Joe_Dezod

Internal wastegates do not dump out to the atmosphere if that's what you mean by open. It's released into the o2 housing (exhaust housing) of the turbo.

nester

Unless it's got a divorced housing..

turbo2liter

I believe this is for a DSM, just from a google image search.. you get the idea.

matty-tC

i want pictures of this internal log manifold LMFAO

turbo2liter

I think he meant internally gated turbo, so there are no provisions for a wastegate on the manifold ;)

Still a funny mis-word :D

nester

He means manifold setup for an external gate vs manifold with no external gate mounting point..

matty-tC

yeah i knew what he meant but i wanted him to come up with something LOL

unlimited77

Wait so an external wastegate would yield more then i am def going with an ext wastegate, its a no brainer.

Also another question, Hey maaty tc werent those dyno run sheets from zpi with a stock exhuast system with a different tip?

thanks, cause if thats the case wont a 3 inch custom piping and a muffler yield a slighly or good amount more power?

VIP_tC

the stage 0 dyno was with ZPI s-pipe and a universal muffler. The stage 1 had a dump pipe on it.

NVS_TC

I typed log style internal manifold cause I was trying to think of what kinda manifold it was. I read it somewhere but I didnt know if it was right.

Im guessing that the external would yield more power since it'll allow for better flow. I dont know too much about turbo kit setup so if im wrong then sorry. I just try to recall what i READ.

I also believe ZPI has a axle back and stock mid pipe. That is still better then stock exhaust

nester

It's a universal muffler on the stock pipe..

unlimited77

So are you saying both was 2.5 inch piping?
And if so would a 3 inch make a good difference? Cause i thought i would have to go 3 inch custom exhuast for a stage 1 zpi kit?

thanks

Joe_Dezod

The stage 0 dyno used a stock exhaust setup with aftermarket muffler only. The stage 1 setup used just the downpipe coming off the turbo, but the entire exhaust system disconnected from the turbo. Basically dumping straight down under the motor.

A 3" exhaust will help any turbo-charged application on our engine size. I noticed gains on a 1.7L SOHC Civic at only 7psi, so it should definately help us.

The best turbo exhaust is no exhaust at all. -Not my quote, but I forgot which turbo wiz said that before. A 3" will sound great and still flow very well, without losing too much heat (creating backpressure).

matty-tC

i agree. backpressure is always bad on a forced induction setup.

3" is the sweet spot

turbo2liter

Backpressure is bad on ANY motor, regardless of induction.

Joe_Dezod

True. But if you put a 3" on a non turbo 4 cylinder, say good-bye to low end, and hello to a rediculously loud, annoying, and raspy exhaust.

I do agree that you want as little back pressure as possible.

turbo2liter

A larger exhaust will allow your turbo to spool sooner. The turbo itself providesplenty of resistance in the exhaust stream.

A large exhaust will affect your low end? Your turbo is spooling mid 2000rpm, what low end is there?

matty-tC

yes but you have to tell the ricer kids why not to put a 3" exhaust on their 1.6L NA engine.

if the exhaust gases start to cool and swirl in the oversized exhaust, it increases backpressure significantly. which is why you size your exhaust according to displacement and power goals.

matty-tC

yes but you have to tell the ricer kids why not to put a 3" exhaust on their 1.6L NA engine.

if the exhaust gases start to cool and swirl in the oversized exhaust, it increases backpressure significantly. which is why you size your exhaust according to displacement and power goals.

matty-tC

yes but you have to tell the ricer kids why not to put a 3" exhaust on their 1.6L NA engine.

if the exhaust gases start to cool and swirl in the oversized exhaust, it increases backpressure significantly. which is why you size your exhaust according to displacement and power goals.