gutted JSPEC DP, 4" mid pipe and 4" cat-back

 

4" exhaust vs. 3" exhaust nets maybe 3 hp at peak rpm

waste of money

 

I got the bigger one so that my cat doesn't get stuck in there at night..and when i fire her up in the morning, kitty has a better chance of scampering out in time..heh hehhh

 

can some one explain what 1.2 on the O2 sensor means

 

1.2 volts..





(guessing)

 

That's pretty sweet, but I would hate do that in front of the local authorities. What ECU are you running and do you have your injectors running on deacceleration?

 

nice flames !

 

I never really understood the whole shooting flames on purpose thing... Not like it enhances performance... If anything it takes away from..

But that's just me. I'm sure lots of full exhaust FD's will pop some nice ones, but I'm sure not going to tune for fire... LMAO

 

Another member from Trinbago

 

From what I understand it's not just the gas, but when you burn it... Or in other words, spark makes a difference too...
If you retard the timing to the point where the plugs fire at the last possible second, the wave of flame is still expanding while the fuel rich mixture is traveling into the exhaust manifold/turbo housings, which are "Hopefully" red hot, and will jdhuegel1 cause increased performance due to the turbine wheels getting pushed around with the expanding flame of the exhaust and causing a rapid rise in Turbine Pressure, although at an initial loss in HP due to the retarding of the timing... so it's then up to you weather you use the charge you just got out of the increase in turbine pressure... of course the side effect is the fireballs out the tailpipe...
so as I understand it if, you tune to retard timing upon letting go of the throttle, and reducing fuel minimally , you should shoot huge flames... if you cut fuel incrementally with spark you should see pops, like in the video... (It's tough to judge the length on the video..) This is all of course if you have a tunable ECU...

-DC

 

Hehe, I'd love to bring your car in for an emissions test and I want to see the look on the smog tech's face when the car starts shooting flames.

 

I was referring to the "pig rich" aspect of the whole thing... If you crank the fuel, you'll get the same thing... Too much fuel = lack of performance.

I understand your post. Thanks for the info.

I'll still tune to perform though.

 

I'm running a PFC. It's just tuned rich .. not planned or anything though..but I'll tell you something, even before I had the PFC when I put the exhaust on it would shoot flames and .. sorta' hard start in the mornings. In the mornings, if you stomp on the gas before it woke up properly.. man.. loud loud pops and flames .. other guys are running the same PFC map I am using and don't get the flamage I do.. which leads me to believe .. it's a function of the exhaust being so big and my 1600's are dumping so much fuel that when it hits the hot exhaust it ignites.. note - this only happens if the EGT is over 500 deg C. I can rev and back off as much as i want but if the EGT is below 500 deg C.. nothing.

 

thats a pritty huge exhaust tip, wut kind is it?

 

nice flames

 

wait a minute... are you serious?