Re: Opinions - 4-2 manifold

[Dan Bubb <jdbubb@ix.netcom.com>]

The stock JH toilet bowl manifold is the most restrictive manifold that
VW put on any watercooled engine. Changing out the cam or TB without
replacing this manifold will result in NO power gain. I installed a "G"
grind with a stock exhaust and measured no gain using a g-analyst.
Installing the earlier dual outlet manifold is the number one item to
upgrade on the JH. Installing the TT dual downpipe is a big improvement
over the VW dual downpipe. Again, I measured this with a g-analyst not
just the old butt dyno.
According to the old TT Amazing dyno stories a JH with VW dual outlet
manifold, TT dual downpipe and 2" exhaust with G cam netted 115HP!
Installing a larger throttle body is pretty much a waste of time until
you have a seriously goosed engine. Installing a larger throttle body
will make the engine feel faster (a little more go for the same throttle
opening) but the actual improvement is 1-2 hp.

Aaron Ness wrote:
> 
> I was at the parts shop last night asking the owner if he knew where to find
> a 4-2 manifold for my JH locally.  He didn't know, but he suggested that I
> wouldn't get much benefit over stock.  I'm sure I would get more out of a
> larger aftermarket manifold/downpipe, like something from TT, but I don't
> have the money to spend on it, and I won't be replacing the rest of the
> exhaust system either.  I don't expect a huge gain; I just want something
> that gives me more potential for if I wanted to go with a larger TB (with
> intake ground out to match) or different cam or something.
> 
> So...is it a waste of time to try and source a stock dual outlet manifold
> and downpipe, or should I hit the junkyards?  Who is running this on a JH
> (or is everyone running TT or something)?
> 
> Thanks in advance...
> 
> Aaron
> '87 528e
> '82 Scirocco
> '70 Beetle
> '82 Kawasaki GPz550
> 
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