Boost sag? No, you don't need EBC.
#41
Isnt a side effect of this location a possible boost spike/overboost? By the time location B sees 12 psi, there may be 16psi at point A on its way allready. (making up numbers here)... That was my rationalization for going with the compressor outlet location... I wanted to play it safe on the street so I opted for a slight performance loss in favor of more safety and simplicity.
I agree location B is probably best, just thought I'd mention this^
I agree location B is probably best, just thought I'd mention this^
#42
It makes all the sense in the world and excellent write up...!!
However boost spikes are really a possibility... Also the size of the IC is critical... it would be like the size of the straw, get a 2" hose and blow as hard as you can, and you will not feel resistance... Unless you are really good at blowing hahahahaha
I recently installed mine at the turbo nipple, and have seen steady boost, but I admit not going all the way to redline yet... Will do a run, as soon as I can, and will share!
miatex
However boost spikes are really a possibility... Also the size of the IC is critical... it would be like the size of the straw, get a 2" hose and blow as hard as you can, and you will not feel resistance... Unless you are really good at blowing hahahahaha
I recently installed mine at the turbo nipple, and have seen steady boost, but I admit not going all the way to redline yet... Will do a run, as soon as I can, and will share!
miatex
#43
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,197
Total Cats: 1,136
The reason the straw was use is because we have to downsize our example since our mouths, even though we're all Miata driving gays, are not as powerful as even the smallest of turbos.
My only issue with this idea is that I use the amount of boost drop off as an indicator as to how much my bolts have stretched, and therefore how much exhaust is leaking out between my turbo/manifold. The flanges need to be resurfaced, so it always sounds like there's a bit of a leak.
My only issue with this idea is that I use the amount of boost drop off as an indicator as to how much my bolts have stretched, and therefore how much exhaust is leaking out between my turbo/manifold. The flanges need to be resurfaced, so it always sounds like there's a bit of a leak.
#44
I will see how my setup resist the current 13psi target... thanks for the clarification tho.
miatex
#53
Def an excellent post by Joe, as usual, but I feel like it should also address boost/power loss do to inadequate spring pressure on the Internal/External wastegate. From my exp and reading its generally not recommended to run boost pressures more than 1.5x your WG spring, regardless of boost control method. It will not cause your boost to drop off as much as it will cause you to spool much slower than you could if you have a more adequate spring for the boost you are running.
Further, I would say that 1.5x might even be too much when running an IWG with a small/crappy internal diaphragm. Say you are running 15psi. I would put my money down that you would see an increase in spool running a 15psi IWG vs a 10psi IWG. EWG can get away with more because they have much larger diaphragms and often run dual springs.
Further, I would say that 1.5x might even be too much when running an IWG with a small/crappy internal diaphragm. Say you are running 15psi. I would put my money down that you would see an increase in spool running a 15psi IWG vs a 10psi IWG. EWG can get away with more because they have much larger diaphragms and often run dual springs.
#60
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,656
Total Cats: 3,011
Yes it would be rock steady, but what is your turbo doing at engine loaded part-throttle cruise (uphill at 70mph on the highway)? To make 12psi in the manifold behind a partially closed throttle plate you might be making 30+psi at the compressor and huge amounts of excess heat for your intercooler to fight with. Plus you are restricting the airflow by forcing the turbine to fight the excess pressure that the compressor is seeing. I bet the turbine gets pretty hot at a cruise compared to one referenced at "point B". You should try switching it for a tankful and see if your mileage improves.