Free flow muffler = fuel mixture errors?

[RH77]

Originally Posted by Frank Lee

The point was there is lots of latitude for what will work to make a functional exhaust system.

C'mon man, let's keep it civil. The above snipped quote could have made the point without disrespect.

RH77

[brucepick]

Nodes don't scare me.
I dunno about some other dude, but they don't scare me.

[diesel_john]

rain caps might work with spring added, tractor supply , farm and fleet etc. it's already built, just choose you size.

[presidential]

Originally Posted by Daox

Modifying the exhaust will alter your powerband. However, this is much more drastic on a turbocharged engine. On a naturally aspirated engine the effect is much less and the ECU should be able to compensate for it.

With a 4 cyl. powerplant, exhaust modification is much more noticeable in the lower range of the power band than with a v8. However, it also depends on how many liters you're packing, especially on a naturally aspirated motor.

My 2.4L 4 cyl 240sx responded quite nicely to 3" exhaust, netting me a nice MPG gain along with my free flowing air intake system. However, my built 1988 CRX HF with a "mini-me" 1.5L (with a 16v head) lost power, torque and mileage after even a 2.5" exhaust upgrade (115 FWHP before to 101 FWHP after).

If one truly treats an engine like it is an air pump and balances the volume of air in to the volume of air out with proper tuning, I see no reason why one cannot have both performance and economy here. Personally, I've had a 272 rwhp/278 rwtq 2.0L turbocharged motor in a 2700lb car pull down over 35 mpg due to the fact that it it was tuned correctly. The air to fuel on any car is key, not just putting a washer in the 1" tailpipe to fool the computer into thinking that it's running rich/lean. Attack the programming, optimize it, help the engine out by making it operate as the air pump it was really meant to be.

God knows, you can actually go fast while being thrifty...at least one could start out with something aerodynamic.

[roflwaffle]

Originally Posted by diesel_john

the diesel rabbit will break modified exhaust systems in short order when its 1.6L wait till its a 0.8L.

Sounds like a busted mount.

[roflwaffle]

Ball on the manifold? I was dicking around with idle before my IP starting pissing everyplace and it was pretty bad when cold or there was a lot of load from the alternator. I think the best idea is a hand throttle so I could pull on the throttle cable and set it just a wee bit higher if it when cold/etc. I've been meaning to put a kill switch in for the IP solenoid, and a 5speed, and a refreshed engine, and etc...

[brucepick]

IP Solenoid = injection pump solenoid; it's a diesel thing.
Had to google it to find it.

[fanamingo]

Originally Posted by presidential

If one truly treats an engine like it is an air pump and balances the volume of air in to the volume of air out with proper tuning, I see no reason why one cannot have both performance and economy here.

Originally Posted by presidential

The air to fuel on any car is key, not just putting a washer in the 1" tailpipe to fool the computer into thinking that it's running rich/lean. Attack the programming, optimize it, help the engine out by making it operate as the air pump it was really meant to be.

Some of us are pretty new to modding in general. Do you have some good tuning resources you could link to for us? My limited searching has turned up a lot of results that haven't been very helpful.

[metroschultz]

Originally Posted by diesel_john

.the diesel rabbit will break modified exhaust systems in short order when its 1.6L wait till its a 0.8L.
I'll need a magnet on the back bumper to catch the pieces..

Have you tried to install a flex pipe between the engine and rest of exhaust?

http://www.jcwhitney.com/autoparts/P...?Ntt=flex+pipe

I know VW has the exhaust come out the back and down the firewall then to a ball coupler then to the rest of the system. maybe if you added a flex in the system just after the ball socket? Hmm? Maybe?
Just a thought.
I hate feeling exhaust vibration and have added these to many vehicles.

S.

[Chris D.]

You can get stainless flex pipes for far cheaper on ebay..