Wastegate 38mm or 44mm? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

simon240sx · 07-29-2013, 08:34 PM

need to put an external wastegate but I do not know what to put between 38mm and 44mm. I have always had a wastegate actuator. what is the difference between the two? what wastegate you advise? I have a sr20det to 15 lbs of boost with a turbo GT2871R. with the external wastegate I'll get a 20psi.
Thanks!

Pinggg · 07-29-2013, 11:03 PM

38mm will be fine for what you need it for

*fliprayzin240sx* · 07-30-2013, 07:06 AM

Larger wastegate will help with boot creep but considering turbo size, I agree 38mm will do fine. This will all come down to preference.

Personally, I like larger wastegates.

aga · 07-31-2013, 02:18 AM

well, larger wastegates take space and cost money. if you can do your job with a smaller one, do it. generally, you need a big wastegate when you wanna run low boost on a big cc engine. the more boost you run, the less open the wastegate is, so...

the really good thing about an external (when its got a screamer pipe) besides the sound, is that it effectively makes your exhaust bigger

...just by a bit.

07-29-2013, 08:34 PM	#1
simon240sx Join Date: Oct 2008 Location: trois-Rivieres Age: 40 Posts: 49 Trader Rating: (0) Feedback Score: 0 reviews	Wastegate 38mm or 44mm? need to put an external wastegate but I do not know what to put between 38mm and 44mm. I have always had a wastegate actuator. what is the difference between the two? what wastegate you advise? I have a sr20det to 15 lbs of boost with a turbo GT2871R. with the external wastegate I'll get a 20psi. Thanks!

07-30-2013, 07:06 AM	#3
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Larger wastegate will help with boot creep but considering turbo size, I agree 38mm will do fine. This will all come down to preference. Personally, I like larger wastegates. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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07-29-2013, 11:03 PM	#2
Pinggg Zilvia FREAK! Join Date: Dec 2010 Location: Coconut Creek, Florida Age: 28 Posts: 1,255 Trader Rating: (22) Feedback Score: 22 reviews	38mm will be fine for what you need it for

07-31-2013, 02:18 AM	#4
aga Zilvia Junkie Join Date: Mar 2013 Location: Athens, Greece Age: 43 Posts: 580 Trader Rating: (0) Feedback Score: 0 reviews	well, larger wastegates take space and cost money. if you can do your job with a smaller one, do it. generally, you need a big wastegate when you wanna run low boost on a big cc engine. the more boost you run, the less open the wastegate is, so... the really good thing about an external (when its got a screamer pipe) besides the sound, is that it effectively makes your exhaust bigger ...just by a bit.