Re: True Hp Gain?

[Joel Leclerc <deejay@info.polymtl.ca>]

I agree with one thing, is to balance the airflow
from input and output, only one of them won't give
the optimal hp gain.

/Joel

On Sun, 31 Jan 1999, Mark Shaw wrote:

> Care should be taken not to "add up" all the
> horsepower gains claimed by a given upgrade.
> 
> All of your mods are to increase airflow through
> the engine.  In the end the net effect will be limited
> by the engine porting, valves, and cam timing.
> 
> I have added a K&N filter, tri-Y header, enlarged
> throttle body (you can do this with the stock one),
> Autotech sport 2-inch exhaust with high flow muffler
> and I guess the overall effect is less than 15-20%
> on my 1.6L engine (maybe 90-95 instead of 78 hp).
> But the low-end torque was greatly improved.
> 
> Also, if you are running a K-Jetronic system you
> need the larger 80 mm air-flow meter to take advantage
> of the larger throttle body and K&N filter.
> 
> Mark
> 
> 
> 
> Joel Leclerc wrote:
> 
> > By experience on my gti86...
> >
> > K&N filter will give around 5 HP more
> > Headers "4to1" will give 5 to 7 HP more
> > Headers "Tri Y" will give 7 to 12 HP more.
> > High flow muffler around 5 HP more..
> >
> > that is want I can tell from my gti86
> > modification I have done before..
> > Over all I had Straight pipe and no cat
> > and this gives about 25HP more, including
> > K&N, headers 4to1 and a ANSA highFlow.
> >
> > Probably with 2" exhaust and audi 5000TB
> > you'll get 5 to 10 HP more, but this is a guess here!
> >
> > On Sat, 30 Jan 1999, Paul Maione wrote:
> >
> > > Okay, this is the breakdown on the situation. I want
> > > to do the following to my exhaust system...
> > >
> > > A1 Euro GTI 4 into 2 exhaust manifold
> > > TT dual Downpipe (no cat)
> > > 2" Straight Pipe
> > > High flow Muffler
> > > K&N Air Filter
> > > Audi 5000 TB
> > >
> > > What will be the total HP gain from this?
> 
> 


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