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JordanWhiteMusic.com
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Discussion Starter #1
Do our ECU's need to "learn" cat-back exhausts? I ask this because I got my custom exhaust installed early Monday, and now I just got home from driving around and the exhaust seems LOUDER and the car seems faster than before, especially up top past 5000rpms. If you guys have cams and have the stock exhaust, GET AN EXHAUST! I never thought I'd feel this much of a difference with one. I guess my engine was really restricted by the stock piping and muffler.

Anyhow, what do you guys think? I know the ECU learns other mods like cams and stuff...but what about exhausts? I'll tell ya my car is definately louder than it was yesterday. Maybe I'll unplug the battery overnight just to see what happens.



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Jordan White (Stormy)
'98 SE(R) w/ HS CAI, HS G3 Header, Custom 2.25" Exhaust, JWT s4 Cams, UR Pulleys, KYB AGX's, Eibach Sportlines, Courtesy STB's, ES Mounts & shifter bushing, PWST X-Drilled Rotors w/ Axxis MM Pads, 17" Borbet Type S's w/ 205/40 Kumhos, Nis-Knacks goodies
 

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El Chingon
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892 Posts
I don't know, but when I put my GReddy on, I felt the same way. At first I was like, OK, yea. But about 150 miles later I was on the freeway and I shifted from 5th to 3rd to pass and I was like dayam!!!! It felt GREAT!! So what kind of muffler are you running? You have the PS B-Pipe, right?

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David
'98 Super Black SE w/stuff
 

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JordanWhiteMusic.com
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4,699 Posts
Discussion Starter #3
<font face="Verdana, Arial" size="2">Originally posted by nsracer:
I don't know, but when I put my GReddy on, I felt the same way. At first I was like, OK, yea. But about 150 miles later I was on the freeway and I shifted from 5th to 3rd to pass and I was like dayam!!!! It felt GREAT!! So what kind of muffler are you running? You have the PS B-Pipe, right?
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Yep. Think about it, I had a Hotshot header, Hotshot CAI, the S4 cams, and a STOCK EXHAUST! And we all know the B14 is exhaust is the most restrictive of the SR20's.


But yeah I think I have the most complicated exhaust system ever. Get this:

Starting at the cat, working towards the back of the car:

1. 2.25" Pacesetter B-Pipe, connects to:

2. 2.50" Custom piping, then goes to

3. 14" x 8" straight through universal Pilot muffler, finall finished off with

4. 3.5" Brospeed tip

I opted for the second half of the exhaust to be 2.5" because it had to be crush bent. I figure 2.5" crush bent is the same or close to 2.25" mandrel bends.


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Jordan White (Stormy)
'98 SE(R) w/ HS CAI, HS G3 Header, Custom 2.25" Exhaust, JWT s4 Cams, UR Pulleys, KYB AGX's, Eibach Sportlines, Courtesy STB's, ES Mounts & shifter bushing, PWST X-Drilled Rotors w/ Axxis MM Pads, 17" Borbet Type S's w/ 205/40 Kumhos, Nis-Knacks goodies
 

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All I know is now you'll be in the 14's no question!
 

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SR20 Enthusiast
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480 Posts
I don't think tha the computer learns the fact tht you have an exhaust or not. I think that by doing everything else first the exhaust became the choke point for the engine to breathe, especially if you had cams, header, cai, and no exhaust. You probably weren't realizing all of the potential of all the other parts. The power gain you are feeling should definately be way more than if you had done the exhaust first. You should feel more of a difference the higher up in the rpm's you go. Enjoy, and remember: "you can only eat as much as you ****!" (relating to you can only suck in so much if you can't push it out too)

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98 200SX SE-R custom cold air by Andreas, AEBS header, Greedy exhaust, JWT motor mounts, UR pullies, Nismo fuel press.reg, JWT C1 cams and JWT gears, Valve springs and titanium retainers, ACT HD/PP, Clutchmasters flywheel,Sprint spring/AGX combo, no cat, custom JWT computer w/cam program, Bored airflow meter, and a best ET of 14.78 @94.8mph on street tires with full interior and no limited slip diff!
 

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JordanWhiteMusic.com
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4,699 Posts
Discussion Starter #7
<font face="Verdana, Arial" size="2">Originally posted by dougnosser:
I think that by doing everything else first the exhaust became the choke point for the engine to breathe, especially if you had cams, header, cai, and no exhaust. You probably weren't realizing all of the potential of all the other parts. The power gain you are feeling should definately be way more than if you had done the exhaust first.
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Most definately. After say about 5000rpms the car just pulls alot stronger, it reaches redline quicker. I bet if I had done the exhaust like first or just with the CAI I wouldn't have felt much at all.

Pulleys are on order.....all I need is an ECU now......


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Jordan White (Stormy)
'98 SE(R) w/ HS CAI, HS G3 Header, Custom 2.25" Exhaust, JWT s4 Cams, UR Pulleys, KYB AGX's, Eibach Sportlines, Courtesy STB's, ES Mounts & shifter bushing, PWST X-Drilled Rotors w/ Axxis MM Pads, 17" Borbet Type S's w/ 205/40 Kumhos, Nis-Knacks goodies
 

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JordanWhiteMusic.com
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4,699 Posts
Discussion Starter #8
Here's some more of the exhaust impressions:

I can chirp the redline 1st to 2nd gear shift now everytime. And the chirp is more of a peel rather than a quick one. It's much louder and bigger. I guess thats another way to tell I'm making more HP with the new exhaust?

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Jordan White (Stormy)
'98 SE(R) w/ HS CAI, HS G3 Header, Custom 2.25" Exhaust, JWT s4 Cams, UR Pulleys, KYB AGX's, Eibach Sportlines, Courtesy STB's, ES Mounts & shifter bushing, PWST X-Drilled Rotors w/ Axxis MM Pads, 17" Borbet Type S's w/ 205/40 Kumhos, Nis-Knacks goodies
 

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Originally posted by dougnosser:
"you can only eat as much as you ****!"
That quote is absolutely correct. On the otherhand, when I got my exhaust I did not notice any difference. I even felt like my car was a bit slower. That is because all I had was a k&n air filter. With just that upgrade and going with a bigger exhaust most likely made me loose some torque. If I would have had all the rest of those other modifications there would have definitely been a difference.



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k&n filter,g3 hs headers, no cat,greddy,fpr,jwt motormounts,54mmAFM,stage3 clutch,jwt flywheel,jwt s3 cams,aerospeed springs,konig tuners, 15.1 @ 91.6, no LSD
 

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You couldnt chirp em before?! Who taught you how to drive!!! J/K!

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Ryan Walsh, 1997 200sx SE-R w/ ES mounts, JWT s4's, AEBS 4-1, PR CAI, Sportlines/AGX's, Bridgestone re730's, Matrix FSTB, Stillen GTR grill
 
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