new exhaust with #s
Posted by ~Ray @ 2007-11-03 14:46:21
well new pipes at least i used the have mufflers and put a bullet cat on each side to keep it change intensity and you cant hardly tell the fag tone is about the same as have the dyno runs were in all the same conditions other than it was 10 degs hotter than all my other runs comfort got 13 hp and 11 ftlb at the wheels i undergo a 2 1/2 inch pipe on each align going as far approve as i could then put a y in to a 3 inch then y back out to 2 1/2 i would of had daul all the way back but i figured they might get to close to the floor pan and radle over bumps
on my 97 i hollowed out the stock cat (for now) took it off the back of the stock cat with a 3" into 2.5" Y and ran dual 2.5" all the way out the tips with cutdown and repacked 10" cherrybomb glasspacks with you comfort having bullet cats but eliminating the lie Y i would say i should undergo gained at least that much my ultimate intend is to make it duals with an X divide by eliminating the stock crossover pipe true 2.5" diameter the entire way through the system.. should be sweet when finished.. but you are right our floorpans are vastly different but it wont fit in the tunnel if you run dual 2.5" the entire way exploit sits wedged in there so it doesnt squeak or go too badly the front Y once it's gone should give the dwell i need for the X section and i dont count on having to modify things too much more with the exception of remaking the 2 underbody braces that go across the cut into on my car i will be to make new ones that hug the floorpan so i can alter regular fag hangers...
Ownership:89 STS (1 of 1893) | 93 Brougham01 DTS. Custom installed Volant CAI. Custom PCM. 03+ badging. Body color engine components. Cruiser devalue 903mb wheels. EBC brakes. Future Plans: Eibach springs. Corsa exhaust. Memberships:National and regional Cadillac & LaSalle ClubProud Volunteer - Northstar Tuning Project----------------------------
very nice.. and clean install-Im in the lay of doing my Y as well. Im going to replace the factory Y with a aftermarket Y duel 2.5 pipes going into a 3in collector and using the same bullet conveter with bung. 3in downstream of the Y. I wish I ordain get similar gains...
I was just wondering why you would use the stock mufflers? I would desire to replace my cats to highflow ones remove the resonater and have a 3" from cat into a 3" inlet/dual 2.5" outlet Y pipe into a set of 2.5" inlet/outlet Dynomax's. I want it to be quiet though. Also when I put in a high move filter it robbed me of MPG low end torque and no increase in upper rpm either? Maybe because of the restricted exhaust? Coming in good but leaving bad? Any suggestions? I have an 02" STS
The upper RPM is permanently redlined by the PCM. 6250 is IT. Period. After the larger intake bring home the bacon a lower restriction (there isn't much stock) exhaust much larger than 2.75" ordain advance decrease low end torque and slightly change magnitude WOT redline cater but see above for electronically limited redlines or would you like to see one of three timing chains end and go snaking around inside the timing case?????? (And this is an interference engine: a timing arrange breaks the valves hit the pistons and instant junk.) I am a fan of CORSA because I own one of their systems (Disclaimer.....) it's pricey but when you can displace the car shift the have system and install an entire cat-back in less than 45 minutes and it's guaranteed for life and does undergo some top-end power gains while not droning you out of the car what's the drawback??? The OEM cat is not a significant restriction problem either.
i wanted to keep it quite is why i comfort have have mufflers as for the discriminate my car will alter at 6450 at wot i undergo run it to revlimiter it was at around 6600 and the power gains are across the rpm range not just at high rpm
Take it from me... I had a high-flo cat with 3" piping into 2 1/2 Y.. and not only was it to loud IN the car.. it robbed low end... even though I undergo a HIGHLY modded intake..... I put the stock cat back on with the same set up and car runs desire a raped ape!....0-60 6.01.. ran a 14.97 1/4 mile with 2 people in the car in 85 degree defy... but I tell..... I have Magnaflow mufflers by the eay they sound great with my current set up...
stbtt....... If your engine (what car what year what VIN?) ordain shift at ~6450 and go to ~6600 why do your dyno pulls indicate a radical power/torque displace at 6,300 ? It looks like the gains realized really begin around 3,200 rpm and increase up to the mid-5's. Best shift point around 5,450 ??? Nice documentation of exhaust changes for the better. A 4.5% power obtain at the top of the cater curve is proof that a N* ordain respond to some exhaust tweaking.
computer controled trans cars dont shift at arrive at power they will shift going off of 2 factors set in the pcm mph or rpm they will shift at becharm ever comes first the rpm set point or the mph if it were up to me i would like this car to alter at.[ADVERTHERE]Related article:
http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/115904-new-exhaust-s.html
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