This is a discussion on Fuel pump, injectors, TGV deletes and TD04 19T within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by metaldahlberg I assume that would come from tuning the valve timing. nono, I'm talking, you have a ...
As the piston travels downwards it creates a vacuum (hence the VAC at idle). It sucks in as much air as it can. The turbo helps to push more air into the engine. The resistance between the turbo and the ignition chamber, and the CFM of the turbo at that given PSI both determine how much air is injected into the cylinder. There is no "static pressure". The engine is always sucking, and the turbo blowing.
(if you're a visual person... here's a link to the Otto cycle) Animated Engines, Four Stroke
One thing I think you're also forgetting... the PSI in the intake tract is measured at the turbo outlet... not in the heads. Resistance, flow, and heat will always change that number by the time you get past the valves. A more efficient turbo will always have less resistance more flow and less heat when it's in it's "sweet spot"... like Donkey is talking about with his 16g-xt vs a TD04.
Buy the XT. If you don't... You'll be driving it for years thinking, "Ugh, I should have just spent the $255 years ago and enjoyed it since."
It's not a perfect thought train, but has it's merits
I just spoke with Blouch in great detail about the three contenders for my turbo swap. The winner is ...
The 19T upgrade. Unless I radically change the way I drive the WRX it really is the best choice. I have had the WRX for over 7 years now and know what I want out of it.
Both 16Gs will have way more top end that I will really ever use or need. I'm told the non-XT 16G starts to spool up at 3500 to 3900 rpm. I know I will not be happy with that. The XT will be even worse. Yes, I know I will have the fuel capacity for a lot more turbo. I'd also like to keep my stock internals intact for a while.
I was told the maximum flow rate is 480 cfm for the 19T and the 16G would be 510 - 515. Those figures are right from the builder of both turbos.
There is this discussion as well that seems to indicate great things about the 19T: TD04 19T Upgrade Discussion - NASIOC
Last edited by Sasquatch; 07-05-2011 at 12:47 PM.
Haven't read much about the 19T. I'm sure it'll be a nice boost compared to the stock one though =). Let us know your impressions of it.
Last edited by Donkey; 07-05-2011 at 02:43 PM.
I've seen decent things about the 19T - it's a good medium on the MHI side...
...but why the hell aren't you getting an IHI turbo???
How many miles are you at on the WRX, Bill?
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2011 Ford F-150 ECOBOOST 4x4