Harm of a restrictive intake
03-03-15, 10:11 AM
#1
Harm of a restrictive intake
So I had some old 20 year old apexi intakes the filters were ancient and because of my intercooler they honestly didnt FIT .
So I decided to make my own intakes . made a heat shield , put a couple of 2.5 inch filters and got a bit of ducting for it .
And yeah intake temps even dropped a couple C on the Power FC . BUT using the same settings the car boosts 1psi less then it did before . and it seems maybe to my imagination that it also takes a bit longer to spool
So I'm curious .. What the consensus is . on a more restrictive intake
it did help a bit with boost creep which I had haha .
But since the intake is restrictive I imagine its putting more stress on the compressor wheel ...
is the more restrictive intake a good solution for the boost creep , or should I change my intake setup to something better flowing . and just deal with my boost creep ( boost creep is not dangerous it creeps up to 14 psi from my preset 12 by redline , BUt I have plenty of fuel for it )
So I decided to make my own intakes . made a heat shield , put a couple of 2.5 inch filters and got a bit of ducting for it .
And yeah intake temps even dropped a couple C on the Power FC . BUT using the same settings the car boosts 1psi less then it did before . and it seems maybe to my imagination that it also takes a bit longer to spool
So I'm curious .. What the consensus is . on a more restrictive intake
it did help a bit with boost creep which I had haha .
But since the intake is restrictive I imagine its putting more stress on the compressor wheel ...
is the more restrictive intake a good solution for the boost creep , or should I change my intake setup to something better flowing . and just deal with my boost creep ( boost creep is not dangerous it creeps up to 14 psi from my preset 12 by redline , BUt I have plenty of fuel for it )
03-03-15, 10:21 AM
#2
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a little intake restriction is probably better than boost creep...
the turbo is working a little harder, if you plotted where you were on a compressor map, the intake restriction adds to the pressure ratio, so the turbo is going to run a higher pressure ratio, all things equal, which they aren't, as boost dropped too...
the turbo is working a little harder, if you plotted where you were on a compressor map, the intake restriction adds to the pressure ratio, so the turbo is going to run a higher pressure ratio, all things equal, which they aren't, as boost dropped too...
03-05-15, 10:46 AM
#3
a little intake restriction is probably better than boost creep...
the turbo is working a little harder, if you plotted where you were on a compressor map, the intake restriction adds to the pressure ratio, so the turbo is going to run a higher pressure ratio, all things equal, which they aren't, as boost dropped too...
the turbo is working a little harder, if you plotted where you were on a compressor map, the intake restriction adds to the pressure ratio, so the turbo is going to run a higher pressure ratio, all things equal, which they aren't, as boost dropped too...
+1 on a little restriction being better than boost creep.
Don't over think it. It won't have an impact on reliability. I would often re-install the stock airbox on my turbo rotaries in the winter when I lived in cold weather so that boost could be controlled. Otherwise it would spike and creep like a ****.
03-05-15, 11:07 AM
#4
a little intake restriction is probably better than boost creep...
The turbo is working a little harder, if you plotted where you were on a compressor map, the intake restriction adds to the pressure ratio, so the turbo is going to run a higher pressure ratio, all things equal, which they aren't, as boost dropped too...
The turbo is working a little harder, if you plotted where you were on a compressor map, the intake restriction adds to the pressure ratio, so the turbo is going to run a higher pressure ratio, all things equal, which they aren't, as boost dropped too...
03-05-15, 07:35 PM
#6
10psi on primary turbo... 4500rpm secondary turbo kicks in, 8psi.... then back to 10psi. Then 8psi to redline.
If the literature is correct and it is 8psi until redline (after secondary turbo is online) then 14psi at redline represents around a 6psi overboost situation?
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