TheSamba.com :: View topic - Looking at exhausts and looking for opinions

Tue Apr 17, 2012 5:48 pm

I'm looking at several exhaust options and I'm curiuos to what you fine folks run on your Ghias.

I want to retain the stock heat exchangers as they're in good shape and I'd like to have some heat. I'm retaining the stock 34PICT-3 and have a functional manifold w/heat risers so I want to utilize them also.

I was all dead set on going w/an OEM style muffler w/the preheaters but ran into questions re. clearance w/a filter pump, so I'm exploring more options.

I found an excellent read on adding headers w/a single quietpack muffler along w/swapping the carb main jet from 127 to 130 on an otherwise stock 1600ccDP. This setup experienced nearly a 7hp gain @ 4500rpm (4hp @ 3500rpm) & approx 4ft lbs of torque throughout the rpm range over the stock setup. They claimed the engine ran alittle cooler also.
Oddly, the dual quietpack setup came in alittle lower than the single. They say backpressure was probably better on the single.

Another plus for me is that a filter pump is compatable w/the setup.

The question I have is the plumbing of the fresh air from the fan shroud to the heat exchangers. The headers don't come w/those preheat chambers and i've been told by several sources that they are just for transition of the plumbing around the exhaust pipe.
So, is anyone running this setup w/flextube manuvered around the head pipe?
Does this setup sound good?
Is it very loud?
Does this setup last?
Dave

Tue Apr 17, 2012 7:28 pm

If you want to run headers, have heat and maintain a stock look in the engine compartment, you can try routing the air hoses like this:
Get a pair of the short metal tubes that allow the air hoses from the shroud to connect with the muffler's pre-heat boxes. Next, weld on a couple of small metal tabs to each tube and drill a .156 dia hole in each. Use some #6 machine screws and nuts to attach the tubes to the rear engine tin. Run the original black paper/foil air hose from the shroud to the tubes sticking up thru the tin. Use the stock rubber seal where the hose meets the tin. Underneath, use the silver foil-type hose to connect the lower end of the tubes to the exhaust's heat exchangers. Just route it around the header pipes as best you can.

Wed Apr 18, 2012 1:02 am

Check out this thread:
http://www.thesamba.com/vw/forum/viewtopic.php?t=459230&highlight=stock+exhaust

Wed Apr 18, 2012 10:36 am

A good 1 3/8" extractor with a single quiet pack should do the trick. I've run one on a stock 1600 DP with no issues and it's IMO quieter than stock. The QP/extractor combo changes the exhaust tone from a higher pitched tweet/warble to a lower pitched rumble, but the overall perceived noise level goes down due to the fact that lower pitched noises are less shrill to the human ear. Just run longer heater hoses directly from your heater boxes to the "fresh air" outlets in your fan shroud.