the exhaust, as Banzai Racing pointed out.

 

You are absolutely wrong. If the car was going to boost to 15psi with the restrictors, it would be hitting at least 10 without them. You have been giving crap advice throughout this thread. Telling the OP he "WILL OVERBOOST" is crap. You obviously have no idea how the turbo control system works or even how a boost controller functions. Installing an EBC will not keep "the boost in check" if a car is overboosting, it can't control boost down, only up.


As I have previously said, the RB exhaust ant the high flow cat are restrictive enough to stop the turbos from overboosting.

 

I have a high flow cat & RB tailpipe. No issues of overboost or creep. You should be fine.

 

The OP wants his car to boost @10 psi. You have told him that he will be fine with the restrictor pills in. THAT is my definition of crap advice.

Since you seem to have no idea how doing airflow mods effect boost, with no boost control, I will explain it to you in small words. Here is the list of mods from the OP's sig:

Stock Twin Turbos, PFS SMIC w/ duct and Airbox, Racing Beat Exhaust, Bonez High Flow CaT.

I will assume he also has a downpipe.

Each time you remove a restriction of airflow from the system, boost is increased. Lets count the number of places that some of the restrictions have been lowered:

1. Downpipe
2. Airbox
3. Catback
4. Intercooler
5. High flow cat

That's 5 (five) airflow mods. With those mods, His car will likely boost to 15 psi or higher. Since he wants to run 10 psi, I don't think that's ok. In my opinion, running 15 psi (or higher) on a stock ecu isn't ok. Please tell me why you think it is ok


To Eternal Gamer: If you decide to check your boost with the pills in, do not try to do it at high rpm. Your stock ecu can't supply enough fuel for very long.

 

What are the internal restrictors?I'm only boosting about 5-7 psi, and I have the correct size pills in the lines

 

AdamC- You really don't have a clue do you? I do not care what airbox and IC are on the car, the exhaust is what is important. If it were an Apexi N1 with a straight midpipe, then yes the car would overboost, but even that could be eliminate with the slide in silencer. You are telling him that he is going to overboost and didn't even bother to find out what his baseline pressure is. That is pure arrogance, very similar to your other rubbish posts in many other threads.

We have had dozens of cars in the shop with these same basic mods, I am very familiar with how they react. For that matter we have had many, many FD's that have a full 3" with the RB catback, no cat, that don't have boost creep issues. AGAIN, the RB exhaust is restrictive

It doesn't matter what you say EternalGamer will prove you wrong shortly.

Shmaklepap-internal restrictors are built into the later model turbos, you have a different problem if you are only able to hit 5-7 psi with the inline pills.

 

You most certainly will be eating your words when he comes back telling us he is boosting 15 psi or more on a stock ecu. My car boosted 15 psi with a modified stock airbox, DP, and RB catback on a stock ecu. He has an intercooler, and high flow cat in addition to what I had.

Did I ever mention boost creep issues? Not a chance!!! Read it again little buddy

When he comes back with his results, I will expect a public apology .......... with no BS excuses!!!

 

To OP: use a mirror and a flashlight to look down the nipples, if they have the pills, you will be able to tell.

when i was installing my boost controller i was floored to see my lines had no pills in them either...my car was BONE stock when i got it and i know i didnt remove them. turns out that when the previous owner blew the motor Mazda put in a reman and the updated 99 twins!! it wasnt until i got it tuned and Dave @ KDR told me i had the 99s. then everything all made sense.

so, check the nipples, the pills are towards the back of them. maybe you have 99s and dont know it......it can happen

 

Ok finished putting the pills and cooling upgrades in. I took it out for a test run in 73 deg F. I hit a solid 10psi and it feels good, then transitions good but drops to 7psi from 4500rpm and up. Good news is I got no boost creep and that I got the primaries to kick in a solid 10psi but now I need to get the secondary boost running a solid 10psi. I'm thinking of replacing all the check valves just as preventative maintenance. I guess I got more reading to do, but I think I'm almost there. Any suggestions.

 

Make sure your turbo control actuator is functioning correctly. Here is a site with a lot of helpful info http://www.autosportracetech.com/RX-...leshooting.htm

 

I think you're the one who owe's someone an apology...hahahahaha.