Which external wastegate?

gripo · #1 02-03-2010, 17:34

The T3 with custom exhaust manifold is going on. Which external wastegate shall I get? Jon wants one on that has atleast 1 bar of spring rate. He has recommended this one but we want to know what you think. If you know of a better one post up and let me know

http://cgi.ebay.co.uk/38MM-Turbo-Ext...item3caa9d77c6

s13eater · #2 02-03-2010, 17:52

that looks good enough mate, i used a cheap xs power wastegate on my blue beastie, i'am using twin tial on the fj, but they are £230 plus each

gripo · #3 02-03-2010, 17:56

was yours loud mate? I am a bit worried about the noise as it will be a daily drive. I am assuming it only 'whoooshes' when you put your foot down? Am I right or not?

s13eater · #4 02-03-2010, 19:13

don't be

, they are not over load, they don't come on until on near enough full boost.they sound

, you will love it.

CNHSS1 · #5 02-03-2010, 19:52

i had an ebay cheapie too Gripo, was fine. Only problem was i ran a screamer pipe and it used to 'chuff' at idle, didnt seat perfectly until about 1200rpm. Sounded good at full throttle.
if i ran one again, i would run the ext wastegate exh pipe back into the main pipe after about a metre from the turbo. does stop the noise a fair bit and stops the scrutineers asking why i have two exhaust pipes at scrutineering

from what i know, the sizing and spring pressure is based on two things, amount of gas flow and what boost solenoid you are going to use.
if you have a small to medium flow turbo, then a 60mm ext WG would be overkill as soon as it opened it would bleed off a huge amount of gas and actually cause an erratic boost curve. ideally a 38mm-45mm is fine on most turbos imho.
With the spring, go for a spring rated at the minimum amount of boost you are going to run, then youre boost solenoid will bleed off enough to give you 'overboost' ie spring at 14psi, with boost solenoid closed, then say 20psi with it open.
I had a problem with my boost solenoid on mine. with the boost solenoid fully open i could only get 12psi, so i guess the spring was about 7psi. i changed the boost solenoid to a 225 Audi TT version and that helped, allowing 15-16psi max.

hope that helps mate
CNH

s13eater · #6 02-03-2010, 20:01

i know of a skyline that lost 70bhp from piping the screamer pipe back in, probably piped in to close to the turbo, i'd keep it external, it sounds awsome.

PukkaSilvia · #7 02-03-2010, 20:30

good to see some other views. I used the exact same external wastegate as you shaun before, But i couldnt seem to find them anymore on ebay.

I like the build of that one in ebay and it looks to come with good gaskets etc....

I ran my wastegate external with no sreamer pipe going to atmosphere and mine seated fine everytime at idle. I used a 1 bar internal spring and for a while used no additional controller with it. It was a very stable boost pressure.
Gripo has a greddy electronic controller.
Will have to see where his wastegate outlet sits and go from there.

I want to fit an external wastegate to my evo at some point soon. Im just unsure on what manifold to go for.

PukkaSilvia · #8 02-03-2010, 20:32

by the way it only is loud while on full boost as that is where the wastegate begins to blead your exhaust gasses away to modulate your peak boost. And then obviously it chatters at the same point that your dump valve would. Its great

s13eater · #9 02-03-2010, 21:33

Quote:

Originally Posted by Pukka

i want to fit an external wastegate to my evo at some point soon. Im just unsure on what manifold to go for.

you could go for anything, but if you was going for serious tuning, then you would need runner lenghts to suite your your cams / rev range.

PukkaSilvia · #10 02-03-2010, 21:37

nah im not really going into anything too serious. I want to get some savings together for incase i go travelling at some point one day.