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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

i'm going for a K27 hybrid because i have the parts. And that gt28rs is not that hot....it maxes out at 350HP while a strong K27 starts at 300

so at least in terms of peak hp numbers the K27 is not that bad

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flosho · Posted: Sat Dec 11, 2010 4:13 am Post subject:

The k27 doesn't sound like a bad deal, but I guess if I'm going through the effort to build a manifold, why not get something a little more universal.

The 28rs is supposed to be one of the best turbos on the market for ~2.0 Liter engines. Ball bearing housing ensures quick spool time and it still flows enough to get 300hp out of it.

I also considered going up a step to the gt30.

What about something like a 16g or '50 trim' that SRT4 guys run? They all have over 225whp...
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flosho · Posted: Sat Dec 11, 2010 8:01 am Post subject:

Any thoughts on this unit guys:

http://himni-racing.com/index.php?main_page=product_info&cPath=25_29&products_id=341
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Joes924Racer · Posted: Tue Dec 28, 2010 4:00 am Post subject:

Absolutly freaking awesome choice there from the descrip.
Cheers.
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Cedric · Joined: 27 Aug 2004 Posts: 2810 Location: Sweden

isnt that an old design by now, maybe a wise choice to get something newer, at least performance wise..
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skittleoncrack · Joined: 01 Jan 2011 Posts: 15 Location: Central Arkansas

skittleoncrack · Joined: 01 Jan 2011 Posts: 15 Location: Central Arkansas

flosho · Posted: Mon Jan 03, 2011 2:35 pm Post subject:

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

what is the diameter of the intake of the compressor side?
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skittleoncrack · Joined: 01 Jan 2011 Posts: 15 Location: Central Arkansas

@flosho

it might be possible to bypass but would require more work than its worth. every manual boost controler I have seen is spliced into the vacuum line between the WGA and the solenoid. Its just a valve that you adjust open or closed. Its a cheap way to build more boost but it is extremely dangerous because it is not compensating with added fuel, which developes much leaner AFRs. I am adjusting my boost levels using a DiabloSport Trinity. This allows for targeg boost adjustments, spark, fuel, and timing (all adjusted individually by 1000 rpm increments) also can adjust idle rpm max rpm cooling fan adjustments and AC compressor adjustments. It has built in datalogging with USB out to computer for datalogging of over 200 avalible parameters. I installed a wideband AEM UEGO before i started tuning anything though! Now im holding 21psi at 11.4-11.7AFRs on stock turbo.

MBC FTL! I have seen so many people tear their cars up because they were just trying to get as much boost as possible.
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1980 924 Turbo
1980 924 Turbo - Parts Car
1995 Mitsubishi 3000GT
2005 Dodge SRT4 - 21psi, Diablo Tuned
2007 Mitsubishi Eclipse GS (Daily Driver)
2009 Kawasaki Ninja ZX-6R

flosho · Posted: Tue Jan 04, 2011 12:40 am Post subject:

I'm in a bit of a rush, but I don't see why a MBC would be dangerous unless the oem boost solenoid is controlling the amount of fuel being supplied and that seems like a terrible idea all together.

The cars use MAF or MAP to calculate the amount of air entering the engine and the ECU would supply the proper amount of fuel based on that. So increasing boost via MBC should be fine as long as you don't outrun your fuel supply.

Pretty much everyone here that ups the boost uses a MBC, granted these are not electronically controlled for fuel or boost to begin with.

My roommates 04 srt4 had a MBC and was running 18-20 lbs, and never hurt a thing. He had a UEGO installed as well and if anything with the increased boost it was dumping too much fuel (10.5:1) and he had to lean it out.

I'd have to ask my friend exactly what he did in terms of how exactly he routed the mbc tho.
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stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

The best manual boost controller configuration in my opinion is one that applies counter pressure to the top of the waste gate diaphragm. In this way, if the MBC hose disconnects or splits, the waste gate defaults back to normal operation. If one were to put the MBC in line with the actuator line, if the MBC plumbing or MBC itself failed and decided to not pass pressure for some reason, you would get unlimited boost - the waste gate would not actuate. Then you have Porsche 931, special Chernobyl edition.
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skittleoncrack · Joined: 01 Jan 2011 Posts: 15 Location: Central Arkansas

my battery is dying on my phone so i have to be quick.

The problem with MBC is that you have people that have no clue to what they are doing and try to crank their boost way up and yes the map and O2 will compensate some but more so the PCM will be trying to open the wastegate. (and should throw rhe following trouble code)

SRT4s stock turbo, like many other stock turbos, have far more potential than they are tubed for. I have personally seen my own boost guage read somewhere around 27 after my programmer had a brain fart. The weakest part of a stock turbo vehicle is typically the fuel delivery. SRTs, especially 03 04s, cannot provide enough fuel. (the 05 has a stage one injector but even that cannot keep up with the stock turbo at max)

Since your roomate was running a wideband and was adjusting his fuel it sounds like he isnt one of these people. though i wonder why he didnt just get a handheld programmer that adjusted boost..
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1980 924 Turbo
1980 924 Turbo - Parts Car
1995 Mitsubishi 3000GT
2005 Dodge SRT4 - 21psi, Diablo Tuned
2007 Mitsubishi Eclipse GS (Daily Driver)
2009 Kawasaki Ninja ZX-6R

skittleoncrack · Joined: 01 Jan 2011 Posts: 15 Location: Central Arkansas

heres some light reading for u.

http://en.m.wikipedia.org/wiki/Boost_controller?wasRedirected=true

@stevekat -if u read this under "principles of operation" note that SRT4s, my example, and numerous other modern externally wastegated turbos use the swing type or single port WGA. I believe you are thinking of the dual port type.
_________________
1980 924 Turbo
1980 924 Turbo - Parts Car
1995 Mitsubishi 3000GT
2005 Dodge SRT4 - 21psi, Diablo Tuned
2007 Mitsubishi Eclipse GS (Daily Driver)
2009 Kawasaki Ninja ZX-6R

flosho · Posted: Tue Feb 15, 2011 5:58 am Post subject:

My choice: gt2860rs
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