Turbo VS NA Intake manifold
11-05-2012, 07:24 AM
#16
Addict
Rennlist Member
Rennlist
Small Business Partner
Rennlist Member
Rennlist
Small Business Partner
I suppose the error will decrease as boost increases.
The factory presumably did not really care about the higher imbalance since a NA manifold is not supposed to see a MAP higher than 100 kPa anyway, and as you say a stock head will most certainly always flow less than its corresponding stock intake manifold.
The factory presumably did not really care about the higher imbalance since a NA manifold is not supposed to see a MAP higher than 100 kPa anyway, and as you say a stock head will most certainly always flow less than its corresponding stock intake manifold.
11-05-2012, 07:43 AM
#17
Instructor
Thread Starter
Join Date: Jan 2011
Posts: 125
Likes: 0
Received 0 Likes
on
0 Posts
Well this car is kind of a work in progress, and it has been 2 years since I drove it last. Really itching to get it back on the road. I do not have a tig welder yet so welding aluminum is not an option yet. The head has a minimal port and polish job from a local shop. I wonder if polishing the NA manifold would help it out at all?
11-05-2012, 09:26 AM
#18
I could be wrong, but if the error decreases as boost (pressure) increases, then I see this error increasing as vacuum increases?
I don't think cyl #1 running slightly richer than the others should be problematic as VE will be moderate/low when the TB is hardly open.
Both manifolds were tested @ 28".
I don't think cyl #1 running slightly richer than the others should be problematic as VE will be moderate/low when the TB is hardly open.
Both manifolds were tested @ 28".
11-05-2012, 01:03 PM
#19
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
A couple of thoughts –
Did you test the manifold by itself or attached to a head? That will make a big difference.
More importantly – manifolds are tuned to work in a resonant manner, steady state flow does not act the same way as a resonant system. So you are not getting the full story with flow bench numbers on a manifold….unless you have a spintron attached to your flow bench!
Did you test the manifold by itself or attached to a head? That will make a big difference.
More importantly – manifolds are tuned to work in a resonant manner, steady state flow does not act the same way as a resonant system. So you are not getting the full story with flow bench numbers on a manifold….unless you have a spintron attached to your flow bench!
