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lbz34 · 01-24-2002, 09:05 PM

Who has run the vacuum line for the wastegate off of the compressor housing?? is there a difference as opposed to running it off the intake manifold?(after the TB, or before the TB?)
Just curious.

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D-SPEED · 01-24-2002, 09:17 PM

the instructions for my tial WG say to run it from the intake mani before the TB...im just gonna weld a hose barb onto the charge pipe right before the TB. I have a friend who runs every singe vacuum/boost line for his whole setup from one source of the manifold, and his car works fine. Others run off the compressor housing too. To me, it seems most ideal to run off the manifold pre TB.

lbz34 · 01-24-2002, 09:24 PM

Thats how my turbo crx was setup. I didnt ever try it the other way(post TB). Now that i think about it more it would make sense to run it after the TB. reason being the wastegate may see pressure a little later in spool time due to the distance fromt the turbo. Dont really know if this is practical, or if it would help spooling times. also when the throttle is closed, would'nt the wastegate close from the vacuum in the line piped after the TB?

maxim · 01-25-2002, 04:46 AM

You wll loose about 1-2lbs of boost using the port on the compressor, because of the intercooler. There are three other places you can T it into: brake booster line, FPR line, or cruise control line.

Lsos · 01-25-2002, 07:23 AM

I've heard knowledgeable people recommend running it off the compressor due to less chance of spiking. Sure you will lose pressure through the intecooler and such, but you can always make up for that by cranking up the wastegate.

HXMan · 01-25-2002, 07:29 AM

Everyone Really needs to get Maximum Boost by Corky Bell! It explains all this stuff.

RGAZ · 01-25-2002, 07:32 AM

I would never run it from the intake after the TB. The boost spikes would be huge when you got off the throttle and the wastegate will respond weirdly when you are at part throttle and cruising. The wastegate should be watching the output of the compressor with nothing interfereing with it. Picture what would happen to the turbo rpm if you had the wastegate line at the TB and the connection at the intercooler popped off. The wastegate would not open and the turbo would spool as fast as it could. Not a good scenario.

I use right off the compressor so the feedback loop is as small as possible. Quick response is what you need from a wastegate so the closer to the turbo the better.

As for the intercooler, just adjust the wastegate for the extra drop in pressure.

Randy

lbz34 · 01-26-2002, 08:58 PM

you guys have some good feedback. was just a theoretical question. thanks for the intellectual input

Xerxes · 01-27-2002, 12:05 PM

so likewise, if you have a boost controller, you should tap that in right after the compressor too, right?

-Xerxes

maxim · 01-27-2002, 04:28 PM

Quote:

I've heard knowledgeable people recommend running it off the compressor due to less chance of spiking. Sure you will lose pressure through the intecooler and such, but you can always make up for that by cranking up the wastegate.

Well, if he had mentioned having a boost controller it would be a totally different question wouldn't it? I have a vac line from my Tial t'd into my fpr line and it works better without boost spiking. Of course, if the qualty of the wastegate s substandard and you have your BOV adjusted to its hardest setting you are sure to see boost spike. As said before if you want more boost, you need to tap into either three of those lines that I mentioned earlier.

[Modified by maxim, 6:33 PM 1/27/2002]

01-24-2002, 09:17 PM	#2
D-SPEED New User Join Date: May 2001 Location: Okayama, Japan Posts: 889	Re: Wastegate vacuumm line question (lbz34) the instructions for my tial WG say to run it from the intake mani before the TB...im just gonna weld a hose barb onto the charge pipe right before the TB. I have a friend who runs every singe vacuum/boost line for his whole setup from one source of the manifold, and his car works fine. Others run off the compressor housing too. To me, it seems most ideal to run off the manifold pre TB. __________________ -89 240sx- SR powered. -04 Kawi ZX-10R -94 GSR -

01-24-2002, 09:24 PM	#3
lbz34 Join Date: Jan 2002 Location: albuquerque, nm, usa Posts: 211	Re: Wastegate vacuumm line question (D-SPEED) Thats how my turbo crx was setup. I didnt ever try it the other way(post TB). Now that i think about it more it would make sense to run it after the TB. reason being the wastegate may see pressure a little later in spool time due to the distance fromt the turbo. Dont really know if this is practical, or if it would help spooling times. also when the throttle is closed, would'nt the wastegate close from the vacuum in the line piped after the TB? __________________ Sean http://www.solid-technology.com

01-25-2002, 04:46 AM	#4
maxim Member Join Date: Jun 2001 Location: Houston, TX, USA Posts: 2,180	Re: Wastegate vacuumm line question (lbz34) You wll loose about 1-2lbs of boost using the port on the compressor, because of the intercooler. There are three other places you can T it into: brake booster line, FPR line, or cruise control line.

01-25-2002, 07:23 AM	#5
Lsos Member Join Date: Oct 2001 Location: Poland Posts: 1,670	Re: Wastegate vacuumm line question (lbz34) I've heard knowledgeable people recommend running it off the compressor due to less chance of spiking. Sure you will lose pressure through the intecooler and such, but you can always make up for that by cranking up the wastegate. __________________ 1989 CRX, B16A.... RIP 12-10-01 1991 CRX DX 2002 S2000

01-25-2002, 07:29 AM	#6
HXMan Member Join Date: May 2001 Location: Midwest Posts: 5,698	Re: Wastegate vacuumm line question (lbz34) Everyone Really needs to get Maximum Boost by Corky Bell! It explains all this stuff. __________________ 94 FD w/LS2

01-25-2002, 07:32 AM	#7
RGAZ New User Join Date: Sep 2001 Location: Bradenton, FL, US of A Posts: 797	Re: Wastegate vacuumm line question (lbz34) I would never run it from the intake after the TB. The boost spikes would be huge when you got off the throttle and the wastegate will respond weirdly when you are at part throttle and cruising. The wastegate should be watching the output of the compressor with nothing interfereing with it. Picture what would happen to the turbo rpm if you had the wastegate line at the TB and the connection at the intercooler popped off. The wastegate would not open and the turbo would spool as fast as it could. Not a good scenario. I use right off the compressor so the feedback loop is as small as possible. Quick response is what you need from a wastegate so the closer to the turbo the better. As for the intercooler, just adjust the wastegate for the extra drop in pressure. Randy __________________ My name is Randy. I am an Engineer. I dance for quarters. I used to dance for nickels, but I got a raise. I sold my turbo CRX cuz I need 4 seats.

01-26-2002, 08:58 PM	#8
lbz34 Join Date: Jan 2002 Location: albuquerque, nm, usa Posts: 211	Re: Wastegate vacuumm line question (RGAZ) you guys have some good feedback. was just a theoretical question. thanks for the intellectual input __________________ Sean http://www.solid-technology.com

01-27-2002, 12:05 PM	#9
Xerxes New User Join Date: Aug 2001 Location: San Jose, CA, 95132 Posts: 620	Re: Wastegate vacuumm line question (lbz34) so likewise, if you have a boost controller, you should tap that in right after the compressor too, right? -Xerxes

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