Anyone have flow bench #'s for a ported 1.8T exhaust manifold? SPP or other?
06-24-2005, 09:23 AM
#1
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Anyone have flow bench #'s for a ported 1.8T exhaust manifold? SPP or other?
Mine is being done now & I was looking for something to compare the results to.
06-24-2005, 10:03 AM
#4
also do a search...
i had my manifold extrude honed in a TT forum organised group buy...i believe the numbers were 15% greater flow. same size ports...not a real "porting"...just smoothing.
06-24-2005, 10:38 AM
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well the stock manifold seems to flow well according to ATP
"In addition, we found that the slight taper designed into the runners of the stock manifold promotes exhaust gas velocity even further. Further testing resulted in a much quicker GT28RS turbo on a 1.8T engine, at least by 300 rpm faster than any other off the shelf GT28RS turbo driven by an aftermarket manifold on the original T25 flanged turbine housing."
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06-24-2005, 11:50 AM
#8
that seems ...questionable.
the stock manifold is so horribly gasket matched it probably cancels out any improvement in air velocity.
if what ATP says is true, you'd still want to gasket match and smooth the manifold some.
if what ATP says is true, you'd still want to gasket match and smooth the manifold some.
06-24-2005, 01:29 PM
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it is always good to question...I'm curious to see 1/4 times and dynos
of the first few people here to get the ATP stuff and keep the manifold stock.
Then again, you never know what ATP does but if you follow their directions, they never remove the stock manifold for install.
Then again, you never know what ATP does but if you follow their directions, they never remove the stock manifold for install.
06-24-2005, 04:17 PM
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obviously nowhere near what a "complete" GT28RS kit will get you
I personally don't see the point in paying $1300 for a turbo that will flow efficiently up to 400ish HP and only get 280 out of it. I'll gladly pony up the extra $$ for a fully working kit that'll get me 350hp on a solid pump tune and up to 400 on a race tune knowing everything works well together.