redline350ZZ

iTrader: (1)

Whats the Benefits and Con's of venting ur wastegate to the atmosphere????

MIAPLAYA

iTrader: (3)

On higher boosting cars its causes less turbulence in the exhaust tract and provides for more stable and consistent boost response. Turboentics tested running the wastegate to atmosphere on my car during kit testing and saw ZERO improvement in power or response. The only thing that changed in fact was that the car got louder. Hence the reason its plumbed back in on the kit.

theking

iTrader: (3)

Pro- Less back pressure and heat retention=more power.

Con- It's loud.

Peking

iTrader: (2)

Agreed if it is vented back out of the engine compartment completely

Though I will be looking more into the turning around the wastegate and blocking off the other opening to see how loud it really is LOL.

overZealous1

iTrader: (27)

i like loud, lol.

theking

iTrader: (3)

I know on the greddy kit they need to be slightly clocked and extended. You were kidding about the engine compartment, right.

I thought this was a car forum, lol.

MIAPLAYA

iTrader: (3)

The reason he said that is because some people int he past had the wastegate dumping right into the engine bay and melted their wastegate boost signal line. Can you say MAX boost.

Peking

iTrader: (2)

Yeah that is what I was pretty much reffering to, along with it just looks cool to see the wastegate tube coming out from like lets say the side of the bumper or something along those lines. And if there is some fire, watch out

ktown z

iTrader: (8)

Back to the question at hand. Besides MIAPLAYA is there anyone else with personal experience with open vs. closed wastegates? I would like to keep the Z as quiet as possible but if there is horsepower or longevity to be had, then open wastegates for everyone!

redline350ZZ

iTrader: (1)

kewl nice Info....

AParshall04

iTrader: (6)

This is somewhat relevant, i was at an Evo dyno day at gruppe-s in bay area,ca dynoing my Z with my friend who has an Evo, anyway some guy with an STi rolled in running external wastegates, that car was sooo phucking loud everyone had to leave the garage for the sake of keeping their ears. My car is really really loud, but this thing was on a whole different level. He put down something like 375HP too, not too shabby.

Anyway, i wouldn't recommend running one of these if you live in an area where cops just love writing tickets.

overZealous1

iTrader: (27)

oh, did i mention, I LIKE LOUD!!!!! i like to hear the motor workin. i could see it being a prob if you were not running much boost and the wastegates kicked off really soon, but come on, who doesn't want to hear the motor loud when it makes some power!!

imo- this is my opinion!!

i shall be workin on my own atmosphereic wastegates when the exhaust is built.

Sharif@Forged

iTrader: (92)

The dump is going to be nasty loud. I think the real benifit is doing a larger diameter 3 inch downpipe....rather than doing an open dump. The 3 inch downpipe will reduce exhuast gas backpressure, and the open dump would add to that....but it might be too loud for all but the most aggressive individuals. You can expect 20-40whp gains on the 15psi'ish cars running twins. Keeping in mind that much of the gain is coming from the upgrade to a 3 inch downpipe, vs. the stock Greddy 2.25-2.5inch downpipe.

Since you have a TN kit, I dont think there is a benifit to doing open dumps at 10psi'ish, since the TN downpipe is already 3 inch.

Ec2k1gt

iTrader: (10)

Haha Sharif is right, I ran open wastegate on a previous car and it was crazy loud, its funny pulling up to people dumping it into 2nd and just watching there reaction as the sound coming from the wastegate scares the crap out of them

-Vic

nissansource

iTrader: (10)

open wastegate is terrible for listening to a motor. Its nice and all but *** sometimes id like to hear the motor if it was pinging

Sharif@Forged

iTrader: (92)

+1 very true.

t32gzz

iTrader: (1)

I am running it and making ~35 more whp than other Z's with the exact same set up. I actually did it for the sound. I run the HKS Knock Amp to monitor knock so I am not worried. On a Greddy kit, it will make power. So will a 3" exhaust.

If you like your car to sound mean.... this will do it!

nissansource

iTrader: (10)

i heard something funny couple years back. People putting motorcycle exhausts or goped exhausts on the wastegate makes it sound like it has some sort of vvl sound cam adjustment on WOT