areXseven

iTrader: (1)

How does one go about increasing boost ....and what are the principle, got to have engine mods, to run the FD above 10 psi (like 10 to 15 psi), safely without compromising the engine?... Besides upgrading the ECU. Thanks for your input.

tomaszjc7

Boost controller. Usually if you go to far, DP, intake, ect. and you run to much boost you need to get your wastegate ported. As far as running the FD above 10psi... I think its more than 10psi stock, I'm not sure though?

moehler

iTrader: (12)

With the stock ecu I wouldn't under any circumstances go above 12 psi. If you want to run 12psi safely, get the following:

1) Boost controller (profec B for instance)
2) Downpipe
3) intake
4) catback

If you upgrade the ecu, you can run higher boost settings, but not above 14 psi wothout upgradding the fuel system. Even at 14 psi on stock injectors, you would be pushing them to 100%. So if you want 14 or 15 psi, look at my sig... that's what you'll need. Good luck.

rynberg

You cannot run above 10 psi with the stock ecu.

easiest and safest way to get a reliable 12 psi:

*intake
*downpipe
*cat-back
*intercooler
*used M2 or Pettit ecu or PFC
*Profec B

You don't need the intercooler to make 12 psi but, IMO, you need one to do so reliably.

Technically, you don't need the Profec either with those ecus but I like the easy and better control of it.

areXseven

iTrader: (1)

moehler ; I'm currently running a 10-7-10 pattern with Blitz intake system, DP, mid pipe and huge HKS super drager muff. So what I need to run higher than 10 boost, is to install a Boost Controller and manually adjust it to make the engine produce above 10 psi (for sure!!)??.

moehler

iTrader: (12)

If your only running 10 psi with those mods, then something is wrong. Is you boost gauge accurate?
If so, then you definatley have some other problem. Also, you shouldn't be running with a mid-pipe on a stock ecu... I think the only reason you haven't blown her up yet is b/c you you have a boost problem that is restricting you to 10 psi.

areXseven

iTrader: (1)

moehler ; Boost leak maybe??? What are some of the problems I might be having that's keeping the boost at my level??

moehler

iTrader: (12)

I really don't know. It's not something I could diagnose. I had only a DP, high flow cat, and a CB and was hitting 12-13 psi (accidentlly) at one point on the stock ecu.

dubulup

I don't know what moehler is talking about, but I'd listen to the rotary fool who is telling you not to run more than 10psi with the stock ECU (11psi TOPS! but that's not safe)...

You need more fuel to maintain the propper A:F ratio...to be safe. Upgrading the ECU will get you more fuel. THE ONLY SAFE WAY I CAN THINK OF, if not the only way.

There is no way in hell you are going to run 15psi on the stock ECU...there is a fuel cut at a given psi, "don't you know"

It is not safe to just up the boost with the stock ECU.

any questions?

I do assume you want to keep driving your car.

areXseven

iTrader: (1)

dubulup: Understood!! but my initial inquery was what MODS, besides an upgraded ECU, do I have to install in order to safely run above 10 psi.
Looks like moehler may have a point about there possibly being something wrong with my engine cause I don't boost above 10 with the mods I currently have on my FD. Thanks for your input.

dubulup

Oh, I'm sorry I misunderstood what you were trying todo...

I made 301wrhp @ 12-13psi (seq) with the following mods:
Cold air intake
pullies
DP
Cat-back
ECU ()

since then I've added some things, I'm just waiting to go tune...

And yes, with a straight exhaust on you car, you boost should be up...i.e. 10-7-10, 11, 12, 13, 14... monster creep if you have no controller.

when are you getting 10psi?

areXseven

iTrader: (1)

dubulup: I achieve 10 psi only when i'm WOT. Actually it's more like 10-7-8 at WOT. What do you think?? Thanks.

dubulup

I meant what rpm?

seq...does seem to tapper off a bit towards redline.

Non-seq holds strong thru redline.

areXseven

iTrader: (1)

Primary turbo will boost to 10 Immediately upon WOT, then at 4500 rpm second turbo kicks in at 7psi and goes up to 8psi and holds steady there at WOT. Engine is very strong and rpm's very, very fast to redline without any type of hesitation. Very strong pull up to 8Kplus. FYI,..my FD is an Auto .

Snook

iTrader: (12)

ok maybe you have a boost leak or it's because you have an auto that you aren't building as much boost. You do have a problem though since the secondary turbo isn't getting 10psi.

But any way like everyone said with a full exhaust and intake like that you should be making 15-16psi naturally.
You are lucky that there is a problem somewhere. I'm not sure if the pettit ecu works with automatics and I don't think the pfc does very easily. If I were you I would leave the boost pattern the way it is right now and don't try to fix the leak and get an ecu. I love my pettit unlimited boost ecu and I hope it works for autos so you can get one. Then, I would get a boost controller and install it and try to diagnose your boost problem. After you get it to 10-8-10 then get an intercooler and a fuel pump and you can safely turn the boost to 12-13psi on 93 octane assuming that your fuel system is in good shape.

This is the only way to do it right and I'm possitive that if you try to get away with anything cheaper you will end up blowing the motor eventually. Listen to us 10psi is the max on the stock ecu. You are already pushing it with all those mods on it...it can't compensate for those mods and more boost. Remember just the mods themselves give you much more power with the same boost level. For example I just ran a 12.8 at the track with 11psi. Do you think that if I was stock and turned the boost up 1psi I could do this? NO!

good luck
-Snook

areXseven

iTrader: (1)

Snook: Good advise. Thanks. I think I'll look into buying a good aftermarket ECU as I'm sure I'll be needing one anyway. Then I'll buy a boost controller and sort out my secondary boost problem.

moehler

iTrader: (12)

Not to regress, but many people run 10-12 psi on their stock ecu (including me at one point for about three months as a daily driver). Everyone out there with only an intake, DP, and CB is probably running close to 12 psi if not more on a cold day. A long time ago I was considering getting pettit's TKT performance package and they even told me that it will probably have me running 11 or 12 psi on the stock ecu, but that it will be O.K. That's my justification for why I said 12 psi on the stock ecu. I didn't mean to give bad advice, but from my experiance I figured it would be O.K.

Snook

iTrader: (12)

well 12psi is ok at some rpms but at others it gives fuel cut

if you were able to get different boost levels at different rpms with some kind of controller then it would be fine.

rynberg has those numbers

but if pettit told you that it was ok then seriously it must be because cam over there is a rotary god. I'm loving all the pettit stuff on my car they are good people.

areXseven

iTrader: (1)

......safe to say that the "boost problem" is concentrated to the second turbo, correct???

rynberg

No. With those mods, you should be easily hitting 13+ on the primary and possibly spiking at transition. You have a boost leak that is saving your engine.

areXseven

iTrader: (1)

I think you guys are right. A boost leak is a safe bet........but, would crossed vacuum line(s) also cause this problem?

dubulup

with the seq twins...it could be anything...even you windshield wiper nozzles...

I'd like to take a poll to see how many FD have properly working twins...I know Artguy would be representing!

DaedelGT

Crossed vacuum lines would more likely cause 0 boost.

My twins are working well... for another estimated 15-20k miles

areXseven

iTrader: (1)

Well I've got Intake and IC hard pipes. I know the couplings aren't leaking. I haven't checked the stock y-pipe /connector. Maybe the stock y-pipe is the problem??? I'll check it this p.m. (I just ordered an Efini y-pipe.) What else?????

DaedelGT

Make sure the UIM is screwed down all the way.

I had some boost leakage when I had lost two of the UIM bolts.