Exhaust help

[Gotian]

Originally Posted by Igovert500

Yes you want smooth. Leaks, or uneven piping, or anything else that causes turbulence screws up the flow...creating bottlenecks or restrictions.

As far as you getting higher gas mileage, that probably came with the accompanying tune that you should have gotten when you installed larger injectors. Most cars come pretty rich from the factory, to be safe from knock. When you add larger injectors, generally you add some sort of air/fuel controller or swap/alter the ECU to account for the extra fuel. With these devices you can lean out the mixture for more power (to an extent of course...too lean = kaboom) But when leaned out a bit, you will see increased gas mileage.

thanks for the info but i dont have larger injectors, i upgraded the FPR from the stock 3 bar to a 4 bar to compensate for the increase in boost and from the a/f's that I got when I got dynoed I am running very rich as if my a/f's were stock.

[midgetracing28]

Originally Posted by Igovert500

Not sure how you are getting a link between gas mileage and a muffler, so I'll just skip that one. As far as the lowend torque, it's not so much the muffler, it's the restriction which causes some backpressure. Generally the muffler isn't considered as much as the diameter of the piping, but regardless, this doesn't apply to turbo cars, only NA, as mentioned previously a couple of times.

From personal experience Ive ripped a few mufflers off while playing out in the woods. On a na 4 banger you lose enough tourque that your almost always on the gas just to keep up the the speed limit therefore your really wasting alot of gas. It didnt have much affect on my v8 though just pissed off the hole town because it was at 3am and Im cruising home with an stick shift 302 thats basically got open headers on it.

[slideways...]

well i take all that back.
turns out that exhaust is discontinued and only 4 exist in the u.s.
so yeah, just get SS.
thats too bad, i had one on order but didnt have enough money for both that exhaust and my turbo/manifold. i chose the manifold. fuck.

[Gotian]

one more question, if I ran without any exhaust what would happen? Besides my ears bleeding, would I cause flames to come from the turbo? Would I have too much boost creep? Anyone have any experience with this just for fun?

[turtlecrxsi]

When I first got my 944 n/a the exhaust fell off from the cat back. The header was stainless from the factory so it was solid. I didn't see flames but it did sound like a jet engine and probably woke up everybody in that part of the county coming home at 1am... haha...

Lots of people run open downpipes on their turbo cars if they just don't want an exhaust or have a race only vehicle. All you need to do is remove the exhaust and put some custom bent pipe however long you want with a flange on the end bolted to your turbo. I've personally haven't heard of anyone just running the turbo and it doesn't seem like too good of an idea either...

[Gotian]

reason why i was asking is cause someone mentioned being able to run off the turbo. Thanks for the info. If anyone has any info about running on just the turbo let me know, it would be very interesting to find out.

[Chiquae07]

i know my friend runs a downpipe and thats it on his 1g dsm. other than it being loud as hell under throttle, it works fine.

[Igovert500]

Open downpipe is loud as hell...and I have shot flames with it. Open turbo...way too loud for the street. Your ears will bleed and every cop in 30 miles will be pulling you over. Could you...yes. Would you...no.

[Gotian]

Originally Posted by Igovert500

Open downpipe is loud as hell...and I have shot flames with it. Open turbo...way too loud for the street. Your ears will bleed and every cop in 30 miles will be pulling you over. Could you...yes. Would you...no.

thats what i wanted to know, thanks