areXseven

iTrader: (1)

I let her go at 80mph WOT and the boost jumped to 18psi. I let off the throttle and brought the boost down to 10psi. I was only half way depressed on the gas pedal.

I could hear the exhaust being propelled through the Magnaflow as it gave that awesome sounding roar while the car was gaining speeeeeed. The Tach read about 5500 rpm and I was going about 130mph when it happended, FUEL CUT-OFF.

Very, Very scary thing. I thought I had blown the engine. But it didn't. Everything seems to be allright. WHY does/did the ECU do that if I'm able to maintain the boost at 10psi. A/F mixture to lean I suppose...??? Profec B II is on the way!!

saxyman990

holy-****! That many mods and you're still on the stock ECU?? Or am I just not seeing it in your sig?

Dude, I'd get that fixed ASAP. If you were boosting 18 psi on the stock ECU, it's an absolute miracle you haven't popped the motor already...

As for the fuel cut-off... seems kinda odd that it happened at 5500RPM at 10 psi. If it was holding at 10psi, then fuel shouldn't have cut off... hmmm.... I don't think I've heard of that happening before.

Railgun

Doesn't fuel cut happen at about 11-12 psi on the stock
ECU?

rynberg

You were above 10 psi.....the stock ecu only cuts fuel if you are overboosting for more than a second. I believe overboost at that rpm is about 11 psi.

Also, the Profec is only going to be able to help you to a point. At some point, your wastegate is going to be overwhelmed and you won't be able to lower your boost below that point.

You really need a Pettit Unlimited ecu, at a minimum, and preferably a PFC. To be safe, you are also going to want to upgrade your fuel system if you can't keep your boost below 13 psi or so. And get a better intercooler....

saxyman990

yeah, 11-12 psi. That sounds about right, now that I think about it. It's extremely hard to hold the throttle half-way to maintain a desired boost level (especially when you are doing 100+ mph). Most likely, it crept up slightly and thats when fuel-cut kicked in.

areXseven

iTrader: (1)

I held the throttle pretty steady, but maybe boost creep got the best of me. I'm hoping Pettit can tweek my ECU and maintain my Hold feature in the tranny at the same time. I think I'm only getting excessive boost after secondary turbo transition.

RX-7racer88

Yeah your going to need to replace the ECU to avoid the fuel cut off problem. I would say go with the PFC if you can some time.

Mahjik

iTrader: (1)

Destroy

ECU will help but you need ot port your wastegate. Virtually the same thing happened to me, but I wasn't as lucky. Stock wastegate cannot keep up with the extra flow of a MP.

Oh yah, I had a fully tuned PFC at the time.

areXseven

iTrader: (1)

So I need to :
1). Upgrade ECU
2). Install Boost Cont.
3). Port Wastegate
4). Install larger IC (FMIC??)
5). Upgrade Primary/Secondary Injectors
6). What else????????

Mahjik

iTrader: (1)

That really depends on the goals for your car.

The easiest and cheapest way to go right now would be:

1. Boost controller
2. Hi-flo cat

That would bring your boost under control.

areXseven

iTrader: (1)

Everything changed when I installed the Magnaflow. Should I buy one that has 2.5" outlets?? Or buy a Cat-Conv. and have it installed in the middle of the MP.?? And of course, the B/C.

Mahjik

iTrader: (1)

IMO, I would go with the cat. I'm not a fan of midpipes so I'm not going to suggest you keep the one you have installed on there.

Like I said, it really depends on the type of goals you want for your car.

I would get the hi-flo cat installed and the boost controller. Those two will keep you in the safe zone until you can figure out what exactly you want out of your car.

rynberg

Mahjik: an island of sanity in a sea of power-crazed rotor heads....

areXseven

iTrader: (1)

Only Goals: To make it into a "dependable" 350-375 rwhp FD.

Mahjik

iTrader: (1)

Well, purchasing an automatic is not a good start to get to that goal. I'm not sure if the auto tranny will hold that kind of power, but there are many other members here with more experience in that area.

In short, he's about what you'll need in mods for that kind of power (keep in mind, this is a "reliable" list" and assuming the auto tranny can hold it):

1. Programmable ECU
2. 1200cc Secondaries (they seem to have less problems than the 1300cc)
3. Upgrade fuel pump
4. FMIC or Large SMIC
5. Medium sized Streetport

The rest of the things you'll need depend on if you are looking at just a dyno number or if you are looking to run that kind of power on the street daily. What I mean is that many people dyno their cars at 15 or more PSI, however they don't run any more than 12 or 13 PSI on the street for normal driving (some run even less). The reason is it's less wear on their components. If you are planning on running that kind of power daily, I would recommend aftermarket turbos. You can get that kind of power out of stock turbos, but you'll probably tear them up fairly quickly running them that hard all the time. The easiest way to get larger HP numbers is to switch to a single turbo.

IMO, you should think more about what kind of behavior you want for your car more than reaching a magical HP number. For instance, single turbos will have a different driving experience than the stock twin turbos, upgraded twin turbos will feel different as well as having non-seq turbos.

My recommendation is to get the hi-flo cat and boost controller. Enjoy the car and think about either selling it for a 5-speed or doing the conversion yourself. After that, you'll be in a better position to shoot for those higher HP numbers if that's still your goal.

areXseven

iTrader: (1)

I just want to squeeze as much HP out of the stock twins as possible, without compromising the engine too much. I like the Stock appearance of my FD and I'm going to keep it that way. I'll just up-grade the ECU and install a boost controller and all the orther mods that will keep the engine healthy. If I don't acheive the 350-375 rwhp, I'll be ok with it. The Car is plenty fast already.

It's the only FD in the Corpus area, so it gets alot of attention as it is. I'm having bookoos of fun with it on a daily basis.