What are these holes in the compressor for?
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Joined: Jul 2002
Posts: 576
From: orangeville ontario canada
what happens if you let off the gas? the wastegate closes instanly? even if it should still reamin open for a bit?
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Joined: Apr 2002
Posts: 2,154
From: All around
The pressure line is there to limit the maximum boost at throttle by opening the wastegate above a certain pressure.
Registered User
Joined: Jul 2002
Posts: 576
From: orangeville ontario canada
i understand how a wastegate works.. i don't understand why you would want to hook it up differently than both major manufactures suggest. look at tial's instructions. before throttle body. look at turbosmarts instructions. before throttle body. jgs before throttle body.
i am interested in the reasoning in hooking it up after the throttle body.
i am interested in the reasoning in hooking it up after the throttle body.
Last edited by akafred; May 22, 2008 at 07:31 PM.
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Joined: Jul 2002
Posts: 576
From: orangeville ontario canada
to be honest i have no idea.. i think at 416 rwhp with the high compression it was to much for the ****ty cast crank to handle. i drove home the night before had the car sideways a couple times. it ran like a champ.. went to start it the next morning, crank crank bang... took the engine apart and the crank came out in 3 pieces.. ruined the block, ruined one of the rods. car has now sat for 3 years.. it may also have been a defective crank. you could see where it broke it looked like it was partially broken for a while before it let go. should be running again any time now with twin turbos and a forged crank..
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Joined: Apr 2005
Posts: 431
From: NYC
i think i know what your trying to say.. You want to reference the boost still left in the charge pipes to keep the wastegate open a little longer. One problem, if you are running a bov or a diverter the pressure in the charge pipes drop as soon as the throttle is shut so that you dont surge the compressor wheel.
6 in one half a dozen in the other
as long as the boost reference is close to the intake port it dosent matter before or after the tb. intake manifold gives a more steady feed to the wastegate thats why most people run them there.
6 in one half a dozen in the other
as long as the boost reference is close to the intake port it dosent matter before or after the tb. intake manifold gives a more steady feed to the wastegate thats why most people run them there.
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Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Registered User
Joined: Jul 2002
Posts: 576
From: orangeville ontario canada
i am going to run mine right off the compressor. i am hoping that with my 7psi spring and the pressure drop from all my tubing and intercooler it will see 7psi or less at the throttle body.
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Joined: Jul 2002
Posts: 576
From: orangeville ontario canada
thats not really my point.. my point is that all the wastegate installation instructions tell you to reference before the throttle body.. there has to be a reason... maybe they are all wrong.. ???
i am guessing that they do that because the wastegate reaction time would be quicker if referenced right at the compressor.
i am guessing that they do that because the wastegate reaction time would be quicker if referenced right at the compressor.
i think i know what your trying to say.. You want to reference the boost still left in the charge pipes to keep the wastegate open a little longer. One problem, if you are running a bov or a diverter the pressure in the charge pipes drop as soon as the throttle is shut so that you dont surge the compressor wheel.
6 in one half a dozen in the other
as long as the boost reference is close to the intake port it dosent matter before or after the tb. intake manifold gives a more steady feed to the wastegate thats why most people run them there.
6 in one half a dozen in the other
as long as the boost reference is close to the intake port it dosent matter before or after the tb. intake manifold gives a more steady feed to the wastegate thats why most people run them there.
Last edited by akafred; May 24, 2008 at 05:53 PM.
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Joined: Feb 2007
Posts: 322
From: mechanicville n/y
if your runnin a intercooler its smart to run at manifold for the reference point as ya get a real boost reference when i first started runin mine i had it hooked to the port in the outlet of the turboi was only gettin 13 lbs of boost so i moved it to the manifold and i got the 15 i was lookin for ya goota think the cooler and piping takes away at least a lb of boost after all said and done
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Joined: Mar 2001
Posts: 2,667
From: SLC, UT
if your runnin a intercooler its smart to run at manifold for the reference point as ya get a real boost reference when i first started runin mine i had it hooked to the port in the outlet of the turboi was only gettin 13 lbs of boost so i moved it to the manifold and i got the 15 i was lookin for ya goota think the cooler and piping takes away at least a lb of boost after all said and done