Boost on a stock LS *updated/pics/dyno results pg.6/7*

Turbo and Supercharger discussion
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By JUICE
- Wed Feb 17, 2010 4:01 pm #175902 BUMP for these Q's!!

since i'm gonna be runnin a kind of big intercooler, I figure i'm gonna have some boost loss with the WGA getting its vacuum source from the end of the compressor outlet. is too much psi loss gonna cause a problem for tuning??


and if I'm understanding what i'm reading, I can run the WGA hose to a vacuum block by the IM safely with a good BOV in use to fight the comp surge, and get more accurate psi that should match what the boost guage reads....


got inputs?? thumb up



And....

Whats the deal with gap around the "plunger" of the wastegate. seems like it would let quite a bit of exhaust past?? i thought mine may be missing some sort of seal there, but i guess not..


best pic i could find. you can see light around the plunger (the gap) whats up with this??

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By dreamer
- Sun Mar 28, 2010 1:39 am #184130 Always run what you map sensor is seeing, therefore you'd run off your intake manifold.

And your second question makes no sense but I'll answer as best as possible.
Run your BoV off one line off the vac. manifold. Run your wastegate line the vac manifold. Then run your boost gauge off the vac manifold. All just seperate line off the vac manifold.
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By JUICE
- Sun Mar 28, 2010 4:29 am #184162
dreamer wrote:Always run what you map sensor is seeing, therefore you'd run off your intake manifold.

And your second question makes no sense but I'll answer as best as possible.
Run your BoV off one line off the vac. manifold. Run your wastegate line the vac manifold. Then run your boost gauge off the vac manifold. All just seperate line off the vac manifold.




thanks man.

I know how to run the vac lines themselves, I was just mainly wandering about the vac source for the WGA. since i plan on having some pressure loss, i just wanted to make sure i could cap the "nipple" at the end of the compressor and run the line to the IM.

the extra length of the vac line wont cause any problems with the WGA's function right??
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By That One Dude
- Sun Mar 28, 2010 4:33 pm #184204 As far as the extra length of the vacuum line goes, you shouldn't see any problems. It's not really an increase in distance that will cause an appreciable change in the amount of vacuum pressure.
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By BLaCkSiLo
- Mon Mar 29, 2010 1:32 am #184286 i run the bov and boost gauge off the manifold and the wastegate straight off of the compressor fitting on the turbo so that the wastegate gets the best source of boost in order to control it. it also won't see the 1-2psi loss through the FMIC and piping....

it works really well for me
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By JUICE
- Mon Mar 29, 2010 3:11 am #184306
BLaCkSiLo wrote:i run the bov and boost gauge off the manifold and the wastegate straight off of the compressor fitting on the turbo so that the wastegate gets the best source of boost in order to control it. it also won't see the 1-2psi loss through the FMIC and piping....

it works really well for me



thats just it though...

since i'm expecting a loss of psi.... if i have it actuate at say 9lbs and it does so when its seeing that at the IM, i shouldn't have to worry about pressure loss... right? cause it will actually be pushing say 11 or 12psi to make up for it?

I guess if that ends up being more psi than i need, i could run the wga to the comp outlet to let that 9lbs turn into 6 or 7 by the time its to the IM.. guess thats just something we'll have to figure out once it's on the dyno...
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By BLaCkSiLo
- Mon Mar 29, 2010 4:05 am #184320 well you tune off what your MAP sensor reads...for instance, i'm running a 0.9 bar spring in my wastegate (no MBC or EBC) which is about 13.5 psi but my map sensor (and boost gauge and BOV) see only 11.5psi. so everything is tuned around that IM reading.

i just like that wastegate to comp housing because it is more stable, i get no boost spikes and that is the main reason i went with pure wastegate spring pressure with the straight tube to the wastegate from the comp housing.

so either way will work....
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By JUICE
- Sat Aug 21, 2010 7:48 pm #209959 **UPDATE**



Turbo is on!!!!!1111!!!!11!1!!!!!! :woot: :woot: :woot:




just got the turbo itself mounted up, still have to mount up the intercooler and charge pipes but, was able to fire it up and check for leaks and what not. so i'm pretty stoked!


question...

so as i mentioned above, whats the deal with the wastegate having the gap around the plunger?? does it have to have vaccum from the charge pipes or something to keep it closed?? cause how it is right now, it's letting assloads of exhaust blow by at idle and when you rev it...

any input fellas??

Image
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By jdmsol_kid
- Sun Aug 22, 2010 1:43 am #210005 yes your westgate needs a metal ring that goes inside without it your in the crapper. i see you found this out thugh and any chance you find a place to buy them?
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By JUICE
- Wed Oct 06, 2010 12:52 pm #217115 well......... here we go again :lol:







couldn't stand the sight of the cast mani and ugly downpipe, so we're going back with the twin scroll setup (pics pg.2) :woot: :woot: :lol: :lol:



I've been piecing all the little stuff for it and am now ready! I'm hoping this weekend to get the mani, turbo and my new moroso oil pan on so work on the downpipe can start.
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By jayEGR
- Wed Oct 06, 2010 9:04 pm #217189 sweett bro thats an a1 ls right and you got that bitch turbo wow that some shit :thumb: like it bro
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