Rpeck

Your running 14 PSI with no fuel upgrades? no fuel pump, or larger injectors? I hope you have Wideband tuned this thing. "if" it is running right like this I am willing to bet your injector duty cycle is through the roof.

-Robert

DelSlow

iTrader: (2)

the stock turbo's effiency drops off after 13 psi, after that, your just producing heat. your probably making more hp at 12 or 13 than 15, especially with the stock tmic. so does anyone have one of the rrfpr's? is it a viable alternative to a set of injectors and an s-afc?

stinger

i made a little boo boo. it is actually running at 14.7psi=1bar.
the car runs rich actually. i'm always having to wash my exhaust tips.
i tried to load a picture, but, i think it was too big.

my favorite kill so far was a corvette, going UPHILL !!
man was he pissed!! never got withing 2 car lengths. every time he tried to come up on me i'd just keep stepping into it! sweet )

Rpeck

I don'y buy it, sorry. Based on Dyno tuning I have done with my car 720cc primary injectors, 1000cc secondary, ELP ECU upgrade, and a Walboro fuel pump there is no way in hell you can be running rich on the stock fuel system at almost 15 PSI. Get that thing on a wide band before you blow it. Soot on the exhaust tips does not mean it's running rich

-Robert

imloggedin

just buy a boost controller.. one of the options you asked about was how to bring the boost down.. just set it down to 10psi until you can afford the rest or buy it.

gsracer

hahahahahahahhahaha


:breathes:

hahahahahaha

So you're pulling 325 rwhp with a turboback and a cone filter on the stock turbo. Interesting.......

ilike2eatricers

Boost controllers cannot lower boost levels below stock (although we are not dealing with stock boost levels). What I am trying to say is that the point of a boost controller is to control how much the wastegate opens to bleed off extra boost to your desired level. You need to port the wastegate so you can hold your boost at a certain level.

SureShot

I'll bet the previous owner ported it.
I'll also bet that was on the 1st pull on a cold morning before the IC heat soaked.

I love cold mornings..

Rpeck

I still don't buy 15 PSI on a completly stock fuel system. When I dyno'ed I had to turn my fuel up above 12 PSI .. and I am running much larger injectors & an upgraded fuel pump.

I would love to see those A/F charts, infact the dyno would be interesting.

imloggedin

so your saying he cant used a MBC cause his wastegate isnt ported? i have an s4 with almost exactly the same mods and im running 8-10 psi steady with no ill effect, and no creep. from my understanding the wastegate is good till about 10psi on an s4. ofcourse i could always be wrong

NZConvertible

A boost controller cannot lower boost, no matter what other mods are done.

ilike2eatricers

With his mods the stock wastegate will not be able to hold down the boost at stock levels. The boost controller can only raise boost and cannot lower it past stock levels. With the mods on his car the boost levels are past stock already. In this case the boost controller would only raise boost which is not the wisest decision in his situation.

EDIT: You dont need to port your wastegate to use a MBC but it would be smart.

Digi7ech

iTrader: (1)

Yeah isn't a boost controller meant to raise the boost levels?

Also that guy with the 14psi on stock system with a programmed ECu doen't sound right. The injectors/pump start to struggle with fuel because they start to get near max after around 10-11psi.

Also who programmed your ECU? Almost no one does that for our cars. There is a guy currently looking into this but I think Higgins is the only one close to this. Rtek7 or something?

325 hp is pretty high since people upgrade to T04's to get in that range so your engine must be ported or something.

Anyways.
The stock S4 turbo tends to kill itself after 13-14psi. It isn't meant to boost that much. Also the waste gate is a single outlet design which will creep so you need to port it. You can go bigger than the flapper but make sure the flapper has no way of getting stuck in the hole.

Definitely get some fuel though. It's better to get bad gas mileage and run rich then lean and detonate your engine.