tried searching. I tried typing in max boost levels, stock boost, safe boost etc, but nothin difinitive..anyways I bought a 94 rx7 and the previous owner put a boost pill in the line. So now it's limited to 8psi. But now I have a walbro fuel pump. If I were to put that in would it be safe to up the boost? and to what levels? I was thinking 10 psi? Also the turbos are brand new. The car also has a full turbo back 3" exhaust. any suggestions?

 

No more than 10 psi with the stock ecu. You are probably getting boost creep too unless you have a ported wastegate.

 

I've run mine at 16.5 once, although my Tuner nearly killed me for doing it

 

try to keep stock boost levels until you get a Power Fc or any upgraded ECU if you want to keep the motor running.

Max

 

FYI, stock boost is 10psi. Also, wouldnt putting a pill in the line increase the boost pressure? Thats why I have always thought the stock set up has one in the line.

 

15psi before the stockers start to lose efficency.

 

so would i be safe in taking the pill out and getting a profec b or another ebc and setting the boost at 10psi max?

 

stock boost is 10-8-10...the car shouldn't need a pill in there if it is stock...that doesn't make any sense. Don't run any more than 10-11 lbs on the sock ecu or intercooler.

 

stock is 10 psi but if there is a pill in it it should just be pushing 8 psi you cou8ld get a petit ecu and have 14psi

 

the pervious owner said he put it in because with the full exhaust you get boost spike and with the pill in place it will help the boost spike and it won't harm the engine than?

 

You'll get boost spike regardless of any pills, the stock wategate spring is set to open at 7 psi.... so you're only boosing 1 psi above, minimum levels...

With a wide open exhaust the wategate is physically too small, and nothing you do to the pills will change that... get the wastegate ported or use an aftermarket cat, and you should be able to boost up to 12 psi on the stock ecu, but it's like playing with fire... the reason you can boost to 12 psi, is cause there's a cusion buit in to the stock ecu, in case there's a problem, or malfunction, so you have some room, before it blows... and to account for inconsitancies in fuel etc.... by pusing it to 12 psi, you have much less of a margin for error, a fuel pump won't help you, since it's the ecu, that delivers the fuel, you'll be fine with the stock pump untill you start maxing out the stock twins... @ around 14 psi, on pump gas.

 

ok so it's safe to take the pill out?

 

Good Info DCrosby. Oh and to help clear things up a little:

There is a pill in STOCK FD's(2 in fact). One pill is there to keep the wastgate from getting too much preasure, this is how you get STOCK boost.

If there was no pill or if it was removed all the preasure from the turbo would reach the wastegate. this will result in the wastegate FULLY opening. And with the WG fully opened without a pill you will only get 7 psi in a stock FD(stock wg spring is 7psi as DC stated.)

Cgotto6 you are correct, howere you can put a different sized pil in the line to also alter boost levels (the larger the whole in the pill the lower the boost and vise versa).

It's great to see peole trying to help out, but please make sure you have your facts straight before you go giving someone advice that could potentialy harm there car.

GOTBANNED: If your turbos are in as good of shape you say they are and your car is not having any problems. then the reason your boost is so low is bc the pill was removed from your wastegate line. And unless the seller put a DIFFERENT pill in the line, then he is full of poop. And yes it is safe to take the pill out (if there is one in there) and use a Boost controler to raise your boost back up to stock level....10-8-10.

oh and if you go with the profec b, I would advise you to try to find the first version. spec II is a PITA to set.

Have a nice day

 

thanks for the info.

 

There are *two* lines with pills in them. One controls the wastegate and the other controls the secondary pre-spool. They are both important in controlling boost spikes.

GOTBANNED: before you go and start removing/replacing pills and modifying the boost levels, go read the stickies and the FAQs and *understand* the boost system. This is *not* an engine that you can just start playiing around with boost settings on - you will blow an engine doing that.

Good luck,

-bill

 

i realize this. just not too familiar with the 3rd gen boost settings. I have read the FAQ'S and stickies, just needed re-assurance and info. I will be keeping the boost where it is than. I think the pevious owner meant the boost is 10-8-10 prob. which is where it is supposed to me at.

 

I think this thread proves that it is very difficult to get good advice on the weekends

 

there was a great pic, i believe majick made, of where these 2 lines are located.

When I got my engine rebuilt Gotham restricted my boost to 7 psi with vacuum lines (no pill) because I had 2 mods and no upgraded ECU yet. Once I got my ECU upgrade, I put back in the stock lines (with pills) and now I'm at 11ish. Seemed wierd to me at first but made sense later. Smaller hole from pill creates greater pressure/boost, duh.

 

Good pics and info in this thread, even if you don't want to install a manual boost controller.

http://www.robrobinette.com/boost_controller.htm

 

Why would gotham restrict boost to 7? I thought the theory was that as long as boost is kept at 10-8-10 everything would be fine, even with 2 or more mods. Were they just being overly cautious or were you getting spikes and/or creep?

 

Damn straight. Three random quotes in this thread from three people, all of which show an almost total lack of understanding on what the pills do:

 

LOL I was thinking the exact same thing, but i didn't want to point any fingers.

here are some more pixs...

1---The two small lines both have a pill in them( the shorter one is the line for the wastegate, the other is for the prespool.

2---This is with the wastegate line removed

3---This is the removed wastegate line sliced open and the pill removed

 

Just to be clear does using a larger pill in the wastegate line help control boost creep or boost spike? or both?

 

A larger pill in the wastegate line will reduce boost. Should help a spike. Probably won't stop creep.

 

cautious, understandable since the engine was under warranty. who knows what kind of deralict i could have been.