06black

i posted the other day about what seems to me like a missing amount of power in my car....
i used to be able to spin the tires in 1st pretty easy and now it just seems like the car hooks up and goes....but the tires and the car have more wear and tear on them now they they did last summer so i'm tryin to see if some way my 3in exhaust i had made for the car is costing me power some how.


any info would be a big help

3fo893013L

You don't know how to drive. That's what is costing you power.

Chevypowered

with a 3" exhaust you will loose some low end torque. When i got my header and 2.5" cat-back installed i felt a good decrease in off the line power and a slight increase in top end. I then installed my 2.7" and i was 100% happy again. I would gues thats what has happened to you.

1stbluSS

3 in is a little too large for our cars.... whether you are losing power or losing tranny that is up for debate

06black

your a real pain in my ass you kno that mike



p.s. you missed an awesome time at rice eaters place bro....it got better and better as the night went on

06black

i'm runing the 2.9 and i know i've got a big bump in top end power cuz i can pull on just about anybody but that low end grunt was kinda fun to have.....what cause's this pipe size to do that?...would steping down to a 2.5in st up be better?

05BlackCobaltSS

Yes, a 2.5 in. system is the best setup for 98% of us. Of course, unless your going to produce upwars of 450-500 hp, you don't need a 3in. exhaust, it just robs power.

But, i'm not sure why your car wouldn't be spinning the tires....that is really odd.

BTW: Please don't double post like that, i know you asked about your exhaust, but it's on the same topic as your other post.

FAST06SS

Here is a theory for you, EXACT same thing happened to me! After i installed my Corsa, i felt like i lost power as well. Long story short, it was the CLUTCH!! I was slipping and i didn't know it till later. Installed the new clutch and now i have my 50mph nail it and break the tires loose back again!

cartercar

i was told from an exhaust company in utah, unless you have 400+ hp no need for the 3inch you loose bottom end tq. but gain a little in top speed is all

3fo893013L

would have stayed but girlfriend had work. I barely stayed up as it was to get home.

R33P3R007

That is why vibrant hasn't been released yet. they lost power with the full three inch setup. they are retrying it in 2.5 and 2.75 to see. hopefully they will find gains somewhere.

06black

this is not a dubble post to who ever said that...the last post was to try and find the problum and this post is to see what needs to be done to fix it

any who.....

if i leave the 3in pipe and put a more restrictive muffler on it would that help?

if i go back down to a 2.5in set up with the top end die out?

also to the people who are finding they have clutch slipige....could you tell by driveing? my car seems to lock up and go pretty good....i'm doing a clutch any way and i hope its that i just dont think so

korax123

I didn't feel a power loss with my 3" set-up

FAST06SS

I never noticed the slippage until it got worse. I just didn't blow away the tires at will around 45-55 mph like it used to. It still put me back in the seat pretty good though. Thats why allot of people don't realize they have slipping clutches!

victory_red_SS

iTrader: (2)

I also felt no loss with my 3" exhaust. I can burn my tires off all the way thru 2nd if I so choose.

06black

well to me it sounds like that new clutch cant come fast enough

zinner

Before and After Dyno, stock exhaust and 3 inch mandrel bent exhaust.

R33P3R007

Did that include a new header or just 3 inch mandrel bent catback?

zinner

just the cat back. stock header and downpipe.

zinner

It is possible that your exhaust is losing power for you car 06black since they are all custom they are all different.

Nocturn

Well in theory the exhaust is to large, and the gasses are cooling inside the exhaust pipe and expanding, thus slowing down the newly released gasses from the engine, ironically you created more backpreassure by going with a larger diameter pipe. 3" for a 2.0L is really to big, I have dual 3", but my engine is a 6.6L.

06black

i have been raised around big moter cars...my dad and the rest of my family have always been into cars....older cars to a point all with big moters and i've always been told that on a F/I moter the less back pressure the better.....unlike a NA moter....so i thought by goin to a 3in i would never have to do any thing to the exhaust agen....at this point i'm willing to bet more and more its the clutch from some things i have noticed out of the car but this topic still makes me wonder....


thanks for all the help guys keep it comeing

Nocturn

Thats true on Big motor cars, not on smaller cars putting out stock power. for a 2.0 putting out less than 400 some odd HP 3" is to large, on a 5.7 or larger with FI the bigger the better because of all the air going in, think about it, the engine itself puts out almost 3x what the 2.0 does, adding on a FI is only going to make it shoot out more air and need larger pipes.

STi_WRX02

If ur stock or close to stock, then 2.5" will be more than enough. When u break 300whp then a 3'' would be called for. But if you insist on 3'' make sure its catted. a cat will help retain a lil back pressure but not much. But if you're losing power...add a pulley hahah! that's make up for the hp ur losing.

maxpit

I know its a little off topic but "downpipe" is a term used for the pipe that connects the turbine to the cat on a turbocharged car/truck. I n some applications there even up pipes ex: WRX. We dont have a turbo therefore dont have a down pipe.