Ok.... Has anybody ever run with the exhaust disconnected just after the down pipe?? I'm talking at the track of course. I'm sure its loud as hell just curious if this will help e.t. at all!! Thanks.
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09-02-2009
Ok.... Has anybody ever run with the exhaust disconnected just after the down pipe?? I'm talking at the track of course. I'm sure its loud as hell just curious if this will help e.t. at all!! Thanks.
09-02-2009
Oh yeah, My rear O2 is turned off.
09-02-2009
it would not help.....IMO.....the stock cat back is rated for supporting 350WHP so it would not be of any gains other than the weight loss of the exhaust itself.
09-02-2009
A lot of people drop the catback at the track...your letting the car breathe more and getting rid of the weight from the catback...I'd do it if you don't mind bolting and unbolting the catback everytime you run it. And awesome...another '03
09-02-2009
It probably wouldn't be worth it at all on a near stock car. Now if you had a cam'd/ic'd car setup for the track, then yeah, it wouldn't hurt. It still sounds like **** though.
09-02-2009
Yeah I'm not sure if I will. Its got a 3.4 pulley,cai,shift kit,ubend delete and a aftermarket torque convertor. I not to much into it sounding like hell any ways. I really need it tuned more than anything. Thanks for the replies!!!!
09-02-2009
You need more than a dropped catback and a tune to get away with a 3.4".
I bet your knocking like crazy.
09-02-2009
Thats funny! It has no knocks at all!!!!Originally Posted by bluegtp91
09-02-2009
you scanned it and it has no knock at all?(KR)
09-02-2009
Yes sir! Although I wasn't at high speed when I scanned it. I tried to put it under a pretty good load in the amount of space I had. Should I go about it differently? Thanks.
09-02-2009
Lets put it this way the Record 10 second 1/4 mile, Intense Racing, Turbo GTP runs with the cat back disconnected.
This thing sounds like a jet.
YouTube - 10 Sec Turbo Grand Prix GTP
09-02-2009
that is also over 350 hp mark so obviously it would be restrictive at that point.....
09-02-2009
you will have max knock at high rpms just before you shift usually....that is where your boost will be the highest, so that is where knock is the most prevelent
09-02-2009
Sweet thanks. I'll try that. Maybe I'll get someone to watch it while I drive!
09-02-2009
I dont know how you couldnt have knock with no tune, no headers or plog/downpipe. You better check it again.......it almost has to. Most people knock some on stock everything or very light mods, let alone dropping the pulley size.
09-02-2009
I s**t you not! There is no knock!!!
09-02-2009
no one would believe me that I had no knock on my stock setup.....you wont notice it until just before you shift or over 5 grand on the tach probably. How can your setup flow that good with no exhaust mods except the u bend delete? damn, and I was worrying about having some knock with DP and plog with a 3.4 on DHP's pcm.......maybe your sensors are broke.....LOL...what are using to scan with?
09-02-2009
Its a Snap-On scanner. I'm going to try it again just to make sure! Hell who knows? It runs pretty strong for being up at altitude. I'm thinking of putting a higher octane fuel in it for this weekend,what do you think?????
09-02-2009
wow. if hes right on the whole no knock thing with the 3.4 then good on ya bro. like he said, almost everybody has knock with this setup. hell most people have at least a couple degrees even after a complete 3.4 setup and have to get it tuned out.
09-02-2009
Get a scan at the top of second gear...like around 70-90...that is where most KR is. If you have access to a tuner...aka DHP Powertuner or HP Tuners software that will give you a REAL scan and tell you what is really going on. I had KR with a 3.5" pulley with a ported front manifold, 3" DP, U-Bend Delete, 3" Catback, 180*, AL104's, DHP PCM, 1.84:1 Roller Rockers and a FWI. About 2-3* up top of 2nd.
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