NvrDwn

I just bought a high flow cat. Should I place it before my resonator or after? If I place it after the resonator would the exhaust be quieter? I'm think the exhaust build up before the cat would allow the resonator to do its job better.

Nick216

Place it where the third cat was.

justnspace

iTrader: (1)

nvr down, you confuse me sometimes.

you're all gung ho about power mods, and in general know what you're doing.

and then we get this gem.
lol, why do you want a high flow cat???!?!?!?

*edit
oh, i guess you want your exhaust to be quiet.
why not stack another resonator on?

sounds counter-intuitive that you're all about power mods but want to add a high flow cat.

NvrDwn

I'm not worried about a 3whp loss. I'm also doing it because of the smell. The wife complains when loading and unloading groceries. Since I came across an unbeatable deal what the hell lot. I barely beat a Ferrari 355 yesterday so I'm happy with losing neglable HP to stop hearing nagging.

Nick216

Did this Ferrari know you where racing?

NvrDwn

Nice try. 355 are mid low 23 second cars. Given my power and weight I knew I stood a chance.

justnspace

iTrader: (1)

oh, i know its negligible, just wanted to hear your reasons on why.

its pretty important to start off a thread with all details and information present!
(so, you dont get asked dumb questions, later on!)

Ilovemyvtx

Trade in your wife and keep the exhaust noise and smell, which is the smell of unadulterated manliness. She is trying to castrate what you were designed to do. Build fast as shit cars. When she complains about this, she will complain about the 3 rotor RX7 you want to build. Just saying...

justnspace

iTrader: (1)

^

Excelerate

iTrader: (1)

Did you delete the pre cats and third cat? If so weld it in where the third cat was. The cat will never get hot enough if you place it downstream.

anx1300c

iTrader: (2)

Ferrari F355's were 2900-3000 lbs and had 375-380 hp. Power to weight wise, they're on par with '11+ 5.0 Mustangs. A paraplegic could manage at least 112 mph traps.

You beat the driver, not the car.

justnspace

iTrader: (1)

LOL i looked up the stats as well.
quarter in the low 12s and traps like 122.


on a good day, we cant trap higher than 106mph

NvrDwn

Excelerate thank you that's what I need to know. Anx idk it sounded like it was really going hard.

anx1300c

iTrader: (2)

I'm only at 102 in normal DA. Gonna take at least 300 whp to hit 106 in these cars. Sonnick was hitting 104 in normal DA on 270 whp, but in a lighter car. Figure about 9-10 whp will net you 1 mph.

NvrDwn

Justin are you sure you didn't type in a 360? The 355 normally do mid low 13's at 107-109.

Just FYI my car in the 1/8th ran at 82.5mph and that was before PnP intake manifold polished tb a/c and p/s delete. I should run at 85mph in the 1/8th

justnspace

iTrader: (1)

idunno, it seems like anx and i both are looking at the same stats...
I read 375-380hp at 2900-3000lbs.
12.2 seconds at some insane trap number.

I need to take my ass to a track one of these days....

Excelerate

iTrader: (1)

You're welcome.

Eaglesfan9106

I agree with trading your wife maybe a upgrade to a newer model

Scottwax

I swapped a 455 into a '77 Cutlass, car had no cats. Barely failed Arizona's sniffer test so I had to get a pair of cats, put them in place of the mufflers. And it actually passed!

Emission standards are a lot stricter for newer cars though so closer to the engine, the better.

Grand_hustle17

Wow

Grand_hustle17

Not really... I think getting a bit more tq from a flywheel upgrade could net waaaay better mph... My nissan was untuned n probably making 260's low 270's n trapped 106mph... Up the tq n the mph will come too thats the cars biggest fault in my opinion

Scottwax

Interesting. Picked up 4 miles an hour in trap speed swapping a Carter 625 for a Holley 650 double pumper on my Chevelle. Wish I could spend $250 on my car now and pick up 35-40 hp!

I've also seen people pick up 1-2 mph through the traps using lighter wheels so you don't even have to add actual power sometimes.

I hate cars

Yeah, unfortunately those days are gone when you could do headers and exhaust on a big block and pick up 100hp. I remember picking up 4-6mph just from locking the converter when my car was all stock and would fall on it's face at 4,500rpm. The valvesprings were shot and locking the converter kept the rpms down where it made power. Good for 110mph traps on a stock car with a few lbs of additional boost.

Excelerate is right about cat location plus it's illegal to move the cat farther downstream than it's original location not that it matters here.

anx1300c

iTrader: (2)

Those 5/5.5 G Maximas only weighed low 3200's right off the showroom floor though. With equal power, a 5.5 G Maxima has a solid 3 mph advantage over a 3G TL due to the weight advantage. Plus, the Maxima is geared a bit deeper as well. The TL would benefit from a deeper gear set more than a lighter FW IMO. Of course, first gear would be even more useless on the 6 speed cars.

Your numbers sound about right for 106 mph traps in the Maxima. There was a guy, Sparks03Max who was running 12.7 @ 108 or so on slicks with around 285 whp.

kingkong_dav

Y would u do this. Wow thats cray cray

I hate cars

As much as I love low end torque, it's the power that brings the mph.

anx1300c

iTrader: (2)

+1

Carroll Shelby once said "Horsepower sells cars, torque wins races." If that were true, the BMW 335D, at 265 hp/425 lb ft should be faster than the 300/300 335i, but the 335i is still significantly quicker. Granted, the 335i is making more like 330/340 and the D is probably rated more inline with its true output, but that 425 lb ft isn't making it faster.

Torque is great for that initial shove in the back and to not have to downshift, but horsepower is what wins races.

NvrDwn

That's why you can have a Honda engine with 300hp and 210tq and run 12-13 all day.

HP is what makes that speedo move and torque is how much of the acceleration you feel.

I hate cars

For what it's worth, higher low end torque cars are usually easier to produce a good ET than a high revving low torque car of the same power.

My GN hits 600lbs of torque before 3000 rpm. That means it's going to be making more hp at a lower rpm. This is how I've beat Mustangs and Vettes taking off at part throttle just to feel a little push in the back without knowing they were racing me. More power under the curve.

I still prefer to have good low and midrange torque in a street car. The TL frustrates me because I have to downshift two gears just to maneuver in traffic.

Scottwax

I had an '02 6MT 5.5 gen Maxima. Definitely a quick car. 3224 lbs and the VQ35 has that fat midrange power. Would have got another one when mine got wrecked if I could have found one.

On the other hand, Honda/Acura build quality is better, interiors are nicer, much quieter inside, higher resale and better gas mileage.

Scottwax

Torque is the power the engine makes, horsepower is how quickly. And the quickest cars are those that make good top end power and have a nice flat torque output.

I hate cars

Torque is measured, hp is calculated. Hp is torque over time. Say you have a perfectly flat torque curve you will make more hp as the rpms go up because you're getting more power strokes in the same amount of time.

Scottwax

Just FYI, the third cat is not particularly restrictive, even with 144,477 miles on it...

I hate cars

Agreed. I gutted my stock 3rd cat when the car was new. No difference in power that I could feel. I wouldn't do it again.