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Old 06-03-2002, 09:00 AM   #1
rupteur7000
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02 2.5RS
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Default few Q's

i am soon getting a Ludespeed stage I, so i am going over everything 3 times a day to make sure i am ready to do this.

quick questions:

-i know have a 2.25" cat-back, what should i do? i was thinking of getting the piping redone to 2.5 or 3" but i want to keep the rear section as it looks very stealth (important factor where i live)

- that is going to sound very n00b, but i am gonna have to ask it anyway, can i, as a very patient guy, learn and tune my own fuel once i get the kit? i don't know much about cars, but i have found it pretty easy to find my way into cars engine with some common sense.

i not really looking into serious performance, just something obvious to start with, something to learn about.

Q
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Old 06-03-2002, 11:06 AM   #2
wcbjr
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The kit comes with a 2.5" downpipe, so I doubt your 2.25" exhaust will work very well. If the flanges mate up, there will be quite a bit of blockage for the exhaust gases passing from the downpipe to the midpipe. Ludespeed's website also says that the kit requires a 2.5" exhaust to perform as expected.

If you want to be able to adjust the fuel correctly, I would suggest getting either an air/fuel gauge or an exhaust gas temperature(EGT) gauge, and a fuel pressure gauge. The Cartech RRFPR has a few adjustments that you can use to tune depending on what your gauges are telling you. It's up to you to find out how much fuel you need at any given point, though.


Charlie
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Old 06-03-2002, 11:16 AM   #3
Jon Bogert
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Quote:
there will be quite a bit of blockage for the exhaust gases passing from the downpipe to the midpipe
It will work just fine. I have a 2.5" downpipe into a 2.5" cat into a 2.25" cat back and STi muffler running 6 psi. Does it build boost slightly slower than a 7" sewer pipe exhaust? Perhaps. Will you even notice running Stage 1 levels of boost? Nope. My EGTs are perfect, too, so backpressure is not excessive.
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Old 06-03-2002, 11:21 AM   #4
wcbjr
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That's good to know, Jon. Thanks.
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Old 06-03-2002, 11:56 AM   #5
rupteur7000
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thanks for the answer Jon.

another Q

if i ever run into problems tuning my fuel, is it doable to just "copy" the way another similar car with same kit and setup? or is that unsafe?
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Old 06-03-2002, 12:22 PM   #6
Jewbaru
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Quote:
Originally posted by rupteur7000
thanks for the answer Jon.

another Q

if i ever run into problems tuning my fuel, is it doable to just "copy" the way another similar car with same kit and setup? or is that unsafe?
To an extent, but not for ultimate performance. No two cars will perform the same, so it's alot of trial and error. My best advice, start rich, and gradually lean it out over time. If you're overly rich for a long period of time, you'll toast your O2s ($80 for the front), and maybe foul the spark plugs ($7 a pop at most?), but that's better than detonating a piston to peices (can get into the thousands).
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Old 06-03-2002, 01:31 PM   #7
rupteur7000
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thanks jew-- i am gonna try and be safe, it is hard sometimes. how hard is it to tune fuel without a butt dyno or even a regualr dyno?
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Old 06-03-2002, 02:03 PM   #8
Jewbaru
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Quote:
Originally posted by rupteur7000
thanks jew-- i am gonna try and be safe, it is hard sometimes. how hard is it to tune fuel without a butt dyno or even a regualr dyno?
When you hear detonation, you're too lean. Without the proper guages, etc, don't try to tune for power. Even running stupid rich, you'll feel a large power gain over an NA RS.
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Old 06-03-2002, 02:44 PM   #9
rupteur7000
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should i find someone with a dyno to ba able to tune right somewhere in the middle ground of performance vs. safety? i am getting a J&S ultraguard, egt, fuel, boost. that is it for now, maybe a standalone in the long run.

i am bored with my car being NA, i never really have to do anything to it, i need something to work on to keep me occupied, i figured going FI should do it.
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Old 06-03-2002, 04:02 PM   #10
Jewbaru
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Lucky you, you're in the NE so you should be able to find a 4WD Dyno.

You can't really tune with just a RRFPR, with the dyno, you can get it damn close, but not perfect. I'd recommend staying safe till you get the J&S and guages in, then strap it to the dyno for some real tuning.
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