2.5 motor, 3" exhasut turbo back, no muffler, what kinda gain could i see removing the cat??
2.5 motor, 3" exhasut turbo back, no muffler, what kinda gain could i see removing the cat??
If the cat is in decent shape, not plugged, you might see a little gain. If the cat is original, old, plugged, or just in sad shape, you might see a lot.
Basically, it is hard to say.
10 or so maybe more
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from 0 to 216 is a pretty big gain! lol
It all depends on what power output your engine is producing right now.
Larry aka: 4cefed4 dynoed a before and after years ago, but I forget! I think it was 5-7whp going from stock to a catco, or catco to nothing...can't remember.
I'd say 5whp on a 200whp car would be my best guess.
Originally Posted by 22mopar
Steve
'90 VNT competition package Shadow - T-III SC6262 conversion/restoration
'91 Spirit R/T - white
'91 Spirit R/T - white
'92 IROC R/T - red
'67 Barracuda 273 now, 440/727 awaits....
ok, i dont think its plugged but my experience with cats so far been when they get older they just become hollowed out anyway after so many thousands of miles, my luck theyll go to pull it and its empty on the inside anyway, although its not real loud like id think it would be but it also has a resonator in line so that may be quiting it down a lil
5-20+ whp, depending on setup, cat size etc. Really hard to say. That cat looks old so it could be loose or tired, bang on the case, if it rattles, its done. Leave the resonator, vans need them otherwise they drone badly, especially with an auto.
Last edited by turbovanman²; 09-20-2008 at 05:16 PM.
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If the cat breaks up, it will plug itself as the pieces will lodge themselves iside, or worse...downstream at the muffler.
Originally Posted by 22mopar
Steve
'90 VNT competition package Shadow - T-III SC6262 conversion/restoration
'91 Spirit R/T - white
'91 Spirit R/T - white
'92 IROC R/T - red
'67 Barracuda 273 now, 440/727 awaits....
On the dyno... Gained 11whp and 22 ft lbs on the dyno opening the cutout in front of the Catco 3" cat to a dise exit exhaust. Car was making 290 unplugged.
Ken Adler....
Cars, A few (9)
most likely 50% was due to the piping and muffler loss, other half to the cat?
Originally Posted by 22mopar
Steve
'90 VNT competition package Shadow - T-III SC6262 conversion/restoration
'91 Spirit R/T - white
'91 Spirit R/T - white
'92 IROC R/T - red
'67 Barracuda 273 now, 440/727 awaits....
My shadow runs the same mph with open 2.25" DP or full cat-less 3" with Dynomax race magnum oval. I think a cat would slow it down.
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Pulling the cat off my 89 Daytona with a 2.5 gave me 3 psi more of boost which is about 20 HP given these cars typically average 7 Hp/1psi.
I seriously doubt that on my setup the cat is restricting anything. I drove around with the Exhaust off, and with it on and did not feel any difference between the two. Its a 3" turbo back with a carsound high flow cat.
is that just a funny angle pic or is that turn tighter than 90*? if so, why?
I am running a 3" down to Hi flow catco butt welded to a flowmaster race muffler. I have not dynoed the car but just ran it at the track. It ran 8.04 at 86.8 mph. Monday I will be removing the cat and gutting it then running a 3" pipe through the middle and re welding it. Sound like a lot of trouble but I live in California so I need to look legal. I will be taking the car to the track thursday and will be reporting the ET change on the car.
Okay cut off the car beat out the guts and installed a straight pipe through the cat. Reinstalled the cat in car. Went to the track tonight no other changes made to car. Last week I ran 86.8 at 8.04 after cat gutting I ran 7.7 at 91.4 so take that to the bank. Dont know the hp gain but what a mile per hour improvment.
Oh as for racing the lil red Mazi well he was a no show. Something about family time
AMOPARACER
Soccer practise for the 7 year old (lead coach pulled another no show so yours truly had to pick up the slack again.) TaeKwaoDo class for the 5 year old, then after that, race like heck to get the princess to dance lessons in time, then after that I spent a few quality hours of time on the Rampage, Line X in the am The wifey had a business meeting so Dad had full time shuttle service going...
BTW AMoparGazer, I think a 7.7x and 91 MPH deserves it's own thread and vids too. I was a bit more confident that I could MPH you when you were running 86... 91 is moving
AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
90 Masi 16V White/Ginger/Black
89 TC Masi 16V Red/Ginger/Black
86 GLHS #110 RoadRace Built 89 CSX-VNT Recaro Car
89 Turbo Mini 'Woody' 85 GLHT 'RedBox'
2014 Explorer DD'r 3.5Twin Turbo Ecoboost AWD and 500HP
My profile page has over 20,000 views, I'm somebody LOL