which wastegate do i use?
cool man 
Honda-Tech Member
Joined: Nov 2002
Posts: 17,227
Likes: 2
From: Illinois
Re: which wastegate do i use? (VTEC_PRODUCTION)
38mm should be fine if your running high boost, depending on how much power you're making though. The bigger wastegates are good to control low boost.
Modified by RCautoworks at 2:20 PM 9/16/2007
Modified by RCautoworks at 2:20 PM 9/16/2007
Honda-Tech Member
Joined: Apr 2003
Posts: 885
Likes: 0
From: Bitburg Germany
Re: which wastegate do i use? (RC000E)
Dont waste your time or money . Go with a 44mm or 50mm off the bat. Dont get me wrong , you can make a 38mm work but wg placement becomes more important . I'm running a 38mm right now up to around 23 psi but a bigger wg would work better for my application.
Thread Starter
Honda-Tech Member
Joined: Dec 2006
Posts: 2,198
Likes: 0
Re: which wastegate do i use? (RC000E)
50 mm???<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RC000E »</TD></TR><TR><TD CLASS="quote">Try out the Synapse man....</TD></TR></TABLE>
Trending Topics
Honda-Tech Member
Joined: Jul 2004
Posts: 5,463
Likes: 2
From: I'm everywhere Focker
Re: which wastegate do i use? (VTEC_PRODUCTION)
You should add "or blown out" to your sig line VTEC_PRODUCTION.....hahahaa
hot and stick and blown out....LOL....
Ahhh I'm tired....
hot and stick and blown out....LOL....
Ahhh I'm tired....
Honda-Tech Member
Joined: Feb 2007
Posts: 208
Likes: 0
From: Garage, FL, USA
Re: (Schister66)
so what is there to know about knowing which size to get for ur build? cuz im in the look out for buying a wastegate for my kit aswell and i can easily just listen to some one (not saying ur wrong) and buy it but id like to know how u came up with that decision... cuz i plan on looking at around 500 hp... some one said smaller wg for high psi? and bigger wg for low psi?
Mr. Badwrench
Joined: May 2002
Posts: 14,146
Likes: 2
From: stranger in a strange land
Re: (SiR Koopa)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiR Koopa »</TD></TR><TR><TD CLASS="quote">what do u mean by placement ( sorry new to turbo) and as far as the flange im having the manifold made to my specs so either or it can be fitted for</TD></TR></TABLE>
where the gate is. like is it pulling from all 4 ports, or one like a grag manifold?
where the gate is. like is it pulling from all 4 ports, or one like a grag manifold?
Joined: Oct 2007
Posts: 17
Likes: 0
From: northeastern, ct
Re: (SiR Koopa)
if it hasnt be said yet ill break it down for you or maybe others. typically if you have a big turbo that can flow lots of air and you are running little boost you would want a bigger wastegate. if in the above mentioned case you went with to small a wastegate you couldnt regulate boost fast enough and youd get boost creep.
Joined: Apr 2007
Posts: 11
Likes: 0
From: Albuquerque, NM, USA
Re: (s52b32)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">I have found a common misconception among sizing of wastgate for horsepower goals. Here are my thoughts:
The wastegate sizing is largely dependent upon the boost pressure being regulated, and the exhaust energy from the engine the wastegate is being used upon. The way in which a wastegate works is to regulate the amount of exhaust energy, or exhaust gas that travels into the turbine housing of the turbocharger. At lower boost levels, more exhaust gas is being bypassed to sustain the lower pressure. The reason is that to keep the exhaust flow that goes into the turbine housing to a lower pressure, more exhaust energy is to be bleed from the exhaust manifold. So at lower boost pressures, the size of the wastegate becomes critical in order to regulate the amount of exhaust energy that travels into the turbine housing. The physical size of the wastegate should be larger, or have a larger diaphram and valve to bleed off the most amount of pressure. As higher and higher boost pressure are enabled, less exhaust energy is to be bleed from the system. The wastegate valve is opened less and less, so the physical size of the wastegate (i.e wastegate valve size; ex. 35mm is 35mm valve, etc) being used is to be smaller and smaller.
Besides the amount of boost pressure being regulated, the compression and displacement play a huge role in the amount of exhaust energy available in the exhaust manifold. The greater the displacement and compression, the larger the wastegate size should be used. Its a very simple relationship between boost pressure, displacement and compression ratio of the engine the wastegate is being used upon. A side note, the larger wastegate typically holds boost pressure more stable than the smaller wastegate size. Most, if not all cases of unstable boost is created from poor wastegate placement. If wastegate placement is pre-dictated from the manufactuer, and unstable boost is a problem a larger wastegate should be employed. The Tial 35/38mm wastegate is sufficient for 500-600whp level, which is contradictory to what most turbo Honda's use at higher boost levels.</TD></TR></TABLE>
The wastegate sizing is largely dependent upon the boost pressure being regulated, and the exhaust energy from the engine the wastegate is being used upon. The way in which a wastegate works is to regulate the amount of exhaust energy, or exhaust gas that travels into the turbine housing of the turbocharger. At lower boost levels, more exhaust gas is being bypassed to sustain the lower pressure. The reason is that to keep the exhaust flow that goes into the turbine housing to a lower pressure, more exhaust energy is to be bleed from the exhaust manifold. So at lower boost pressures, the size of the wastegate becomes critical in order to regulate the amount of exhaust energy that travels into the turbine housing. The physical size of the wastegate should be larger, or have a larger diaphram and valve to bleed off the most amount of pressure. As higher and higher boost pressure are enabled, less exhaust energy is to be bleed from the system. The wastegate valve is opened less and less, so the physical size of the wastegate (i.e wastegate valve size; ex. 35mm is 35mm valve, etc) being used is to be smaller and smaller.
Besides the amount of boost pressure being regulated, the compression and displacement play a huge role in the amount of exhaust energy available in the exhaust manifold. The greater the displacement and compression, the larger the wastegate size should be used. Its a very simple relationship between boost pressure, displacement and compression ratio of the engine the wastegate is being used upon. A side note, the larger wastegate typically holds boost pressure more stable than the smaller wastegate size. Most, if not all cases of unstable boost is created from poor wastegate placement. If wastegate placement is pre-dictated from the manufactuer, and unstable boost is a problem a larger wastegate should be employed. The Tial 35/38mm wastegate is sufficient for 500-600whp level, which is contradictory to what most turbo Honda's use at higher boost levels.</TD></TR></TABLE>
Thread
Thread Starter
Forum
Replies
Last Post