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Old 09-02-2002, 11:18 PM   #1
rallytuned
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Question Scoobysport Downpipe vs. TurboXs Downpipe?

These two look identical .......... am I wrong? Are they made by the same vendor?

Which is better? Anyone using these downpipes? CELS?
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Old 09-03-2002, 02:01 AM   #2
kdawg
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I have the turboXS DP. It is 4 inches at the top (this is too wide for the stock turbo, but I don't think it hurts) and it tapers down to 3 inches. Overall, its HUGE! Quality is pretty good and I have not had any problems. I have bought the MIL eliminator (CEL eliminator) from http://www.ponyexpressperformance.com. This is supposed to trick the O2 sensor into thinking that the CATs are functional. I'll put it in soon. Also, turboXS gives a choices whether you want a cat or not. You can choose either the race pipe or the high flow cat. Overall, I recommend TurboXS.
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Old 09-03-2002, 02:17 AM   #3
SilverWRX02
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well I have scooby sport turbo back. so it includes the dp. it does trigger cel. but they have the electronic cel fix. not sure what it actually does

oh yeah also if anyone can elighten me on how this cel fix is suppose to work, that be grreeeaattt...
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Old 09-03-2002, 02:56 AM   #4
kdawg
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Apparently, if the cats are working properly, the O2 sensor will cause a certain amount of voltage change (probably is a drop). When the ECU is seeing this voltage change, it thinks that the cats are doing their job. I think the fix has a resistor and a non-linear circuit part (like inductor or capacitor) in series or parallel (not sure). This small circuit cause the correct amount of voltage change.

I hope this is right.
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Old 09-03-2002, 11:57 AM   #5
rallytuned
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ttt
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Old 09-03-2002, 12:11 PM   #6
Snowphun
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Quote:
Originally posted by kdawg
I have the turboXS DP. It is 4 inches at the top (this is too wide for the stock turbo, but I don't think it hurts)
How is it too wide for the stock turbo? It fits perfectly, and is designed to allow the wastegate gas to move quickly away from the turbo.

Paul
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Old 09-03-2002, 03:27 PM   #7
kdawg
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I think its too wide because 3 inch piping is good enough for about 500 HP (I think). And the WRX turbo is small so 3 inches provides plenty of space.

Quote:
Originally posted by Snowphun
How is it too wide for the stock turbo? It fits perfectly, and is designed to allow the wastegate gas to move quickly away from the turbo.

Paul
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Old 09-03-2002, 03:57 PM   #8
Sandkicker
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Scoobysport and TXS DPs are not the same. The Scooby starts with a nice bellmouth design and tapers to 2.5" and will easily replace the stock downpipe. The TXS starts with a wide bellmouth also, but the diameter of the pipe remains about 4" for most of the length of the pipe (while the ScoobySport seems to taper much sooner).

The TXS also will not work as a direct replacment for the stock DP. You'd need to get an additional pipe or two from them. I don't remember if it's just longer than the stock DP, or if it's just because it tapers to 3" (stock is ~2.5"). But I'm going with the scoobySport because it seems to be a better match for the rest of teh stock components, and I want to leave the last CAT in place (which i don't think the TXS will allow for).

I am also just replacing the Upipe and downpipe. If I were going to do a bigger turbo and 3" pipes the rest of teh way out, i might opt for the TurboXS, but I'm not going that crazy with the WRX.
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Old 09-03-2002, 05:36 PM   #9
Snowphun
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Quote:
Originally posted by kdawg
I think its too wide because 3 inch piping is good enough for about 500 HP (I think). And the WRX turbo is small so 3 inches provides plenty of space.

Have you taken a look at the outlet side of the stock turbo? If you have you'd understand why they (and others) have gone with the bellmouth opening. Another option is to use a divorced wastegate pipe, both are better than just butting up a 3" pipe.

Sandkicker: TXS does allow for a cat after the DP, though I don't know if you can mix and match with the stock cat or if you need to use thier high flow unit. I went with their unit, made for a very simple install.

Paul
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Old 09-03-2002, 06:56 PM   #10
kdawg
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I see what you are saying. I have taken a look at the outlet side of the turbo. I have a turboXS downpipe. Its just a little big for our small turbo. Don't get me wrong, I want the larger piping, but I would need a bigger turbo to use it to its potential. In other words, you are right.

Quote:
Originally posted by Snowphun
Have you taken a look at the outlet side of the stock turbo? If you have you'd understand why they (and others) have gone with the bellmouth opening. Another option is to use a divorced wastegate pipe, both are better than just butting up a 3" pipe.
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Old 09-03-2002, 11:25 PM   #11
motoxphil
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11.96, 1.64, 115mph!

Default The reason for the 4" pipe

I think many have lost sight of the reasoning behind using a 4" DP.

1. Reduce boost creep due to restricted flow out of the wastegate.

2. Streatching a 3" pipe to fit the entire outlet of the turbo makes the exhaust piping thin, causing reliability issues.

3. Smooth flow between the exhaust and the wastegate gasses before they enter the cat.

4. Smooth taper to prevent joining the gasses too quickly, causing turbulence and resulting in poor performance.

5. Any backpressure behind the turbo is too much backpressure.

Many choose not to use a 4" pipe due to the extreme cost in mandrel bending one.

Thanks,
Phil
TurboXS
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