first things first, I have searched and read, and searched and read...........

OK, I'll try to make the rundown as short and sweet as possible. My bro has been hounding me to build up his 93 FD Touring for months now because he/we have failed in the past. His car only has 30k original miles on it and it is ******* gorgeous. I have pretty decent knowledge of how the whole system works, however I do not know the limitations of the car and what parts work well with it.

His mods are as follows: upgraded vac hoses(the car never boosted right), efini twin turbos, greddy standard mount IC w/piping, Efini Y-pipe, good downpipe, fluidyne radiator, good AST, Greddy elbow, blitz BOV.

Plan so far: Upgrade fuel pump, injectors, get a PFC with commander, full catback exhaust, convert the twins to a non-sequential setup (port the wastegate), get a profec B boost controller or possibly the AVC-R, and upgrade the clutch and flywheel, hit the dyno. We pretty much ruled out going to single turbo cuz he already wasted his money on the efini twins (bad move IMO).

Goal: Looking to make about 400WHP at 17psi on the stock motor and maybe do a second mild setting for about 300WHP on 12psi

Is this all within reason for a stock motor (can he boost higher safely)??? Please let me know if you guys have any good/better suggestions as to what to do with the build. He has a decent amount of $$ to work with but he has most of the main **** besides fuel delivery outta the way. I have to whip him up a game plan before he goes to a shop and dumps 8K more than what's already in it just for a 400 WHP car that's semi-reliable (or as reliable as a 400 WHP car can be ).
He won't be auto-xing the car often cuz he's a bitch and can't handle my honduh in SM However, he still wants a fast car that's fast about 50X sweeter than mine. That shouldn't be tough to accomplish from here. Thanks in advance for any responses. I know there's some of you out here that have to be amazing at working with these motors.

As of right now, the car is not boosting correctly with the sequential setup. Intermittent boost failure basically and it's spiking like a **** and he's getting fuel cut. I believe it has something to do with the prespool as to the boost failure and the spike due to too many mods for a stock ECU to handle. So it looks like non-sequential is coming soon. Oh yeah, he also had a profec B spec 2 but I told him to sell it because it's a programming nightmare.

 

Well, first off I wouldn't expect to hit 400rwhp using the stock or Efini twins on stock engine ports. You should be able to get around 370rwhp realistically with a good tune.

As far as non-seq; if you really plan on Auto-X'ing the car, IMO you'll want to fix that sequential system instead.

While there are some minor nuances with the Profec 2, it's still one of the better EBC's available for the sequential setup.

 

Do a search on BNR stage 3 twin turbo.

It will lead you to your answers.

 

Sounds like he's got a pretty sweet car!

First off, 17psi on the later twins is a bad idea. To be sure, are these the '99+ twins from Japan with the abradable seals on the compressors? They are a tradeoff - you get a LOT better spoolup and response, but you lose total boost you can run with them. 12-13psi is a good, safe everyday setting, and 14psi would be about as far as I'd push them. More than that and you'll eat the turbos up pretty quickly.

I would do some work on the car and figure out *why* the car is having boost issues. The stock turbo system isn't that tricky to troubleshoot, especially if it's a relatively low mileage car that doesn't have a lot of the solenoids and actuators heat-baked and dead.

Profec B 2 a programming nightmare? That's gotta be one of the easier boost controllers to use... A good electronic boost controller is a really good idea to keep boost where it should be - no more than 10psi until you get the PowerFC.

Also, 400 hp and "reliable" don't fit together. If this is his daily driver/only car, that's a bit much to ask - if it's a weekend fun car, that's another story. You will most likely lose an engine at some point on the learning curve to big power. Even with everything done well, you will greatly reduce overall engine life making that kind of power. Yes, it can be done, but it's not an easy road.

Hope this helps some of your questions!

Dale

 

You really think the Efini twins can't handle more than 14psi??? I'm told people have run them at 19 and been running strong with them from these damn people that sell them. Relooking at everything, the BNR twins would have been the way to go, but it's too late now. Anyway, I agree I would like to get the stock system running properly, but I still think the car is in need of a Power FC. I dunno if it's the turbos themselves, but we've been seeing a steady 12.5 psi with occasional spiking all day long. I don't wanna mess with it all that much if the car can't deliver the fuel. I did mention the motor was stock, what do you guys think is max you can push it on the stock seals on a good tune??

The profec B spec 2 IMO is a programming nightmare. The original Profec B is where it's at in my book. As far as the 400 HP and reliable comment, I know, I told him the same thing. Fast | Cheap | Reliable. Pick any two. However, no it's not his DD.

Thanks for that tidbit though, it was helpful.