Putting on a test pipe tomorrow...what to expect.

[Snorman]

I pulling off the cat tomorrow and putting on a test pipe for the track.
Will I see an increase in boost without touching the wastegate actuator, or does the benefit simply come from a more free flowing exhaust?
S.

 

[pvtpilot]

I just put on my hooker exhaust and replaced the cat with that nice pipe they provided and I got more boost out of my turbo. I don't have my boost gauge installed yet (its actually staring at me right now) so numbers are questionable because of the stock led gauge. I can tell you according to the leds it went from ~15 to a red led at wot (I wish i had numbers for you ) and was definately making more boost because I had a lot more knock then usual. Granted thats a big jump.. from stock to no cat and aftermarket exhaust but I figured I'd give my 2 cents. A friend of mine (sleeper-6) lost 4 mph in the big end @ englishtown when he put his cat on to pass emmissions. I haven't been out to the track since the change so I have no new numbers to compare. HTH

 

[UNGN]

Boost will likely go up, the car will spool quicker and leave harder. Wheels spin may become a bigger problem and your mph should go up in the 1/4 by atleast 2 mph, probably more.

 

[spining 6]

zoom .zoom, zoom.

 

[grey1]

meanerrrrr sounding!!!

 

[TRBON8R]

Unless you have a torch to help remove the old stock cat I'd expect you to have a lot of fun trying to get the cat loose from the downpipe. Oh yeah, I remember that being a lot of fun!

 

[DCVING 6]

My testpipe pushed my exhaust up into the floorboards under the passenger seat. exhast shop did a crappy job of hanging it. What a waste of money.

 

[UNGN]

I bought a used stainess ATR stock replacement downpipe and test pipe and threw the welded together downpipe/cat in the trash (where it belonged). I had to jack the back end of the car up 18" to get the damn thing out in one piece. Next time I try that on a car, it will be in two pieces, even if I have to rent a sawsall.

 

[turboman38]

You will have more boost, better acceleration and better fuel economy. Any restriction taken out of the exhaust should get you those three things all the time, especially in a turbo car.

 

[scottyb]

I don't recall a significant change in boost. But I did get better spool, > 3 tenths, and > 3mph in the 1/8.

 

[jojo]

Ok here we go!!

1. Boost was set at 23# with test pipe on.

2. Didnt touch a thing.

3. Took off the test pipe and installed a Random Techs High Flow
Cat, for smog that day.

4. Drove down to Smog Busters (with boost still set@23#) like i
said i didnt touch a thing.

5. Opened her up.

6. Peddle mashed to the floor.

7. Boost would not go past 19-20# (one of those two cant
remember, but on of them)

8. Proof of what the so called (High Flow Cat) did when i installed
it.

9. Bottom line- i lost about 4# of boost when the cat was
installed.

10. Another bottom line

11. Cats suck!!

12. And so does 91 octane fuel

13. But keep in mind i have a hooker free flow exhaust with
Aero Chamber Mufflers and a V4. That little combo will
also add up.

14. And yes the 44 spools like a son of a ??

hope that helps

jojo

 

[Snorman]

Okay...
The test pipe is on and so far, I don't notice any real increase in boost. However, the turbo is spooling quicker and it "feels" like it's got more ass in it.
Tonight will be the test.
S.

 

[scottyb]

Originally posted by Snorman
Okay...
The test pipe is on and so far, I don't notice any real increase in boost. However, the turbo is spooling quicker and it "feels" like it's got more ass in it.
Tonight will be the test.
S.

They say that if the butt dyno registers a change, it's at least 2 tenths.