Changing Wastegate

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Apr 20, 2005 | 08:26 PM

#16

cooter

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From: Tennessee

Quote:

Originally Posted by shiv@vishnu

Yep! But only on full boost

Lot of "tuners" recommend that because it's cheaper than properly reintroducing it back in the downpipe (with a slip or a flex joint). They insist it performs better too. It doesn't.

All it does is attract a lot of attention, burns your underbody coating and smells like crap.

shiv

But it sounds cool, and blows the eardrums off the car next to you....WSSSSHHHHHHHHHHH

Apr 20, 2005 | 08:39 PM

#17

alex_alex

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From: Los Angeles

Quote:

Originally Posted by shiv@vishnu

Yep! But only on full boost

So if you were, say . . . running the stock turbo on race gas, presumably to its max, will exhaust gas ever come out of the wastegate?

Apr 20, 2005 | 09:13 PM

#18

Wrench

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From: WC

Quote:

Originally Posted by shiv@vishnu

Yep! But only on full boost

Apr 20, 2005 | 09:47 PM

#19

Kimbo63

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Quote:

Originally Posted by alex_alex

So if you were, say . . . running the stock turbo on race gas, presumably to its max, will exhaust gas ever come out of the wastegate?

The only times these turbos max out, is at high rpm. You're never going to ask for everything it's got at, say 4000rpm. That's a lot of hot air/boost

shiv

Apr 20, 2005 | 11:12 PM

#20

alex_alex

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From: Los Angeles

Quote:

Originally Posted by Kimbo63

The only times these turbos max out, is at high rpm. You're never going to ask for everything it's got at, say 4000rpm. That's a lot of hot air/boost

shiv

(maybe im not understanding this correctly) . . . but when they arent maxed out, the wastegate has no need to open right?

Apr 21, 2005 | 05:10 AM

#21

Dyno4mance

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From: NW Georgia

Quote:

All it does is attract a lot of attention, burns your underbody coating and smells like crap.

.....and burns the powdercoated finish on the dyno.......darn ricers

Apr 21, 2005 | 05:46 AM

#22

Az3ar

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From: none

Quote:

Originally Posted by alex_alex

So if you were, say . . . running the stock turbo on race gas, presumably to its max, will exhaust gas ever come out of the wastegate?

The EXT WG will always open on mid~high RPM while shifting between gears.

Think about it, where is all this extra air is going to go after letting off the gas to shift? At that point there is vacuum. BTW I am talking about the air that is exiting the engine going to the turbo not the air that is in the pipes. That’s why turbo loose spool while shifting (no more air). The air escapes through the WG (not much but depending on RPM and engine size). Hence Anti lag system for older EVOs.

Apr 21, 2005 | 07:45 AM

#23

Ludikraut

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From: 41° 59' N, 87° 54' W

Quote:

Originally Posted by shiv@vishnu

That's because it's a terrible example of wastegate integration... yikes. The best option would be to get a higher sprung actuator. But that's only if your goal is to hold more boost to redline and run that turbo into portions of its turbine map that its not designed to run in in backpressure conditions that are painful to even think about (that's what is cracking the flapper door open afterall).

Shiv

If I'm reading the compressor map right (TD05HR-16G6), it would be nice to be able to hold a little bit more boost to redline ... somewhere along the line of 20-21psi at 7500rpms, no?

On a separate, but related note - Shiv, do you know the VE of a stock 4G63? Does anyone know how to measure and calculate it?

l8r)