Exhaust Manifold backpressure question
#1
Senior Member
Thread Starter
iTrader: (2)
Join Date: Nov 2007
Location: Saint Paul, MN
Posts: 1,489
Total Cats: 28
Exhaust Manifold backpressure question
So I was playing with the BW turbo configurator and it estimates 9psi backpressure at the turbine (with boost set to 21psi), what would be considered excessive? Obviously 0 would be best but seeing as the TS housing on the 6258 and 6758 wont be happening, this is the best that can be done. With a goal of 400-450 (leaving some play in case I can't keep up at 400), the 6758 is the ideal setup for my goal if this isn't too bad..
Here's a link to the config.
Edit- It also states that the wastegate is 'flow choked', I assume it's because it's of insufficient diameter, thus needing an EWG?
Here's a link to the config.
Edit- It also states that the wastegate is 'flow choked', I assume it's because it's of insufficient diameter, thus needing an EWG?
#4
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
Anyone I've ever spoken to says there's 1.5-2x more pressure on the turbine side than the compressor side because it takes equal or more energy to turn the compressor. I'm not an engineer, but I'm quite eager to read more on this.
#9
Former Vendor
iTrader: (9)
Join Date: Jan 2008
Location: Bay Area, California
Posts: 929
Total Cats: 9
Quickly looking back at some data I've collected in the past on this stuff, exhaust gas pressure varied from 1.75 to .70 of intake pressure. Lower load and low engine speed generally translated to higher exhaust/intake pressure ratio.
Thread
Thread Starter
Forum
Replies
Last Post