Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Forced Induction Discuss topics relating to turbochargers, superchargers, and nitrous oxide systems. |
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
06-18-2004, 11:19 AM | #1 | |
AF Regular
|
wastegate question
i'm looking at gettin a big 16g turbo and wanted to know if there is any performance gain or spool up difference between the internal and external wastegates. thanks guys!!!
|
|
06-18-2004, 11:28 AM | #2 | |
AF Enthusiast
|
Re: wastegate question
my frined was telling be that an external wastegate is better and it makes the car more responsive but thats what i herad i not sure if its true or not..
__________________
Shift_BOOST 97 s14 |
|
06-18-2004, 11:41 AM | #3 | |
AF Enthusiast
Join Date: May 2004
Location: Mississauga
Posts: 984
Thanks: 0
Thanked 0 Times in 0 Posts
|
I believe the external wastegate is better...best to ask Redneck or flywsi...they'd know!
__________________
Mine's an '82 Pontiac Parisienne 4-door sedan!! - 305 cu inch (5.0L) small block V8 w/ 3spd auto - 4 barrel carb w/ single exhaust - No catalytic converter, no posi-trac NEVER LOSE FAITH IN THE BOAT!! |
|
06-18-2004, 12:12 PM | #4 | ||
AF Enthusiast
|
Re: wastegate question
external wasgates, i think they get better adjustment
__________________
Quote:
CHECK OUT MY CARS HERE! drag1320neon and 209neon's babys < 209 neon finished!> |
||
06-18-2004, 12:21 PM | #5 | |
AF Enthusiast
|
[quote]What's the difference between internal and external wastegates?
Internal wastegates are comprised of a flapper door which is built in the turbine housing, usually operated pneumatically by a mechanical actuator. These flapper doors are limited in size, but work well in certain applications. Usually found in smaller turbos, internal wastegates are relatively inexpensive, simple in design, and very durable. Larger turbo can be fitted with internal wastegates, but boost control can be tricky. If you are looking to run high boost (20+ psi) all the time, then an internal gate may be fine. If you are looking to run lower boost levels, you will need an external wastegate. External wastegates are generally mounted to the exhaust manifold or to the O2 housing, and are self contained units. External wastegates have the ability to bypass large amounts of air, and can provide steady boost control at any pressure level. A common myth is that in order to run higher boost pressures, you need a larger wastegate. This is incorrect. Larger wastegates are necessary to run low boost levels on large turbos thats from http://www.forcedperformance.net/faq.aspx 1
__________________
Shift_BOOST 97 s14 |
|
06-18-2004, 02:03 PM | #6 | |
AF - Advisor
Join Date: Mar 2003
Location: Philly, Pennsylvania
Posts: 3,133
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: wastegate question
turbo2nr, good post.
The benefit of the external WG is control ... specifically at lower boost levels. If you have a big turbo, but want to run low boost on the street ... you need the external gate.
__________________
Sponsorship: Amateur Motorsports <-- Get the book! - books are now available for shipment |
|
06-18-2004, 03:55 PM | #7 | |
The Red Baron
|
We do have a forced induction forum. Even though there have already been some great responses I think you'll get even more there.
|
|
06-19-2004, 04:29 AM | #8 | |
AF Enthusiast
Join Date: Mar 2003
Location: Whiterock
Posts: 1,243
Thanks: 0
Thanked 0 Times in 0 Posts
|
It isn't necessarily the boost level that necessitates an external wastegate, but the volume of exhaust. If the exhaust gas volume is larger than the internal wastegate can properly vent, you will overboost. The problem lies in the fact that since an internal wastegate must be placed in the turbine housing, space is an issue so internal wastegates tend to be small, and can in some cases be inadequate. Other benifits of external wastegates are a separate passage for wasted exhaust eliminating disruption to the main exhaust, and generally better placement of the wastegate. However, if you can get by with an internal wastegate, I would recommend it since an external one would just be an added hassle and expense. Don't buy an external wastegate just because they are better unless you have money to blow, don't get me wrong they are better but unless you NEED one I wouldn't bother.
__________________
Beer tastes better upside down. Last edited by Sluttypatton on 13-54-2098 at 25:75 PM. |
|
06-19-2004, 05:46 AM | #9 | ||
AF - Advisor
Join Date: Mar 2003
Location: Philly, Pennsylvania
Posts: 3,133
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: Wastegate question?
Quote:
__________________
Sponsorship: Amateur Motorsports <-- Get the book! - books are now available for shipment |
||
06-20-2004, 05:14 PM | #10 | |
AF Enthusiast
Join Date: Nov 2001
Location: Borlänge
Posts: 1,098
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: Wastegate question?
The biggest drawback from the internal wastegate is probably it's placement and that the outflow disturb the utflow from the turbine.
Larger turbochargers are usually made for diesels and their internal wastegates are usually not large enough to do the job on a gasoline engine if low boost pressures are wanted. Smaller turbochargers should have no problem with their internal wastegates if they are used properly. |
|
|
POST REPLY TO THIS THREAD |
|
|