I have been reading most of you guyz turbo builds and was still somewhat confused on a couple things....So when going turbo I can choose whether to have internal or external wastegates... so if i get the RRM turbo mani then I have to put a external wastegate on it or can i buy something that bolts over this hole or do I have to weld it shut??? Also, can I just use the stock evo 8 o2 housing or do I have to get one like the RRM one that has the pipe coming out of the top? what is that for?

 

you can basically do whatever your want here are your options

manifolds
buy one from speed corps with out the external wastegate

buy one from rrm with the external wastegate - either way you can seal up the hole or buy the wastegate

you can reuse the stock O2 housing fomr the evo 8 but most people buy the cheap megan racing because it does the same thing and it looks better

depends on the turbo you buy that will allow you to use an internal or external wastegate

the stock evo 8 turbo which most people end up using has an internal wastegate, all you have to do is buy a forge wastegate with a 5-10 pound spring

 

on the rrm one the pipe going up the top is for the other part of the return for the external gate that you could use. it all depends on what you want. you can always block it off. i actuallly got all mine for sale if yur interested.

and also seeing that you have an 05 you will have to go the rrm route if you turbo because of the salve cylinder....

josh

 

Alright so I have to get the RRM manifold but I can still choose to go with the internal wastegate right?

 

Using the RRM mani also means that I have to use the RRM o2 housing and can't use the stock evo one?

 

I have this battery solution I built a tray myself it will be outta the way right?

 

yes you can still go internal gate but to use the evo piping then you would have to rotate the coldside of the turbo to mount up, thus in turn not being able to use the internal gate. now it you leave the coldside where it is you will have to use/fab a j-pipe from a dsm/eclipse and possibly a licp as well to mount up.

yes this is true and also the turbine and w/g flappers of the turbo's are opposite plus designed different

yes that will clear any evo intake from the turbo



josh

 

I was also wondering if I get the RRM setup and the mishimoto zline intercooler then can i still use stock evo piping?? or will i have to get a custom kit put together?

 

yes it willl work. the ic's are universal, but you can prolly get a used evo one for cheaper and obviously it then will also work with teh factory piping.

 

well it said in ozreefs turbo build that u would have to remove the crash bar and that's not somethin i want to do. and im looking for more of a sleeper looking black one.

 

well yes this is tru and i forgot about that....


josh

 

where does the recirculating hose go to? And I have read so many times about different ways of setting up the oil feed. Some are talking about T-ing into things and others pull lines off the intake?? What is the best solution?

 

Well...I think you're merging ideas here.

Turbo needs oil, you can get it from the bolt just above the oil filter, you can get it from using a sandwich adaptor that bolts up where the oil filter would screw in, and then the oil filter screws into the sandwich instead, what you need is a pressurized source of oil to keep the bearings cool.

Also, the turbo probably runs better with some "coolant" running through it, which people are "t-ing" into the throttle body coolant lines. I don't advocate T'ing anything with the coolant system, just take one hose off anywhere, and run it to the turbo, then run the other coolant line on the turbo back to where you stole the previous line. The coolant system has water/antifreeze mix running through it, and you just want to add one more device to the "daisy chain" if you will. T'ing sort of adds this extra pathway into the system, and it's not suppose to have that...linearity is key.

recirculating is probably for the blow off valve or diverter valve. When pressure builds up after the turbo, it's called boost obviously...the key to this whole process. As boost is building, the car is accelerating and the throttle body is open. Well, when you let off the gas, the throttle body closes, so all that compressed air trys to turn around and go back from whence it came. Well, the diverter valve is there to stop this, by taking pressure(ie all that air that's compressed) and dumping it back into the intake system BEFORE the turbo, so that the pressure is evened out on both sides of the turbo. If you don't do this, or it isn't done properly, you'll get something called "compressor surge" which makes a sound similar to your turbo, like...running underwater or something. Google it and find a video of compressor surge, but it's a bad thing and it wears a turbo much faster necessary, because the fins are changing direction rapidly and under quite a bit of stress.

As far as where recirculation hoses go, there is a diverter valve (or bov if you must) in the middle of the hose. One side connects to the intake before the throttle body but after the turbo and the other side of the hose connects to the intake tube after the maf but before the turbo.

 

the recirc hose goes from the bov on the intake back to the upper pipe. since the bov is post maf that maf has already calculated for the air coming in so if the blow off from the bov is not recirculated then it causes a "rich" situation at that time and point. as for the oil feed there is an 8mm (or 6 i cant remember) plug just above where the oil filter sits. thats where i had mine but some use it off an oil block adapter for other things as well such as oil temp and pressure.


josh

 

ah i see. yeah i got confused on the whole coolant and oil thing thanks for clearing that up!And i get the whole recirc thing now thanks.