Will the boost pills keep my boost at 10psi with x amount of mods? I drove me car today and didn't notice it jump above 10 anywhere. Also do all fd's have pretty weak lowend? like >3k range?

 

we have factory boost pills. and yes home-made or some needle valves, or aftermarket pills will change the boost characteristics. The 13B does have pretty bad low-end torque. Thats why you have a good 7500-8000rpm redline. Just use it.

Danny

 

Boost pills are orfices in the path to the waitegate controls of both turbos. (even though they call it a turbo precontrol it is the waistgate for the secondary) The orfices (pills) are there to smooth out spikes and sudden changes in pressure to the controllers which makes for a smoother transitions. You dont have to run them with after market controllers.

 

Ummm... Not exactly.

Turbo Precontrol is not what I consider a wastegate. A wastegate would divert exhaust around the turbo and out the exhaust pipe. The Turbo Precontrol Valve diverts exhaust though the second turbo to prespool it before it comes online. A 'wastegate for the secondary' would divert exhaust around the secondary turbo and out the exhaust pipe. The exhaust would be 'wasted' (not used to spin a turbo). There is only one wastegate on the stock turbos.

The pills are used to control the rate at which the Wastegate Control Actuator and Turbo Precontrol Actuator fill up with pressure, effectively changing when they open.

Swapping out boost pills can help keep your boost at 10psi only to a point, depending on what you mean by 'x amount of mods'.

 

umm x amount of mods are intercooler, full exhaust (midpipe not highflo) , intake. My boost is like 9 drops to 8 jumps to 12 and QUICKLY falls to 10. This is too much boost with the stock ecu correct? Should I buy a pfc quick? And If I do noone around my area can tune it. So I will have to have them tune it for my mods then send it. Would it be better for my car to do it that way or just leave stock ecu in?

 

Sounds like you are transition spiking a bit to 12. You have opened up the intake and exhaust, so you have put yourself at a higher risk of running lean.

A smaller restriction in the Turbo Precontrol line might help reduce the spike. A smaller restriction in the Wastegate line might help your primary get back to 10.

I'd be worried about the fuel cut if I were you.

 

After reviewing what I wrote I need to pull myself out of the ditch on this one. I was refering to the turbo control and wastegate control actuators. I want to appologize for the confusion. In order to add an after market electronic controller you have to tie into both actuators and Y them together. Better yet, look at page f-84 of the tech manual and see that the only way the secondary get exhaust across it is by the turbo control vavle which is controlled by the turbo control actuator. The precontrol does the same thing, its function is to start the turbine spining but not producing boost. It is there to bring the secondary online smoothly. The turbo control valve acts as the secondaries wastegate. I was just tring to simplify the system and explain the function of the pills. But I admit that I made a mistake in labeling it the precontrol. I was I was right on the money with the function of the pills. (they only smooth out spikes and transitions in airflow to the actuators, they do not control boost settings that is the job of the solenoids)

my appologies again
J miller
(USAF aircraft envirionmental / electronic speacialist)

 

So if I get boost controller I can set it at 10 and the spike should stay down? Because I am dont exactly have 1300 bucks for a PFC right now.

O yea, I forgot to say that I have all reliabilty mods done, except for radiator. Even silicon hose job. The whole cab smells like gas, and my friend say that when I get on it i get puffs of black smoke at high rpms. Car stays less than half way on the temp guage. I am gonna hook up a egt guage soon and see if I am leaning out or not.

 

That gas smell worries me - as in an engine fire is next.

Did you replace the fuel pulsation dampener when you did the hose job? You NEED to find the cause of that gas smell before you drive it any more.

The EGT gauge is a worthless mod, the only way you can tell your A/F is with a wideband Lambda sensor.

 

Its not like gas smell where I can smell it in the cab. It smells like exhaust. I can only smell it when I get out of the car and go into say a house. But other than that nothing. My dad has a 928 and I know what it smells like when you can actually smell gas in the cab. This just smells like exhaust. I get some popping also when I let off of the gas at around 3500 rpms. Also the car has 41k original miles if that help any.

 

sounds to me like you are have slite boost creep. you have full exhaust like I do and I had boost creep. You need to get your wastegate ported that is the only solution to the problem unless you want to take steps backwards and get a cat.

 

Do you have someone where you live that ported your wastegate, or did you send it off? How much you pay, I would much rather keep the mp, I like the sound and power. so...