turbo

ok...if i wanted to get a turbo on a 4 gen then what exactly would i need? as in like...intake header exhaust...that stuff...cuz i thought i was well off until i read some of these posts that say like your exhaust has to be the biggest diameter for turbo and dont buy headers for a turboed engine...so im confused.....


help?

you don't need headers if you're going turbo....and if you think you're going to go with more boost, i'd suggest you build your engine with stronger internals before getting the turbo or you will definitely end up blowing something. boost is normally set at what your stock engine can handle, but if you're going for more, your engine has to be stronger to handle it. new pistons, camshafts, cam gears, valve springs, blah blah blah....

for a complete turbo system you need at least:

turbocharger with proper AR ratios to prevent backpressure yet still provide boost with minimal lag.

wastegate, whether internal or external.

turbine manifold with proper flange to mate the turbocharger and/or external wastegate.

Rising rate fuel pressure regulator or larger injectors with a 1:1 fuel pressure regulator and a MAP sensor bypass valve. if you go with a standalone programmable ecu, you can bypass all of this except for the injectors.

downpipe for turbine exhaust

cone filter for turbine intake

blow off/bypass valve

boost gauge to help you set boost accurately.


for exhaust, you dont need a large bore exhaust pipe for low boost situations. the larger pipe helps evacuate the exhaust gas more efficiently, allowing the turbine to spin up more quickly due to zero backpressure. also realise that there is a problem with going too big, by the means of boost spiking and overboost. 2.5" to 3" is best.

thanks....next question tho....how many intakes you need for a single turbo...? kinda obvious...but one right? or no....

wait....i still dont understand why no headers...sorry i kinda just upgraded from the normal IHE way of thinking. and turbo is totally uncharted territory for me....all i know is that turbo is good. haha so then what would happen if you already had headers? like what would it do to the engine or performance --whats the effect?

turbo has it's own exh manifold that takes the place of the header. that's why. find some pics of a turbo car, look at the turbo, then look at a car with a header. they sit in the same spot right?

Ok, let's see if I can help clear that up for you a bit as simple as possible.


Exhaust gases are passed through the header.
A turbo is driven off of exhaust gases.
In order for the exhaust gases to be routed through the turbo, you need a special type of header, nothing that DC or the likes make.

So whatever header you have on your car now will be in the junk pile when you're done w/the turbo.