I am not sure if this is the right topic area for this, but here goes.

Over at TTOA (Tempo Topaz of America), I am trying to find a site that has members that know how to expertly tune the exhaust system for the Ford Tempo/Mercury Topaz.

Now that you're all done laughing....


Here is an excerpt from www.tempotopaz.com tech center about the exhaust system.

"Exhaust gases from combustion leave the head, travel through the exhaust manifold which is identical for all HSC models. The gases then flow through a mandrel bent 2.5" collector pipe. They are then squeezed through a short 2" section before the catalytic converter then travel down a crush bent 2" pipe and out a restrictive factory muffler with a single tip.

The HSC's exhaust manifold is quite restrictive. The two center runners are equal length, and the two outter runners are equal length to each other. It bolts to the collector pipe. "

The goal is to achieve performance with economy, hence the desired exhaust tuning. We prefer for it to be midrange, where most street driving RPM range is.

What has been thrown around is using a 2.5" downpipe with 1 1/2" primaries mandrel bend, and using a high flow cat placed as far back as possible for maximum power, and a Chamber 1 Magna Flow coming out the back. I don't know the part number. Sorry.


Who has suggestions for a PWE move as you guys know this better than I do. I'm aiming for a zero loss as possible exhaust system that scavenges the cylinders and squeezes every amount of power efficiency out of that tiny 2.3L HSC motor.  

well, on a 4-stroke engine the easiest way to improve power with the exhaust is to reduce or eliminate back-pressure while increasing velocity, it really doesn't matter what vehicle we're dealing with, they all respond to exhaust improvements.
the downside is when you make improvements to the exhaust side the air/fuel mixture requires adjustment to compensate for the improved scavenging which tends to lean out the mixtur.
there is no free ride.
knowing that the factory calibration has the motor leaned out already, further leaning of the mixture will most likely promote pinging.  

Well I know that exhaust tuning is one of the most effective ways to boost and use power more efficiently. A 180*F thermostat is being installed, so that takes care of any lean problems that might be encountered.

I'm just trying to find the most efficient design. Specific figures, I suppose. I don't have any computer simulation software, nor do I know how to work it lol  

ok, water temp has nothing to do with air/fuel mixture on a non-computer controlled engine..
sorry, i don't have specific figures or measurements..
i also feel that reading too far into this mod, overecomplicating things perhaps..
common sense mods to the exhaust will serve you well..