Boost creep problem and a few turbo questions
 

Im currently working on getting my 90 TII running. I just need a clutch set and oil cooler line and I should be running. Here is my current setup:
2.5" Downpipe and straightpipe with stock Y-pipe and stock mufflers. That will boost creep high with straight pipe right? I have a HKS FCD, HKS PFC F-con, and Walboro Fuel Pump. Is that enough to run 11psi. What # should I set the FCD at on the adjust point? Sorry, still new to turbo cars and I did research but I just want to make sure I got the information right in my head. I guess I have to port the wastegate, I hope its not too hard. And I wanted to run until I port the wastegate on the other turbo I have. But if its not safe, I will start-it up to know the jdm engine starts, then turn it off and wait til I port the wastegate. I need money for new tools and Im broke. I need a good boost controller too. Looking for an Old skool HKS.

Not with a stock cat-back and intake it won't. You might get 1-2psi extra, but that's not boost creep. Boost creep is when it keeps going up as revs rise.

More than enough. And it's Walbro. ;)

Setting 2.

http://www.hksusa.com/products/?id=683&rsku=4279

This is just disturbing...
If you're broke, you shouldn't be modifying the car, period.
You're already looking to push the boost up with a boost controller???
Dude, get your finances straighten out first, and then spend anything extra on the car.

You really should open up the exhaust first before even looking at a boost controller.
This is like a really twisted way to upgrade - boost controller before exhaust, and you're worried about boost creep???


-Ted

*sniff* *sniff* *Sniff* I smell something... smell s like.... hot metal.. burned oil......

Anyway...

You have an HKS intak and a modded TID, a 2'5 inch DP and a cat replacement pipe back to the stock catback....... the stock catback is the only thing keeping your from boost creep, and.... even with it.. because you opened the front end up.. you may get some boost creep ( NZ missed the HKS intake part)

porting your wastegate is a good idea and will definately help keep this down..

HOWEVER... you don't need a boost controller.. all a boost controller can do is INCREASE boost... Once you put a performance catback on that thing you are going to have your hands full keeping the boost to a manageable level, even wiht a ported wastegate.

Somebody peed in ted's Poi again... Some idiot posted something really retarded in another post i read earlier and i suspect that set Ted off!!!!!!!!

Anyway.. It seems from your you have all the goodies you need to get that car running well except the cat-back, just make sure you get that F-Con set up properly and don't go past 12 PSI (honestly... even with a ported stock wastegate... the only way to be sure of this is by eyeballing the boost gauge and lifting your right foot.. a boost controller isn't going to help you out there)

I run about the same exhaust setup to keep my boost at 8psi, I have an aftermarket 3" intake and 2" dp with straight pipe to stock "Y" with aftermarket mufflers. You are not going to see past 8-9psi with that exhaust. Get a full 3" exhaust and a boost controller at the same time. Don't install one without the other.

You and some others don't quite understand clearly, I thought with no cats it would boost creep. I didn't want to drive it if it did. Thats what I wanted to know. And I need a boost controller, because I am planning to get the Mazdaspeed Catback and a 3" Downpipe. I am getting low on money, but it doesnt mean I dont have a job and it doesnt mean I aint paying my bills and I am planning the better exhaust in the future. The main question I was asking was if my exhaust with no cats gonna make crazy boost creep. And If it did, I was gonna port the wastegate now. But since it wont and psi will go up only 1-2psi, I should be safe and I wont port until I get the better exhaust. And I got that answer from the others. But thanks anyways. People say your words get to people ted, but your not so bad :] Oh yea, sorry about misspelling Walbro, i didnt even care for it, but i got it for free. Plan to swap in Nippondenso Fuel Pump from Rx7store later after some more upgrades. BTW, I know boost controllers only raise boost. Thanks for all the help. Thanks Yearsofdecay, for letting me know about the stock y-pipe and mufflers got to go. I thought with the cats gone it was enough. I will probably get my exhaust by the end of this year with a good boost controller. Now I am not worried about not getting to drive it.

Oops, yeah I did.

WTF? A 3" exhaust is only going to result in more boost. A boost controller can only give you more boost. Why would you worry about installing one without the other?

Okay, we need to clarify what "boost creep" is.
Cause, there's a difference between "elevated boost due to a freer flowing exhaust" and "boost creep...
http://fc3spro.com/TECH/FAQ/bcreep.html


Okay, this is where is gets confusing.
If you're going to start opening the exhaust system up, why do you need a boost controller?
As YearsOfDecay already metioned, a boost controller can only raise boost, and it cannot lower it.
I have a short description in the above link.


Okay, if this it the case, then my advice is to wait a little longer, save the money, and then buy whatever you need in the future.


Stock exhaust and punching out the cats - 2psi increase.
With the cat-back, it's going to go up even more.
I don't know what the "Mazdaspeed Catback" consists of, but you should be running in the neighborhood of 10psi minimum.
I can't comment if the turbo will "crazy boost creep", but it might not considering the rest of the exhaust system is still pretty small.

I would seriously looking into an FCD, reprogrammed ECU, and an upgrade fuel pump and fuel pump power rewire.


-Ted

Yeah, I know the boost controller only raises boost. Thats why I am going to port the wastegate when I get a bigger exhaust. Shouldn't porting the wastegate be enough? And thanks Ted for confirming the 2psi increase. Id like to know what is gonna be up with my car. Oh, and I am already prepared for the 3" Full Exhaust. I got HKS FCD, HKS PFC Fcon, Walbro Fuel Pump. I just didnt want to drive my car if having a straight pipe instead of a cat will boost creep. Thanks for letting me know it doesnt boost creep but will increase in 2psi only. Now, I know I can drive my car without any porting of the wastegate until I free up my exhaust some more. I like to hear it from the experienced guys.

Sorry for bumping an old thread, but I'm in the same situation now. Ted, when you said "
I would seriously looking into an FCD, reprogrammed ECU, and an upgrade fuel pump and fuel pump power rewire.", do you mean something like rtek1.8? Would something like that be enough or should people just straight up go with standalone?

RTEK will work fine.
Get rid of that overboost fuel-cut - it is evil.


-Ted

rteks are great for s4 t2's

I blew mine up w/ just a 2.5" dp and conefilter w/ no FCD
silly me........