Loss of low-end power after installing exhaust

[scottypimppin]

I have a 98 eclipse rs and i put a apexi n1 exhaust on it and i feel like i lost alot of low end power on it its 60mm pipe and 115mm tip????

 

[VelocitàPaola]

I have a 98 eclipse rs and i put a apexi n1 exhaust on it and i feel like i lost alot of low end power on it its 60mm pipe and 115mm tip????

The difference in size between 60mm and 2.25" (the stock exhaust piping diameter) is about 0.1"... The difference you feel may be due to the fact that the N1 muffler is less restrictive, but I doubt you experienced any actual loss of power.

 

[scottypimppin]

it feels like it i went to the track and i ran a 17.9 i almost wanted to junk the car all i have dont to it is greedy header, apxei n1 exhaust, aem cold air intake and a down fall its auto tranny

 

[VelocitàPaola]

Maybe you should actually take it to the track or a dyno... "Feeling" performance gains isn't too accurate.

 

[scottypimppin]

i did i ran a 17.9 i got the slip in front of me

 

[mindset]

i did i ran a 17.9 i got the slip in front of me

He's not doubting your time, just explaining that you can't tell if you've gained or loss power because you "felt" it.

Running a 17.9 seems accurate. It's N/A. But considering I know nothing about 420a's I can tell you what could be wrong from knowledge about cars. Think about it, you could have a slipping torque converter messing up the times. But I highly doubt that's the problem. You can't expect your car to go fast after putting simple breathing mods on.

 

[scottypimppin]

would another rez help the low end ??

 

[VelocitàPaola]

Probably not. Did you remove your catalytic converter?

 

[scottypimppin]

no theres an hi flow cat on there

 

[VelocitàPaola]

no theres an hi flow cat on there

An actual high-flow cat, or an eBay "high-flow cat?" If you can see right through it, it's not a catalytic converter...

 

[scottypimppin]

its a real one magnaflow

 

[Fotowntalon]

I posted this in another thread, but "high flow" cats are just code for a pipe thats outside is shaped like a cat. Chances are if it is really high-flow it came with something saying "for off-road use only" or something along those lines, pretty much stating you won't pass an emissions test.

But back on subject, not really sure how its possible to lose power by installing an exhaust, unless somehow maybe you didnt re-install the 02 sensor right and it is throwing your ECU outa whack. Or there is the chance that something bad happened in your engine at the same time as your isntallation, although unlikly.

Like VelocitàPaola said, feeling something, loss or gain, can be rather inaccurate, unless of course it is gigantically obvious.

 

[SnoopySLR]

like everyone is saying, pop it on a dyno if you wanna know if your HP went up or not. An exhaust is gonna make a difference, but its not gonna be like throwing a turbo on or something. I know I didnt notice a thing on my mustang when I put my new exhaust on it. (I cant say for the talon, cause I did 10 other things when I did my exhaust)

You got your exhaust breathing good now, toss on a bigger TB and maybe send your manifold to get ported. I know I felt a monsterous kick in the bumper when I did that.

 

[pboglio]

Without engine management, the a/f ratio or ignition timing could have been affected. Happened on my 97 GSX turbo when I installed a low restriction exhaust. Once I installed an engine management system, swapping to huge exhausts had little to no affect on the bottom end at that point. I had this very discussion with Dave Buschur when I installed his 2.5" catback some 12 years back, and he suggested what I stated. N/A's are alot more susceptable to changes in exhaust tuning.

 

[Slow96Eclipse]

same problem. i just put apexi muffler on and feels slower...

 

[mindset]

same problem. i just put apexi muffler on and feels slower...

It's a fart can?

 

[barza21]

Have you ever taken your car to the track before this run?

As everybody else is saying, feeling a power change is a tricky business. The first time I pushed my engine to red line after the rebuild I felt the car slower, but when I took it to the track it was a completely different result. I was .6 seconds faster after the rebuild eventhough my butt dyno was telling me other wise.

I consider myself consistent on my 1/4 mile runs, but then again that's IMO.

 

[Fotowntalon]

A shot in the dark, but couldnt a different HP to Torque ratio make a car feel slower? I mean Drive a ford F350, those thigns feel like they could run 10's with their monster torque, but in realty it overshadows the HP and the truck aint that fast. I find torque makes a car feel fast, but HP is where the gogo is.

Basically asking if you add more HP without getting much torque gain, could it make your car feel slower, or could i be completly be wrong on this statement?

 

[scottypimppin]

mines a full catback exhaust

 

[AWDTSIer]

Convert your 420a to a turbo 420a, that should solve your problem

 

[miniturbo23]

What did you run before?? like they said the feeling is one this but numbers is what shows it all.