Quote:
Originally Posted by ohcbird
"Hits a wall at 10psi"
Since you've eliminated all the other variables, I'd check the exhaust pressure going into your hot sides. If you're seeing over 20 PSI there (2:1), then you've found a restriction. The closer to a 1:1 ratio, the better. As a side note- do you have any EGT probes? I'm curious as to what your gas temps are hitting. Do you notice a more-than-normal rise in IAT when you're on the boost for a while?
I agree that your .81 housings are about right & should work fine, but you might be right at their limits already. I think that motor is trying to move alot more air than it currently can, hence the 'wall' effect. I think you can get 1.01 housings for those; that might be worth a try.
|
my thought exactly.. but check the boost before at the turbines just to be sure....
you could have another issue causing it.. some manual boost controllers need to be plumbed to both sides of the diagphram on the wastegates.. so they hold them closed by applying pressure on top to hold the valve closed till the boost hits preset, and then they release this pressure to allow the valve to open.... just make sure you havent got the hoses crossed (mounted wrong) on one or both sides so your boost controller is actually opening the valve instead of keeping it closed